Method for preparing styrene

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of styrene. At the first step the method involves interaction of ethylbenzene hydroperoxide with propene in the presence of catalyst to yield propylene oxide and 1-phenylethanol followed by separate treatment of reaction flow and removing propylene oxide. At the second step the method involves interaction of 1-phenylethanol-containing distillate with a heterogenous dehydration catalyst at temperature 150-320°C to obtain styrene. Distillate contains 0.30 wt.-%, not above, compounds of molecular mass at least 195 Da. Invention provides decreasing the content of by-side compounds in styrene and to enhance it's the conversion degree.

EFFECT: improved method of synthesis.

3 cl, 3 tbl

 

The present invention relates to a method for production of styrene, which is in contact with the catalyst feedstock containing arrowy alcohol, more specifically, the feedstock containing 1-phenylethanol (also known under the names α-phenylethanol, or methylphenylcarbinol) and/or substituted 1-phenylethanol.

Well-known way in which arrowy alcohol is subjected to chemical conversion using the catalyst, is the way in which ethylbenzene receive propylene oxide and styrene. In General, this method involves the following stages (i) interaction of ethylbenzene with oxygen or air with getting ethylbenzothiazoline, (ii) interaction thus obtained ethylbenzothiazoline with propene in the presence of an epoxidation catalyst to obtain propylene oxide and 1-phenylethanol and (iii) the conversion of 1-phenylethanol in styrene by dehydration using a suitable dehydration catalyst.

Another well-known method comprises the production of propylene oxide by using cumene. In this way the hydroperoxide reacts with oxygen or air with getting cumonherface. Thus obtained cumonherface enter into reaction with propene in the presence of an epoxidation catalyst to obtain propylene oxide and 2-phenylpropanol. Pic the one you can turn into cumene using a heterogeneous catalyst and hydrogen. Suitable methods are described, for example, in WO 02/48126.

It was found that upon receipt kilowog alcohol produces by-products. Such byproducts can be dimers and trimers kilowog alcohol, such as bis(arylalkylamine) esters. The way in which use ethylbenzene were found, the main part of the formed bis(arylalkyl) ester is bis(α,α-phenethyl) ether, which presumably formed as a result of the reaction between two molecules of 1-phenylethanol. These side products, such as dimers and trimers, it is difficult to separate from kilowog alcohol as they can also be formed during the separation. In the past, the presence of these side products in arjavam alcohol was not paying much attention.

In the known method, described in US-A-3,351,635, in General terms describes the distillation kilowog alcohol-containing reaction mixture. In the examples, the fraction of the cubic distillation residue was subjected to dehydration. Fraction VAT residue will contain significant quantities of heavy by-products. In the way from GB-A-1,127,987 in the conditions in which operate the distillation column produces a significant amount of relatively heavy compounds. A significant amount of data is relatively heavy the x connection is distilled at a distillation in the form of the head of a shoulder strap and is subjected to further processing with alpha phenylethanol, or dimethylbenzylamine alcohol. In the way from US-A-3,452,055 use an evaporator to separate the different compounds. The evaporators have an inherent tendency not to separate arrowy alcohol from dimeric and trimeric products.

Currently, it was found that the presence of small amounts of relatively heavy compounds, such as dimeric and trimeric by-products, can lead to deterioration of the quality of the product obtained at the subsequent stage of the method. In accordance with the observations of the products contained significantly more severe connection, if the raw materials contain small amounts of relatively heavy compounds.

Therefore, the present invention thus relates to a process for the preparation of propylene oxide, including:

(1) the interaction of ethylbenzothiazoline and/or cumonherface with propene with obtaining propylene oxide and 1-phenylethanol and/or 2-phenyl-2-propanol; and

(2) contacting a feedstock containing 1-phenylethanol and/or 2-phenyl-2-propanol obtained in stage (1), in contact with a heterogeneous catalyst at elevated temperature,

where the feedstock for the stage (2) contains at most of 0.30 wt.% compounds with a molecular mass at least equal to 195.

Raw materials intended for use in the present methods is e, get at the previous stage epoxidation, in which the hydroperoxide is introduced into reaction with propene with obtaining propylene oxide. As mentioned above, hydroperoxides, which are usually used are cumonherface and ethylbenzonitrile. At this stage epoxidation you can use a homogeneous catalyst or a heterogeneous catalyst. As homogeneous catalysts are often used molybdenum compounds, while catalysts based on titanium deposited on the carrier based on silicon dioxide are often used as heterogeneous catalysts. The conditions under which conduct epoxidation, state of the art known, and they include a temperature in the range from 75 to 150°C and pressure up to 80 bar. The reaction medium is preferably in a liquid state. The product stream from the stage epoxidation is usually initially processed, leading to separation with removal of the formed propylene oxide, after which the remaining stream containing arrowy alcohol, in a suitable case is subjected to one or more additional processing, leading to separation. During such optional overtime, leading to separation, you can remove alkylaryl for reuse at an earlier stage of pic is BA.

In the method corresponding to the invention, compounds with a molecular mass at least equal to 195, separated from the stream containing arrowy alcohol. Compounds that separate, generally will have a molecular weight in excess of 195. More preferably, when the feedstock of the present invention contains, at most, to 0.30 wt.% compounds with a molecular mass at least equal to 200. Examples of such compounds are dimers and trimers alkylaromatic parent compounds and dimers and trimers arolovich alcohols. The amount of data of the dimers and trimers preferably less than the amounts specified hereinafter in the present invention. If allowin alcohol is 1-phenylethanol, the amount of bis(α,α-phenethyl) ether preferably will be below specified amounts. If allowin alcohol is 2-phenylpropanol, the amount of bis(2,2-phenylpropionic) ester is preferably less than these amounts.

The removal of heavy compounds you can spend in any way, known as the suitable specialist in this field of technology. Suitable methods include single evaporation and distillation. However, it is necessary to take measures to ensure that these heavy compounds would be removed to low levels required in accordance with the present invention. Usually used plumage is of PMC in General will not lead to low levels of heavy compounds, required. Connections must be removed so that the original raw materials, including arrowy alcohol, would contain most of 0.30 wt.% data heavy compounds, more preferably less than 0,30 wt.% data heavy compounds, more preferably at most 0.25 wt.% data heavy compounds, more preferably at most of 0.20 wt.% data heavy compounds, more preferably less than 0,20 wt.% data heavy compounds, more preferably at most about 0.15 wt.%, more preferably smaller than 0.15 wt.%, more preferably at most 0.10 wt.%, more preferably less than 0.10 wt.%, more preferably at most 0.08 wt.%, most preferably less than 0.08 wt.%.

The amount of heavy compounds remaining in the feedstock, in the General case will be equal to at least about 0.001 wt.%, more specifically, at least 0.005 wt.%, speaking most specifically, at least 0.01 wt.%.

A preferred method for removal of heavy compounds in accordance with the requirements relevant to the present invention, includes distillation. The feedstock containing arrowy alcohol, preferably subjected to distillation, where in the course of this distillation is distilled arrowy alcohol, and heavy compounds are removed in the form of the cubic product. CBM produced data FPIC is BOM, in an appropriate case can be subjected to further transformation, for example, using cracking. Such processing is described in the work of EP-A-1056697. The distillate containing arrowy alcohol, is a preferred feedstock for use in the present invention.

A preferred method for conversion of a feedstock containing arrowy alcohol, includes dehydration. This method is well-known state of the art. It can be implemented as in the gas phase and in the liquid phase. Suitable dehydration catalysts include, for example, acidic materials such as aluminum oxide, alkaline aluminum oxide, aluminum silicate and synthetic zeolites H-type. Conditions of dehydration is also well known, and they typically include a reaction temperature of 150-250°for liquid-phase dehydration and 210-320°With typical 280-310°for gas-phase dehydration. Pressure usually are in the range of from 0.1 to 10 bar. In principle, the method corresponding to the present invention, it is possible to use any known method of dehydration. For the purpose of the present invention, the preferred gas-phase dehydration. In a preferred embodiment, the implementation of gas-phase dehydration is carried out at a temperature in the range from 250 to 320°using catalyst dehydration on the basis of the e aluminum oxide.

Methods that are particularly suitable for the conversion kilowog alcohol in alkynylaryl, have been described in WO 99/58480. Such methods for producing styrene include gas-phase dehydration of 1-phenylethanol at elevated temperature in the presence of a dehydration catalyst, where the catalyst dehydration consists of a molded catalyst particles on the basis of aluminum oxide with a specific surface area (the method of brunauer-Emmett-teller) in the range from 80 to 140 m2/g and pore volume (mercury method) in the range from 0.35 to 0.65 ml/g, of which from 0.03 to 0.15 ml/g refers to pores with a diameter at least equal to 1000 nm.

Another method that can be used is described in the work WO 99/42425. These methods of obtaining styrene or substituted styrene include gas-phase dehydration of 1-phenylethanol or substituted 1-phenylethanol in the presence of a solid acid catalyst containing a zeolite and a binder material, where the mass ratio of zeolite and binder is in the range from 1:99 to 90:10, and where the following relationship:

0 < K < 5(1)

c:

K = V/S * [(Pz * fz) + (Pb * fb)]1/2(2)

where V/S is the ratio of the volume of the surface used for the catalyst in mm;

fz represents the mass fraction of zeolite present in the catalyst in grams of zeolite per gram of catalyst;

fb represents the mass fraction of binder present in the catalyst in grams of binder per gram of catalyst;

Pz is a characteristic of the productivity of the zeolite, expressed in grams of styrene, obtained on a single gram of zeolite per hour, when conducting the measurements for pure samples of zeolite with a small particle size (i.e., < 0.1 mm) at the temperature used in gas-phase dehydration, and when the degree of conversion of 1-phenylethanol in styrene, less 80%; and

Pb is a characteristic productivity binder, expressed in grams of styrene, obtained on one gram of the binder for one hour, when conducting the measurements for pure samples of the binder with a small particle size (i.e., < 0.1 mm) under the same conditions as used to determine the Pz.

The product of the method of the present invention in General will be any alkynylaryl or alkylaryl. Received the product before the introduction of subsequent reactions in the General case will be processed, leading to separation. Preferably in a way consistent with the present invention, is a method of dehydration. Read the t of this method will contain alkynylaryl, more specifically, the styrene. This product will generally be divided into a fraction enriched with alkynylaryl, which will also contain water of dehydration, and the tail fraction. This separation can be done in several ways, but the most appropriate variant, it is achieved by a single evaporation or distillation. This separation of the fraction enriched with alkynylaryl will be removed in the form of fractions of the distillate, while the tail fraction containing heavy shoulder straps formed during dehydration will receive a fraction of the cubic residue.

Despite the fact that the method corresponding to the present invention yields a product which contains a relatively small amount of heavy compounds, it may be advantageous to subject the product of the present invention the processing according to the method described in EP-A-1056697. The way EP-A-1056697 involves the following stages:

(a) dehydration of raw materials, containing 1-phenylethanol or substituted 1-phenylethanol in the presence of a suitable dehydration catalyst,

(b) separating the resulting product stream with obtaining, thus, the stream containing styrene or substituted styrene and a tail fraction containing heavy shoulder straps, and

(C) transforming at least an hour and these heavy straps in styrene or substituted styrene by cracking thread containing these heavy shoulder straps, in the presence of an acid catalyst cracking.

The invention optionally further illustrated by the following examples without limiting its scope data specific implementation options.

Example 1

In the reactor blew air through ethylbenzene. The product contained ethylbenzonitrile. This product was mixed with a solution containing NaOH. After this neutralized mixture was washed with water. The obtained product was introduced into a reaction with propene in the presence of titanium oxide deposited on the catalyst based on silica, as described in the example, the relevant provisions of the work EP-A-345856. Unreacted ethylbenzene was removed in the distillation. After this distillation was subjected to the product. Received various distillates depending on the manner in which conducted distillation. Table 1 describes the distillate.

Table 1
1Comparative2
1-phenylethanol79,0077,3076,93
2-phenylethanolof 3.463,342,31
The acetophenoneup 11,8612,1713,68
Other compounds with Mw< 1955,646,837,03
Compounds with Mw≥ 1950,040,360,05

The feedstock described in table 1, was subjected to processing by the method described in example 1 from WO 99/58480. In this way 1-phenylethanol is subjected to dehydration to obtain styrene. The degree of conversion obtained for various kinds of raw materials shown in table 2. The numbers represent the % degree of conversion of 1-phenylethanol in raw materials.

Table 2
Time (hours)Feedstock 1Comparative raw materialsThe feedstock 2
8,599,5199,2399,52
a 21.5of 99.7599,2099,52
34,599,73a 99.1699,41
47,599,6399,24

The number of heavy products of compounds with Mw≥ 195 present in products derived from these types of raw materials shown in table 3. The above quantities are wt.% in races is to know the number of the obtained styrene.

Table 3
Time (hours)Feedstock 1Comparative raw materialsThe feedstock 2
8,53,064,103,59
a 21.53,374,483,50
34,53,28of 5.063,44
47,53,233,30

1. The method of producing styrene, including

(1) the interaction of ethylbenzothiazoline with propene in the presence of a catalyst to obtain propylene oxide and 1-phenylethanol and separation processing of the reaction stream with removal of propylene oxide and

(2) the contacting of the distillate containing 1-phenylethanol obtained in stage (1) with a heterogeneous dehydration catalyst at a temperature of 150-320°obtaining styrene,

where the distillate from step (2) contains at most of 0.30 wt.% compounds with a molecular mass at least equal to 195.

2. The method according to claim 1, characterized in that the distillate contains at least about 0.001 wt.% compounds with a molecular mass at least equal to 195.

3. The method according to claim 1 or 2, characterized in that the heterogeneous catalyst de is gratzii on stage (2) is the catalyst based on aluminum oxide.



 

Same patents:

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to technology of epoxidation of unsaturated compounds with hydrogen peroxide, in particular to production of propylene oxide and propylene glycol. Epoxidation is conducted in presence of organic solvent and catalytically active compound including zeolite catalyst. Product mixture contains propylene oxide, unreacted propylene, and α-hydroperoxypropanols, which are reduced with hydrogen into corresponding propylene glycols. As organic solvent, alcohols, preferably methanol, or their mixtures with water are used. Propylene oxide as well as unreacted propylene and solvent are separated by distillation at column vat temperature below 80°C and residence time less than 4 h. Hydrogenation catalyst is selected from group comprising heterogeneous catalysts containing as active metal Ru, Ni, Co, Pd, and Pt, individually or as two- or more-component mixture on suitable carrier.

EFFECT: enabled processing of hydroxyperoxyalcohol, epoxidation reaction by-product, into glycols so improving economical characteristics of the process.

15 cl, 3 ex

FIELD: organic chemistry, chemistry of terpene compounds.

SUBSTANCE: invention relates to a method for synthesis of 2,10-epoxypinane (β-pinene epoxide). Method involves epoxidation of β-pinene double bond with diluted hydrogen peroxide in an aqueous solution of polar solvents (methanol, N,N-dimethylformamide or acetonitrile) under condition of catalytic effect of manganese sulfate in the presence of sodium hydrocarbonate and salicylic acid. Then epoxide and β-pinene are extracted with aliphatic solvent from the reaction mixture. Polar and aliphatic solvents can be used repeatedly. At final step 2,10-epoxypinane is isolated from crude epoxide by distillation under vacuum with purity degree 95% and the yield 60-70%. Invention provides the development of technological method for synthesis of intermediate compound used in preparing some medicinal, technical and perfume preparations.

EFFECT: improved method of synthesis.

7 ex

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to production of alkylaryl hydroperoxides useful as starting material in production of propylene oxide and alkenylaryl. Process of invention comprises following stages: oxidation of alkylaryl compound to form reaction product containing alkylaryl hydroperoxide; contacting at least part of reaction product with basic aqueous solution; separation of hydrocarbon phase containing alkylaryl hydroperoxide from aqueous phase; containing at least part of above hydrocarbon phase with aqueous solution containing waste water, said aqueous solution containing less than 0.2% alkali metal and/or salt (determined as ratio of metal component to total amount of solution); and separation of hydrocarbon phase from aqueous phase. By bringing at least part of above hydrocarbon phase containing alkylaryl hydroperoxide into interaction with propylene and catalyst, alkylaryl hydroxide and propylene oxide are obtained. At least part of propylene oxide is then separated from alkylaryl hydroxide. Dehydration of at least part of alkylaryl hydroxide results in formation of alkenylaryl.

EFFECT: reduced amount of contaminating by-products in alkylaryl hydroperoxide preparation stage.

8 cl, 4 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for the epoxidation reaction of olefin. Method involves interaction of the parent olefin-containing raw, oxygen and an agent modifying reaction in the presence of a silver-base catalyst. Agent modifying the reaction presents in the relative amount Q that represents the ratio of effective molar amount of active parts of reaction modifying agent presenting in the parent raw to the effective molar amount of hydrocarbons presenting in the parent raw. Proposed method involves the following steps: interaction in the first stage of process wherein Q values are equal to Q1 and the following interaction in the second step of process wherein the composition of the parent raw differs from composition of the parent raw used in the first step of process and Q value is equal to Q2 wherein value Q2/Q1 = 0.5-1.5. Also, invention relates to a method for synthesis of 1,2-diol or 1,2-diol ether, system for realization of method, the end product and a computer system suitable for using with proposed method.

EFFECT: improved method of synthesis.

20 cl, 2 ex

FIELD: chemical industry; production of hydrogen peroxide and oxiranes.

SUBSTANCE: the invention is dealt with a method of production of hydrogen peroxides and oxiranes. The invention provides for conductance of reaction of olefin with hydrogen peroxide at the presence of a catalyst and organic thinner. At that hydrogen peroxide is present as a water solution of hydrogen peroxide extracted mainly with the help of purified water out of a mixture produced as a result of oxidation at least of one alkylanthrahydroquinone without aftertreatment with a cleansing water and-or purification. The technical result is an increase of an output and selectivity of oxirane.

EFFECT: the invention ensures increased output and selectivity of oxirane.

17 cl, 5 tbl, 10 ex

The invention relates to a method of improving the quality of propylene oxide contaminated with poly(propylene oxide), which includes the following stages: (a) interaction of liquid propylene oxide powder of the adsorbent in an amount of from 0.05 to 15 wt.% in relation to the mass of liquid propylene oxide consisting of a silicate of magnesium and/or calcium silicate, with taking the suspension, where the average particle size of the specified powder is from 1 to 100 μm, or deletion of contaminated propylene oxide over at least one layer of the extrudates of the same adsorbent, and (b) isolation of the pure product of propylene oxide

The invention relates to a method for selection of the ethylene oxide absorption from the gas mixture obtained in the oxidation of ethylene with oxygen in the presence of silver-containing catalyst, and can be used in the production of ethylene oxide
The invention relates to a method for oxidation of hydrocarbons in the presence of a mixture of hydrogen and oxygen on the catalyst containing 0.5-10 wt.% silver and titanium containing medium, characterized in that the catalyst contains: a) a titanium containing media, such as titansilver, titanium dioxide or mixed oxides of silicon and titanium, or mixed oxides of silicon, aluminum and titanium, (b) silver particles with an average particle size of from 0.3 to 100 nm

The invention relates to a method for selection of the ethylene oxide absorption from the gas mixture obtained in the oxidation of ethylene with molecular oxygen in the presence of silver-containing catalyst, and can be used in the production of ethylene oxide

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to method for synthesis of alkylaryl peroxide-containing compound. Method involves the following steps: (a) oxidation of alkylaryl compound to yield the alkylaryl hydroperoxide-containing reaction substance; (b) treatment of at least part of the reaction substance containing alkylaryl hydroperoxide synthesized at the step (a) wherein this the reaction product comprises less 0.05% of sodium (by mass); (c) separation of product synthesized at the step (b) for hydrocarbon phase containing alkylaryl hydroperoxide and an aqueous phase; (d) repeating steps (b) and (c) by one or some time being optionally. Also, synthesis of alkylaryl hydroxide involves the additional treatment step (e) of at least part of hydrocarbon phase containing alkylaryl hydroperoxide synthesized at steps (c) or (d), olefin and a catalyst to yield alkylaryl hydroxide and oxirane compounds, and (f) separation of at least part of oxirane compound from alkylaryl hydroxide. Synthesis of alkenylaryl involves the additional step (g) of dehydration of at least part of alkylaryl hydroxide synthesized at step (f). Invention provides simplifying the technological process resulting to synthesis of improved substance containing alkylaryl hydroperoxide from which alkylaryl hydroxide is prepared followed by preparing alkenylaryl.

EFFECT: improved method of synthesis.

11 cl, 1 tbl, 6 ex

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to production of alkylaryl hydroperoxides useful as starting material in production of propylene oxide and alkenylaryl. Process of invention comprises following stages: oxidation of alkylaryl compound to form reaction product containing alkylaryl hydroperoxide; contacting at least part of reaction product with basic aqueous solution; separation of hydrocarbon phase containing alkylaryl hydroperoxide from aqueous phase; containing at least part of above hydrocarbon phase with aqueous solution containing waste water, said aqueous solution containing less than 0.2% alkali metal and/or salt (determined as ratio of metal component to total amount of solution); and separation of hydrocarbon phase from aqueous phase. By bringing at least part of above hydrocarbon phase containing alkylaryl hydroperoxide into interaction with propylene and catalyst, alkylaryl hydroxide and propylene oxide are obtained. At least part of propylene oxide is then separated from alkylaryl hydroxide. Dehydration of at least part of alkylaryl hydroxide results in formation of alkenylaryl.

EFFECT: reduced amount of contaminating by-products in alkylaryl hydroperoxide preparation stage.

8 cl, 4 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for interaction of an organic compound with hydroperoxide. Invention describes a continuous method of interaction of organic compound comprising at least one C-C-double bond with hydroperoxide in the presence of a catalyst. Method involves interaction of organic compound at the reaction step (R1) under the range of the own pressure below 100 bars, temperature in the range 0-120°C and in the molar ratio of reacting organic compound to hydroperoxide in the range 0.7-20 with hydroperoxide in the presence of a zeolite-containing catalyst to yield at least one flow of the product (P1). Then at least one flow of the product (P1) is fed to intermediate treatment (Z1) wherein (Z1) forms at least one the hydroperoxide-containing product flow (PZ1) and wherein the intermediate treatment represents distillation separation of hydroperoxide from at least one the product flow (P1) or addition of a base to at least one the product flow (P1) and at least one the product flow is fed to at least in the reaction step (R2) wherein under pressure in the own pressure up to 100 bars, temperature in the range 0-120°C and in the molar ratio of the reacting organic compound to hydroperoxide in the range 0.7-20 hydroperoxide is subjected for interaction with an organic compound in the presence of a zeolite-containing catalyst to yield at least one the product flow (P2) wherein at least one of reaction steps (R1) and (R2) the method involves using the reactors system comprising at least two reactors joined in parallel. Also, invention describes a device for carrying out the interaction of an organic compound with hydroperoxide.

EFFECT: improved method for interaction.

9 cl

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention proposes a method for synthesis of oxirane compounds comprising the following steps: (i) oxidation of alkylaryl wherein alkyl substitute comprises from 2 to 10 carbon atoms to yield alkylaryl hydroperoxide; (ii) contacting at least part of alkylaryl hydroperoxide prepared at the step (i) with olefin at the temperature range 0-200°C and under pressure in the range 1-100 x 105 H/m2 in the presence of a catalyst comprising titanium on silicon dioxide and/or silicate to yield oxirane compound and alkylaryl hydroxyl; (iii) optional interaction of at least part of alkylaryl hydroperoxide prepared at the step (i) to yield phenol and ketone; (iv) separation of oxirane compound from the reaction product from the step (ii0, and (v) contacting at least part of the reaction product no containing oxirane with hydrogen at temperature 100-330°C and under pressure 0.1-50 x 105 H/m2 in the presence of the hydrogenation catalyst to yield alkylaryl and at least part of the latter is re-circulated to the step (i) wherein the hydrogenation catalyst represents catalyst comprising copper compound, zinc compound and at least one compound chosen from the group consisting of aluminum, zirconium, magnesium rare-earth metals and their mixtures. Invention provides the possibility for synthesis of oxirane compounds without necessity for simultaneous synthesis of other compounds.

EFFECT: improved method of synthesis.

5 cl, 7 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention proposes a method for synthesis of oxirane compounds comprising the following steps: (i) oxidation of alkylaryl to yield alkylaryl hydroperoxide; (ii) contacting at least lesser part of alkylaryl hydroperoxide prepared at the step (i) with olefin in the presence of catalyst to yield oxirane compound and alkylaryl hydroxyl; (iii) separation of oxirane compound from the reaction product from the step (ii), and (iv) contacting at least part of the reaction product no containing oxirane compound with hydrogen to yield alkylaryl and at least of part of the latter is re-circulated to the step (i) and wherein alkylaryl means an alkylaryl compound representing di-(isopropyl)-benzene. Invention provides the possibility for preparing oxirane compound without the necessity for preparing other compounds and reducing the amount of the parent alkylaryl.

EFFECT: improved method of synthesis.

3 cl

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of compounds of oxirane, phenol and ketones and/or aldehydes. Proposed method involves the following steps: (i) oxidation of alkylaryl wherein alkyl substitute comprises from 2 to 10 carbon atoms to yield alkylaryl hydroperoxide; (ii) contacting at least part of alkylaryl hydroperoxide prepared at the step (i) with olefin in the presence of catalyst to yield oxirane compound and alkylaryl hydroxyl; (iii) reaction of at least part of alkylaryl hydroperoxide prepared at the step (i) to yield phenol and ketone and/or aldehyde; (iv) separation of oxirane compound from the reaction product from the step (ii), and (v) contacting at least part of the reaction product no containing oxirane with hydrogen to yield alkylaryl and at least part of the latter is re-circulated to the step (i). Invention provides the development of the combined method for synthesis of oxirane, phenol, ketones and/or aldehydes that allows reducing the amount of by-side products due to their conversion to useful compounds.

EFFECT: improved method of synthesis.

8 cl

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention proposes a method for synthesis of organic hydroperoxide comprising the reduced amount of impurities. Method involves the following steps: (a) oxidation of organic compound to yield the reaction product comprising organic hydroperoxide; (b) contacting at least part of the reaction product comprising organic hydroperoxide with the basic aqueous solution; (c) separation of hydrocarbon phase containing organic hydroperoxide from an aqueous phase; (d) washing out at least part of the separated hydrocarbon phase containing organic hydroperoxide, and (e) contacting at least part of hydrocarbon phase containing organic hydroperoxide with a protective layer comprising a solid adsorbent wherein a solid adsorbent shows porosity 50-98% by volume. Except for, invention proposes a method for preparing oxirane compound from hydrocarbon phase obtained at the step (e) by the method described above and containing alkylaryl hydroperoxide. The presence of the protective layer reduces the pressure increment in the catalyst layer that is caused by the declined content of impurities in the raw comprising alkylaryl hydroperoxide.

EFFECT: improved preparing method.

7 cl, 2 ex

FIELD: industrial organic synthesis.

SUBSTANCE: molybdenum is recovered from catalytic olefin epoxidation products using organic hydroperoxides. Method comprises treating heavy epoxidate fraction with alkali solution, treating resultant spent alkali stream with extractant, and subsequent precipitation of molybdenum trisulfide using sulfur-alkali effluents formed in production of olefins by pyrolysis of hydrocarbon feedstock.

EFFECT: increased molybdenum recovery degree and simplified operation.

11 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention proposes method for epoxydation of olefins with ethyl benzene hydroperoxide in the presence of molybdenum-containing catalyst and nitrogen-containing compound. Derivatives of quinolines or Mannich base or their mixtures are used as nitrogen-containing compound and the mole ratio molybdenum : nitrogen-containing compound is maintained = 1:(0.05-0.4). Invention provides enhancing conversion and selectivity of the epoxydation process of olefins with organic hydroperoxides.

EFFECT: improved method for epoxydation.

3 cl, 15 ex

The invention relates to a method of producing accelerated, and more particularly to a method of producing accelerated of the alkene, which used the epoxidation reactors operate in such a way that the service life of the catalyst in the epoxidation increases significantly

FIELD: chemical engineering.

SUBSTANCE: method comprises catalytic dispersing of ethylbenzene in the presence of dehydrating agent, sulfur vapors, with sulfur/ethylbenzene mol ratio of 03-05 at a temperature of 500-595°C.

EFFECT: improved method.

10 ex

Up!