• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    A process for the preparation of 2-hydroxy-4-methylthiobutyric acid having improved color, odor and lower viscosity. 2-hydroxy-4-methylthiobutyronitrile is hydrolyzed with sulfuric acid having an initial strength of between about 50% by weight and about 70% by weight on an organic-free basis, thereby producing an intermediate aqueous hydrolysis product solution containing 2-hydroxy-4-methylthiobutyramide. The 2-hydroxy-4-methylthiobuty- ramide is hydrolyzed with sulfuric acid having a strength of between about 30% by weight and about 50% by weight on an organic-free basis to produce an aqueous hydrolyzate containing 2-hydroxy-4-methylthiobutyric acid. The hydrolyzate solution is contacted with a substantially water-immiscible organic solvent in a liquid-liquid extraction system to produce an extract comprising the solvent and 2-hydroxy-4-methylthiobutyric acid transferred from the hydrolyzate. The acid product is then recovered from the extract.
    公开号:SU1428193A3
    申请号:SU843812267
    申请日:1984-11-13
    公开日:1988-09-30
    发明作者:Рассель Вольф Лоренс；Артур Руст Деннис；Такано Масахару
    申请人:Монсанто Компани (Фирма)；
    IPC主号:
    专利说明:

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    This invention relates to an improved process for the preparation of 2-OXY-4- (methyltis) -butyric acid (HMBA), which can be used as an additive to feed, in particular for poultry.
    The aim of the invention is to improve the quality of the target product, i.e. having a lighter color, lower viscosity and better heat resistance, which is achieved by hydrolysis of 2-hydroxy-4 (methylthio) -butyronitrile (HMBN) first with 50-70% sulfuric acid at 25-65 ° C followed by treatment of the resulting 2 - lolsi-4- (methylthio) -butyramide 30 - sulfuric acid at 89-120 ° C extraction with water-immiscible organic solvent and reextraction of the target product in the presence of water in an amount of 5 - 12.2 wt.% based on the extract.
    Example 1. HMBN (132.10 g, 95% pure after gas chromatography), obtained from methyl mercaptan, acrolein and hydrogen cyanide, is added to a 50% -jioMy weight of an aqueous solution of sulfuric acid (196.14 g) at 50 ° C for -30 min in a flask with a jacket equipped with a stirrer with a capacity of 1000 ml. The resulting mixture was incubated for another 30 minutes at. The intermediate hydrolyzate is quickly heated to 90 ° C (within 20 minutes) and subjected to further reaction for 100 minutes at. After 13 minutes, phase separation occurs, where the organic layer containing HMBA is precipitated as a salt. Upon completion of the hydrolysis reaction, a 28% by weight ammoniacal solution (58.97 g) is added to the hydrolyzate at 80 ° C for 20 minutes. After adding a little more than half of the ammonia solution, small crystals precipitate from the aqueous phase. At the end of the addition of an immigrant at a pH of 1.76, due to strong crystallization, it was very difficult to mix the mixture.
    Three methods are used to extract HMBA from the by-products contained in the neutralized hydrolyzate.
    In the first of these methods, the neutralized hydrolyzate (50 mp, .63 g) is mixed with methyl propyl ketone (50 ml) and water (10 ml) to extract HMBA from the aqueous to the organic ketone phase. Ammonium sulphate crystals remain in the aqueous layer. Both phases are analyzed, the results of which are listed in Table 1.
    Table 1
    The solvent is evaporated from the organic phase under vacuum at 70 ° C for 60 minutes, then the vapor pressure is reduced to 16 mm Hg. abs The product is analyzed, it contains 75.5% by weight of HMBA monomer, 22.8% by weight of HMBA oligoners and 0.65% by weight of water. 88% by weight solution of HMBA in water has a color that shows a value of 5 on the Gardner scale.
    According to the second method of preparation, the neutralized hydrolyzate (50 ml) is mixed with methyl propyl ketone (50 ml) in order to extract HMBA. After mixing the hydrolyzate and solvent, the phase separation becomes difficult due to the high solids content. Upon completion of separation after settling overnight, the organic and aqueous phases are analyzed, the results of which are shown in Table 2.
    table 2
    The solvent is evaporated from the organic layer under vacuum for 60 minutes, the vapor pressure is reduced to 16 mm Hg, the NMVA product is analyzed at the bottom, it contains 74.9 wt.% NMVA monomer, 23, 7 wt. % oligomers HMBA and 0.60 weight. water. The color value of the 88% aqueous solution of HMBA product in water on the Gardner cabinet is from 4 to 5.
    In the third separation method, the neutralized hydrolyzate is distilled from volatile under vacuum at 60 minutes, and the vapor pressure is reduced to 15 mm Hg. abs In the distillation vessel, very thick sludge is formed. After filtering the solids, the filtrate is analyzed. It contains 75.2 wt.% Monomer NMBA, 20.2 wt.% Oligomers H # A and 3.28 wt. water. The 88% w / w solution of the HMBA product in water on the Gardner scale is 4 to 5.
     Example 2. HMBN (200), prepared according to the method of Example 1, is slowly added to a 50% by weight solution of sulfuric acid (299 g) at 50 ° C over 30 minutes in a 1000 ml jacket with a jacket. The resulting mixture was incubated for another 30 minutes. The resulting intermediate hydrolyzate is quickly heated to 90 ° C (for 20 minutes) and held for an additional 100 minutes. After 60 minutes at 90 ° C, the hydrolyzate becomes brownish in color. The final hydrolyzate consists of two phases.
    Without neutralizing the hydrolyzate, it is mixed with the same amount of methyl propyl ketone and, after separation of the phases, the solvent is distilled off in vacuo from the extract at 70 for 120 minutes. The resulting product contains 63.6 wt.% Monomer NMBA, 35.2 wt.% Oligomers HMBA, 0.11 wt.% HMBN, 0.61 wt.% Intermediate amide, 2.11 wt.% Water and 0, 27 wt.% Sulfate ions. The color of the 88% aqueous solution of the product on the Gardner scale is 5 to 6.
    Example 3. HMBN (656 g), prepared according to the method of Example 1, with stirring, is slowly added to a 50% aqueous solution of sulfuric acid (981 g) at 60 minutes in a 2 liter reactor,

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    equipped with a propeller stirrer. The resulting solution is held for another 30 minutes, then the reaction temperature is raised to 90 ° C for 26-30 minutes and held at 90 ° C for 120 minutes. At the end of the reaction, a portion of the hydrolyzate (1604.4 g) is mixed with methyl propyl ketone (1283.5 g) at 50-60 ° C in a 5 L separating vessel for approx. 10 minutes to extract the HMBA product from the hydrolyzate. Then the aqueous phase is removed from the vessel and the extract layer (2073.2 g) is washed with 1 water (207j5 g) at 50 ° C. The aqueous layer (48.8 g; 6.0% HMBA) is drunk from the vessel.
    The solution is evaporated from the extract under vacuum while continuing the distillation until the vapor pressure has dropped to 30 mm Hg. Water (20 ml) is then added to the residue under the surface and the temperature in the distillation vessel is raised to 70 ° C to distill off the residual solvent with steam. When the vapor pressure is reduced to 20 mmHg at 70 ° C, the steam distillation is complete. The pure product remaining in the still after distillation with steam distillation is analyzed. It contains 74.0% by weight of NMVA monomer, 24.4% by weight of NMZA oligomers, 1.8. wt.% water and 0.45 wt.% sulfate ions. This product is diluted with water to yield. 88% weight product HMBA, whose color on the Gardner scale is 5-6.
    P m -i mep 4. HMBN (263.16 g), obtained by the method of Example 1, was slowly added to a 65% by weight solution of sulfuric acid (301.45 g) at 50 ° C for 60 min in a 1000 ml jacket flask equipped with a stirrer. The resulting mixture was incubated for 30 min at 50 ° C. Water (1 of 8.91 g) is then added to the intermediate hydrolyzate to reduce the hydrolysis concentration of the acid to 40% by weight based on the absence of a nitrile. The temperature of the contents of the reactor is then increased from 50 to 90 ° C (for 25 minutes) and held for 115 minutes.
    514
    At the first stage of hydrolysis (i.e. during the reaction) in a 65% solution of sulfuric acid (initial concentration at 50 ° C), the viscosity of the CRTibHO reaction mixture rises and the reaction system begins to form two separate phases, one of which contains an intermediate 2- hydroxy-4-methylthiobutyramide, and the other - just added to the mixture HMBN.
    During the second phase of hydrolysis, i.e. during the conversion of the intermediate amide to the acid product at a temperature of 90 ° C, one phase is retained without all phase separation. At the end of the hydrolysis, the hydrolyzate is analyzed, it contains 35.21% by weight of HMBA monomer, 0.31% by weight of HMBA dimer, 0.01% by weight of HMBN and 0.01% by weight of intermediate amide.
    Another portion of the HMBA hydrolyzate of this example is extracted using different solvents.
    In each example, 100 weight.h. hydrolyzate mixed with 60 weight.h. the solvent in the separation vessel. After mixing and separation of the phases, 100 parts by weight the organic layer is washed with 12 wt.h. water and water raffinate (100 weight.h,) ,, washed 60 weight.h. solvent. All extractions are carried out at room temperature, i.e. at 25 ° C. For each solvent, the distribution coefficients at equilibrium with a mildew of PP-aqueous and aqueous phases are determined. The distribution distribution is determined by the concentration of HMBA in the organic phase in relation to the concentration of HMBA in the aqueous phase. The results of extraction with various solvents in this example are shown in Table 3.
    Table3
    Methyl ethyl ketone (79,) 5.4 14.6
    Methyl n-propyl ketone
    (102 C) 4.36.2
    Continuation of table 3

    2-Pentanol (118.9 s) 5.2 15.3
    n-Amyl alcohol (137, 5 C)
    n-Butyraldehyde (75.7 C) 1.4 Ethyl acetate (7 7.1 ° C)

    n-Butylacetate (126.5 ° C) 1.9 n-Propyl acetate (101.6 ° C) iso-Propyl acetate (90 ° C)
    Diethyl ether
    (34, 6
    Diisopropyl ether
    (68, 1
    Methylene chloride
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    2.1
    Example 5. Get HMBA as follows. In this system, the HMBA hydrolyzate is prepared in a batch reaction system consisting of a single reactor equipped with a stirrer, however, in two stages of the reaction. In the first stage, HMBN is slowly added to sulfuric acid, and an intermediate hydrolyzate is obtained containing
    2-hydroxy-4-methylthiobutyramide. The intermediate hydrolyzate is diluted with water and the temperature is raised to convert the intermediate amide to LMWL. The final hydrolyzate is served in an intermediate vessel. From there it is continuously fed to approximately the middle of the Karr extraction column with sieve trays, into which the solvent is fed near the bottom, and the wash water near the top. The overhead of the extract is preheated in a heat exchanger and fed to a steam distillation column. At the bottom of the column is a liquid product containing HMBA and water. The vapors from the top of the column are condensed in the condenser and sent to a separator, from which the solvent is recirculated to the bottom of the extraction column, and the water is recycled to the top of the extraction column for washing.
    The raffinate leaving the bottom extraction column is distilled with steam in the column to remove residual solvent from the vapors in the upper part of the column, which are also directed to the condenser, where they are condensed and fed to a separator. At the bottom of the column are wastewater that is disposed of.
    In a typical periodic hydrolysis of this example, 65.1 wt.% Sulfuric acid (142.3 kg) is fed to the reactor in step 1 and HMBN (120.1 kg) is slowly added to the reactor for 61 minutes at a temperature of 50 to 54 ° C. In stage 1A, the intermediate was diluted to an acid concentration of 40.1% (based on the absence of a nitrile), adding water and heating to 30 minutes. The hydrolyzate is then kept at 90 ° C for 75 minutes. The volatile components are then removed, gradually reducing the pressure to about 110 mm Hg. abs for approx. 45 minutes, lowering the temperature to about. Approximately 11 kg of substance volatilizes. Then the hydrolyzate is poured into the intermediate vessel.
    The final hydrolyzate from the intermediate vessel is continuously fed to the column in an amount of 181 g / min and methyl isobutyl ketone solvent (MIBK) is fed to the bottom of the extract
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    100 g / min. Wash water is introduced into the top of the column. In the column, continuous countercurrent extraction is carried out approximately at the time of reciprocating plates with 140-228 blows per minute, obtaining an extract that is removed from the top of the column, and an aqueous raffinate, which is removed from the bottom of the column. The extract preheated in the heat exchanger is fed to a steam distillation column, where the solvent is distilled off at a pressure of mm Hg. in the upper part, at 82 C in the upper part of the column and in the lower part of the column, obtaining a lower product in the amount of 78 g / min, which consists of an aqueous solution of HMBA. Vapor from the top, containing 100 g / min of MIBK and 50 g / min of water, is condensed in a condenser and fed to a separator.
    The raffinate from the bottom of the column is subjected to distillation with water vapor in the column at a pressure in the upper part of the Ko-f of the core of 760 mm Hg, a top temperature of 97 ° C and a temperature in the vessel, obtaining steam in the upper part containing 0.9 g / MIBK mines and 5 g / min water, which are mixed with vapors from the top of the column, are condensed in a condenser and sent to a separator. By distillation of the raffinate in a column at the bottom of the column, 144 g / min is obtained, which is sent to waste.
    The extraction column is a Carr column with a sieve tray with a diameter of 2.54 cm and a height of 2.1 m.
    After reaching a stabilized state, the hydrolyzate coming from the vessel and the aqueous product from the bottom of the distillation column are periodically withdrawn for analysis. The results of the analyzes are given in table 4.
    Table 4
    55
    Monomer PMBA 33.9-35.1 72.8-80.2 According to Indicator OligomersHMBA 4,, 2, 9lO
    Color (according to Gardner)
    3.5-5.5
    Example 6. A hydrolyzate is prepared according to the method of Example 5. A hydroligate is fed to the Karr extraction column in an amount of 204 g / min. The column is operated at C C, the solvent MIBK is introduced in an amount of 112 g / min and the wash water in an amount of 23 g / min, the syringe plate is wiped with 170 beats per minute, an extract is obtained which is preheated to 99.5 ° C at absolute pressure 451 mm Hg and directing the p distillation column for the extract. At the top of the column, the pressure is 451 mm Hg. and a temperature of 99.5 ° C in a vessel — a temperature of 102 ° C; in the bottom of the column a concentrated aqueous product HMBA is obtained in an amount of 94.0 g / min. In the upper part of the distillation column, 112 g / m MIBK and 42.5 g / min water are formed for the extract. These vapors are mixed with the upper vapors from the raffinate distillation, condensed and fed to a separator. The raffinate formed at the bottom of the extraction column is fed to the raffinate distillation column, removing the solvent by distillation at a pressure of 451 mm Hg. and the temperature at the top of the column and at 94 ° C at the bottom of the column. At the top of the column, vapors of 0.7 g / min MIBK and 12.5 g / min water are formed. These vapors are mixed, with the upper vapors from the distillation distillation column, condensed and fed to a separator. At the bottom of the raffinate distillation column, waste water amounts to 129.0 g / min, which is removed.
    After the stabilization state has reached in this example, samples of the product are taken periodically.
    and analyze. Table 5 shows the results of these analyzes.
     T a b l and c a 5

    HMBA 41,, 687,, 9
    Water 25, 611.8-12.2
    Sulfate ion 27,, 90,, 62
    Monomer NIWA -74,9-75,4
    Oligomers HNMVA -13,, 0
    Color - (according to Gardner) - 3
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    Example 7. 63.1% by weight of a solution of sulfuric acid (1555 g, containing 980 g, i.e. 10 moles of sulfuric acid) are fed to a reactor equipped with a 5L stirrer. Within one hour, HMBN (1310 g; 10 mol) is added to sulfuric acid in a reactor at 50 ° C, while the reactor is cooled with an ice bath. Upon completion of the addition of the nitrile, the resulting mixture was kept at 50 ° C for half an hour, then water (900 g) was added and the resulting diluted mixture (40% by weight of sulfuric acid based on the absence of nitrile) was heated to 90 ° C for one hour and another hour is kept for the purpose of converting the amide to the acid product.
    The final hydrolyzate is evaporated under vacuum at 70-90 0 until the final pressure of 100 mm Hg is reached, and 37 g of volatiles are removed. During the removal of volatile from hydrolyzate, a small amount of solids was precipitated, 2.2 g of water was added to dissolve the solids.
    HMBA is isolated from the hydrolyzate portion, working with the extraction extraction system on four stages. According to this example, the hydrolyzate (200 g) and MIBK (40 g) are mixed in a first stage to obtain an extract and a raffinate. A portion (100 g) of the refinery is served together with MIBK (20 g) to the second stage. After the extract in the second stage, 85 g of the second stage raffinate is sent to the third stage, where it is mixed with an additional portion of MIBK (17 g). After extracting the extract in the third stage, 70 g of the third stage raffinate is mixed with MIBK (H g) in the fourth stage. All extractions are carried out at room temperature. After separation of the phases at each stage of extraction, the phases of the extract and the raffinate are analyzed with respect to HMBA, the results are shown in Table 6.
    Table 6
    Example 8. HMBN (107.6 kg) is added to a 64.9% by weight solution of sulfuric acid (123.9 kg) in an enamelled reactor with a capacity of 38 liters, equipped with an external heat exchanger, a circulation pump and pipelines for circulation and cooling the contents of the reactor. Nitrile is added over 59 minutes. During the first nine minutes, the mixture is heated from 30 to 60 ° C and during the last 50 minutes the temperature is maintained at 60 ° C. After the addition of the nitrile is complete, the mixture is stirred for another 15 minutes at 60 ° C to obtain an intermediate hydrolyzate. Water (77.2 kg) is then added to a reaction mixture containing 40% by weight sulfuric acid based on the absence of a nitrile, and the resulting mixture is heated from 60 to 89 ° C over 30 minutes. The mixture is then held for another 88 minutes at 89 ° C to obtain the final hydrolyzate containing HMBA.
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    Upon completion of the hydrolysis, the contents of my reactor are treated under vacuum, evaporating 21 pounds (9.5 kg) of water and volatiles.
    After distillation, the volatile hydrolyzate in an amount of 204 g / min is introduced into an extraction column with perforated plates with a diameter of 2.54 cm, in place 61 cm below the top of the set of plates 244 cm. Water (23.5 g / min) and MIBK are fed into the top of the column. (112 g / min) served to the bottom. MIBK was a continuous phase in the extraction zone. The extraction column operates at a temperature of about. The extract from the top of the column passes through a preheater, where it is heated to 115 ° C at atmospheric pressure. Under these conditions, a significant amount of MIBK is evaporated. The remaining liquid organic phase is fed to the top of the distillation column with a diameter of 7.6 cm and a height of 229 cm with a metal canon protruding 0.64 cm.
    19 g / min steam is supplied to the bottom of the column. The pressure at the top of the column is atmospheric and the temperature at the bottom of the column is 116 ° C. The bottom product is analyzed, it contains 88.9% HMBA, 0.56% sulphate ions and water. Colour . the product on the gardner scale is 4.
    Example 9- HMBA hydrolyzate is prepared according to the method of example 8. The hydrolyzate is extracted, feeding it in an amount of 201 g / min to an extraction column with a diameter of 2.54 cm with sieve plates, in place 61 cm below the top of a set of plates 244 cm. in the amount of 22.5 g / min and MIBK is introduced in the bottom of the column in the amount of 111 g / min. The solvent phase was a continuous phase in the extraction zone. The column operated at a temperature of about.
    The top extract of the extraction column is fed to a heat exchanger where it is heated to 71 ° C at 147 mm. A significant amount of MIBK is evaporated under these conditions and the residual liquid phase is fed to the top of a distillation column of the type described in Example 8. The bottom of the column is. The steam is supplied in the amount of 28.5 g / min.
    The pressure at the top of the column is 147 mm Hg.
    In the lower part, a product is obtained which according to the analysis contains 89.0% by weight of HMBA, 0.54% by weight of sulphate ions and water.
    Example 10. HMBN (approx. 200 g) obtained by the method described in Example 1 was slowly added to a 50% by weight solution of sulfuric acid (299 g) at. The resulting mixture is reacted for a period sufficient to convert the total amount of HMBN to 2-hydroxy-4- (methylthio) butyramide. The intermediate hydrolyzate is rapidly heated to
    temperature about 120 ° C and subjected to reaction during the period
    sufficient dp converting the total amount of intermediate amide to HMBA. The resulting product NMBA for; that of the final hydrolytic
     according to the method described in example 5.
    Example 11. HMBN (approx. 200 g) obtained by the method described in Example 1 of the description is slowly added to a 70% kacce solution of sulfuric acid (214 g) at 25 seconds. The resulting mixture is reacted for a period sufficient to convert the total amount of HMBN to 2-OXY-4- (methylthio) butyramide. The intermediate hydrolyzate is diluted to a sulfuric acid concentration of 30% by weight (based on the absence of nitrile) by adding
    Known 109
    Proposed 90
    Thus, the results of the tests show the advantages of the composition obtained according to
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    after birth, it is then rapidly heated to about a temperature and reacted for a period sufficient to convert the total amount of intermediate amide to HMBA. The resulting HMBA product is then extracted from the final hydrolyzate according to the method described in Example 5.
    Analysis of the composition of HMBA prepared according to a known method was carried out in the same manner as the analysis of the composition prepared according to the proposed method. The known composition was diluted with water to obtain an aqueous solution containing 89% by weight of 2-hydroxy-4- (methylthio) butyric acid, as determined by standard titration of Br / Br-Oz. The kinematic viscosity was determined when the color was evaluated by the Gardner color index (range of values from 1 to 18). The ratio of monomer to HMBA oligomers was determined by gas chromatography. Relative stability was determined by the temperature at which gas evolution began when the sample was subjected to calorimetry with increasing acceleration. The results of the above analysis are presented in Table 7. The odor comparison of the two samples was qualitatively carried out in such a way that the equilibrium vapor was brought into contact with the olfactory organs. There was no significant difference in odor.
    Table 7.
    3.38 18+ 165 2.8 10 150
    The invention, compared with the composition of a known method, While the data do not confirm a significant improvement in odor, the known composition yielded to the proposed in visibility and color value. These two properties are most important, and the improvement of these properties, along with an increase in the ratio of monomer to oligomers, leads to an improved composition.
    权利要求:
    Claims (1)
    [1]
     Invention Formula
    The method of producing 2-hydroxy-4- (methylthio) butyric acid by hydrolysis of 2-OXY-4- (methylthio) -butyronitrile with an aqueous solution of sulfuric acid using heat followed by
    extraction with immiscible iodine organic solvent and reextraction of the target product, characterized in that,. In order to improve the quality of the target product, hydrolysis of 2-hydroxy-4- (methylthio) -butyronitrile is first carried out with 50-70% sulfuric acid at 25-65 ° C, followed by treatment of the 2-hydroxy-4- (methyl thio ) -butyramide with 30–50% sulfuric acid at 89–120 ° C, and the reextraction is carried out in the presence of water in an amount of 5–12.2 wt.% in pe- ce4 efe per extract.
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP0142488B1|1987-08-26|
    AT29131T|1987-09-15|
    GB8428657D0|1984-12-19|
    AU562078B2|1987-05-28|
    EP0142488A3|1985-06-26|
    JPH0797970B2|1995-10-25|
    ZA848847B|1985-09-25|
    AU3535984A|1985-05-23|
    MX163989B|1992-07-07|
    EP0142488A2|1985-05-22|
    US4524077A|1985-06-18|
    GB2149791B|1988-04-20|
    JPH051787B2|1993-01-11|
    CA1263668A|1989-12-05|
    JPS60156396A|1985-08-16|
    GB2149791A|1985-06-19|
    KR870000657B1|1987-04-04|
    DE3465592D1|1987-10-01|
    JPH05211846A|1993-08-24|
    KR850004108A|1985-07-01|
    引用文献:
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    BE611435A|1960-12-14|1962-06-12|Stamicarbon|Process for the preparation of metal salts of alpha-hydroxy-gamma -methylmercaptobutyric acid|
    US3773927A|1971-12-20|1973-11-20|Du Pont|Preparation of an aqueous slurry of ammonium chloride and methylmercapto-hydroxybutyric acid|
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    申请号 | 申请日 | 专利标题
    US06/550,857|US4524077A|1983-11-14|1983-11-14|Liquid 2-hydroxy-4-methylthiobutyric acid and process for the preparation thereof|LV920384A| LV5669A3|1983-11-14|1992-12-22|Substance for the production of 2-oxy-4--butter|
    LTRP250A| LT2074B|1983-11-14|1992-12-22|2-OKSI-4--GENED SUGAR RECEIVING BUDGET|
    MD94-0074A| MD54C2|1983-11-14|1994-04-07|Process for 2-oxi-4- butyric acid obtaining|
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