Improved solvent for extraction of maleic anhydride from gas stream

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing raw maleic anhydride. In particular, method includes steps where: reactor output stream, containing maleic anhydride, is fed into bottom part of absorption column, where it comes into contact with a non-cyclic solvent, that is fed close to its upper part and is a diester, having a boiling point under normal conditions between 250 °C and 350 °C, solubility of fumaric acid at least 0.06 wt% at temperature of 60 °C, solubility of maleic anhydride at least 10 wt% at temperature of 60 °C, water solubility not higher than 100 mg/l, density, different from water density at least to 0.020 g/ml, and a water-soluble hydrolysis product with molecular weight not higher than that of pentanol, with transfer of maleic anhydride of outlet stream of reactor into a solvent, wherein gas stream to be extracted is blown off from absorption column, and enriched solvent, containing maleic anhydride, is removed from absorption column near bottom of absorber and directed into flash tower near its middle part, untreated maleic anhydride is removed from stripping column near its middle or upper part.

EFFECT: methods make it possible to use cheaper solvent than phthalates.

11 cl, 1 dwg, 1 tbl

 



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: invention relates to the use of particles consisting of a core and a shell for coating the thread or textile material with them, to restrain or prevent wicking of water into the said thread or textile material. The particles are described, consisting of a core and a shell, for restraining or preventing the wicking of water into the thread or textile material, where the said particles have an average diameter of 10-300 nm and a mean-square deviation σ which is at least 10% of the average value, in which the shell of the particle consisting of a core and a shell comprises a copolymer of a vinyl aromatic monomer and a maleimide monomer with a glass transition temperature Tg of from 120 to 220°C. Also the thread or the textile material is described, containing aramid threads provided with a finish preparation containing diglyceride or triglyceride obtained from glycerol which is esterified with saturated or unsaturated fatty acids containing 6-20 carbon atoms, where the finished thread or textile material is provided with the above mentioned particles.

EFFECT: prevention of wicking of water in the textile material.

12 cl, 1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: method includes forming, on a surface, a coating from a dimethylalkylbenzylammonium chloride complex containing a C10-C14 alkyl group or a mixture of C8-C16 alkyl groups with a copolymer of styrene and maleic anhydride, which is subjected to preliminary chemical modification to open anhydride rings to form carboxyl groups, 50-60% of which are neutralised to form carboxylate groups, or a mixture of said complex with polyvinyl butyral, in the following ratio, wt %: antiseptic polymer complex 25-40, polyvinyl butyral 60-75.

EFFECT: full prolonged protection of articles made of aluminium alloy from fouling by microorganisms, which prevents corrosive change of the surface of said alloys.

28 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing block-copolymers which contain a reactive functional group. Described is a method of producing a block-copolymer, involving: a) reaction of an acrylic monomer, having functional groups which are epoxy, acid, anhydride, amine, amide and hydroxy groups, and one or more vinyl monomers in the presence of a free-radical initiator a stable free radical at the first step to obtain a reaction product which contains a residual unreacted acrylic monomer; and b) reaction at the second step of one or more vinyl monomers with the reaction product from the first step to obtain a second block which contains a residual unreacted acrylic monomer. Also described are versions of said method of producing a block-copolymer. Described is a block-copolymer obtained using said methods, containing: a) a first block which contains monomer links of a functionalised acrylic monomer, having functional groups which are epoxy, acid, anhydride, amine, amide and hydroxy groups, and monomer links of a vinyl monomer; and b) a second block which contains monomer links of one or more vinyl monomers and monomer links of a functionalised acrylic monomer, having functional groups which are epoxy, acid, anhydride, amine, amide and hydroxy groups in the first block. Described is a thermoplastic polymer composition which is used to obtain materials with high impact resistance and mechanical strength, which contains: (a) 1-98 wt % of a first thermoplastic, having functional groups selected from a group consisting of amine, amide, imide, carboxyl groups, carbonyl, carbonate ester, anhydride, epoxy, sulpho, sulphonyl, thionyl, sulphydryl, cyano and hydroxy; (b) 0.01-25 wt % of said block-copolymer, which contains a functional group which is capable of reacting with the functional group in the thermoplastic; and (c) 1-98 wt % of a second thermoplastic polymer which is miscible or compatible with the second block of said block-copolymer.

EFFECT: obtaining block-copolymers which can be used as reactive compatibility agents of thermoplastic mixtures of polymers.

31 cl, 10 dwg, 14 tbl, 56 ex

FIELD: chemistry.

SUBSTANCE: invention relates to emulsifying polymers and use of these polymers for stable emulsification of hydrophobic additives in aqueous concrete plasticisers. Disclosed is a polymer P, obtained via copolymerisation (a) of at least one ethylenically unsaturated monomer A selected from a group consisting of unsaturated mono- and dicarboxylic acids, sulphonic acids, phosphonic acids in form of free acids or salts or partial salts or halide or anhydride, with (b) at least one ethylenically unsaturated monomer B of formula ,

or ,

where radicals and coefficients are as described in the claim and (c) with at least one ethylenically unsaturated monomer C of formula

,

where radicals and coefficients are as described in the claim and with (d) at least one ethylenically unsaturated monomer D of formula

,

where radicals and coefficients are as described in the claim and optionally (e) with at least one basic ethylenically unsaturated monomer E of formula ,

where radicals and coefficients are as described in the claim and optionally (f) with at least one other ethylenically unsaturated monomer W. Use of the polymer as a plasticiser for water-curable compositions and a water-curable composition are also disclosed.

EFFECT: polymer improves quality of mortar.

19 cl, 5 tbl

The invention relates to methods of producing cross-linked copolymers of maleic anhydride with styrene, in particular the production of ammonium salts polyamide copolymer of maleic anhydride and styrene, Recoletos ethylene glycol, which is used to obtain formulations of pesticides, as well as cosmetic, pharmaceutical and veterinary products

The invention relates to methods for film-forming polymers for paints and varnishes, in particular the production of film-forming copolymer of the bottoms of the distillation of styrene (KORS) and carbonyl compounds

FIELD: chemistry.

SUBSTANCE: invention relates to emulsifying polymers and use of these polymers for stable emulsification of hydrophobic additives in aqueous concrete plasticisers. Disclosed is a polymer P, obtained via copolymerisation (a) of at least one ethylenically unsaturated monomer A selected from a group consisting of unsaturated mono- and dicarboxylic acids, sulphonic acids, phosphonic acids in form of free acids or salts or partial salts or halide or anhydride, with (b) at least one ethylenically unsaturated monomer B of formula ,

or ,

where radicals and coefficients are as described in the claim and (c) with at least one ethylenically unsaturated monomer C of formula

,

where radicals and coefficients are as described in the claim and with (d) at least one ethylenically unsaturated monomer D of formula

,

where radicals and coefficients are as described in the claim and optionally (e) with at least one basic ethylenically unsaturated monomer E of formula ,

where radicals and coefficients are as described in the claim and optionally (f) with at least one other ethylenically unsaturated monomer W. Use of the polymer as a plasticiser for water-curable compositions and a water-curable composition are also disclosed.

EFFECT: polymer improves quality of mortar.

19 cl, 5 tbl

FIELD: chemistry.

SUBSTANCE: flocculant has the following composition, wt %: partial magnesium salt of a copolymer of acrylic and methacrylic acid neutralised by 60% (with ratio of monomers: acrylic acid - 45%, and methacrylic acid - 55%) 2.4-3.5; sodium salt of a copolymer of acrylic and methacrylic acid (with ratio of monomers: acrylic acid - 35%, and methacrylic acid 65%) 3.8-5.8; polyacrylamide 1.1-1.5; water - the balance. The flocculant is used in form of process solutions with concentration 0.015-0.035 wt %. 0.035% aqueous flocculant solutions have the highest flocculating power.

EFFECT: flocculant has high solubility in water and ensures high efficiency when used to clarify waste water.

6 ex

FIELD: chemistry.

SUBSTANCE: method is described for preparing aqueous solutions of copolymers, involving a fundamental step for copolymerisation of partially neutralised acrylic and maleic acid in the presence of hydrogen peroxide in amount of 2 to 4% of total mass of monomers at temperature ranging from 85 to 105°C in an aqueous medium, which is realised through gradual addition of an aqueous solution of hydrogen peroxide for 3 to 6 hours into an aqueous solution of partially neutralised maleic acid and simultaneous gradual addition of an aqueous solution of partially neutralised acrylic acid, or an aqueous solution of free acrylic acid, or aqueous solutions of free acrylic acid and a base, and subsequent addition of hydrogen peroxide for 30 to 60 minutes after completion of simultaneous addition of hydrogen peroxide and acrylic acid, and a step for pre-polymerisation by keeping the reaction mixture at polymerisation temperature, distinguished by that, the pre-polymerisation step is realised by keeping the reaction mixture at polymerisation temperature for 35 to 60 minutes, subsequent simultaneous addition of aluminium or potassium persulphate in amount ranging from 0.10 to 0.15% of total mass of monomers and subsequent keeping at polymerisation temperature for 45 to 90 minutes.

EFFECT: increased dispersion capacity of copolymers.

1 cl, 1 tbl, 8 ex

The invention relates to the chemistry of the modified polymers, specifically to a new sodium salt of a copolymer of acentrella and maleic anhydride (SPAN-MA), and can be used in the chemical industry, including for the separation of mixtures of metal ions, as well as for deposition and codeposition of metals

The invention relates to the field of polymer technology, namely a process for the production of latexes of copolymers of vinylidenechloride (VDH), used in the manufacture of latex paints (VDK), polymer compositions may be used to produce frost-resistant latex copolymers VDH with vinyl chloride (I) unsaturated carboxylic acid (maleic, fumaric, taconova)

FIELD: chemistry.

SUBSTANCE: invention relates to bio-compatible conjugated polymer nanoparticle, dicarbonyl-lipid compound, compound in form of vesicles, micelles or liposomes, containing multitude of nanoparticles, including said dicarbonyl-lipid compound, method of treating cancer or metastases, biocompatible polymer, as well as to conjugate. Biocompatible conjugated polymer nanoparticle includes main chain of copolymer, with at least one polymer monomer containing two side chains, selected from the group, consisting of carboxylic acid, amide and ester, and sad side chains are separated from each other by 1-1- carbon atoms, oxygen atoms or sulphur atoms, or their any combinations. Said nanoparticle further contains multitude of side chains, covalently bound with said main chain, with said side chains being selected from the group, consisting of monosaccharides, dicarboxylic acids, polyethyleneglycol and their combinations; and multitude of platinum compounds, dissociatedly bound with said main chain. Multiple platinum compounds are connected with said main chain via at least one coordination bond between carbonyl oxygen of carbonyl or amide group of main chain and platinum atom of platinum compound. Said platinum compound is selected from Pt(II) compounds, Pt(IV) compounds and any their combinations. Invention is also aimed at dicarbonyl-lipid compounds, in which platinum compound is dissociatedly bound with dicarbonyl compound. Invention is also aimed at method of treating cancer and metastases. Methods include selection of subject, requiring treatment of cancer or metastases, and introduction to subject of effective amount of nanoparticles, compounds or compositions of the invention.

EFFECT: obtaining biocompatible conjugated polymer nanoparticles for chemotherapeutic platinum-based preparation.

40 cl, 1 tbl, 29 dwg, 12 ex

FIELD: chemistry.

SUBSTANCE: maleinised tall oil-based adhesive additive contains 10-30 wt % bound maleic anhydride. The tall oil used for maleinisation contains resin and fatty acids in weight ratio of 1.0:0.6-5.0, respectively. The adhesive additive is characterised by dynamic viscosity of 0.3-1.0 Pa·s. The additive can be easily batched and has good distribution in the polymer-bitumen composition. Use of the additive does not require premixing thereof with a thermoplastic elastomer, enabling preparation of the polymer-bitumen composition in a single step.

EFFECT: polymer-bitumen composition containing an adhesive additive, characterised by high adhesion to both alkaline and acidic mineral filler.

2 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: method is realised by heterogeneous catalytic oxidation of carbon by molecular oxygen, selected from group of benzol, n-butane, n-butene, in presence of catalyst, which contains vanadium, phosphorus and oxygen, which includes: (a) maleic acid anhydride absorption from impure mixture of products by absorbing agent, which contains organic solvent, in absorption column; (b) desorption of maleic acid anhydride from absorbing agent, which is obtained at stage (a), enriched by maleic acid anhydride, in desorption column; as well as (c) total or partial return to stage (a) of absorbing agent, depleted at stage (b) by content of maelic acid anhydride, is differ in fact, that (d) total or partial quantity of absorbing agent, depleted on stage (b) by content of maelic acid anhydride, for required sedimentation of fumaric acid is cooled and/or subjected to concentration by evaporating absorbing agent to such degree, that difference between concentration of fumaric acid in reverse flow at output from desorption column c (FA, at output from desorption column) at there existing conditions, expressed in weight p/mln, and balanced concentration of fumaric acid, corresponding to solubility curve, after cooling and/or evaporation of absorbing agent part c (FA, balanced, after cooling/steaming), expressed in weight p/mln, constitutes value larger or equal 250 wt, p/mln, and for sedimentation and separation of fumaric acid applied is reservoir with built-in nozzle elements, and average time of staying in reservoir with built-in nozzle elements constitues from 0.05 to 6 hours; (e) fumaric acid, precipitated in form of solid substance due to operations at stage (d), totally or partially, in continuous or periodic mode is removed from reverse flow of absorbing agent; and (f) depleted by content of fumaric acid absorbing agent from stage (e) totally or partially returns on stage (a).

EFFECT: reduction of formation of fumaric acid sedimentations with obtaining maelic acid anhydride.

12 cl, 3 dwg, 5 ex

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

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 35-70°C 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 325-500°C 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 60-65°C and then cooling to 53-54°C and filtering at temperature of 51.5-53°C. 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

Up!