Method of producing ethylene glycol

FIELD: technological processes.

SUBSTANCE: present invention relates to a method of producing ethylene glycol, involving following steps: (i) supplying ethylene and oxygen and an organic chloride moderator to an ethylene oxide reactor wherein ethylene and oxygen react in presence of a catalyst to produce ethylene oxide, thereby producing a reactor product stream; (ii) supplying reactor product stream to an ethylene oxide absorber wherein ethylene oxide is recovered from reactor product stream by absorption in water in absorber section, thereby producing a rich absorbent stream; (iii) supplying rich absorbent stream to an ethylene oxide stripper wherein rich absorbent stream is steam stripped, thereby producing a concentrated ethylene oxide stream and a lean absorbent stream; (iv) recirculating lean absorbent stream through ethylene oxide absorber; (v) optionally supplying concentrated ethylene oxide stream to one or more carboxylation reactors wherein ethylene oxide reacts with carbon dioxide to form an ethylene carbonate stream; and (vi) supplying concentrated ethylene oxide stream and/or ethylene carbonate stream to one or more hydrolysis reactors wherein ethylene oxide and/or ethylene carbonate reacts with water in presence of a hydrolysis catalyst selected from one or more basic alkali metal salts to form an ethylene glycol stream. Method includes additional steps: (vii) removing a glycol bleed stream from ethylene oxide stripper and (viii) adding a base to ethylene oxide stripper such that pH in bottom section of stripper is maintained in range of from at least 9.5 to at most 12.0.

EFFECT: proposed method reduces amount of chloroethanol present in reaction, and reduces or completely prevents decomposition of hydrolysis catalyst.

10 cl, 2 dwg

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing a fluorine-containing compound, having a carbonate bond, which involves reacting a compound of formula (1) in which X1-X6 denote a chlorine atom, with a fluorine-containing compound, having at least one OH group, in the presence of a catalyst, to obtain a fluorine-containing compound having a carbonate bond, where the fluorine-containing compound having at least one OH group is a polyfluoroalkane monool having 2-10 carbon atoms, which does not have a fluorine atom in the α-position and can have an oxygen atom of an ether.

EFFECT: method enables selective production of various types of fluorine-containing compounds without any inhibition with high output, without using phosgene and without obtaining hydrogen chloride as a by-product.

10 cl, 13 tbl, 13 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing a carbonate compound, involving reaction of a compound of formula , wherein each of X1-X6 represents a chlorine atom, with a compound having one OH group, or a compound having two or more OH groups, in the presence of a catalyst, the catalyst containing a halogen salt.

EFFECT: invention is meant for selective production of various types of carbonate compounds without any inhibition of high output, without using phosgene and without obtaining hydrogen chloride as a by-product.

12 cl, 18 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a reactor for producing alkylene glycol, which is used as a starting substance in production of fibre, polyethylene terephthalate plastics and resins, and is also included in car antifreeze liquids from ethylene oxide, and a method of producing alkylene glycol using said reactor. The disclosed reactor has: (a) a carboxylation zone having one or more inlet openings for liquid reagents which contain alkylene oxide, water, a homogeneous carboxylation catalyst and a homogeneous hydrolysis catalyst, one or more inlet openings for carbon dioxide, one or more ejectors for mixing carbon dioxide with liquid reagents, and one or more outlet openings for the reaction solution which contains alkylene carbonate, water, the homogeneous carboxylation catalyst and the homogeneous hydrolysis catalyst; (b) a hydrolysis zone, having one or more inlet openings for the reaction solution, one or more outlet openings for carbon dioxide, and one or more outlet openings for the product solution which contains alkylene glycol, the homogeneous carboxylation catalyst and the homogeneous hydrolysis catalyst; and (c) a channel through which carbon dioxide can be fed from the hydrolysis zone into the carboxylation zone, where carboxylation zone and the hydrolysis zone are located in one reaction vessel, and where the carboxylation zone is separated from the hydrolysis zone by an inner partition.

EFFECT: objects enable to obtain the end product with high selectivity.

16 cl, 3 ex, 3 dwg

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing alkylene glycol, which can be used as a raw material in production of polyester fibres, polyethylene terephthalate plastic and resins. The method involves the following steps: (a) reacting alkene with oxygen in the presence of a catalyst in a reactor to obtain a gaseous composition containing alkylene oxide, alkene, oxygen, carbon dioxide and water vapour; (b) removing water from the gaseous composition; (c) feeding the gaseous composition from step (b) into an alkylene oxide absorber, feeding the spent absorbent into the alkylene oxide absorber, bringing the gaseous composition into contact with the spent absorbent in the alkylene oxide absorber in the presence of one or more catalysts which facilitate carboxylation at temperature ranging from 80 to 250°C, and removing the enriched absorbent from the absorber, where the spent absorbent contains at least 50 wt % alkylene carbonate and less than 10 wt % water, and where the spent absorbent is fed at temperature ranging from higher 60°C to 250°C; (d) feeding a portion of the enriched absorbent from step (c) into one or more hydrolysis reactors, feeding water into one or more hydrolysis reactors, bringing the enriched absorbent into contact with water in the presence of one or more hydrolysis catalysts in one or more hydrolysis reactors and removing the product stream from the one or more hydrolysis reactors; (e) feeding the product stream from step (d) into a dehydrator, removing water and obtaining a dehydrated product stream; and (f) cleaning the dehydrated product stream from step (e) and obtaining a purified alkylene glycol stream.

EFFECT: method reduces cost of production while ensuring selectivity of the process.

16 cl, 1 ex, 4 tbl, 6 dwg

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of chloroform and alkylene carbonates of the general formula: , wherein R means H, -CH3. Method involves interaction of vicinal glycol with hexachloroacetone at elevated temperature in the presence of metal hydrosilicate of II-d or III-d group of the periodic system of elements followed by isolation of end products by the known methods. Calcium hydrosilicate, magnesium hydrosilicate, aluminum hydrosilicate, barium hydrosilicate or their mixtures are used preferably taken in the different mass ratios. Catalyst is used preferably in the amount 0.5-2% but preferably in the amount 0.8-1.2% of reagents mass. Invention provides increasing yield of chloroform and alkylene carbonate, enhancing their quality and expanding the raw base of substances used in catalytic process.

EFFECT: improved method of synthesis.

3 cl, 3 ex

FIELD: physics, atomic power.

SUBSTANCE: invention relates to design of nuclear reactor fuel assemblies. The fuel assembly has support arrays, having soft revolving sockets (28, 30) with a recess (66, 68, 70) in form of a "dog bone" opening and radial draw of the edges (72), perpendicular to the flow of heat carrier. The radial draw allows unobstructed passage of the fuel rod through a rounded edge into the flat section of contact with the socket rod. The symmetrical "dog bone" shape enables the socket to turn when loading the rod, thereby achieving better alignment between the socket and the fuel rod, thus minimising scratching. The "dog bone" shape also provides a socket with a large contact region to increase softness compared to a typical socket.

EFFECT: reduced contact stress and corrosive wear of fuel rods during operation of the reactor.

18 cl, 7 dwg

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing alkylene glycol, which can be used as a raw material in production of polyester fibres, polyethylene terephthalate plastic and resins. The method involves the following steps: (a) reacting alkene with oxygen in the presence of a catalyst in a reactor to obtain a gaseous composition containing alkylene oxide, alkene, oxygen, carbon dioxide and water vapour; (b) removing water from the gaseous composition; (c) feeding the gaseous composition from step (b) into an alkylene oxide absorber, feeding the spent absorbent into the alkylene oxide absorber, bringing the gaseous composition into contact with the spent absorbent in the alkylene oxide absorber in the presence of one or more catalysts which facilitate carboxylation at temperature ranging from 80 to 250°C, and removing the enriched absorbent from the absorber, where the spent absorbent contains at least 50 wt % alkylene carbonate and less than 10 wt % water, and where the spent absorbent is fed at temperature ranging from higher 60°C to 250°C; (d) feeding a portion of the enriched absorbent from step (c) into one or more hydrolysis reactors, feeding water into one or more hydrolysis reactors, bringing the enriched absorbent into contact with water in the presence of one or more hydrolysis catalysts in one or more hydrolysis reactors and removing the product stream from the one or more hydrolysis reactors; (e) feeding the product stream from step (d) into a dehydrator, removing water and obtaining a dehydrated product stream; and (f) cleaning the dehydrated product stream from step (e) and obtaining a purified alkylene glycol stream.

EFFECT: method reduces cost of production while ensuring selectivity of the process.

16 cl, 1 ex, 4 tbl, 6 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method for controlled oxidation of ethylene to form ethylene oxide, wherein ethylene and oxygen are used along with a silver-based catalyst, a retardant and a co-retardant. When controlling oxidation of ethylene, in order to optimise catalyst properties such as activity and/or selectivity, concentration of the retardant is kept constant within a relatively narrow operating concentration range, and concentration of the co-retardant is varied within a relatively wide operating concentration range. Concentration of the retardant is reduced during the service life of the catalyst.

EFFECT: maintaining efficiency of a silver-based catalyst during oxidation of ethylene as it ages.

16 cl, 3 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing olefin oxides. According to the invention, olefins undergo epoxidation with isopropylene benzene hydroperoxide at temperature 90-120°C in the presence of a molybdenum-containing catalyst obtained by dissolving molybdenum metal in isopropylene benzene hydroperoxide and ethyl alcohol in volume ratio 1:1, into which a Mannich base is added with molar ratio of molybdenum to Mannich base equal to (0.2-0.5).

EFFECT: simple method of producing olefin oxides through a process without solvents and high technological parameters of the epoxidation process.

1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for synthesis of 3,4-epoxycarane of formula I

with simultaneous production of 3-caren-5-one of formula II

and 3-carene-2,5-dione of formula III

, involving the following: 3-carene is treated with diluted hydrogen peroxide in acetonitrile in conditions for catalytic action of manganese sulphate in the presence of sodium bicarbonate and salicylic acid with subsequent extraction of the reaction mixture with methylene chloride, vacuum distillation of crude epoxy and release of 3,4-epoxycarane with 88% purity and 45% output. 3-caren-5-one II and 3-carene-2,5-dione III are separated through chromatograph on an inverted C-18 phase with output of 13% and 7% respectively.

EFFECT: design of a method for synthesis of intermediate compounds for a range of medical, industrial and perfume preparations.

1 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to methods for synthesis of bicyclo[3.1.0]hexane derivatives, used as mGIuR agonists having formulae ,

, where R1 and R2 represent hydrogen, X is a halogen, R3 is -O-Ra , Ra is C1-10alkyl, and R4 is (1) hydrogen or (2) Si-(R9)(R10)(R11), where each of R9, R10 and R11 is C1-10alkyl, as well as intermediate compounds obtained when realising the said methods.

EFFECT: design of an efficient method for synthesis of bicyclo[3,1,0]hexane derivatives.

26 cl, 17 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to novel substituted cycloalkene derivatives of formula (I) in which X and Y are a group, in which X and Y together with a carbon atom on ring B to which they are bonded form a ring A, X and Y together represent a ring B substitute, or each of X and Y is a hydrogen atom.

EFFECT: invention relates to a medicinal agent based on the said compounds, which has inhibitory effect on intracellular signal transduction or cell activation induced by an endotoxin.

21 cl, 3 tbl, 191 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing ethylene oxide by bringing a mixture fed into an epoxidation reactor, which may contain ethylene, oxygen, carbon dioxide and water in a defined concentration, into contact with a highly selective epoxidation catalyst containing a promoter amount of rhenium. Contacting the mixture fed into the epoxidation reactor is done under epoxidation reaction conditions at reaction temperature below 260°C. The said mixture contains carbon dioxide in concentration less than 2 mol % of the entire mixture and concentration of water in the mixture of at most 1.5 mol % of the entire mixture. Observation of the combination of the said conditions for carrying out the epoxidation process improves operational properties of the epoxidation catalyst, for example increased stability, selectivity and activity of the catalyst.

EFFECT: invention also relates to a method of producing 1,2-ethanediol or 1,2-diol ether, which involves production of ethylene oxide using the method described above and its conversion to 1,2-ethanediol or 1,2-diol ether.

10 cl, 5 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: claimed is water solution of hydrogen peroxide, suitable for olefine epoxidation, which includes: I) in total less than 50 wt fraction/mln of alkaline metals, alkaline-earth metals or their combinations irrespective of whether said alkaline or alkaline-earth metals are in catione-active or complex form; II) in total at least 50 wt fraction/mln of amines, which have pkb value less than 4.5, or respective protonated compounds; and III) in total at least 100 wt fraction/mln anions or compounds, which are able to dissociate with anion formation, according to which values in wt fraction/mln are given in terms of hydrogen peroxide weight. Claimed is method of obtaining hydrogen peroxide solution. Claimed is application of water solution of hydrogen peroxide.

EFFECT: economically efficient production of water solution of hydrogen peroxide and improved long-term activity and selectivity of catalyst.

18 cl, 5 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: according to the present invention, ethylene is oxidised in contact with mix of heterogeneous catalyst in particles and solid inert substance in particles, treated with alkali metal, in oxidation conditions.

EFFECT: improved efficiency.

3 cl, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to improved method of extraction of ethylene oxide (EO), intended for application as raw material for combined installations for production of ethyleneglycol and EO purification. In accordance with invention claimed method includes supply of steam-like flow of reaction products, containing EO, CO2, formaldehyde and organic acidic compounds, first to bottom section of quenching zone and realisation in said bottom zone of contact of steam-like flow of reaction products with diluted water solution of alkaline hydroxide, where said alkaline hydroxide reacts with CO2 with formation of carbonates and bicarbonates, which react and thus neutralise organic acidic admixtures, contact of subjected to wet purification steam-like flow of reaction products, output from top part of bottom section of quenching zone, with first mesh coagulant, further supply of steam-like flow of reaction products, which was subjected to said preliminary processing, into section with water washing, where it is washed with fresh technological water to absorb any caught alkaline quenching liquid and formaldehyde vapours, realisation of contact of washing water flow, output from bottom part of section of water washing, with first mesh coagulant and its supply into top part of bottom quenching zone, passing steam-like flow of reaction products, output from section of water washing, through second mesh coagulant and its supply into bottom part of absorber, EO, where it is subjected to countercurrent washing with recycled, EO-free technological water to absorb EO in order to obtain EO-containing absorbate; supply of first part, containing 15-75% of diluted, EO-containing absorbate from EO absorber directly into EO reabsorber/residual absorber, where additional amount of EO is absorbed from vapour of upper distillate of EO desorber with obtaining highly pure EO solution with specified EO concentration, intended for application as raw material for reaction of obtaining glycol and/or raw material for EO purification, and supply of second remaining part of diluted, EO-containing absorbate from EO absorber into EO desorber, where EO and absorbed non-condensable gases are completely desorbed by vapour and flow of bottom product, which does not contain EO, is cooled and recycled back into EO absorber.

EFFECT: increased degree of purity of extracted EO.

5 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of extracting 3,4-benz(a)pyrene, having high toxicity and carcinogenic properties, from soil, bottom deposits and waste water sludge. The method involves mixing the analysed sample in powder form with a liquid extractant in a given volume ratio, heating the obtained mixture with thermal ageing which allows the transfer of 3,4-benz(a)pyrene into the solution, filtering the solution by decantation, adding an extractant of corresponding polarity to the analysed compound, followed by evaporation of the solution to a dry substrate and determining the amount of 3,4-benz(a)pyrene by liquid chromatography. The liquid extractant used is distilled water. Heating and thermal ageing of the obtained mixture are carried out in a sealed reactor and once the 3,4-benz(a)pyrene is transferred into the solution, the reactor is cooled to room temperature.

EFFECT: using a simple technology, the method enables to cut the duration and number of steps of extraction and increases the output of the extracted 3,4-benz(a)pyrene.

5 cl, 5 ex, 2 tbl, 3 dwg

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing alkylene glycol, which can be used as a raw material in production of polyester fibres, polyethylene terephthalate plastic and resins. The method involves the following steps: (a) reacting alkene with oxygen in the presence of a catalyst in a reactor to obtain a gaseous composition containing alkylene oxide, alkene, oxygen, carbon dioxide and water vapour; (b) removing water from the gaseous composition; (c) feeding the gaseous composition from step (b) into an alkylene oxide absorber, feeding the spent absorbent into the alkylene oxide absorber, bringing the gaseous composition into contact with the spent absorbent in the alkylene oxide absorber in the presence of one or more catalysts which facilitate carboxylation at temperature ranging from 80 to 250°C, and removing the enriched absorbent from the absorber, where the spent absorbent contains at least 50 wt % alkylene carbonate and less than 10 wt % water, and where the spent absorbent is fed at temperature ranging from higher 60°C to 250°C; (d) feeding a portion of the enriched absorbent from step (c) into one or more hydrolysis reactors, feeding water into one or more hydrolysis reactors, bringing the enriched absorbent into contact with water in the presence of one or more hydrolysis catalysts in one or more hydrolysis reactors and removing the product stream from the one or more hydrolysis reactors; (e) feeding the product stream from step (d) into a dehydrator, removing water and obtaining a dehydrated product stream; and (f) cleaning the dehydrated product stream from step (e) and obtaining a purified alkylene glycol stream.

EFFECT: method reduces cost of production while ensuring selectivity of the process.

16 cl, 1 ex, 4 tbl, 6 dwg

FIELD: chemistry.

SUBSTANCE: according to the invention, a base is further added to one or more positions downstream the heat-removal section of an ethylene oxide absorber to main pH in the range of 5.5-9.5, in at least one region, where glycolic esters are hydrolysed to an organic acid and ethylene glycol.

EFFECT: reduced corrosion of an ethylene oxide or ethylene glycol producing apparatus.

10 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of removing poly(propylene oxide) from propylene oxide through membrane separation. The membrane used is a nonporous membrane made from polysiloxane containing repeating units of formula: -Si (R) (R')-O-, where R and R' denote hydrogen or a hydrocarbon group selected from alkyl, aralkyl, cycloalkyl, aryl and alkaryl.

EFFECT: improved method.

8 cl, 2 tbl, 1 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a vessel which is used in an ethylene oxide extraction/distillation system, ethylene oxide extraction/distillation system and a method of extracting ethylene oxide from an aqueous liquid - ethylene oxide absorbent. Distillation and reabsorption processes during extraction of ethylene oxide from an aqueous absorbent are usually carried out separately. The invention discloses a single vessel for extracting and distilling ethylene oxide, which is divided by an inner partition wall into separate sections where reabsorption and distillation take place.

EFFECT: simplification of industrial operations and improved overall safety of the installation due to smaller area of the section required for reabsorption and distillation.

20 cl, 2 dwg

Up!