The method of extraction of hydrocarbons desulfation

 

(57) Abstract:

Use: in organic sulfur production. The inventive method provides for the extraction desulfation hydrocarbons by mixing the original sportowego solution alkylsulfate sodium with fazeley water and the extract phase the final stage of extraction. The resulting mixture is separated into extract and rafinate phase in the gravity settler. Selected rafinate phase is mixed with the extractant - gasoline fraction (i.e. boiling 55 - 105C) the hydrodynamic nozzle, when the linear velocity flows in the input nozzles 2,3 - 9.4 m/s and at a frequency of elastic vibrations flow in the vortex chambers 60 - 250 Hz with subsequent separation obtained after acoustic treatment of the mixture to extract and rafinate phase in nacadoches extraction column. table 1. 2 Il.

The invention relates to mass transfer processes in chemical technology, in particular, to methods of extraction desulfation hydrocarbons (NSO) of the alcohol solution of the secondary alkyl sulphates and sodium (ASN), and can be used in the production of surface-active substances used as the basis of synthetic detergents, penop Ipotechniy extraction with a turnover of solvent, which consists in mixing two liquids at each step in centrifugal pumps or agitators and subsequent separation of the mixture into the raffinate and extract phases in the settling tanks, installed either horizontally or cascading.

In these methods, the first stage is mixed source solution with the extract of the subsequent stages, intermediate stages of the raffinate of the previous stage with the extract of the subsequent stage, the final stage is fresh and circulating the solvent from the raffinate of the previous stage. The leaf extract and the raffinate is removed from the sumps of the first and final stages, respectively, and are referred to the removal of the solvent.

Known methods of extraction have significant shortcomings. Used in mechanical mixing does not provide enough developed surface of contact between the phases and a high diffusion rate of the extracted component. Satisfactory results in the known methods is achieved through the use of metal-processing equipment that requires large capital expenditures. Typically, such processes are characterized by low productivity per unit volume of the mass transfer apparatus.

Svetlichny in the early 60-ies project Kuibyshev branch Giproneftezavod" domestic installations for the production of detergents.

In Fig. 1 is a diagram of the extraction process carried out by a known method.

Source spirtually solution ASN I passed through gravitational settling tank 1, where partially allocate NPC II and display them at the top and bottom phase III served by pump 2 into the mixer 3 dilution of fazeley water (VAT residue column distillation of isopropyl alcohol) IV. Diluted spirtually solution ASN V served in the upper part of the Packed extraction columns 4. In the lower part of the column through the mixer 5 enter the extractant VI (gasoline fraction with a boiling within 55 - 105aboutC) and the extract phase VII withdrawn by the pump 7 from the top of the Packed extractional column 6. In column 4 the extractant extracts from sportowego solution ASN bulk contained in the NSA, forming an extract phase VIII, output on top, in the regeneration of the extractant, and spirtually solution ASN IX taken from the bottom of the pump 8 and serves in the upper part of the extraction column 6. In the lower part of this column serves fresh extractant VI. Cleared from the NSO spirtually solution ASN X deduce from the bottom of the column 6.

The disadvantage of this method is a noticeable decrease in the efficiency of the extraction process when povyshatelnyj solution ASN) are distributed over the diameter of the column unevenly, particularly for the case of film flow of the dispersed phase on the surface of the nozzle, due to the better wettability. The surface of contact of phases is determined by the "wetted surface" nozzle, which significantly decreases with distance from the spray device. A consequence of the uneven distribution of the liquid is the need for periodic redistribution of flows. All this complicates the design and increases the specific work obeys extraction device.

The aim of the invention is to improve the performance of the extraction process GCS from sportowego solution ASN due to the acceleration time of phase separation.

This objective is achieved in that the source spirtually solution ASN pre-mixed with fazeley water and the extract phase end-stage extraction, the mixture separated into extract and rafinate phase in the gravity settling tank, and the selected rafinate phase is mixed with the extractant (gasoline fraction 55 - 105about(C) the hydrodynamic nozzle at linear flow rates in the inlet nozzles 2,3 - 9.4 m/s and the frequency of elastic vibrations of the flow in the vortex chambers 60 - 250 Hz. The mixture and after the tx2">

In Fig. 2 is a diagram of the process of extraction the proposed method.

In the mixer 1 served continuously spirtually solution ASN 1, fuseline II water and the extract phase III (solution NPC in the gasoline fraction from the extraction column 3. This fusella water plays a polarizing role, promoting coagulation molecules of ACH in slightly polar environment - extract phase, and the return of the extract phase in the source spirtually solution ASN increases in the mixture, the concentration generated in the previous stages of the receipt of the ASN-products (secondary alcohols, ketones, sulfones and other derivatives). These by-products are polar-active substances and, consequently, enhance the effects of polarization and coagulation molecules ASN, promoting a faster separation of the mixture to extract and rafinate phase.

A mixture of VI from the mixer 1 is directed to a gravity settling tank 2. Top extract phase V (solution NPC in gasoline fraction) is removed from the settling tank 2 in the regeneration of the extractant, and the lower rafinate phase VI (spirtually solution ASN mixed with NSO) from sump pump 4 serves under excessive pressure in the hydrodynamic nozzle 5. Here under isbyte or similar type, in the vortex chambers which due to the kinetic energy of the flow supplied to the linear velocity of 2.3 - 9.4 m/s is provided by regenerative elastic oscillation frequency 60 - 250 Hz.

Acoustic impacts cause structural and micellar polarization and increase the polarity of the system. It contributes to the destruction of the emulsion, the release and transfer in the extract phase and the molecules of the NSA, which is strongly adsorbed by the hydrophobic parts of the molecules of ACH.

Subjected to the hydroacoustic effects of a mixture of VIII served in the middle part of the Packed extraction columns 3. When contacting the mixture with a nozzle made of ceramic Raschig rings spirtually solution ASN coagulates in the film flowing down on the nozzle. Formed raffinata phase IX can be channelled into the system distillation of isopropyl alcohol and water. On top of the column 3 deduce the extract phase, which is fed to the mixing with the original spirtovanny solution I and fazeley water II before gravity settling tank 2.

The invention is illustrated by the following examples.

P R I m e R 1 (known way). In the middle part of the vertical sump capacity 38,0 m3served continuously 6175 kg/h sportowego solution ASN trace the e NSO and bottom - spirtually solution ASN, which is fed to the mixer where it adds fuseline water containing 5.2 wt. % Isopropyl alcohol. The volumetric ratio of solution ASN: vaselina water is 1: 0,6.

Dilute fazeley water spirtually solution ASN served in the top of a column with a diameter of 2000 mm and a height of 19546 mm, with four layers nozzles of Raschig rings 50 x 50 mm the Volume of the nozzle in the column is 18.8 m3.

In the bottom of the column serves to continuously mix the extract phase from the second column and fresh extractant (gasoline fraction 55 - 105aboutC). The volumetric ratio of solution ASN: extractant is 1: 0,64.

From the top of the column output extract phase containing 5.4 wt. % The NSA, which is sent to the regeneration of the extractant. From the bottom of the column output rafinate phase containing of 0.45 wt. % The NSA.

Rafinate phase fed into the top of the second column with a diameter of 1800 mm and a height 17310 mm, with a nozzle of Raschig rings 50 x 50 mm the Volume of the nozzle in the column is 11.5 m3.

In the bottom of the second column is injected continuously fresh extractant. The volumetric ratio of solution ASN: extractant is 1: 0,56. The total volume ratio of the solution ASN: extractant is 1: 1.2 NUU column. From a bottom of the second column output rafinate phase containing 0.16 wt. % The NSA, which after evaporation receive 2296 kg/h detergent "Progress", containing 31,2 wt. % surface-active substances (surfactants) and 0.75 wt. % (with respect to surfactants) GCS.

In the following examples used the original spirtually solution ASN, fuseline water and extractant of the same composition and quality as in example 1.

P R I m m e R 2 (known way). The extraction process carried out by the method described in example 1, but increase the load on spirtovodnogo solution ASN to 7790 kg/h

Determine the yield of detergent, the concentration of surfactant and the NSA.

P R I m e R 3. The proposed method of extraction GCS from sportowego solution ASN implemented as follows.

In the mixer serves continuously 7790 kg/h sportowego solution ASN, fuseline water and the extract phase from the extraction column containing 1.8 wt. % The NSA. The volumetric ratio of solution ASN: vaselina water is 1: 0,48. The mixture is fed to the middle portion of the vertical sump capacity 38,0 m3. From the top of the sump remove dissolved in the extractant NSO, the content of which is 12.2 wt. % . From the bottom of the sump deduce th nozzle. In the same nozzle under pressure serves extractant, maintaining the volumetric ratio of solution ASN: extractant 1: 0.56 and the flow rate in the inlet nozzles to 3.52 m/s

In the jet streams sportowego solution ASN and extractant generating elastic vibrations of a frequency of 93 Hz. The mixture from the nozzle is directed into the middle part of the extraction column with a diameter of 2000 mm and a height of 19546 mm, with four layers nozzles of Raschig rings 50 x 50 mm the Volume of the nozzle in the column is 18.8 m3. The mixture is injected into the space between the second and third layers of the nozzle.

The extract phase from the top of the column is directed to the mixing with the diluted fazeley water spirtovanny solution ASN. From the bottom of the column output rafinate phase containing 0,065 wt. % The NSA, which after evaporation receive 2926 kg/h detergent "Progress", containing a 33.2 wt. % Surfactant and 0.74 wt. % (with respect to surfactants) GCS.

P R I m e R s 4 - 9. The extraction process GCS from sportowego solution ASN carried out according to the method described in example 3, but change hydroacoustic impacts on the mixture flow in the nozzle.

Linear flow rate in the inlet nozzles of the nozzle change consistently, m/s: 2 the C: 60, 56, 140, 188, 250, 258.

In each example, determine the yield of detergent and its quality.

The table shows the conditions and results of the concrete implementation of known and proposed methods.

The table below shows that the positive effect of the proposed technical solution, in comparison with the known method is achieved when the linear flow rates in the inlet nozzles of the nozzle from 2.3 to 9.4 m/s and acoustic impact on the mix flows elastic oscillation frequency from 60 to 250 Hz.

Deviations in either direction from the proposed parameters of the hydroacoustic effects reduce the efficiency of the extraction process and some deterioration of the quality of the product.

When using the proposed method provided technical and economic effect by increasing the production of detergent, the reduction ratio of the extractant to the solution of ASN, decreasing the material of the extraction process. In addition, to stabilize the quality of the product. Savings per ton of produced product is about 8 - 9 RUB that to install medium-power network activity. Translation from Polish-ing. A. Century Of Plissa. Edited by Professor P. G. Romanova, L. , GHEE, 1963, S. 125-129.

Brownstein B. I. , Zheleznyak, A. C. Physico-chemical base solvent extraction. M - L. : Chemistry, 1966, S. 213.

EXTRACTION DESULFATION HYDROCARBONS from sportowego solution secondary alkyl sulphates of sodium by contacting with a hydrocarbon solvent and subsequent separation of the raffinate and extract phases, characterized in that the source spirtually solution secondary alkyl sulphates of sodium at first contact with fazeley water and the extract phase final stage is separated by settling the extract phase, and rafinate phase is mixed with a hydrocarbon solvent in the hydrodynamic nozzle at linear flow rates in the inlet nozzles 2,3 - 9.4 m/s and the acoustic impact of elastic oscillations of a frequency of 60 - 250 Hz.

 

Same patents:

FIELD: petrochemical industry; devices for a liquid by a liquid extraction.

SUBSTANCE: the invention is pertaining to the field of petrochemical industry, in particular, to a device for a liquid by a liquid extraction. The invention is dealt with a multiplate device for realization in a vertical column of multistage an extraction of a liquid by a liquid using a counterflow principle. The device contains: plates, and each plate after a fine setting in a column takes a horizontal position and is supplied with a seal ring, which adjoins the inside surface of the column; a perforated working area; a chordal up-going channel located on one side of a plate and a vertical bead retaining a liquid and surrounding the working area of the plate and spaced apart from the plate periphery closer to its center. The height of the upward directed bead is sufficient to retained a heavy liquid on a working area of the plate preventing is appearance on the edge of the plate, where a leakage downwards is possible because of availability of a gap between the edge of the plate and then inside surface of the wall of the column. The invention ensures more efficient prevention of the heavy liquid leakages through the tightness along the edge of the plate.

EFFECT: the invention ensures more efficient prevention of the heavy liquids leakages through the sealing-in along the edge of the plate.

6 cl, 5 dwg

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: method for extraction of aminonaphtholsulfoacids and aminophenolsulfoacids involves extraction with organic solvent wherein sodium dodecyl sulfate an aqueous solution is added to aqueous solution up to its concentration 1.5 x 10-4 mol/dm3, hydrochloric acid is added up to the concentration 1.5-1.6 mol/dm3. As extractant method involves using 1,4-dioxane in the volume ratio of extractant to sample = 1:10 and extraction is carried out from saturated solution of ammonium sulfate. Invention provides enhancing degree of extraction of aminonaphtholmonosulfoacids and aminophenolmonosulfoacids from aqueous solutions wherein extraction degree of sulfoacids is 96.1-99.6% after a single extraction. Invention can be recommended for concentrating 1-amino-2-naphthol-4-sulfoacid and 2-aminophenol-4-sulfoacid from treated sewage waters in manufacturing azodyes.

EFFECT: improved method for extraction.

1 tbl, 11 ex

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: invention describes a method for concentrating 1-naphthol-5-sulfoacid from aqueous solutions in the presence of ammonium sulfate. Method involves extraction with trioctylamine oxide solution taken in the concentration 0.5 mole/dm3 in toluene medium wherein trioctylamine oxide is impregnated preliminary in polyurethane foam and wherein the mass part of the solution with respect to polyurethane foam is 55-60%, and mass of impregnated tablets changes from 0.093 ± 0.001 to 0.096 ± 0.001 g per 25 cm3 of 1-naphthol-5-sulfoacid an aqueous solution. Extraction is carried out by extractive-sorption method. Under conditions of the complete extraction of 1-naphthol-5-sulfoacid from aqueous solutions the proposed method provides increase of the concentrating coefficient by above 5 times. Invention can be used in concentrating 1-naphthol-5-sulfoacid in analytical control of purified sewage in plants manufacturing dyes.

EFFECT: improved concentrating method.

2 tbl, 15 ex

FIELD: organic chemistry, analytical chemistry.

SUBSTANCE: method for concentrating hydroquinone from aqueous solutions involves extraction with an organic solvent wherein tributyl phosphate is used as an organic solvent that is applied preliminary of foam polyurethane in the mass ratio polyurethane foam : tributyl phosphate = 1:(2.5-3.0). Proposed method provides: to enhance the concentrating coefficient by 2.5-fold; to enhance extraction degree up to 96%; to exclude desalting agent from extraction system, and to reduce cost of analysis. Invention can be recommended for concentrating hydroquinone in analytical control of sewage feeding to biological treatment.

EFFECT: improved concentrating method.

1 tbl

FIELD: metallurgy; methods of extraction of vanadium from production solutions; vanadium production technology and analytical chemistry.

SUBSTANCE: proposed method consists in extraction of vanadium from production solution by di-2-ethyl hexyl phosphoric acid in organic diluent. Extraction is performed in presence of sodium sulfate in the amount of 0.5-0.8 mole/l at pH= 2.0-2.6.

EFFECT: facilitated procedure; complete separation of vanadium at simultaneous reduction of extracting agent consumption.

3 ex

FIELD: analytical chemistry, in particular organic material analysis.

SUBSTANCE: claimed method includes extraction with trioctylamine oxide (TOAO) in presence of ammonium sulfate, wherein mixture of trioctylamine oxide and melted cetyl alcohol in mass ratio of 15-20:85-80, respectively, is preliminary prepared, followed by dipping of sealed glass or polyethylene capsule having inner steel rod into obtained hot mixture. Further capsule with formed film containing trioctylamine oxide and cetyl alcohol is drawn out, cooled at room temperature and than placed in testing solution. Capsule is rotated at rate of 45-70 rpm for 20-25 min to concentrate naphtholmonosulfo acid and concentration coefficient K is determined by photometric method according to equation : K = mfilm/msol, wherein mfilm and msol are masses of mixed film of TOAO and cetyl alcohol and tested aqueous solution (g). Method of present invention is particularly useful in concentration of 1-naphthol-4-sulfonic acid, 1-naphthol-5-sulfonic acid, 2-naphthol-6-sulfonic acid in purified wastewater from azo dyes production. Said method makes it possible to increase of naphtholmonosulfonic acid concentration coefficient by 10 times and to decrease time of concentrate production by 3 times.

EFFECT: effective accelerated method for naphtholmonosulfonic acid concentration.

2 tbl, 13 ex

FIELD: separation.

SUBSTANCE: method comprises extracting elements from water solutions by organic solvent in the presence of a reagent from the set of derivatives of antipyrilmethane. The product of condensation of antipyrine with 2-methylpropanal is used as a reagent. The process is carried out at a temperature of 45-50°C with subsequent cooling of the products down to 10°C and formation of the melt of the extracting agent. The solvent is made of a mixture of bromoform and chloroform in a 1:10 ratio.

EFFECT: expanded functional capabilities.

1 dwg, 1 ex

FIELD: analytical methods.

SUBSTANCE: method of determining cobalt comprises extracting it from cyanate ion-containing solution with complexing agent and extractant followed by analysis of extract, said extractant and said complexing agent representing a mixture of fusible diantipyrylhexylmethane and benzoic acid taken in molar ratio 1:(0.25÷4), whereas extraction is effected at medium acidity expressed as 0.05-3.00 M HCl, after which extract is titrated.

EFFECT: increased selectivity and safety of analysis.

1 tbl

Extraction process // 2281136

FIELD: processes for extracting, separating and concentrating matters, namely liquid extraction.

SUBSTANCE: method comprises steps of cyclic cross oscillation of inter-phase surface of system. Oscillations of inter -phase surface are realized by means of two vibration oscillators mounted near wall of cell and spaced from it by distance preventing touching of cell walls and oscillators. Oscillators are arranged in such a way that axes passing though their mean zones cross in cell center for forming angle 130 - 140°. Spacing between oscillator and wall of cell is in range 4 - 6 mm.

EFFECT: accelerated mass transfer at extracting matters by liquid extraction process.

2 cl, 2 ex, 2 dwg

FIELD: technology for separation of two immiscible liquids or gas and liquid with simultaneous separation of one of liquid phases on light fraction and heavy fraction.

SUBSTANCE: method for processing two-phased mixtures of two immiscible fluid components includes stage of first gravitational separation of two-phased mixture with divide draining of first and second fluid components and second stage of gravitational separation, during which at least one first or second fluid component is divided with utilization of float and also at least one first or second fluid component is divided on light and heavy fractions with utilization output float with density, having value between density values of two liquid fractions. For realization of method device is utilized, including a dish with not less than two plates and with a set of first and second tubes, meant for inlet of fluid component and solid fluid component. Also no less than one tube has a narrowed portion inside with a float mounted above it.

EFFECT: possible continuous separation of incoming flow consisting of two liquid phases, with simultaneous separation of at least one of liquid phases in form of low density fraction and in form of high density fraction.

2 cl, 3 dwg

FIELD: analytical methods.

SUBSTANCE: naphtholmonosulfonic acids, in particular 1-naphtol-4 sulfonic acid and 1-naphtol-5-sulfonic acid, are isolated from treated waste waters from azo dye production. Isolation and concentration of acids is achieved by preliminarily adding N-cetylpyridinium chloride solution to aqueous solution of acids to obtain solution with concentration 1.2·10-4 M, after which hydrochloric acid solution is added to 1.0-0.1 M (pH 1-9). Extraction is effected with binary solvent mixture of acetone (41.0-41.5%) and diacetone alcohol (59.0-58.5%), whereas volume ratio of binary mixture to sample is 1:10. Ammonium sulfate is then used as salting-out agent.

EFFECT: achieved degree of isolation of naphtholmonosulfonic acids 98% and increased concentration factor to 17.

2 tbl, 27 ex

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: method involves addition of ammonium sulfate up to saturation to analyzed solution in the process of extraction and prepared solution is passed through sorbent-polycarbonate modified with 46.7-47.1 wt.-% of tributylamine at the rate 0.8-1 cm3/min in the mass ratio sorbent to sample = 1:10. Invention can be recommended for extraction naphthol- and phenolsulfoacids (2-naphthol-6-sulfoacid, 2-naphthol-6,8-disulfoacid, 1-amino-8-naphthol-3,6-disulfoacid, 1-amino-2-naphthol-4-sulfoacid, 2-aminophenol-4-sulfoacid, 2-ethylphenol-4-sulfoacid, phenol-4-sulfoacid and 5-aminosulfosalicylic acid) from treated sewage waters in manufacturing azodyes. In a single extraction method provides extraction of 84.0-99.9% of hydroxysulfoacids.

EFFECT: improved method for extraction.

1 tbl, 17 ex

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: method for extraction of aminonaphtholsulfoacids and aminophenolsulfoacids involves extraction with organic solvent wherein sodium dodecyl sulfate an aqueous solution is added to aqueous solution up to its concentration 1.5 x 10-4 mol/dm3, hydrochloric acid is added up to the concentration 1.5-1.6 mol/dm3. As extractant method involves using 1,4-dioxane in the volume ratio of extractant to sample = 1:10 and extraction is carried out from saturated solution of ammonium sulfate. Invention provides enhancing degree of extraction of aminonaphtholmonosulfoacids and aminophenolmonosulfoacids from aqueous solutions wherein extraction degree of sulfoacids is 96.1-99.6% after a single extraction. Invention can be recommended for concentrating 1-amino-2-naphthol-4-sulfoacid and 2-aminophenol-4-sulfoacid from treated sewage waters in manufacturing azodyes.

EFFECT: improved method for extraction.

1 tbl, 11 ex

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: process is carried out by preliminary mixing an aqueous solution with N-cetylpyridinium chloride aqueous solution in the ratio of molar concentrations of these solutions = 1:2.5 followed by extraction of aminonaphthol disuldoacids with a mixture consisting of 41.0-41.5 wt.-% of acetone and 58.5-59.0 wt.-% of diacetone alcohol in the presence of a desalting agent added up to saturation and representing ammonium sulfate. Extraction is carried out at pH = 7-8, the solution temperature 37°C and in the volume ratio of solvents mixture and an aqueous solution = 1:10. A single extraction procedure provides 96% extraction of aminonaphthol disulfoacids from aqueous solutions.

EFFECT: improved extraction method.

2 tbl, 13 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing the anhydride of trifluoromethanesulfonic acid used in organic synthesis. The disclosed method involves reaction of trifluoromethanesulfonic acid with phosphorus pentaoxide in molar ratio of phosphorus pentaoxide to trifluoromethanesulfonic acid in the range of 0.3 or less, while preventing hardening of the reaction solution due to formation of polyphosphoric acid during the reaction.

EFFECT: high efficiency in the process of producing anhydride of trifluoromethanesulfonic acid from trifluoromethanesulfonic acid and phosphorus pentaoxide.

3 cl, 5 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing tamsulosin hydrochloride. The method involves reaction of R-5-(2-aminopropyl)-2-methoxybenzene sulphonamide molar excess of 1-(2-bromoethoxy)-2-ethoxybenzene which ranges from about 1.3 to about 3, in an organic solvent. Said organic solvent is methanol. The method further involves purification of the obtained tamsulosin hydrochloride by recrystallising tamsulosin hydrochloride from a solution in methanol or ethanol or from a mixture of ethanol and methanol. Recrystallisation is carried out from a mixture of methanol and ethanol in ratio from about 3:7 to about 7:3.

EFFECT: high optical purity of the desired tamsulosin hydrochloride.

5 cl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining precursor compound of radioactive fluorine-tagged compound, of formula , which includes: stage of interaction, providing conditions for interaction of solution, which contains substance with the following chemical formula : where R1 represents protective group of carboxyl group, and R2 represents protective group of aminogroup together with base, selected from group, consisting of alkylamides, from primary to quaternary, with unbranched or branched chain with 1-10 carbon atoms, nitrogen-containing heterocyclic substances with 2-20 carbon atoms and nitrogen-containing heteroaromatic substances with 2-20 carbon atoms, and compound, reacting with OH-group of compound of chemical formula (1), with conversion into leaving group, selected from group, consisting of alkylsulfonic acid with unbranched or branched chain of 1-10 carbon atoms, haloalkylsulfonic acid with unbranched or branched chain of 1-9 carbon atoms, aromatic sulfonic acid and chloride of aromatic sulfonic acid; as well as stage of purification of reaction solution, obtained at the stage of interaction, to obtain practically individual stereoisomer of substance with the following chemical formula (2), where R1 represents protective group of carboxyl group, R2 represents protective group of amino group, and R3 represents leaving group.

EFFECT: elaborated is method of obtaining tagged precursor, convenient for obtaining amino acid, tagged with radioactive fluorine, used for positron-emission topography.

9 cl, 2 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for acrylamido-2-methylpropanesulfonic acid (A) salts preparation, comprising the following steps: preparation of a solution containing acrylamido-2-methylpropanesulfonic acid (A) salt impurities in an anhydrous organic solvent (L) using at least one basic component (B) selected from the group of alkali metal oxides, alkaline earth metal oxides, alkali metal hydroxides and alkaline earth metal hydroxides, at that, the molar ratio of the compound (A) and the basic component (B) is preferably from 1:1 to 1:3; if necessary, partial removal of the organic solvent (L) at a pressure in the range of 0.001 to 2 bar (abs.); separation of dissolved salts of the compound (A) by crystallization or precipitation as a result of changes in temperature and/or pressure and/or salt concentration in the solution; if necessary, drying of the purified acrylamido-2-methylpropanesulfonic acid (A) salt.

EFFECT: simple method for preparation of acrylamido-2-methylpropanesulfonic acid salts with high purity is provided.

9 cl, 4 dwg, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method for obtaining of a sulfonimide compound of the formula (Rf1-SO2)(Rf2-SO2)NH in an aqueous form, where Rf1 and Rf2 are independently selected from the group consisting of a fluorine atom and groups containing 1 to 4 carbon atoms selected from perfluoroalkyl, fluoroalkyl, from a mixture of M1 containing (Rf1-SO2)(Rf2-SO2)NH, Rf1SO2H and/or Rf2SO2H, Rf1SO2NH2 and/or Rf2SO2NH2. This method is characterized by comprising the step of M1 mixture oxidizing with an oxidizing agent to produce a M2 mixture containing (Rf1-SO2)(Rf2-SO2)NH, Rf1SO3H and/or Rf2SO3H and Rf1SO2NH2 and/or Rf2SO2NH2.

EFFECT: increased yield.

15 cl, 3 ex

FIELD: petroleum processing, petroleum chemistry.

SUBSTANCE: method involves extractive rectification of gasoline fraction and the following extraction of distillate with mixed solvent N-methylpyrrolidone - sulfolane. At stage of extractive rectification mixed solvent N-methylpyrrolidone - sulfolane containing 60-80 wt.-% of N-methylpyrrolidone is used, and at stage of extraction the same mixed solvent N-methylpyrrolidone - sulfolane containing 80-95 wt.-% of sulfolane is used. Method provides simultaneous isolation of highly purified aromatic (C6-C8)-aromatic hydrocarbons from gasoline fractions with the extraction degree 99.8%.

EFFECT: improved method for isolating.

2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention includes the primary methanol separation on the hydrophilic ultrafine or superfine fiber up to the residual methanol concentration no more than 250 mg/l of the liquid hydrocarbons, extraction of the methanol from liquid hydrocarbons with water, separation of the water solution of methanol from liquid hydrocarbons, removal of the purified hydrocarbons and water solution of methanol, if necessary the removal of the residual water solution of methanol from liquid hydrocarbons with sorption and following desorption and/or catalytical conversion obtaining hydrocarbons and water.

EFFECT: decrease of the energy consumption and efficiency increase in the process of liquid hydrocarbons purification from water methanol solution.

2 cl, 7 ex, 9 dwg

Up!