Method of separation of naphthenic acids mixture

FIELD: chemistry.

SUBSTANCE: method lies in the following: concentrated solution of lithium salt is introduced into mixture of sodium salts of naphthenic acids, mixed and left for separation into layers and formation of viscous mass of lithium salt of naphthenic acid high-molecular fraction with molecular weight more than 200 in sediment, and in upper water layer - of low-molecular fraction of naphthenic acids lithium salt with molecular weight less than 200, with subsecutive separation.

EFFECT: separation of concentrated water solutions of naphthetic acids lithium salts according to their molecular weight.

2 cl, 2 ex

 

The invention relates to the production of petroleum products, namely the production of naphthenic acids and their salts, and can be used in construction for the production of concrete, in the petrochemical industry, as additives to the fuel as a lubricant preparations.

The composition of these products is complex and is not constant because it depends on the place of oil. Extracted naphthenic acids from petroleum products in the form of sodium salts (malonate), milonoff treated with sulfuric acid to produce naphthenic acids (eidola). The composition of malonate and acidol very difficult as the molecular structures of naphthenic acids and impurities. Attempts to allocate individual compounds or related narrow fractions do not give a result, which ultimately leads to their use as technical mixture, while the separation into fractions increases the range of petroleum products, suitable for use in fine chemical technology.

The known method of separation of naphthenic acids by distillation (Nametkin NS, Egorova G.M., Khamaev V.H. Naphthenic acids and the products of their chemical processing. M.: Chemistry. 1983. P.21-25). This method consists in the fact that acidol subjected to distillation under reduced pressure.

The disadvantage of this method is that impurities are not completely separated from the main product, and fractions containing the PSS is ing a mixture of naphthenic acids.

The known method of separation of naphthenic acids by selective extraction reagents, such as alumina, sulfuric acid, resins, alcohols. (Stamina L.D., Savinykh Y. identification and analysis of oxygen-containing compounds. In kN. Separation and analysis of petroleum systems. Ed. Bolshakov GF Novosibirsk: Nauka. 1989. P.41-55).

The disadvantage of these methods is that naphthenic acids are not practionercourse, and only partially cleared of unsaponifiable substances, phenols, resins.

The applicant and the authors are unknown methods of separation of naphthenic acids, based on the selective dissolution of alkali metal salts in the water.

The technical result of the proposed method is the separation of concentrated aqueous solutions of lithium salts of naphthenic acids of molecular weight as to extend the range of petroleum products.

The technical result is achieved in that in the mixture of sodium salts of naphthenic acids enter the salt of the alkali metal in the form of a concentrated solution of lithium salts in the ratio of the mixture of salts of naphthenic acids, water, concentrated lithium salt solution 1:1:1,5, stirred for 15-30 minutes, leave for a day for stratification and education to precipitate a viscous mass of lithium salts of high molecular weight fractions of naphthenic acids (molecular weight of 200 or more), and in the upper water layer is low molekulyarnoi fraction of the lithium salt of naphthenic acid (molecular weight of 200 or less).

High and low molecular weight fractions of naphthenic acids separated by decantation and mixed with each of three normal sulfuric acid (ratio 1:1.5) to obtain the corresponding fractions of naphthenic acids. In the industry getting naphthenic acids on the basis of their salts is carried out by treatment of sodium salts in an aqueous solution of three-normal sulfuric acid (Nametkin NS, Egorova G.M., Khamaev V.H. Naphthenic acids and the products of their chemical processing. M.: Chemistry. 1983. P.16).

It was established experimentally that in contrast to water soluble salts of sodium and potassium organic acid lithium salt solubility in water are divided into vysokodetalnye for low molecular weight acids (molecular weight less than 200) and soluble high molecular weight acids (molecular mass of more than 200). This rule also applies in the case of naphthenic acids, which have allowed us to develop a method of fractionating molecular weight consistent translation of eidola in sodium salt, and then mix with the salt of a chloride or nitrate of lithium to fractionate them to factor in the solubility of lithium salts in the water.

Thus, the set of essential features allows to achieve the desired technical result is the separation of a mixture of naphthenic acids with low molecular weight and high is warnow faction.

Examples of the implementation of the proposed method.

Example 1. 100 g of malonate mixed with 100 ml of water and poured 150 ml of concentrated aqueous solution of lithium chloride. After stirring for 15-30 minutes the emulsion mass leave on the day for stratification. In the sediment the next day you get a viscous mass of lithium salts of high molecular weight naphthenic acids. The upper aqueous layer contains the low molecular weight fraction of the lithium salt of naphthenic acids. Fractions separated by decantation and mixed with 3 n sulfuric acid, resulting in two fractions of naphthenic acids: low-molecular - from the upper layer and the high-molecular - from the bottom layer. Potentiometric titration was established that the molecular weight naphthenic acids isolated from the upper water layer, are 100-180, and the lower 200-300. Depending on the origin of oil, the ratio of the fractions ranges from 1:2 to 2:1.

Example 2. Technical naphthenic acid - acidol - brown viscous product in the amount of 100 ml is treated with an aqueous solution of sodium hydroxide and 150 ml. further treated as in example 1.

1. The method of separation of naphthenic acids, characterized in that the mixture of sodium salts of naphthenic acids enter the concentrated lithium salt solution, mix and leave for stratification and education the Oia to precipitate a viscous mass of lithium salts of high molecular weight fractions of naphthenic acids with a molecular mass of more than 200, and in the upper water layer of the low molecular weight fraction of the lithium salt of naphthenic acids with a molecular mass of less than 200, and then separate.

2. The method according to claim 1, characterized in that the high and low molecular weight fractions of lithium salts of naphthenic acids separated by decantation and each fraction is mixed with sulfuric acid to obtain fractions of high molecular weight and low molecular weight naphthenic acids.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method, by which the carboxylic acid/diol mixture, that is suitable as the initial substance for the manufacture of polyester, obtained from the decolourised solution of carboxylic acid without actually isolating the solid dry carboxylic acid. More specifically, the invention relates to the method of manufacturing a mixture of carboxylic acid/diol, where the said method includes the addition of diol to the decolourised solution of carboxylic acid, which includes carboxylic acid and water, in the zone of the reactor etherification, where diol is located at a temperature sufficient for evaporating part of the water in order to become the basic suspending liquid with the formation of the specified carboxylic acid/diol mixture; where the said carboxylic acid and diol enter into a reaction in the zone of etherification with the formation of a flow of a complex hydroxyalkyl ether. The invention also relates to the following variants of the method: the method of manufacture of the carboxylic acid/diol mixture, where the said method includes the following stages: (a) mixing of the powder of damp carboxylic acid with water in the zone for mixing with the formation of the solution of damp carboxylic acid; where the said carboxylic acid is selected from the group, which includes terephthalic acid, isophthatic acid, naphthalenedicarboxylic acid and their mixtures; (b) discolourisation of aforesaid solution of damp carboxylic acid in the zone for reaction obtaining the decolourised solution of carboxylic acid; (c) not necessarily, instantaneous evaporation of the said decolourised solution of carboxylic acid in the zone of instantaneous evaporation for the removal of part of the water from the decolourised solution of carboxylic acid; and (d) addition of diol to the decolourised solution of carboxylic acid in the zone of the reactor of the etherification, where the said diol is located at a temperature, sufficient for the evaporation of part of the water in order to become the basic suspending liquid with the formation of the carboxylic acid/diol mixture; where the aforesaid carboxylic acid and diol then enter the zone of etherification with the formation of the flow of complex hydroxyalkyl ether; and relates to the method of manufacture of carboxylic acid/diol, where the said method includes the following stages: (a) the mixing of the powder of damp carboxylic acid with water in the zone for mixing with the formation of the solution of carboxylic acid; (b) discolourisation of the said solution of damp carboxylic acid in the reactor core with the formation of the decolourised solution of carboxylic acid; (c) crystallisation of the said decolourised solution of carboxylic acid in the zone of crystallisation with the formation of an aqueous suspension; and (d) removal of part of the contaminated water in the aforesaid aqueous solution and addition of diol into the zone of the removal of liquid with the obtaining of the said carboxylic acid/diol mixture, where diol is located at a temperature sufficient for evaporating part of the contaminated water from the said aqueous suspension in order to become the basic suspending liquid.

EFFECT: obtaining mixture of carboxylic acid/diol.

29 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention pertains to the perfection of the method of regulating quantities of dissolved iron in liquid streams during the process of obtaining aromatic carboxylic acids or in the process of cleaning technical aromatic carboxylic acids, characterised by that, to at least, part of the liquid stream for regulating the quantity of dissolved iron in it, at least one peroxide with formula R1-O-O-R2 is added. Here R1 and R2 can be the same or different. They represent hydrogen or a hydrocarbon group, in quantities sufficient for precipitation of the dissolved iron from the liquid. The invention also relates to the perfection of the method of obtaining an aromatic carboxylic acid, through the following stages: A) contacting the crude aromatic material which can be oxidised, with molecular oxygen in the presence of an oxidising catalyst, containing at least, one metal with atomic number from 21 to 82, and a solvent in the form of C2-C5 aliphatic carboxylic acid in a liquid phase reaction mixture in a reactor under conditions of oxidation with formation of a solid product. The product contains technical aromatic carboxylic acid, liquid, containing a solvent and water, and an off-gas, containing water vapour and vapour of the solvent; B) separation of the solid product, containing technical aromatic carboxylic acid from the liquid; C) distillation of at least part of the off gas in a distillation column, equipped with reflux, for separating vapour of the solvent from water vapour. A liquid then forms, containing the solvent, and in the upper distillation cut, containing water vapour; D) returning of at least, part of the liquid from stage B into the reactor; E) dissolution of at least, part of the separated solid product, containing technical aromatic carboxylic acid, in a solvent from the cleaning stage with obtaining of a liquid solution of the cleaning stage; F) contacting the solution from the cleaning stage with hydrogen in the presence of a hydrogenation catalyst and under hydrogenation conditions, sufficient for formation of a solution, containing cleaned aromatic carboxylic acid, and liquid, containing a cleaning solvent; G) separation of the cleaned aromatic carboxylic acid from the solution, containing the cleaning solvent, which is obtained from stage E, with obtaining of solid cleaned aromatic carboxylic acid and a stock solution from the cleaning stage; H) retuning of at least, part of the stock solution from the cleaning stage, to at least, one of the stages B and E; I) addition of at least, one peroxide with formula R1-O-O-R2, where R1 and R2 can be the same or different, and represent hydrogen or a hydrocarbon group, in a liquid from at least one of the other stages, or obtained as a result from at least one of these stages, to which the peroxide is added, in a quantity sufficient for precipitation of iron from the liquid.

EFFECT: controlled reduction of the formation of suspension of iron oxide during production of technical aromatic acid.

19 cl, 1 dwg, 6 ex, 4 tbl

FIELD: organic chemistry.

SUBSTANCE: invention relates to method for purification of monochloroacetic acid from dichloroacetic acid impurities. Claimed method includes hydrogenolysis in presence of hydrogen in film regime at 135-145°C in cascade of sequentially bonded reactors with fixed bed of heterogeneous catalyst namely palladium on activated carbon. Preferably reactor cascade with intermediate cooling with cold flow of monochloroacetic acid as cooling agent is used.

EFFECT: simplified process; product of improved quality.

3 cl, 7 ex, 3 dwg

The invention relates to the production of acetic acid by carbonyliron of methanol with carbon monoxide, in particular to the purification method of the circulating flow boiling components at the stage of distillation of acetic acid

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The invention relates to a new process for the preparation of fluorinated acids emulsifiers of waste water for the purpose of regeneration, namely, that first from waste water of polymerization of fluorinated monomers remove interfering components selected from finely dispersed solids and transferred to the solid component, and then connect the fluorinated acid emulsifiers on anion exchange resin and elute from it these fluorinated acid emulsifiers

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FIELD: organic chemistry.

SUBSTANCE: invention relates to method for purification of monochloroacetic acid from dichloroacetic acid impurities. Claimed method includes hydrogenolysis in presence of hydrogen in film regime at 135-145°C in cascade of sequentially bonded reactors with fixed bed of heterogeneous catalyst namely palladium on activated carbon. Preferably reactor cascade with intermediate cooling with cold flow of monochloroacetic acid as cooling agent is used.

EFFECT: simplified process; product of improved quality.

3 cl, 7 ex, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention pertains to the perfection of the method of regulating quantities of dissolved iron in liquid streams during the process of obtaining aromatic carboxylic acids or in the process of cleaning technical aromatic carboxylic acids, characterised by that, to at least, part of the liquid stream for regulating the quantity of dissolved iron in it, at least one peroxide with formula R1-O-O-R2 is added. Here R1 and R2 can be the same or different. They represent hydrogen or a hydrocarbon group, in quantities sufficient for precipitation of the dissolved iron from the liquid. The invention also relates to the perfection of the method of obtaining an aromatic carboxylic acid, through the following stages: A) contacting the crude aromatic material which can be oxidised, with molecular oxygen in the presence of an oxidising catalyst, containing at least, one metal with atomic number from 21 to 82, and a solvent in the form of C2-C5 aliphatic carboxylic acid in a liquid phase reaction mixture in a reactor under conditions of oxidation with formation of a solid product. The product contains technical aromatic carboxylic acid, liquid, containing a solvent and water, and an off-gas, containing water vapour and vapour of the solvent; B) separation of the solid product, containing technical aromatic carboxylic acid from the liquid; C) distillation of at least part of the off gas in a distillation column, equipped with reflux, for separating vapour of the solvent from water vapour. A liquid then forms, containing the solvent, and in the upper distillation cut, containing water vapour; D) returning of at least, part of the liquid from stage B into the reactor; E) dissolution of at least, part of the separated solid product, containing technical aromatic carboxylic acid, in a solvent from the cleaning stage with obtaining of a liquid solution of the cleaning stage; F) contacting the solution from the cleaning stage with hydrogen in the presence of a hydrogenation catalyst and under hydrogenation conditions, sufficient for formation of a solution, containing cleaned aromatic carboxylic acid, and liquid, containing a cleaning solvent; G) separation of the cleaned aromatic carboxylic acid from the solution, containing the cleaning solvent, which is obtained from stage E, with obtaining of solid cleaned aromatic carboxylic acid and a stock solution from the cleaning stage; H) retuning of at least, part of the stock solution from the cleaning stage, to at least, one of the stages B and E; I) addition of at least, one peroxide with formula R1-O-O-R2, where R1 and R2 can be the same or different, and represent hydrogen or a hydrocarbon group, in a liquid from at least one of the other stages, or obtained as a result from at least one of these stages, to which the peroxide is added, in a quantity sufficient for precipitation of iron from the liquid.

EFFECT: controlled reduction of the formation of suspension of iron oxide during production of technical aromatic acid.

19 cl, 1 dwg, 6 ex, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method, by which the carboxylic acid/diol mixture, that is suitable as the initial substance for the manufacture of polyester, obtained from the decolourised solution of carboxylic acid without actually isolating the solid dry carboxylic acid. More specifically, the invention relates to the method of manufacturing a mixture of carboxylic acid/diol, where the said method includes the addition of diol to the decolourised solution of carboxylic acid, which includes carboxylic acid and water, in the zone of the reactor etherification, where diol is located at a temperature sufficient for evaporating part of the water in order to become the basic suspending liquid with the formation of the specified carboxylic acid/diol mixture; where the said carboxylic acid and diol enter into a reaction in the zone of etherification with the formation of a flow of a complex hydroxyalkyl ether. The invention also relates to the following variants of the method: the method of manufacture of the carboxylic acid/diol mixture, where the said method includes the following stages: (a) mixing of the powder of damp carboxylic acid with water in the zone for mixing with the formation of the solution of damp carboxylic acid; where the said carboxylic acid is selected from the group, which includes terephthalic acid, isophthatic acid, naphthalenedicarboxylic acid and their mixtures; (b) discolourisation of aforesaid solution of damp carboxylic acid in the zone for reaction obtaining the decolourised solution of carboxylic acid; (c) not necessarily, instantaneous evaporation of the said decolourised solution of carboxylic acid in the zone of instantaneous evaporation for the removal of part of the water from the decolourised solution of carboxylic acid; and (d) addition of diol to the decolourised solution of carboxylic acid in the zone of the reactor of the etherification, where the said diol is located at a temperature, sufficient for the evaporation of part of the water in order to become the basic suspending liquid with the formation of the carboxylic acid/diol mixture; where the aforesaid carboxylic acid and diol then enter the zone of etherification with the formation of the flow of complex hydroxyalkyl ether; and relates to the method of manufacture of carboxylic acid/diol, where the said method includes the following stages: (a) the mixing of the powder of damp carboxylic acid with water in the zone for mixing with the formation of the solution of carboxylic acid; (b) discolourisation of the said solution of damp carboxylic acid in the reactor core with the formation of the decolourised solution of carboxylic acid; (c) crystallisation of the said decolourised solution of carboxylic acid in the zone of crystallisation with the formation of an aqueous suspension; and (d) removal of part of the contaminated water in the aforesaid aqueous solution and addition of diol into the zone of the removal of liquid with the obtaining of the said carboxylic acid/diol mixture, where diol is located at a temperature sufficient for evaporating part of the contaminated water from the said aqueous suspension in order to become the basic suspending liquid.

EFFECT: obtaining mixture of carboxylic acid/diol.

29 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: method lies in the following: concentrated solution of lithium salt is introduced into mixture of sodium salts of naphthenic acids, mixed and left for separation into layers and formation of viscous mass of lithium salt of naphthenic acid high-molecular fraction with molecular weight more than 200 in sediment, and in upper water layer - of low-molecular fraction of naphthenic acids lithium salt with molecular weight less than 200, with subsecutive separation.

EFFECT: separation of concentrated water solutions of naphthetic acids lithium salts according to their molecular weight.

2 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining product - purified carboxylic acid, includes: (a) oxidation of aromatic initial materials in primary oxidation zone with formation of raw carboxylic acid suspension; where raw carboxylic acid suspension contains terephthalic acid; where said oxidation is carried out at temperature within the range from 120°C to 200°C; (b) withdrawal of admixtures from raw suspension of carboxylic acid, removed at temperature from 140°C to 170°C from stage of oxidation of paraxylol in primary oxidation zone and containing terephthalic acid, catalyst, acetic acid and admixtures, realised in zone of solid products and liquid separation with formation of mother liquid flow and product in form of suspension; where part of said catalyst in said suspension of raw carboxylic acid is removed in said mother liquid flow; and where into said zone of solid products and liquid separation optionally additional solvent is added; (c) oxidation of said product in form of suspension in zone of further oxidation with formation of product of further oxidation; where said oxidation is carried out at temperature within the range from 190°C to 280°C; and where said oxidation takes place in said zone of further oxidation at temperature higher than in said primary oxidation zone; (d) crystallisation of said product of further oxidation in crystallisation zone with formation of crystallised product in form of suspension; (e) cooling of said crystallised product in form of suspension in cooling zone with formation of cooled suspension of purified carboxylic acid; and (i) filtration and optionally drying of said cooled suspension of purified carboxylic acid in filtration and drying zone in order to remove part of solvent from said cooled suspension of carboxylic acid with obtaining of said product - purified carboxylic acid.

EFFECT: purified carboxylic acid with nice colour and low level of admixtures, without using stages of purification like hydration.

8 cl, 1 tbl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: method of (meth)acrylic acid purification includes the stages as follows: distillations of the liquid containing raw (meth)acrylic acid being acrylic acid or methacrylic acid with one or more polymerisation inhibitors added as chosen from group consisting of phenol derivative, phenothiazine derivative, copper (meth)acrylate and copper dithiourethane, for the purpose to produce condensate of (meth)acrylic acid, containing (meth)acrylic acid of purity at least 90%; adding polymerisation inhibitor containing phenol derivative to condensate; and delivery of oxygen-containing gas that contains oxygen to condensate of (meth)acrylic acid in reflux tank wherein condensate of (meth)acrylic acid is collected, wherein oxygen-containing gas is delivered to condensate in reflux tank with using small-size bubble liquid injector, and pressure connection for oxygen-containing gas delivery to liquid injector whereat ratio (nm/tn) of oxygen delivery in oxygen-containing gas and condensate flow supplied to reflux tank at 0°C, 1 atm complies with ratio shown in equation 0.004≤A/B≤1.0, where A stands for O2 delivery (nm3/hour), B stands for condensate flow (tn/hour) of the condensate supplied to reflux tank, and symbol n in nm3/hour specifies the value under normal conditions (0°C, 1 atm: normal conditions).

EFFECT: effective method of high purity acid production wherein acid polymer formation in made condensate is prevented.

12 cl, 6 dwg, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to improved method of recovering (meth)acrolein or (meth)acrylic acid, including stage of cooling of gaseous reaction mixture containing (meth)acrolein or (meth)acrylic acid obtained by reaction of catalytic oxidation in vapour phase of one or both reagents selected from (A) propane, propylene or isobutylene and (B) (meth)acrolein, with molecular oxygen or gas, containing molecular oxygen, to temperature 140-250C; contacting of said gaseous reaction mixture with solvent, whose temperature is 20-50C, in recovery installation for recovering (meth)acrolein or (meth)acrylic acid in solvent, where said recovery installation contains contact zone, where gaseous reaction mixture contacts with solvent, having transversal section of round form and many devices of gaseous reaction mixture supply for supplying gaseous reaction mixture into contact zone, devices of gaseous reaction mixture supply are installed in contact zone at the same height directed towards contact zone centre, gaseous reaction mixture is supplied to contact zone from devices of gaseous reaction mixture supply and is subjected to collision straight in one point of contact zone, and recovery installation does not have device which prevents direct collision of gaseous mixture supplied from devices of gaseous reaction mixture supply. Invention also relates to recovery installation for recovering (meth)acrolein or (meth)acrylic acid.

EFFECT: ensuring efficient recovering (meth)acrolein or (meth)acrylic acid from gas containing (meth)acrolein or (meth)acrylic acid, preventing polymerisation.

7 cl, 5 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention refers to advanced method of production of (meth)acrylic acid ester including (meth)acrylic acid purification by contacting raw (meth)acrylic acid containing manganese as an impurity manganese, and cation-exchange resin to remove manganese. To ensure contacting raw (meth)acrylic acid and cation-exchange resin, water is pre-added to (meth)acrylic acid. Besides, the method involves reaction of purified (meth)acrylic acid and alcohol with acid catalyst added.

EFFECT: method allows preventing effectively deactivation of the acid catalyst used in etherification reaction, equipment plugging and can ensure stable ester manufacturing.

3 cl, 5 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention concerns aggregate for (met)acrylic acid obtainment, including: reactor for (met)acrylic acid obtainment by catalytic gas phase oxidation reaction of one, two or more source compounds including propane, propylene, isobutylene and (met)acrolein, in gas mix of source substances including one, two or more source compounds including propane, propylene, isobutylene and (met)acrolein, and oxygen; heat exchanger connected to reactor and intended for cooling of reaction gas mix including obtained (met)acrylic acid; and absorption column connected to heat exchanger and intended for contact absorbing fluid with reaction gas mix for (met)acrylic acid absorption, so that (met)acrylic acid is absorbed from reaction gas mix by absorbing fluid. Additionally the aggregate includes: bypass pipe connecting reactor and absorption column without the use of intermediary heat exchanger; and device for flow rate adjustment in reaction gas flow passing through bypass pipe in order to maintain almost constant flow rate of gas mix feed of source materials to reactor or almost constant pressure of gas mix of source materials at the reactor inlet. Also invention concerns improved method of (met)acrylic acid obtainment by extraction of (met)acrylic acid absorbed by absorbing fluid.

EFFECT: heat power tapping from reaction gas mix, stable and continuous process even in case of heat exchanger intended for heat power extraction is blocked.

2 cl, 3 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: proposed method involves the following stages: (a) reaction of carbon monoxide with at least one reagent chosen from a group, consisting of methanol, methyl acetate, methyl formate and dimethyl ether and their mixture in a reaction medium, containing water, methyl iodide and catalyst for obtaining the reaction product, containing acetic acid; (b) gas-liquid separation of the said reaction product to obtain a volatile phase, containing acetic acid, water and methyl iodide and a less volatile phase, containing the said catalyst; (c) distillation of the above mentioned volatile phase to obtain a purified product of acetic acid and a first overhead fraction, containing water, methylacetate and methyl iodide; (d) phase separation of the above mentioned first overhead fraction to obtain the first liquid phase, containing water, and second liquid phase, containing methyl iodide and methyl acetate; and (e) feeding dimethyl ether directly or indirectly into a decantation tank of light fractions for phase separation of the said first overhead fraction in a quantity, sufficient for increasing separation of the first overhead fraction to form the first and second liquid phases.

EFFECT: improvement of the method of producing acetic acid.

8 cl, 1 dwg

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