Method for obtaining ethyleneglycol

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method for obtaining ethyleneglycol from ethylene. Method includes the following stages: i) transformation of ethylene into ethylenoxide in presence of oxygen, catalyst of epoxidation and retardant in ethylenoxide reactor; ii) absorption of ethylenoxide with absorbent water solution and the following stripping of said absorbent to obtain flow of ethylenoxide water solution; iii) transformation of flow of ethylenoxide water solution into ethylenecarbonate flow in presence of one or several catalysts and carbon dioxide in one or several reactors of carboxylation; iv) transformation of ethylenecarbonate into first ethyleneglycol flow in presence of one or several catalysts in one or several hydrolysis reactors; v) removal of water from first ethyleneglycol flow to obtain dehydrated ethyleneglycol flow and wasted water flow in one or several dehydration columns; vi) purification of dehydrated ethyleneglycol flow in one or several ethyleneglycol distillation columns to obtain flow of purified ethyleneglycol product and recirculation catalyst flow. First ethyleneglycol flow contains inorganic chloride admixtures, and method includes the following additional stages: vii) transformation of inorganic chloride admixtures into 2-chloroethanol by reaction with ethylenoxide in one or several dehydration columns and viii) removal of 2-chloroethanol in wasted water flow.

EFFECT: claimed method makes it possible to reduce or eliminate necessity in catalyst discharge.

10 cl, 2 dwg, 1 tbl, 1 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method includes the following stages: a. hydration of lactides, where metal-catalysed heterogeneous catalysis is performed in presence of hydrogen with obtaining non-purified product, containing propane-1,2-diol, and b. dynamic kinetic separation of racemates, in which optically pure propane 1,2-diol is obtained in range ≥ 99% e.e.

EFFECT: improvement of compound properties.

23 cl, 4 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: claimed invention relates to a method of converting glycerol into propyleneglycol, applied as a "pollution-free" non-toxic antifreeze and chemical de-icer. The method consists in the hydrogenation of glycerol in the presence of a catalyst and includes the following stages: preliminary heating of a raw material mixture, which contains glycerol, hydrogen and methanol, in a reagent heater, supply of the heated raw material mixture into the reactor, separation of the flow, output from the reactor, into a vapour phase flow and a liquid phase flow, condensation of the vapour phase flow with obtaining a condensed liquid, return of the condensed liquid into the cycle in the reactor and distillation of the liquid phase flow with obtaining of purified propyleneglycol.

EFFECT: claimed method makes it possible to obtain the target product with high selectivity.

10 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of continuous obtaining of dialkylcarbonate of formula (I): (R1O)2CO (I), in which R1 stands for a non-branched or branched alkyl with 1-4 atoms of carbon, and alkyleneglycol of formula (II): R2(OH)2 (II), in which R2 stands for an alkyl with 2-4 carbon atoms, by the realised in the presence of a catalyst re-etherification of cyclic alkylenecarbonate of formula (III): (III): R1OH (III), in which R1 is such as given above, with the re-etherification being realised in a column in a counter-flow mode, with cyclic alkylenecarbonate (1) being supplied into an upper part of the column, and dialkylcarbonate-containing alcohol (3) - into its middle or lower part, and below the place of supply of dialkylcarbonate-containing alcohol other place of the alcohol-containing flow (4) supply is provided, with a ratio of distance between the place of alkylenecarbonate (1) supply and the place of dialkylcarbonate-containing alcohol (3) supply to the distance between the place of alkylenecarbonate (1) supply and the second place of alcohol (4) supply constitutes from 0.2 to 0.52.

EFFECT: method makes it possible to obtain products with the maximally low content of alkylenecarbonate.

13 cl, 4 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: target product represents 1,2-epoxydodecane and combined with it 1,2-dodecanediol, in a weight ratio of 3:1. The catalytic oxidation of 1-dodecen with sodium hypochlorite is carried out with the application of the catalyst KBr for 10 h in the presence of a solvent - acetonitrile, with a volume ratio 1-dodecene:acetonitrile, equal to 1:8÷15.

EFFECT: increased rate of carrying out the reaction and an increase of the target product output.

3 dwg, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkanediol and dialkyl carbonate, which includes: (a) reacting alkylene carbonate and alkanol in the presence of a re-esterification catalyst to obtain a reaction mixture containing dialkyl carbonate, unconverted alkanol, alkanediol and unconverted alkylene carbonate; (b) distilling the reaction mixture in a first distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing dialkyl carbonate, alkanol, alkanediol and alkylene carbonate; (c) distilling the bottom stream from the first distillation column in a second distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing alkanediol and alkylene carbonate; (d) extracting alkanediol from the bottom stream of the second distillation column and (e) distilling the upper streams of the first and second distillation columns in a third distillation column to obtain an upper stream containing alkanol, and a bottom stream containing dialkyl carbonate.

EFFECT: method enables to obtain dialkyl carbonate using a more energy-efficient method.

10 cl, 2 dwg, 4 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of distilling an aqueous polymethylol mixture containing a polymethylol of formula

,

a tertiary amine, water, as well as an adduct of a tertiary amine and formic acid (amine formate). According to the disclosed method, distillation is carried out in a distillation column equipped with a condenser, the lower part of the column being connected to an evaporator, wherein temperature in the lower part of the column is higher than the evaporation temperature of the monoether of formic acid and polymethylol (polymethylol formate) formed during the distillation process. In formula (I), R in each case independently denotes another methylol group or an alkyl group with 1-22 carbon atoms or an aryl or aralkyl group with 6-22 carbon atoms.

EFFECT: method enables to obtain polymethylols with low content of polymethylol formate.

14 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of purifying raw polymethylol, which contains polymethylol of formula (I), as well as a hydroxy acid of formula (IV). According to the present method, raw polymethylol is obtained in a multistep process, wherein at step (a) alkanals react via aldol condensation with formaldehyde in the presence of tertiary amines as catalyst to form methylol alkanals of formula (II). Further, at step (b), the reaction mixture obtained at step (a) is divided by distillation into a still residue primarily containing compounds of formula (II) and a head stream containing low-boiling components. The stream coming from the bottom from step (b) is hydrogenated at step (c). The stream coming from step (c) is then distilled at step (d). Low-boiling components from the stream coming from step (c) are separated, and purification is carried out in a distillation column, wherein the bottom of the distillation column is connected to at least one evaporator with a short dwell time. In formulae , , R in each separate case independently denotes a methylol group or an alkyl group with 1-22 carbon atoms or an aryl group or an arylalkyl group with 6-22 carbon atoms.

EFFECT: method reduces losses in output of polymethylol.

12 cl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a mesoporous carbon supported tungsten-carbide catalyst for direct catalytic conversion of cellulose to ethylene glycol, wherein the support is mesoporous carbon. The tungsten-carbide catalysts are dispersed on the surface or in channels in the carbon support. The metal component W ranges from 1 to 80 wt % of the catalyst and particularly from 30 to 42 wt %. The invention also relates to a method of producing a catalyst by impregnating a mesoporous carbon support with a tungsten and nickel or tungsten salt solution and use of the catalyst.

EFFECT: obtaining a catalyst for converting cellulose to ethylene glycol with high output and selectivity.

10 cl, 3 dwg, 3 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining diphenylcarbonate includes a reaction of carbon dioxide and epoxide in the first reaction zone with the formation of the first reaction product, which includes cyclic carbonate; reetherification of cyclic carbonate with ethanol in the presence of a catalyst of the first reetherification in the second reaction zone with the formation of the second reaction product, which includes diethylcarbonate and glycol; separation of the second reaction product with the extraction of the first fraction of diethylcarbonate and the first fraction of glycol; reetherification of, at least, a part of the first fraction of diethylcarbonate with arylhydroxycompound in the presence of a catalyst of the second reetherification in the third reaction zone with the formation of the third reaction product, which includes ethylarylcarbonate and ethanol; separation of the third reaction product with the extraction of ethylarylcarbonate fraction and the first fraction of ethanol; disproportioning of, at least, a part of ethylarylcarbonate fraction in the presence of a catalyst of disproportioning in the fourth reaction zone with the formation of the fourth reaction product, which includes diarylcarbonate and diethylcarbonate; separation of the fourth reaction product with the extraction of diarylcarbonate fraction and the second diethylcarbonate fraction; recirculation of, at least, a part of the first ethanol fraction into the second reaction zone and recirculation of, at least, a part of the second diethylcarbonate fraction into the third reaction zone. Or a method of diarylcarbonate obtaining includes a reaction of ammonia and carbon dioxide in the first reaction zone with the formation of the first reaction product, which includes urea; reetherification of urea with ethanol in the presence of a catalyst of the first reetherification in the second reaction zone with the formation of the second reaction product, which includes diethylcarbonate and ammonia; separation of the second reaction product with the extraction of the first fraction of diethylcarbonate and the first fraction of ammonia; reethrification of, at least, a part of the first fraction of diethylcarbonate with arylhydroxycompound in the presence of a catalyst of the second reetherification in the third reaction zone with the formation of the third reaction product, which includes ethylarylcarbonate and ethanol; separation of the third reaction product with the extraction of the ethylarylcarbonate fraction and ethanol fraction; disproportioning of, at least, part of the ethylarylcarbonate fraction in the presence of a catalyst of disproportioning in the fourth reaction zone with the formation of the fourth reaction product, which includes diarylcarbonate and diethylcarbonate; separation of the fourth reaction product with the extraction of the diarylcarbonate fraction and the second fraction of diethylcarbonate; recirculation of, at least, a part of the ethanol fraction into the second reaction zone and recirculation of, at least, a part of the second diethylcarbonate fraction into the third reaction zone. Disclosed methods efficiently combine into one the whole production of diethylcarbonate and diarylcarbonate, eliminating the necessity of extraction distillation with a solvent, which is usually applied in the production of diarylcarbonates from dimethylcabonate, providing a combination of reaction and separation equipment and best use of the raw material and reducing production costs and capital investments for such methods. In some versions of realisation the methods disclosed in the invention can be realised, for instance, with a practically closed cycle for ethanol.

EFFECT: invention relates to the methods of obtaining diarylcarbonates, which make it possible to obtain diarylcarbonates from gases, causing the greenhouse effect, such as carbon dioxide.

29 cl, 24 dwg, 9 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: propanediol-oxydoreductase coding gene is introduced into an E.coli cell, which makes it possible to produce high levels of 1,2-propanediol, in fact, without 1,3-propanediol, with growing on glycerol as the only carbon source. Genes of glycerol dehydrogenase (gldA), dihydroxyacetone kinase (dhaK) and/or methylglyoxal synthase (mgsA) can be additionally inserted to express the said enzymes together with propanediol-oxydoreductase (fucO), as well as a gene of glycerol dehydratase or aldo-keto reductase in order to express the said glycerol dehydratase or aldo-keto reductase together with propanediol-oxydoreductase. The E.coli cell, transformed by the propanediol-oxydoreductase coding gene, can be defective in arabinose, methylglyoxal and/or dihydroxyacetonephosphate metabolism.

EFFECT: invention relates to the field of genetic engineering and can be used for recombinant production of 1,2-propanediol (1,2-PD).

9 cl, 4 dwg, 9 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of reducing concentration of aldehyde in the crude stream of a carbonylation process, involving feeding a crude stream containing a carbonylatable agent selected from a group consisting of methanol, methyl acetate, methyl formate and dimethyl ether or mixture thereof, having primary concentration of aldehydes; and reaction thereof in gaseous phase with a deposited catalyst which contains at least one metal from group 8 to 11, in conditions which facilitate reduction of primary concentration of aldehydes to secondary concentration of aldehydes.

EFFECT: method improves degree of reduction of aldehyde.

28 cl, 3 tbl, 3 ex

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for synthesis of 1,3-propanediol involving the following steps: (a) formation of aqueous solution of 3-hydroxypropanal; (b) hydrogenation of 3-hydroxypropanal to form crude mixture of 1,3-propanediol, water and cyclic acetal of molecular mass 132 Da (MW 132 cyclic acetal) and/or cyclic acetal of molecular mass 176 Da (MW 176 cyclic acetal); (c) distillation (drying) of indicated crude mixture of 1,3-propanediol for water removing and formation of the second crude mixture of 1,3-propanediol (the first flow of residues after distillation) containing 1,3-propanediol and MQ 132 cyclic acetal and/or MW 176 cyclic acetal; (d) contact of the flow containing MW 132 cyclic acetal and/or MW 176 cyclic acetal with acid-base cation-exchange resin or with acid zeolite, or with soluble acid, and (e) removal of MW 132 cyclic acetal. Method provides enhancing effectiveness for extraction and purification of 1,3-propanediol.

EFFECT: improved method of treatment.

10 cl, 9 tbl, 1 dwg, 6 ex

FIELD: chemical industry; method of production of the alkali-resistant and thermal-resistant polyols.

SUBSTANCE: the invention is pertaining to the improved method of production of the alkali- resistant and thermal-resistant polyols representing the sugar-alcohol syrups. The method provides for the following stages: hydrogenation of the hydrolysate of the corresponding polysaccharide with formation of the hydrogenated sugar-alcohol syrup, the alkaline and thermal treatment of the hydrogenated syrup for production of the stabilized sugar-alcohol syrup, refining of the stabilized sugar-alcohol syrup by its gating through, at least, one ion-exchange resin, in which the stabilized sugar-alcohol syrup is refined by means of its double gating through the cationic- anionic ion-exchange configuration (CACA) including, at least, the first weak-acid cationic ion-exchange resin and the second strongly-base, medium-base or weak-base anion-exchanging resin. The method allows to have the alkali-resistant and thermal-resistant polyols not having the shortcomings of the polyols of the previous level of the engineering.

EFFECT: the invention ensures production of the alkali-resistant and thermal-resistant polyols not having the shortcomings of the polyols of the previous level of the engineering.

18 cl, 3 ex, 1 dwg

The invention relates to an improved process for the preparation and purification of synthetic ethanol produced by the direct hydration of ethylene

The invention relates to the processing of glycerin produced during the breakdown of fats or synthetic method, and can be used in cosmetic, chemical and medical industry for the preparation of drugs, physiologically compatible with human skin

The invention relates to the field of petrochemical synthesis, and can be used when cleaning ethyl alcohol obtained by the hydration of ethylene

The invention relates to a method of purification of ethanol from carbonyl impurities by treating it with a chemical reagent, rectification and can be used in the production of ethyl alcohol and in the processes of organic synthesis, which uses ethyl alcohol

The invention relates to a method of purifying ethyl alcohol, which finds wide application in the electrical industry and as a solvent when carrying out optical measurements

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of continuous obtaining of dialkylcarbonate of formula (I): (R1O)2CO (I), in which R1 stands for a non-branched or branched alkyl with 1-4 atoms of carbon, and alkyleneglycol of formula (II): R2(OH)2 (II), in which R2 stands for an alkyl with 2-4 carbon atoms, by the realised in the presence of a catalyst re-etherification of cyclic alkylenecarbonate of formula (III): (III): R1OH (III), in which R1 is such as given above, with the re-etherification being realised in a column in a counter-flow mode, with cyclic alkylenecarbonate (1) being supplied into an upper part of the column, and dialkylcarbonate-containing alcohol (3) - into its middle or lower part, and below the place of supply of dialkylcarbonate-containing alcohol other place of the alcohol-containing flow (4) supply is provided, with a ratio of distance between the place of alkylenecarbonate (1) supply and the place of dialkylcarbonate-containing alcohol (3) supply to the distance between the place of alkylenecarbonate (1) supply and the second place of alcohol (4) supply constitutes from 0.2 to 0.52.

EFFECT: method makes it possible to obtain products with the maximally low content of alkylenecarbonate.

13 cl, 4 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkanediol and dialkyl carbonate, which includes: (a) reacting alkylene carbonate and alkanol in the presence of a re-esterification catalyst to obtain a reaction mixture containing dialkyl carbonate, unconverted alkanol, alkanediol and unconverted alkylene carbonate; (b) distilling the reaction mixture in a first distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing dialkyl carbonate, alkanol, alkanediol and alkylene carbonate; (c) distilling the bottom stream from the first distillation column in a second distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing alkanediol and alkylene carbonate; (d) extracting alkanediol from the bottom stream of the second distillation column and (e) distilling the upper streams of the first and second distillation columns in a third distillation column to obtain an upper stream containing alkanol, and a bottom stream containing dialkyl carbonate.

EFFECT: method enables to obtain dialkyl carbonate using a more energy-efficient method.

10 cl, 2 dwg, 4 tbl, 1 ex

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