Paper sizing additive, methods of producing and using said additives

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing an alkenyl-substituted cyclic anhydride, comprising the following steps: isomerising one or more olefinically unsaturated C6-C28 hydrocarbons, from which at least 30 wt % is alpha-olefin, by contacting said hydrocarbons with a catalyst which contains an alkali metal on a support, and reacting the formed isomerised C6-C28 olefin hydrocarbons with a cyclic anhydride of an unsaturated dicarboxylic acid to form an alkenyl-substituted cyclic anhydride.

EFFECT: invention relates to use of said compound as a paper sizing additive and a method of producing said additive based on the obtained alkenyl-substituted cyclic anhydride.

20 cl, 2 tbl, 4 ex

 

The present invention relates to new additives for paper sizing, getting alkenyl-substituted cyclic anhydrides by isomerization of alpha-olefins and subsequent interaction with a cyclic anhydride of an unsaturated dicarboxylic acid, and the use of these additives in the production of paper and cardboard. In addition, the present invention relates to obtain a sizing agent for paper of the cyclic anhydride of an unsaturated dicarboxylic acid and internal olefins, isomerized using a catalyst based on an alkali metal.

Alkenyl-substituted cyclic anhydrides are widely used in paper industry as an additive for paper sizing, designed to improve the properties of paper, including bond paper, recycled linerboard and drywall. Alkeneamine connection succinic anhydride (ASA) are often used alkenyl-substituted cyclic anhydrides. ASA-compounds contain reactive functional groups that are believed to covalently bind with cellulose fibers and the hydrophobic tails are oriented from the fibers. The nature and orientation of such hydrophobic tails cause the fibers to repel water. Commercial sizing agents based on ASA-connect the developments, usually derived from maleic anhydride and one or more corresponding alpha - and/or internal olefins, for example, C16- internal olefins and/or C18- internal olefins.

Internal olefins, usually derived from linear alpha-olefins by isomerization of the double bond of the olefin from the end position in the internal. Linear alpha-olefins have the structure shown in figure 1:

where R is an aliphatic hydrocarbon group.

However, almost pure linear alpha-olefins from the corresponding chain length required for ASA compounds are quite rare on the market and are relatively expensive. In fact, a significant portion of the existing market alpha-olefin has the structure shown in figure 2:

with R1and R2groups that represent aliphatic hydrocarbon groups, so-called, vinylidene olefins. The content of vinylidene and the degree of branching of the alpha-olefins are highly dependent on the methods of oligomerization of ethylene by various suppliers alpha-olefins. Such methods of obtaining differ significantly from each other (see, for example, Industrial Organic Chemicals: Starting Materials and Intermediates, Wiley-VCH Verlag GmbH, 1999, Volume 5, Chapter 2.1 entitled Monoolefins, pages 2870-2873).

Usually, mixtures of alpha-olefins, the soda is official at least 10 mass % vinylidene olefins, more readily available (these mixtures can, for example, be obtained from Ineos and Nizhnekamskneftekhim)are inexpensive and readily available as a raw material than almost pure linear alpha-olefins. Largely the reason that large number of available linear alpha-olefins are supplied in ASA-industry either directly from the stage of polymerization or after. Therefore, economically viable, would be the possibility of obtaining alkenyl-substituted compounds with cyclic anhydrides with a good performance, acceptable as an additive to the paper, based on alpha-olefins, including a significant number vinylidene olefins.

US 6231659 describes alkeneamine succinic anhydrides for use as agents for paper sizing, which is a mixture of alkenyl succinic anhydrides in which alkeneamine groups contain approximately in the range from 6 to 40 hydrogen atoms and in which at least 97 wt.% alkenyl groups are branched on the alpha carbon atom into two branches, none of which has no less than two carbon atoms. Such alkeneamine succinic anhydrides derived from maleic anhydride and consist of linear or substantially linear internal olefins, or consist of linear or there is TSS linear olefins in the mixture with vinylidene olefins. These anhydrides are also produced by isomerization of the corresponding alpha-olefins using PENTACARBONYL iron as a catalyst.

The disadvantages of such a homogeneous method consist in the fact that the stage of isomerization can be performed only at relatively high temperatures, and that the resulting olefins must be purified by distillation to remove unwanted residues of the catalyst and color (caused by the catalyst and the decomposition products of the catalyst) before implementation of the interaction of these olefins with maleic anhydride with the formation of the ASA connections. In addition, performance ASA compounds based on alpha-olefins, including vinylidene olefins, samaritani using PENTACARBONYL iron as a catalyst, when used as agents for paper sizing, significantly lower than when using ASA compounds based on isomerized linear alpha-olefins.

The objective of the invention is to develop an improved method of obtaining alkenyl-substituted compounds with cyclic anhydrides. In addition, the objective of the invention is to develop a method of obtaining alkenyl-substituted compounds with cyclic anhydrides, where as starting substances can be used alpha-olefins with regard the sustained fashion high percentage vinylidene isomers and where obtained alkenyl-substituted compounds of cyclic anhydrides should be acceptable to obtain good performance characteristics in the sizing of paper.

This is accomplished by creating a method of obtaining alkenyl-substituted compounds of cyclic anhydride according to the invention, which involves the following stages:

(i) the implementation stage of isomerization of the double bond of one or more alafinova-unsaturated C6-C28hydrocarbons of which at least 30 mass % of alpha-olefin by contacting these hydrocarbons with a catalyst comprising an alkaline metal on the carrier, and

(ii) the interaction of the resulting isomerized olefinic C6-C28-hydrocarbons with a cyclic anhydride of an unsaturated dicarboxylic acid with the formation of alkenyl-substituted compounds of cyclic anhydride.

Compounds that can be used as the starting material in the method according to the present invention, are alafinova-unsaturated hydrocarbons with chain length from 6 to 28 carbon atoms. Alafinova unsaturated hydrocarbons may also be a mixture of C6-C28- alafinova unsaturated hydrocarbons. Preferably, use C16-C24- alafinova unsaturated hydrocarbons or mixtures of these hydrocarbons. Most preferably, the application relates to C16or C18- alafinova unsaturated hydrocarbons, or mixtures alafinova-unsaturated C16 and C18- hydrocarbons.

At least 30 mass % of these alafinova unsaturated hydrocarbons comprise alpha-olefins. Preferably, at least 50%, more preferably at least 75%, more preferably at least 90% and most preferably at least 95 mass % of these alafinova unsaturated hydrocarbons comprise alpha-olefins. Advantages of the method according to this invention is that the resulting olefin is not necessary to purify by distillation prior to engagement with a cyclic anhydride of an unsaturated dicarboxylic acid such as maleic anhydride, with the formation of alkenyl-substituted compounds of cyclic anhydride, since there is significantly less staining or even staining is absent when using a heterogeneous catalyst according to this invention as compared with previously described methods known from the prior art where the use of a homogeneous catalyst. In addition, in contrast to the well-known acid catalyzed isomerization, where rearrangement of the carbon skeleton, leading to a significant branching, the branching absent when using the method according to this invention. Preferably, at least 15%, preferably, on ENISA least 25% and, most preferably, at least 35 mass % of these alpha-olefins are vinylidene isomers.

The catalyst used in the method according to this invention include alkali metal on a carrier, and the way to obtain this catalyst is described, for example, in GB 1416317, GB 1492059, US 2952719 and US 3897509. Alkaline metal chosen from the group comprising lithium, sodium, potassium, rubidium, cesium and mixtures of these metals. Of these alkali metals are preferred more common and less expensive sodium and potassium, either separately or in mixture with each other.

Component of the alkali metal in the isomerization catalyst may be applied to a wide variety of media. The media must be anhydrous, i.e. not containing or containing no water. The above can also be achieved by pre-calcining the carrier. This preliminary calcination is usually performed at relatively high temperature, e.g., 400-700C, and for a time sufficient for an effective and significant removal of adsorbed or bound water from the media. The carrier should be inert, i.e. the media should not chemically interact with the alkaline metal. Examples of media that may be used are aluminum oxide (gamma-this - or theta), ACS is on silicon, magnesium oxide, silica-alumina, silica-alumina-magnesium oxide, titanium oxide, zirconium oxide, bauxite, clay, pumice, activated carbon and molecular sieves. The preferred carrier based on alumina (also commonly referred to as alumina). Preferably, the carrier has a specific surface area of more than 25 m2/g, more preferably more than 100 m2/g (as determined by BET method). Most preferred is gamma-alumina.

The alkali metal may be deposited on the carrier by any suitable method. One method, which is considered the most appropriate, is the evaporation of the alkali metal and the vapor transmission over the media. This method is performed at relatively low temperatures. Sodium, for example, melts at approximately 97C, and when the application of a selected medium with sodium, it is preferable to carry out the impregnation or subsequent removal of sodium at temperatures in the range of 100-150C. above can also be performed, for example, by melting sodium and nakayanan molten sodium to the media or transmission of a current of inert gas, such as nitrogen or argon through the molten sodium and above the layer of the selected media located in a separate zone, maintained at a given temperature, when sootvetstvuyushchaya cooling and heating. Potassium melts at about 62C, and, thus, impregnation of the selected catalyst potassium can be performed even at low temperatures.

Another way to obtain a catalyst comprising alkali metal on a carrier, according to this invention is expressed in mixing an alkali metal with a carrier at a temperature above the melting temperature of the specified alkali metal, in an inert atmosphere.

Catalysts with improved stability towards air and water can be obtained through the use of special additives in the way of receiving. Namely, the catalyst is preferably obtained by use of carbonates, sulfates, hydroxides or oxides of the above-mentioned alkali metals as additives. The halides of alkali metals are not recommended for use as additives, because the media is generally not capable of withstanding temperatures (about 800C)at which these compounds interact with the sodium or lithium. Temperature, which is very appropriate when using carbonate as additives, correspond to temperatures in the range from 160 to 200C. If the hydroxide is used as an additive, a catalyst obtained by heating an alkali metal, hydroxide of alkali metal and aluminum oxide at a temperature higher than the temperature of plvl is of an alkali metal. The metal can also be used in the form of an alloy consisting of two or more kinds of alkali metals. A typical example of such an alloy is an alloy of sodium-potassium. Examples of the hydroxide of the alkali metal hydroxides are lithium, sodium, potassium, rubidium and other metals of group I of the periodic table. Can be used one or more types of such hydroxides. Used alkaline metal and the hydroxide of the alkali metal can be, for example, lithium and hydroxide of lithium, sodium, and sodium hydroxide, and potassium hydroxide potassium or rubidium and rubidium hydroxide, sodium and potassium hydroxide, or lithium and potassium hydroxide. You can also proceed from solutions containing compounds which upon heating are converted into other compounds of alkali metals. For example, can be used bicarbonate or formate, which are both converted into carbonates when heated. However, the formate less preferred.

In a preferred embodiment of the present invention, a catalyst was prepared using an additive selected from the group consisting of Na2CO3, K2CO3, NaOH, KOH, NaHCO3and KHCO3. It is most preferable to use Na2CO3, K2CO3, NaOH or KOH.

The shape of the catalyst particles is not critical; the catalyst may be used is in the form of powders, flakes, beads, granules, rings, extrudates or in any other suitable form. The catalyst particles can be used in a wide range of sizes, for example, in the form of granules with a diameter of 1-5 mm or in the form of powders, particles which have a particle size 15-35 mesh (largest diameter 13-0,5 mm), 30-80 mesh (longest diameter of approximately 0,595-0,177 mm) or 100-325 mesh (largest diameter of 0.15-0.04 mm). Usually, the migration of double bonds proceeds more rapidly than smaller particles of the catalyst.

If obtaining catalyst use a different Supplement than a hydroxide of alkaline metal, alkaline metal, preferably present in the catalyst in amounts of more than 1 mass %, more preferably more than 1.5 mass % and, most preferably, more than 2 mass %, based on the mass of the carrier. Preferably, the alkali metal is present in an amount of not more than 70 mass %, more preferably not more than 30 mass % and, most preferably, not more than 15 mass %, based on the mass of the carrier. When receiving as additives use hydroxides of alkali metals, alkaline metal, preferably present in the catalyst in amounts of more than 1 mol.%, more preferably, more than 2 mol.% and, most preferably, more than 3 mol.%, concerning the number of supplements. Preferably, the alkali meta is l is present in an amount of not more than 100 mol.%, more preferably, not higher than 40 mol.% and, most preferably, not higher than 20 mol.%, concerning the number of supplements. Preferably, the additive is used in amounts of not less than 1 mass %, more preferably not less than 1.5 mass % and, most preferably, not less than 2 mass %, based on the mass of the carrier. The additive is preferably used in an amount of not more than 100 mass %, more preferably not more than 70 mass % and, most preferably, not more than 30 mass %, based on the mass media.

For details on the preparation of the catalyst based on an alkali metal, acceptable for use in the method according to this invention, see GB 1416317, GB 1492059, US 2952719 and US 3897509.

Stage (i) of the method according to the invention, the stage of isomerization of C6-C28- alpha-olefins, preferably performed in an inert atmosphere at temperatures in the range of 10-200C, more preferably at a temperature in the range from 15 to 100C and most preferably at a temperature in the range from 20 to 60C. phase isomerization can be carried out in the liquid phase or in vapor phase. Preferably, the isomerization is carried out at atmospheric pressure. Samaritane olefins obtained in stage (i), can be used in stage (ii) without purification. The alpha-olefins can be brought into contact with the catalyst for this breath is retenu any, known from the prior art, by the way. The interaction may be, for example, implemented as a periodic interaction or by passing current olefins through a reactor Packed layer.

The amount of catalyst used in relation to the total number isomerizing the olefin is preferably not less than 1 mass %, more preferably at least 2 mass % and, most preferably, not less than 4 mass %. Preferably, not more than 50 mass %, more preferably not more than 40 mass % and, most preferably, not more than 20 mass % of the used catalyst, relative to the number isomerizing olefins.

At stage (ii) of the method according to this invention olefinic C6-C28the hydrocarbons formed in stage (i), is subjected to the interaction with a cyclic anhydride of an unsaturated dicarboxylic acid such as maleic anhydride, at a temperature and for a time sufficient to obtain alkenyl-substituted compounds of cyclic anhydride, as shown in figure 3,

c R3and R4groups that represent aliphatic hydrocarbon groups. The so-called ene-reaction. Yong-reaction requires a relatively high temperature because the activation energy of the specified reaction high, so what. approximately 20 kcal/mol. The reaction rate for the interaction also increases sharply as a function of temperature, and therefore, it is advisable to use a relatively high reaction temperature, the product formed by the reaction rate, which is at least satisfactory satisfactory. The interaction may be carried out in any known prior art method, for example as described in WO 97/30039.

In the method according to this invention, Yong-reaction is preferably carried out at a temperature not lower than 150C, more preferably below 180C, and most preferably not lower than 200C. Preferably, Yong-reaction is carried out at a temperature not exceeding 300C, more preferably not higher than 250C, and most preferably not higher than 230C. the Reaction time preferably ranges from 0.5 to 24 hours. More preferably, the reaction time ranges from 2 to 14 hours. Most preferably, the reaction time ranges from 5 to 9 hours. The ratio between the olefin and the cyclic anhydride of an unsaturated dicarboxylic acid is preferably in the range of 0.8-2.0 to 1 (i.e. use from 80 to 200 mol.% the olefin). More preferably, the ratio of olefin and a cyclic anhydride of an unsaturated dicarboxylic acid is in the range from 1.0 to 1.5 to 1 (i.e., 100-150 is ol.% the olefin). Most preferably, this ratio is in the range from 1.1 to 1.3 to 1 (i.e. 110-130 mol.% the olefin).

You can implement the interaction between the olefinic hydrocarbon and a cyclic anhydride of an unsaturated dicarboxylic acid in the presence of non-polar organic solvent. However, this option is less preferred because of the lack of use of the solvent is that the solvent must then be removed in a separate step. Therefore, the most preferable way to perform in the absence of solvents. However, if the viscosity of olefinic hydrocarbons is too high, it is recommended to add a non-polar solvent, such as easily removable lower alkane.

In a preferred embodiment, stage (ii) is conducted in the presence of acceptor radicals. Such acceptor radicals is designed to reduce the total amount of by-products, particularly high molecular weight adducts, which may be formed in stage (ii), in particular, adducts of olefin-anhydride-olefin.

Suitable acceptors radicals are hydroxyl aromatic compounds and linearisations connection. Examples of such hydroxyl aromatic compounds are phenol, o-cresol, m-cresol, p-cresol, thymol, carvacrol, duranol, isourea, and tert-butylhydroquinone, 2-, 3 - and 4-aminophenol, hydroquinone, resorcinol, catechin, thymohydroquinone, olivetol, 4-tert-butylcatechol, 2,6-di-tert-butyl-4-METHYLPHENOL and 4-methoxyphenol. Examples of suitable linearisations compounds are phenothiazines, diphenylamine, 4,4'-thio-bis(6-tertiary-butyl-o-cresol), tetramethylthiuramdisulphide, 2-aminodiphenylamine, 4-aminodiphenylamine, 4,4'-diaminodiphenylamine, 2-hydroxydiphenylamine, 3-hydroxydiphenylamine, 4-hydroxydiphenylamine, di-2-tolylamino, di-3-tolylamino, di-4-tolylamino, 3,4-detailmen, 1-naphthylvinyl, 2-naphthylvinyl, 1-naphthyl-2-tolylamino, 1-naphthyl-4-tolylamino 2-naphthyl-2-tolylamino, 2-naphthyl-4-tolylamino and 9,10-dihydrophenazine.

More preferably, the acceptor radicals is linearisations connection. Most preferably phenothiazines.

Cyclic anhydride of an unsaturated dicarboxylic acid according to this invention is a compound of the General formula shown in figure 4,

with R5meaning, optionally substituted C2-C4- alkenylphenol group. Possible substituents on C2-C4- alkenyl groups include alkyl groups, alkeline group, kalkilya group or kalkaylkia group. Cyclic anhydride of an unsaturated dicarboxylic acid preferably chosen from the group comprising maleic shall Madrid, itacademy anhydride and citraconic anhydride. Most preferably, the specified anhydride is maleic anhydride.

Alkenyl-substituted cyclic anhydrides obtained by the method according to this invention, where alafinova-unsaturated C6-C28-hydrocarbons, of which at least 30 mass % are alpha-olefins and at least 15 mass % of a given alpha-olefin, are vinylidene isomer, isomerism with the use of a catalyst containing alkali metal on a carrier, are physically distinguishable from alkenyl-substituted cyclic anhydrides obtained from the same raw materials, but known from the prior art methods isomerization. More precisely, these of alkenyl-substituted cyclic anhydrides different from alkenyl-substituted cyclic anhydrides derived from isomerized C6-C28linear alpha-olefins, and from alkenyl-substituted cyclic anhydrides derived from C6-C28unsaturated hydrocarbons having the same number vinylidene isomer, but isomerizing known from the prior art method of isomerization, the nature alkenylphenol chain. Specifically, these anhydrides are different from each other according to the nature of substituents on the specified alkenylphenol chain. This difference in structure is expressed, such as the er, in the improved operational characteristics in the sizing of paper.

The invention, furthermore, relates to a method of obtaining an additive for paper sizing, where the cyclic anhydride of an unsaturated dicarboxylic acid, which preferably is a maleic anhydride are subjected to interaction with one or more internal alafinova-unsaturated C6-C28- hydrocarbons, where these internal alafinova-unsaturated C6-C28- hydrocarbons obtained by the implementation phase isomerization of one or more alafinova-unsaturated C6-C28hydrocarbons of which at least 30 mass % are alpha-olefins, in the presence of a catalyst comprising an alkaline metal on the carrier. The terms of cooperation and preferred options for implementation were consistent with the above.

The above additive for paper sizing suitable for use in the manufacture of paper and cardboard with the aim of imparting water-repellent ability. Alkenyl-substituted compounds of cyclic anhydride by nature are hydrophobic and, therefore, hardly soluble in a poor solvent such as water. Therefore, before adding a sizing agent to the wet raw material for paper, alkenyl-substituted cyclic connection is midride dispersed in the aquatic environment. However, because of alkenyl-substituted compound of the cyclic anhydride has a tendency to decomposition in the presence of water and, thus losing sizing ability, preferably, a sizing dispersion comprising alkenyl-substituted compounds of cyclic anhydride to use quickly after receipt. Preferably, a sizing dispersion formulate near the site of intended use, that is, the paper factory.

To achieve proper sizing paper or cardboard, particle size of alkenyl-substituted compounds of cyclic anhydride contained in the dispersion must be below a certain value. The size of fine particles of alkenyl-substituted compounds of cyclic anhydride get by applying high shearing forces during formation of the dispersion, using a block of high pressure. Getting carried out, for example, in gammexane or homogenizer using a water-soluble polymer compound, such as cationically starch or surfactant, such as a simple polyoxyalkylene ether.

Alkenyl-substituted compounds of cyclic anhydride can also be used to achieve different ester, amide, Mednykh and other derivatives, which are used to certainly the extent in applied fields, similar to those in which use existing ASA, for example, as additives to oil and as corrosion inhibitors.

The method according to this invention is additionally illustrated by the following non-limiting examples.

EXAMPLES

Example 1 and comparison example to A

As the initial substance use C18- alpha-olefins, for example, Ineos, containing high amounts of branched educt (about 43 mass % vinylidene isomers).

Example 1:

In example 1, this original substance will isomerized using the catalyst sodium-aluminum oxide. Specifically, 22 g (strength of 0.159 mol) K2CO3dissolved in 49 ml of demineralized water. Under stirring, the solution is added to 100 g (0,981 mol) g-Al2O3(Merck, surface 120-190 m2/g). Impregnated Al2O3dried 3:30 h at 120C and subsequently calicivirus for 3:20 h at 500C. Then, the carrier material is transferred into a glass vessel, which vacuum using an oil pump and washed with a jet of nitrogen. The carrier material was stored in a nitrogen prior to use.

Then, 24,97 g of the material of the carrier with K2CO3, Al2O3stirred for 2 hours under vacuum (oil pump) at 160C in dehgolan glass vessel, equipped with a magnetic stirrer. After flushing with nitrogen mater the Alu-the media is allowed to cool to ambient temperature and add 1,290 g (0,056 mol) sodium (Na) in a stream of nitrogen. After complete addition of the sodium, the medium is stirred for further 90 minutes at 160C for the final preparation of the catalyst. The catalyst was prepared in the form of a dark blue/grey powder.

Then the catalyst is allowed to cool to ambient temperature and add 374,87 g (of 1.485 mol) C18- alpha-olefin (ex Ineos) in a stream of nitrogen. Then the reaction mixture is heated to 62C and maintained at this temperature for 3 hours the Reaction mixture is allowed to cool, and isomerizate is removed from the reactor. Additional processing isomerate described for the case of PENTACARBONYL iron (Fe(CO)5in the example of A comparison below is not required.

Next, alkanniny succinic anhydride receive the following way. 126,76 g (0,502 mol) isomerizing C18- olefin is added to the reaction vessel in a stream of nitrogen. Olefin is heated to 50C and at this temperature add 40,96 g (0,418 mol) of maleic anhydride flakes (MSA) in a stream of nitrogen. After MSA melts (~53C), the reaction mixture inertizing by vacuum (oil pump) and flushing with nitrogen (three times).

The temperature was then raised to 200C for 15 min, and after the start of boiling MSA the temperature was raised to 230C for 1:30 PM

The specified temperature withstand additionally for 5:30 h and then the excess olefin and unreacted MSA distilled under reduced is th pressure (oil pump). Alkenylamine succinic anhydride (ASA) are obtained in the form of a brownish transparent liquid.

Example comparison A:

In the example of A comparison, the same starting material as used in example 1, isomerized using PENTACARBONYL iron as a homogeneous catalyst in the same way as described in US 4587374. Homogeneous catalyst and residual impurities that cause intense dark orange - brown staining of the isomerized product, separating the isomerate distillation under reduced pressure. This stage, which, due to the nature of the distillation, includes loss samaritano of olefin (product)must be included to prevent adverse impacts on the color formed ASA.

Appropriate alkanniny succinic anhydride is produced by adding to the reaction vessel 154,10 g (0,610 mol) isomerizing C18- olefin and 49,85 g (0.508 mol) of maleic anhydride flakes (MSA) in a stream of nitrogen. The suspension is heated to 53C and after MSA melts, the reaction mixture inertizing by vacuum (oil pump) and flushing with nitrogen (three times). The temperature was then raised to 200C for 15 min, and after the start of boiling MSA the temperature was raised to 230C for 1:30 PM the Specified temperature withstand additionally for 5:30 h and then the excess olefin and unreacted MSA of perigonia the t under reduced pressure (oil pump). Alkenylamine succinic anhydride (ASA) are obtained in the form of a brownish transparent liquid.

Example 1 and example comparison A: sizing characteristics:

Sizing characteristics of the ASA, obtained in example 1 and example comparison of A, respectively, estimate the magnitude of the Cobb 60 (g/m2(water samples), as described in EN 20535 (old DIN 53132). Tests perform sizing, using pulp from a mixture of 80/20 solid wood/timber of coniferous breeds (sagasti SR 36). In use as a filler of calcium carbonate, 15 wt.%, (Hydrocarb 50 BG, Omya) and the retention system is Compozil with 0.5 wt.% cationic potato starch (Raisamyl 142) and 0.3 wt.% silicasol Eka NP 442 (Eka Chemicals). Aluminum sulfate is used in an amount of 0.15 wt.%, leading to pH 7.8 in the pressure box. Paper 75 g/m2get on a pilot paper machine at 2 m/min

The ASA emulsion used as a sizing agent obtained by emulsification of 15 g of ASA and 185 g of starch solution (4% of the solid phase) using a kitchen blender (Osterizer). Less Cobb value means better sizing characteristics and Vice versa.

As follows from table 1, the ASA on the basis of heterogeneous olefin isomerization has significantly better performance than the ASA on the basis of homogeneous isomerization.

Table 1
Values Cobb for example 1 and comparison example A:
Example 1
Na
media
An example of comparison of A
Fe(CO)5
ASA-quantity [kg/t]
0,6
0,9
1,2
(Cobb)
33,5
24
21,7
(Cobb)
59,7
28,5
24,5

Examples 2-4

As the initial substance use C18- alpha-olefins (ex-Chevron), containing low amounts of branched educt (about 8 mass % vinylidene isomers).

Example 2:

The original substance will isomerized using the catalyst sodium-aluminum oxide. The carrier material with K2CO3, Al2O3this catalyst was prepared by the method described in example 1. Then, 26,67 g of the material of the carrier with K2CO3, Al2O3stirred for 2 hours under vacuum (oil pump) at 160C in dehgolan glass vessel, equipped with a magnetic stirrer. After flushing with nitrogen add 1,373 g (to 0.060 mol) sodium (Na) in a stream of nitrogen and the medium is stirred for further 90 minutes at 160C for the final preparation of the catalyst. The catalyst was prepared in the form of a dark blue/grey powder.

Then the catalyst is try to cool to ambient temperature and catalyst type 394,5 g (1,563 mol) C 18- alpha-olefin in a stream of nitrogen. Then the reaction mixture is heated to 60C and maintained at this temperature for 3 hours the Reaction mixture is allowed to cool, and isomerizate is removed from the reactor. Additional processing of the isomerized product is not required.

Next, alkanniny succinic anhydride receive the following way. 123,72 g (0,490 mol) isomerizing C18- olefin is added to the reaction vessel in a stream of nitrogen. Olefin is heated to 50C and at this temperature add 40,04 g (0,408 mol) of maleic anhydride flakes (MSA) in a stream of nitrogen. After MSA melts (~53C), the reaction mixture inertizing by vacuum (oil pump) and flushing with nitrogen (three times). The temperature was then raised to 200C for 15 min, and after the start of boiling MSA the temperature was raised to 230C for 90 minutes.

The specified temperature withstand additionally for 5:30 h and then the excess olefin and unreacted MSA distilled under reduced pressure (oil pump). Alkenylamine succinic anhydride (ASA) are obtained in the form of a brownish transparent liquid.

Example 3

In example 3, starting material will isomerized as described in example 2 using the catalyst sodium-aluminum oxide.

Next, alkanniny succinic anhydride receive the following way. 125,87 g (0,499 mol) isomerizing C18- olefin EXT the keys to the reaction vessel. Then the olefin inertizing by vacuum (oil pump) and flushing with nitrogen (three times). Then the olefin is heated to the reaction temperature of 230C. When the reaction temperature is reached, the olefin is added dropwise, within two hours, 40,74 g (0,415 mol) of molten MSA. When you are finished adding MSA, temperature 230C incubated for another 5 hours. After that, the excess olefin and unreacted MSA distilled under reduced pressure. Alkenylamine succinic anhydride (ASA) are obtained in the form of a brownish transparent liquid.

Example 4

In example 4, the original substance will isomerized as described in example 2 using the catalyst sodium-aluminum oxide.

Next, alkanniny succinic anhydride receive the following way. 111,10 g (0,440 mol) isomerizing C18- olefin is added to the reaction vessel. Then the olefin add to 6.5 mg fenotiazina (0,03310-3mol, 0,009 mol.% relative to the molar number MSA). Then a mixture of olefin/phenothiazines inertizing by vacuum (oil pump) and flushing with nitrogen (three times). The mixture is then heated to the reaction temperature of 230C. When the reaction temperature is reached, to the mixture is added dropwise, within two hours, 35,96 g (0,367 mol) of molten MSA. When you are finished adding MSA, temperature 230C incubated for another five hours. After that, the excess olefin and n is reacted MSA distilled under reduced pressure. Alkenylamine succinic anhydride (ASA) are obtained in the form of a brownish transparent liquid.

Analysis of the products of the above examples made using gel permeation chromatography shows (see table 2)that adding fenotiazina leads to the reduction of by-products, in particular, the amount of adduct olefin-maleic anhydride-olefin (OMO).

Table 2
The content of the adduct olefin-maleic anhydride-olefin (adduct 1)
experimentExample
1
An example of comparison AExample
2
Example
3
Example
4
Acceptor
[mol.%]
----Phenothiazines
0,009
OMO
[%-GPC]
5,64,53,37,51,5

1. The method of receiving alkenyl-substituted cyclic anhydride, which includes stages
(i) the implementation stage of isomerization of double the Oh connection of one or more alafinova unsaturated With 6-C28hydrocarbons of which at least 30 wt.% is alpha-olefin and at least 15%, preferably at least 25 wt.% the specified alpha-olefin is vinylidene isomer by contacting these hydrocarbons with a catalyst comprising an alkaline metal on the carrier, and
(ii) the interaction of the resulting isomerized olefin With6-C28-hydrocarbons with a cyclic anhydride of an unsaturated dicarboxylic acid with the formation of alkenyl-substituted cyclic anhydride.

2. The method according to claim 1, in which the cyclic anhydride of an unsaturated dicarboxylic acid selected from the group consisting of maleic anhydride, taconova anhydride and Tarakanova anhydride.

3. The method according to claim 1 or 2, in which the acceptor radicals present in stage (ii), the specified acceptor radicals chosen from hydroxyl aromatic compounds and linearisations connections.

4. The method according to claim 1 or 2, in which alafinova unsaturated hydrocarbon is alafinova unsaturated With14-C24-hydrocarbon, preferably alafinova unsaturated With16-C22-hydrocarbon, most preferably alafinova-unsaturated C16or C18-hydrocarbon, or a mixture alafinova-unsaturated C16and C18-hydrocarbons.

5. SPO is about according to claim 3, which alafinova unsaturated hydrocarbon is alafinova unsaturated With14-C24-hydrocarbon, preferably alafinova unsaturated With16-C22-hydrocarbon, most preferably alafinova-unsaturated C16or C18-hydrocarbon, or a mixture alafinova-unsaturated C16and C18-hydrocarbons.

6. The method according to any one of claims 1, 2 or 5 in which the catalyst contains as the alkali metal is sodium or potassium, either individually or in combination with the compound of another metal.

7. The method according to claim 3, in which the catalyst contains as the alkali metal is sodium or potassium, either individually or in combination with the compound of another metal.

8. The method according to any one of claims 1, 2, 5, or 7, in which the carrier is chosen from the group consisting of aluminum oxide, silicon oxide, magnesium oxide, silica-alumina, silica-alumina, silicon oxide-aluminum oxide-magnesium oxide, titanium oxide, zirconium oxide, bauxite, clay, pumice, activated carbon and molecular sieve.

9. The method according to claim 3, in which the carrier is chosen from the group consisting of aluminum oxide, silicon oxide, magnesium oxide, silica-alumina, silica-alumina, silicon oxide-aluminum oxide-magnesium oxide, titanium oxide, oxide of circa the Oia, bauxite, clay, pumice, activated carbon and molecular sieve.

10. The method according to any one of claims 1, 2, 5, 7 or 9, in which the alkali metal present in the catalyst in an amount of 1-30 wt.%, relative to the mass media.

11. The method according to claim 3, in which the alkali metal present in the catalyst in an amount of 1-30 wt.%, relative to the mass media.

12. The method according to any one of claims 1, 2, 5, 7, 9 or 11, in which the carrier based on alumina is a gamma-alumina preferably with a specific surface area of at least 100 m2/year

13. The method according to claim 3, in which the carrier based on alumina is a gamma-alumina preferably with a specific surface area of at least 100 m2/year

14. The method according to any one of claims 1 to, 2, 5, 7, 9, 11 or 13, by which stage isomerization is performed in an inert atmosphere at a temperature in the range from 10C to 200C, preferably from 20C. to 60C.

15. The method according to claim 3, in which stage isomerization is performed in an inert atmosphere at a temperature in the range from 10 to 200C., preferably from 20 to 60C.

16. The method according to any one of claims 1 to, 2, 5, 7, 9, 11, 13 or 15, in which stage (ii) is performed at a temperature in the range from 150C to 300C and in which the ratio between the olefin and the cyclic anhydride of an unsaturated dicarboxylic acid is in the range ot,8-2,0 to 1.

17. The method according to claim 3, in which stage (ii) is performed at a temperature in the range from 150C to 300C and in which the ratio between the olefin and the cyclic anhydride of an unsaturated dicarboxylic acid is in the range of 0.8-2.0 to 1.

18. The use of alkenyl-substituted cyclic anhydride obtained by the method according to any one of claims 1 to 17, as an additive for paper sizing in the production of paper and cardboard.

19. The method of obtaining supplements for paper sizing, in which the cyclic anhydride of an unsaturated dicarboxylic acids, preferably maleic anhydride, is subjected to the interaction with one or more internally alafinova unsaturated With6-C28-hydrocarbons, where these internally alafinova unsaturated With6-C28the hydrocarbon get through stage isomerization of one or more alafinova unsaturated With6-C28hydrocarbons of which at least 30 wt.% is alpha-olefin and at least 15%, preferably at least 25 wt.% the specified alpha-olefin is vinylidene isomer in the presence of a catalyst comprising alkali metal on a carrier.

20. The method according to claim 19, in which the catalyst includes, as the alkali metal is sodium or potassium, either individually or in combination with another junction m is metal, and a carrier selected from the group consisting of aluminum oxide (gamma-this - or theta), silicon oxide, magnesium oxide, silicon oxide-aluminum oxide, silicon oxide-aluminum oxide-magnesium oxide, titanium oxide, zirconium oxide, bauxite, clay, pumice, activated carbon and molecular sieves.



 

Same patents:

Packing laminate // 2455169

FIELD: process engineering.

SUBSTANCE: invention relates to production and application of packing laminate and to food and drink package made therefrom. Laminate comprises, at least, one main layer of paper or cardboard and, at least, one barrier layer for fluid and, preferably, at least one barrier layer for gas. Paper or cardboard is impregnated with composition containing adhesive selected from the group including ketene dimers and multimers, succinic anhydride, colophony and mixes thereof, as well as acrylamide-based polymer.

EFFECT: higher water resistance.

15 cl, 10 tbl, 8 ex

FIELD: textiles, paper.

SUBSTANCE: paper base is intended for internal and external sizing, which has high dimensional stability, and can be used in pulp and paper industry. Paper base contains cellulose fibers, at least one filler, and sizing agent. At that the paper base has a coefficient of hygroextension from 0.6 to 1.5%. The Scott internal constraint in the transverse direction is not greater than 300 J/m2, and/or Scott internal constraint in the longitudinal direction is not greater than 300 J/m2. Also a method of manufacturing the paper base and versions of paper base are proposed.

EFFECT: increased dimensional stability and durability of the surface of the paper base.

26 cl, 24 dwg, 15 tbl, 5 ex

Paper sizing // 2429323

FIELD: textile, paper.

SUBSTANCE: invention relates to a water dispersion (its version) of a cellulose-active gluing substance (its version), a method to produce the water dispersion (its version), application of the water dispersion and a method of paper making. The water dispersion of the cellulose-active gluing substance contains an acid anhydride, an anion polyelectrolyte and a nitrogen-containing organic compound, which is an amine or a corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The method to produce the water dispersion of the cellulose-active gluing substance and its version includes dispersion of the acid anhydride in the water phase in presence of the anion polyelectrolyte and the nitrogen-containing organic compound, which is the amine or the corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The above specified water dispersions of the cellulose-active gluing substance may be used for sizing in mass or for surface sizing in paper making. The method of paper making includes addition of the above-specified water dispersions of the cellulose-active gluing substance to the water suspension of cellulose with subsequent dehydration of the produced suspension on a net of a paper-making machine or by application of these dispersions onto a surface of a cellulose sheet.

EFFECT: improved stability of the gluing water dispersion and efficiency of sizing, energy and capital cost saving.

41 cl, 13 tbl, 7 ex

FIELD: textile, paper.

SUBSTANCE: ground paper contains a certain amount of cellulose fibres and a gluing substance, besides, ground paper has a coefficient of hygro-expansion from 0.6 to 1.5%, inner link of Scott in cross direction not more than 130 J/m2 and/or inner link of Scott in longitudinal direction of not more than 130 J/m2.

EFFECT: increased stability of dimensions and strength of ground paper surface.

28 cl, 28 dwg, 12 tbl, 5 ex

FIELD: textile, paper.

SUBSTANCE: emulsion contains anhydrides of fatty acids, which are produced from unsaturated or saturated fatty acids or their mixtures with length of chain from 12 to 24 carbon atoms and are preserved as liquid at the temperature below 50C. If necessary, emulsion for paper sizing additionally contains a reactive or a non-reactive agent for sizing and/or a fixator with aluminium ions content. Emulsion for paper sizing is produced by emulsification of fatty acids in water phase by means of shearing forces or intense mixing. Emulsifiers are used to form emulsion. Emulsion is used for continuous sizing of paper mass or to treat paper surface in sizing press. Emulsion is used to produce paper.

EFFECT: eliminates formation of sediments with sticky consistency with regular indices of pH in process of paper making and reduced duration of contact with water system.

16 cl, 4 tbl, 5 ex

FIELD: construction.

SUBSTANCE: ground contains cation water-fast additive, alkaline glueing agent and anion activator in specified amount. Anion activator it contains is a component selected from group, including polyacrylate, sulfonate, carboxymethylcellulose and galactomannan hemicellulose. Ground paper has pH from approximately 7.0 to approximately 10, and strength of internal link from approximately 25 to approximately 350 millifeet per pound per square inch. This ground paper is produced by contact of a certain amount of cellulose fibres with water-fast additive, alkaline gluing agent and anion activator, serially and/or simultaneously.

EFFECT: improved physical properties of ground paper and expanded assortment of paper tapes to cover joints.

22 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: substrate has a paper base containing cellulose fibre from deciduous wood with particle size smaller than 200 mcm after grinding in amount of not more than 45 wt % and average fibre length between 0.4 and 0.8 mm and filler in amount of 5-40 wt %, particularly 10-25 wt % in terms of the weight of cellulose.The substrate at least contains one polymer layer lying at least on one side of the paper base. There is a layer with a binding agent between the polymer layer and the paper base. The binding agent is a hydrophilic film-forming polymer made from hydroxypropylated starch and/or thermally modified starch. This layer may contain a pigment in form of calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulphate.

EFFECT: reduced limpness and obtaining pure-bred production wastes.

27 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: adhesive contains a basic component in form of brewer's or distiller's yeast which is a waste from the brewing or distillation industry. The residue of brewer's or distiller's yeast is treated with 2% sodium hydroxide solution in ratio of 1:1. The adhesive composition contains the treated residue of brewer's yeast, glycerin and boric acid. Components of the composition are in the following ratio, pts. wt: residue of brewer's or distiller's yeast treated with 2% sodium hydroxide solution in ratio of 1:1 96.0-98.0; glycerin 1.9-3.7; boric acid 0.1-0.3.

EFFECT: adhesive composition has high adhesive capacity and low cost.

2 tbl

Paper making method // 2384661

FIELD: textile, paper.

SUBSTANCE: method relates to paper production and can be used in pulp-and-paper industry. Method involves the use of cellulose suspension from cellulose fibres and fillers (optional), dehydration of cellulose suspension on grid or sieve so that a sheet can be formed. Then the sheet is dried. In this method there used is polymeric addition which includes ethylenically unsaturated monomer soluble in water or potentially soluble in water, and ethylenically unsaturated monomer containing a reactive group. The latter represents an epoxy group. The polymeric addition used has molar weight which is less than one million. Polymer is obtained from mixture of monomers, which includes acrylamide and glycidyl methacrylate. Thus, the obtained polymer is used as an addition for increase of paper durability in dry condition, in wet condition, as reagent for internal paper sizing and for surface sizing.

EFFECT: increasing paper durability.

17 cl, 2 tbl, 3 ex

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

EFFECT: higher sizing efficiency with good drainage, retention and serviceability of papermaking machine.

24 cl, 3 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing ketopantolactone, which is widely used in synthesis of pantothenic acid (vitamin B5), as well as other biologically active substances. The method of producing ketopantolactone involves oxidative dehydrogenation of pantolactone under the action of electrochemically generated bromine from a bromide anion source in an electrolysis cell equipped with an anode, a cathode and a stir-bar in the medium of a chlorine-containing organic solvent in a two-phase system containing an organic and an aqueous layer while passing electrical current of 4-6 F per 1 mole pantolactone and stirring the reaction mass at a rate of 1-4 rps at temperature 35-70C and pH of the medium equal to 0.5-1.5.

EFFECT: simple technology of producing ketopantolactone, avoiding the need to use dangerous (poisonous) and hard to handle molecular bromine, high conversion of the starting pantolactone and high output of the end product which reaches 85%.

4 cl, 12 ex, 1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of preventing precipitation of fumaric acid when producing maleic acid anhydride comprising the following steps: a) absorption of maleic acid anhydride from the mixture of products obtained as a result of partial oxidation of benzene, olefins having 4 carbon atoms and n-butane, in an organic solvent or water as an absorbent, b) separation of maleic acid anhydride from the absorbent, containing fumaric acid, wherein the absorbent regenerated thus, which contains fumaric acid, is completely or partially catalytically hydrogenated and completely or partially returned to the absorption step (a), wherein fumaric acid is hydrogenated to amber acid.

EFFECT: method enables to prevent precipitation on equipment components and the resulting clogging, cleaning procedures and switching off.

16 cl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing maleic anhydride in a fluidised bed by oxidising material which contains C4 hydrocarbons with molecular oxygen or oxygen-containing gas in a reactor with a fluidised bed at reactor temperature 325-500C in the presence of a catalyst capable of working in the fluidised bed, containing mixed oxides of vanadium and phosphorus, wherein the catalyst is prepared as follows: (a) preparation of a catalyst precursor containing mixed vanadium and phosphorus oxide; (b) packing the catalyst precursor; (c) crushing the catalyst precursor to particles whose average size is less than one micrometre in diametre; (d) moulding particles which are capable of working in the fluidised bed, with bulk density greater than or equal to 0.75 g/cm3 from the packed crushed catalyst precursor; and (e) annealing said particles in boiling conditions, where output of the maleic anhydride is increased by adding a compensating catalyst into the reactor with the fluidised bed, wherein said compensating catalyst contains alkyl ether of orthophosphoric acid of formula (RO)3P=O, where R is hydrogen or C1-C4 alkyl and at least one R is C1-C4 alkyl, where the compensating catalyst is prepared by saturating the catalyst obtained according to steps (a) to (e) with alkyl ether of orthophosphoric aid. The invention also discloses a method of improving operation of the mixed vanadium-phosphorus oxide catalyst for producing maleic anhydride from butane in a fluidised bed. The invention also relates to a catalyst capable of working in the fluidised bed, for producing maleic acid by oxidising material which contains C4 hydrocarbons.

EFFECT: invention ensures high output of the end product at low working temperatures.

31 cl, 2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: method of purifying maleic anhydride involves heating molten initial crude product to 60-65C and then cooling to 53-54C and filtering at temperature of 51.5-53C. Filtration is carried out on a filter with hole size of 0.01-0.05 mm and the molten mass is thermally processed in an atmosphere of dry inert gas or in sealed conditions in an atmosphere of dry inert gas.

EFFECT: high technological effectiveness of the process owing to its short duration and use of lower temperature parametres and higher degree of purification of maleic anhydride.

1 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: described are 2,4,6-phenyl-substituted cyclic ketoenols of formula (I, in which W, X, Y and CKE are given in invention formula. Also described are esters of acylamino acids of formula (II), substituted derivatives of phenylacetic acid of formula (XXIX), (XXVII), (XXXI), which are intermediate compounds for obtaining formula (I) compound.

EFFECT: obtaining herbicidal preparation containing combinations of biologically active substances, including (a), formula (I) compound and (b') improving compatibility with cultural plants mefenpyr-diethyl, with weight ratio 5-1:1-7.7.

9 cl, 46 tbl, 36 ex

FIELD: physics; operation.

SUBSTANCE: invention relates to the chemical industry, particularly to the automatic control systems and can be used for temperature support of the reaction mixture in chemical reactors. The system of automatic temperature profile support in the reactor with distributed constants in maleic anhydride production contains two control systems: cascade automatic control system (ACS) of coolant temperature control in the reactor and ACS of benzene-air mixture fed to the reactor where the correction signal is inleted according to reaction mixture temperature. The correction signal represents the sum of the signals about reaction mixture temperature in the measurement points positioned along the reactor height multiplied to the weight factor determined intuitively or from optimization problem solution. Then the correction signal is compared with assignment signal on the functional generator serving as algebraic adder. The invention allows to increase the temperature support accuracy in the reactor at maleic anhydride production.

EFFECT: increasing of the temperature support accuracy in the reactor.

2 cl, 2 dwg

The invention relates to a method for producing a cyclic anhydride or a nitride of hydrocarbon and oxygen-containing gas in the presence of an appropriate catalyst, in particular to a method of reducing or eliminating the risk of explosion or fire in the headspace of the reactor system, in which there is a formation of the anhydride, or nitrile of hydrocarbon and oxygen

The invention relates to a method for obtaining succinic anhydride used in the production of pharmaceuticals, insecticides, as a hardener of epoxy resins, in analytical chemistry

The invention relates to organic synthesis

The invention relates to a method for producing succinic anhydride, which can find application in the chemical industry

FIELD: physics; operation.

SUBSTANCE: invention relates to the chemical industry, particularly to the automatic control systems and can be used for temperature support of the reaction mixture in chemical reactors. The system of automatic temperature profile support in the reactor with distributed constants in maleic anhydride production contains two control systems: cascade automatic control system (ACS) of coolant temperature control in the reactor and ACS of benzene-air mixture fed to the reactor where the correction signal is inleted according to reaction mixture temperature. The correction signal represents the sum of the signals about reaction mixture temperature in the measurement points positioned along the reactor height multiplied to the weight factor determined intuitively or from optimization problem solution. Then the correction signal is compared with assignment signal on the functional generator serving as algebraic adder. The invention allows to increase the temperature support accuracy in the reactor at maleic anhydride production.

EFFECT: increasing of the temperature support accuracy in the reactor.

2 cl, 2 dwg

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