CN104591997B - A kind of method of extracting and refining long-chain biatomic acid - Google Patents

A kind of method of extracting and refining long-chain biatomic acid Download PDF

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CN104591997B
CN104591997B CN201310532059.0A CN201310532059A CN104591997B CN 104591997 B CN104591997 B CN 104591997B CN 201310532059 A CN201310532059 A CN 201310532059A CN 104591997 B CN104591997 B CN 104591997B
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chain biatomic
biatomic acid
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CN104591997A (en
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高大成
李晓姝
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
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Abstract

The invention discloses a kind of extracting and refining long-chain biatomic acid method.The method includes: long-chain biatomic acid terminates fermentation liquid and carries out pretreatment, after acidifying, extracts through organic solvent, adds emulsifying agent and alkaline solution processes, be then acidified with mineral acid after adsorption treatment, then decrease temperature crystalline, obtains long-chain biatomic acid product.Compared with prior art, used by the inventive method, inventory is few, is lost low, low cost, and the purity of obtained long-chain biatomic acid is high, and total nitrogen content has reached polymer grade requirement, has been suitable for industrialized production.

Description

A kind of method of extracting and refining long-chain biatomic acid
Technical field
A kind of method that the present invention relates to extracting and refining long-chain biatomic acid, the method particularly obtaining high purity long chain binary acid from fermentation liquid.
Background technology
The long-chain biatomic acid general molecular formula of indication of the present invention is CnH2n-2O4, wherein n is 10-18, is that microorganism utilizes the fermentation such as liquid wax and the metabolite that obtains.Its fermentation liquid is complicated heterogeneous system, the culture medium wherein contain unreacted carbon source, microbial cell and fragment, not utilizing and metabolite and the secretions etc. of microorganism, wherein contain the impurity such as a large amount of protein, pigment, have a strong impact on purity and the application of product, and bring difficulty with refined to the extraction of this kind long-chain biatomic acid.
At present, on market the highest to this kind long-chain biatomic acid purity requirement, the particularly purity requirement of polymer grade is higher, typically require that the total acid purity of binary acid is at more than 99.0wt%, total nitrogen ＜ 30 g/g, the most only purify with organic solvent method to obtain and meet this polymer grade product required, and generally, even if purity reaches requirement, its total nitrogen and protein content are still relatively inaccessible to requirement, if total nitrogen content is higher than index in binary acid, the colourity of polymerization product and mechanical property can be caused the biggest impact.
Long-chain biatomic acid is the fine chemical product that a class has important and extensive industrial use.The process for refining of fermentative Production long carbochain biatomic acid product mainly has Aqueous phase and solvent method at present.
Aqueous phase refining long-chain biatomic acid refers to that whole processing procedure is carried out in aqueous phase, this method is not so good as solvent method to the removal effect of pigment, mostly being water solublity plus albumen contained in fermentation liquid, the product purity that therefore Aqueous phase prepares compared with solvent method is relatively low, and appearance luster and grain size number are poor.The advantage of Aqueous phase is to need not use organic solvent, and equipment investment is the fewest, and operating process is simple, safety, little to operator and environmental pollution, it is adaptable to the production of the product that prescription is relatively low.
The product purity that solvent method prepares is high, color and luster is good, crystal size is uniform, can be used directly to synthesize middle and lower reaches product.But solvent method is during refining long-chain biatomic acid, crystallizing in wet product containing substantial amounts of solvent, all volatilize in dry run, even if increasing solvent recovery unit, also having partial solvent loss, will necessarily be to environment.
In long-chain biatomic acid process for purification disclosed in CN201010564316.5, comprise the following steps: the filtrate after being fermented by long-chain biatomic acid mixes temperature 40 ~ 100 DEG C with extractant, and add mineral acid acidified, regulation pH value is 2 ~ 6, extractant and filtrate is adequately mixed, stand after carry out liquid-liquid separation, take extraction phase crystallisation by cooling, be dried after removing solvent, obtain the product purified.Its solvent selection is the alcoholic solvent of more than C4, and the pH of extraction is 2 ~ 6.It has the drawback that under this condition of acidic pH, selecting alcohols solvent extraction long-chain biatomic acid, esterification easily occurs, the long-chain biatomic acid ester of generation makes the purity of the mono-acid of long-chain biatomic acid reduce, have impact on the application as polymer raw, and its method is merely to obtain thick product.
In long-chain biatomic acid process for purification disclosed in CN201210027749.6, comprise the following steps: first with mineral acid, long-chain biatomic acid salt is fully converted to long-chain biatomic acid, extract with organic solvent again, then by the way of crystallisation by cooling or heating evaporation, obtain long-chain biatomic acid product.The total nitrogen content of the long-chain biatomic acid that the method obtains, generally more than 30 g/g, does not reaches polymer grade product standard, and then affects its application.And no matter using which kind of solvent, all can contain substantial amounts of solvent in the product being filtrated to get, this partial solvent all volatilizees when dry products, even if increasing solvent recovery unit, also have partial solvent loss, will necessarily be to environment.
In long-chain biatomic acid process for purification disclosed in CN99113296.3, comprise the following steps: after processing fermentation liquid with extractant, by back extraction method, dicarboxylic acid product is transferred to aqueous phase from organic facies again, be then passed through acid out, filtration, drying and other steps obtain dicarboxylic acid product.Its shortcoming is: pH value during back extraction is 9-12, and this can make the esters solvent in solvent phase be easier to hydrolysis, and bases consumption is big, and correspondingly during acid out, acid amount used is also big, and in produced sewage, salt content is higher, adds the processing cost of sewage.
Summary of the invention
For the deficiencies in the prior art, a kind of method that the invention provides extracting and refining long-chain biatomic acid, the Dominant Facies of solvent refining with aqueous phase process for refining is combined, to obtain polymer grade long-chain biatomic acid product, and obtains higher back extraction yield under the conditions of using emulsifying agent.Compared with prior art, used by the inventive method, inventory is few, is lost low, low cost, and the purity of obtained long-chain biatomic acid is high, and total nitrogen content has reached polymer grade requirement, has been suitable for industrialized production.
The extracting and refining long-chain biatomic acid method of the present invention, including:
I, long-chain biatomic acid is terminated fermentation liquid carry out pretreatment to remove solid thalline and liquid wax；
II, acidifying make long-chain biatomic acid crystallization, it is thus achieved that long-chain biatomic acid water of crystallization solution；
III, by long-chain biatomic acid water of crystallization solution filter, the long-chain biatomic acid filter cake obtained or long-chain biatomic acid water of crystallization solution mix with organic solvent makes long-chain biatomic acid dissolve；
After organic phase washed with water after IV, separation, add adsorbent, filtering and removing solid content；
V, in the organic facies that step IV obtains, add emulsifying agent and alkaline solution, system temperature is 75 DEG C ~ 100 DEG C, pH be value be 5.8 ~ 7.0, response time is 15 ~ 30min, then the reaction temperature of system is improved to 105 DEG C ~ 135 DEG C, time of repose is 15 ~ 60min, is isolated to the aqueous phase containing long-chain biatomic acid mono-salt；The described alkaline solution solution of one or more in sodium bicarbonate, sodium carbonate, sodium hydroxide, potassium bicarbonate, potassium carbonate, potassium hydroxide, it is preferably sodium hydroxide, the mass concentration of alkaline solution is 10% ~ 40%, and the alkali number of addition and long-chain biatomic acid butt mol ratio are 0.9 ~ 1.1；Emulsifying agent is nonionic emulsifier, and the consumption of emulsifying agent makes its concentration in system be 30 ~ 500 g/g, preferably 110 ~ 200 g/g；
VI, in the aqueous phase of step V gained add mineral acid, the pH value making system is 3.0 ~ 4.5, and the temperature of system is 85 DEG C ~ 100 DEG C, obtains long-chain biatomic acid crystal solution.
VII, filter time the long-chain binary crystal solution of step VI gained is cooled to 40 DEG C ~ 60 DEG C, it is thus achieved that long-chain biatomic acid filter cake, be washed with water and wash filter cake to neutral, be finally dried to obtain long-chain biatomic acid product.
In the inventive method, terminating fermentation liquid described in step I is the metabolite that microorganism utilizes that the fermentation of liquid wax obtains, and the long-chain biatomic acid general molecular formula wherein contained is CnH2n-2O4, wherein n is 10-18, and organic acid can be single a kind of long-chain biatomic acid, it is also possible to be hybrid long chain dicarboxylic acid.After terminating fermentation liquid heat inactivation, can carry out the impurity such as filtering and removing thalline, filtration can use the conventional methods such as membrane filtration and equipment.Heat inactivation temperature is generally 75 DEG C～100 DEG C.
In the inventive method, described acidifying uses conventional method to carry out.Acid used by acidifying can be the mineral acid such as H of any concentration2SO4、HNO3, HCl or H3PO4.The pH value of described acidifying is 3.0 ~ 4.5.
Organic solvent used by step III is preferably ethers, for propyl ether, butyl ether, diisobutyl ether, amyl ether, isoamyl oxide, hexyl ether one or more.Preferably one or more of n-butyl ether, diisobutyl ether, isoamyl oxide etc..In the inventive method, organic solvent is 2:1 ~ 7:1 with the weight ratio of long-chain biatomic acid butt.Long-chain biatomic acid dissolves the most in a heated condition with organic solvent, and heating-up temperature is generally 80 DEG C ~ 150 DEG C, preferably 85 ~ 120 DEG C, determines with specific reference to the boiling point selecting solvent, generally below the boiling temperature of used solvent.
In the inventive method, step IV can add deionized water wash organic facies once or more, and isolate aqueous phase.
In the inventive method, the adsorbent in step IV is one or more in activated carbon, active hargil etc., preferably activated carbon, and addition is the 0.01wt% ~ 2.0wt% of long-chain biatomic acid butt weight, preferably 0.01wt% ~ 1.0wt%, and adsorption time is 30min ~60min。
In step V, nonionic emulsifier used is OPEO and sorbitan fatty acid ester, wherein the OPEO medium vinyl degree of polymerization is preferably 4, sorbitan fatty acid ester is preferably S-40, S-60 and S-80 type, addition makes its concentration in system be 30 ~ 500 g/g, preferably 110 ~ 200 g/g.
In the inventive method, the organic facies of isolated in step V, can recycle.
The inventive method can obtain the long-chain biatomic acid product of highly purified single kind, it is also possible to obtain hybrid long chain dicarboxylic acid product.
Compared with prior art, the inventive method has the advantage that
(1) in step V of the present invention, system adds a certain amount of nonionic emulsifier, the long-chain biatomic acid in organic solvent can be enable sufficiently to react generation long-chain biatomic acid mono-salt with the alkali in aqueous phase, the most compared with prior art, the purpose of purification long-chain biatomic acid can be reached, and the yield of long-chain biatomic acid is high in the case of the alkali number saving nearly half and acid amount, loss is few, also reduces the pollution to environment.
(2) present invention uses ethers as organic solvent, and compared with employing acetate solvate in current industry, ether solvent is to equipment non-corrosiveness, and equipment investment cost is lower；Compared with the technology using alcohols or esters solvent refining long-chain biatomic acid, ether solvent chemical stability under acid or alkali environment is more preferable, and not with long-chain biatomic acid generation side reaction so that product is more suitable for the raw material as polyreaction.
Ether solvent is refined binary acid by the present invention and anti-extraction process process combines so that the total acid purity of long-chain biatomic acid improves relatively big, has reached more than 99.5%, and it is also obviously that the quality of the polymerization products such as follow-up synthesizing engineering plastic is affected by this.
The present invention passes through optimizing process, obtains the total acid purity long-chain biatomic acid product more than 99.5%, and total nitrogen content is at 10 below g/g.
Detailed description of the invention
The process for purification of the present invention is further illustrated below by embodiment.In the present invention, wt% is mass fraction.
In the inventive method, containing liquid wax, thalline, the culture medium not utilized, metabolite and microorganism secretion thing etc. in fermentation liquid, wherein contain the impurity such as a large amount of protein.Long-chain biatomic acid fermentation liquor pretreatment can use this area usual way, as used at least one scheme following:
(1) termination fermentation liquid heated and stand, dividing the liquid wax going to upper strata, then cooling filtration sterilization, obtain the filtrate containing long-chain biatomic acid salt of clarification.
Actual conditions is: will terminate fermentation liquid heat 85 DEG C ~ 100 DEG C, stand about 2h, then divide the liquid wax that upper strata remain, then be cooled to 60 DEG C ~ 80 DEG C, through microfiltration with or ultrafiltration apparatus, be filtered to remove the impurity such as thalline and obtained cleaner liquid.
(2) termination fermentation liquid is heated to 75 DEG C ~ 90 DEG C, enters microfiltration or ultrafiltration apparatus, remove thalline and liquid wax etc., obtain the filtrate containing long-chain biatomic acid salt of clarification.
Embodiment 1
Take 2000ml and obtained C by Candida tropicalis fermentation12H22O4Fermentation liquid, concentration is the fermentation liquid of 160g/L.Fermentation liquid will be terminated and heat 85 DEG C, and stand about 2h, then divide the liquid wax that upper strata remains, then be cooled to 70 DEG C, be filtered to remove the impurity such as thalline through microfiltration and obtained cleaner liquid.H is added in filtrate2SO4Regulation pH value is to 2.5, and is heated to 90 DEG C, obtains C12H22O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
C12H22O4Filter cake and diisobutyl ether (diisobutyl ether and C12H22O4Weight ratio is 7:1) mixing, and it is heated to 90 DEG C, and static 30min, point sub-cloud aqueous phase；In solvent phase, add 300mL deionized water wash organic facies again, again divide aqueous phase；With backward organic facies adds 0.3g activated carbon insulation decolouring 30min, then it is filtered to remove activated carbon.
Organic facies after decolouring adds OPEO 110 g/g and the 3800mL deionized water of the degree of polymerization 4, at 90 DEG C, is 6.3 with 30wt%NaOH regulation pH, after stirring mixing 15min, be warming up to 110 DEG C and stand 30min layering, reclaim upper strata solvent.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 3.0, after being heated to 95 DEG C, be incubated 30min, afterwards by C12H22O4Aqueous solution slow cooling is to 55 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Embodiment 2
Take 2000ml and obtained C by Candida tropicalis fermentation12H22O4Fermentation liquid, concentration is the fermentation liquid of 160g/L.Fermentation liquid is heated to 85 DEG C, enters micro-filtration, remove thalline and liquid wax etc., obtain the filtrate containing long-chain biatomic acid salt of clarification.H is added in filtrate2SO4Regulation pH value is to 3.0, and is heated to 95 DEG C, obtains C12H22O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
By C12H22O4Filter cake and n-butyl ether (n-butyl ether and C12H22O4Weight ratio is 6:1) mixing, and it is heated to 95 DEG C, and static 30min, point sub-cloud aqueous phase；In solvent phase, add 280mL deionized water wash organic facies, again divide aqueous phase；In organic facies, add 0.2g activated carbon insulation decolouring 30min, be then filtered to remove activated carbon.
Organic facies after decolouring adds S-60 type sorbitan fatty acid ester and the 4000mL deionized water of 120 g/g, at 95 DEG C, regulating pH with 10wt%KOH under stirring is 6.5, after stirring mixing 20min, it is warming up to 110 DEG C and stands 30min layering, reclaim upper strata solvent.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 3.5, after being heated to 95 DEG C, be incubated 30min, afterwards by C12H22O4Aqueous solution slow cooling is to 50 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Embodiment 3
Take 2000ml and obtained C by Candida tropicalis fermentation13H24O4Fermentation liquid, concentration is the fermentation liquid of 154g/L.Being heated to 70 DEG C, through ceramic micro filter membrane filtration, the liquid wax of removing thalline and remnants obtains filtrate.H is added in filtrate2SO4Regulation pH value is to 2.4, and is heated to 95 DEG C, obtains C13H24O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
The C obtained13H24O4Filter cake and n-butyl ether (n-butyl ether and C13H22O4Weight ratio is 4:1) mixing, it is mixed and heated to 105 DEG C, static 45min, point sub-cloud aqueous phase；In solvent phase, add 310mL deionized water wash organic facies again, again divide aqueous phase；Add 0.15g activated carbon insulation decolouring 30min to organic facies, be then filtered to remove activated carbon.
Organic facies after decolouring adds OPEO 130 g/g and the 3200mL deionized water of the degree of polymerization 4, at 95 DEG C, under stirring, uses 15wt%Na2CO3Regulation pH to 6.4, after stirring mixing 20min, is warming up to 125 DEG C and stands 20min layering, reclaim upper strata solvent.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 4.0, after being heated to 90 DEG C, be incubated 30min, afterwards by C13H22O4Aqueous solution slow cooling is to 45 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Embodiment 4
Take the C that 2000ml concentration is 145g/l14H26O4Fermentation liquid, is heated to 70 DEG C, and through ceramic micro filter membrane filtration, the liquid wax of removing thalline and remnants obtains filtrate.H is added in filtrate2SO4Regulation pH value is to 2.4, and is heated to 95 DEG C, obtains C14H26O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
The C obtained14H26O4Filter cake and isoamyl oxide (isoamyl oxide and C14H22O4Weight ratio is 6:1) mixing, and it is heated to 104 DEG C, and static 30min, point sub-cloud aqueous phase；In solvent phase, add 280mL deionized water wash organic facies again, again divide aqueous phase；In organic facies, add 0.20g activated carbon insulation decolouring 30min, be then filtered to remove activated carbon.
Organic facies after decolouring adds 150 g/g S-40 type sorbitan fatty acid ester and 3000mL deionized waters, at 95 DEG C, under stirring, uses 5wt%NaHCO3Regulate pH to 6.3, after stirring mixing 20min, be warming up to 130 DEG C, stand 25min layering, divide and go upper strata solvent phase.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 3.3, after being heated to 97 DEG C, be incubated 30min, afterwards by C14H22O4Aqueous solution slow cooling is to 45 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Embodiment 5
Taking the hybrid long chain dicarboxylic acid fermentation liquid that 2000ml concentration is 135g/l, be heated to 70 DEG C, through ceramic micro filter membrane filtration, the liquid wax of removing thalline and remnants obtains filtrate.H is added in filtrate2SO4Regulation pH value is to 2.4, and is heated to 95 DEG C, obtains mixing C13H24O4And C14H26O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
The mixed dibasic acid filter cake obtained is mixed and heated to 101 DEG C with isoamyl oxide (isoamyl oxide and binary acid weight ratio are 7:1), until completely dissolved, static 60min, point sub-cloud aqueous phase；In solvent phase, add 80mL deionized water wash organic facies again, again divide aqueous phase；In organic facies, add 1.35g activated carbon insulation decolouring 30min, be then filtered to remove activated carbon.
Organic facies after decolouring adds 200 g/g S-80 sorbitan fatty acid ester and 2000mL deionized waters, at 95 DEG C, under stirring, uses 10wt%K2CO3Aqueous solution regulation pH to 6.7, after stirring mixing 20min, is warming up to 130 DEG C and stands 20min layering, reclaim upper strata solvent.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 3.8, after being heated to 80 DEG C, be incubated 30min, afterwards by C14H22O4Aqueous solution slow cooling is to 40 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Comparative example 1
Take 2000ml and obtained C by Candida tropicalis fermentation12H22O4Fermentation liquid, concentration is the fermentation liquid of 160g/L.Fermentation liquid will be terminated and heat 85 DEG C, and stand about 2h, then divide the liquid wax that upper strata remains, then be cooled to 70 DEG C, be filtered to remove the impurity such as thalline through microfiltration and obtained cleaner liquid.H is added in filtrate2SO4Regulation pH value is to 2.5, and is heated to 90 DEG C, obtains C12H22O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
C12H22O4Filter cake and diisobutyl ether (n-butyl ether and C12H22O4Weight ratio is 7:1) mixing, and it is heated to 90 DEG C, and static 30min, point sub-cloud aqueous phase；In solvent phase, add 300mL deionized water wash organic facies again, again divide aqueous phase；With backward organic facies adds 0.3g activated carbon insulation decolouring 30min, then it is filtered to remove activated carbon.
Organic facies after decolouring adds 3800mL deionized water, under agitation, is 6.3 with 30wt%NaOH regulation pH, after stirring mixing 25min, stands 30min layering, reclaim upper strata solvent.Under agitation, in lower aqueous solution, drip sulphuric acid, regulate pH to about 3.0, after being heated to 95 DEG C, be incubated 30min, afterwards by C12H22O4Aqueous solution slow cooling is to 45 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Comparative example 2
Take 2000ml and obtained C by Candida tropicalis fermentation12H22O4Fermentation liquid, concentration is the fermentation liquid of 160g/L.Fermentation liquid is heated to 85 DEG C, enters micro-filtration, remove thalline and liquid wax etc., obtain the filtrate containing long-chain biatomic acid salt of clarification.H is added in filtrate2SO4Regulation pH value is to 3.0, and is heated to 95 DEG C, obtains C12H22O4Water of crystallization solution, is cooled to room temperature and is filtrated to get filter cake.
By C12H22O4Filter cake and n-butyl ether (n-butyl ether and C12H22O4Weight ratio is 6:1) mixing, and it is heated to 95 DEG C, and static 30min, point sub-cloud aqueous phase；In solvent phase, add 280mL deionized water wash organic facies, again divide aqueous phase；In organic facies, add 0.2g activated carbon insulation decolouring 30min, be then filtered to remove activated carbon.
Adding 4000mL deionized water in organic facies after decolouring, regulating pH with 10wt%NaOH under stirring is 9.0, after stirring mixing 20min, stands 30min layering, recovery upper strata solvent.In aqueous phase, add 0.2g activated carbon insulation decolouring 30min, be then filtered to remove activated carbon, obtain binary acid double sodium salt filtrate.Under agitation, in double sodium salt aqueous solution, drip H2SO4, regulate pH to about 3.5, be heated to 95 DEG C.By C12H22O4Aqueous solution slow cooling is to 15 DEG C, and filtering for crystallizing liquid obtains filter cake, and filter cake is washed with deionized to neutrality, and drying step obtains product.Experimental result table 1.
Table 1 long-chain biatomic acid product quality
Total acid in embodiment 5 is all long-chain biatomic acid sums.

Claims (14)

1. a method for extracting and refining long-chain biatomic acid, including:
I, long-chain biatomic acid is terminated fermentation liquid carry out pretreatment to remove solid thalline and liquid wax；
II, acidifying make long-chain biatomic acid crystallization, it is thus achieved that long-chain biatomic acid water of crystallization solution；
III, by long-chain biatomic acid water of crystallization solution filter, the long-chain biatomic acid filter cake obtained or long-chain biatomic acid water of crystallization solution mix with organic solvent makes long-chain biatomic acid dissolve；
After organic phase washed with water after IV, separation, add adsorbent, filtering and removing solid content；
V, in the organic facies that step IV obtains, add emulsifying agent and alkaline solution, system temperature is 75 DEG C ~ 100 DEG C, pH value is 5.8 ~ 7.0, response time is 15 ~ 30min, then the reaction temperature of system is improved to 105 DEG C ~ 135 DEG C, time of repose is 15 ~ 60min, is isolated to the aqueous phase containing long-chain biatomic acid mono-salt；The described alkaline solution solution of one or more in sodium bicarbonate, sodium carbonate, sodium hydroxide, potassium bicarbonate, potassium carbonate, potassium hydroxide, the mass concentration of alkaline solution is 10% ~ 40%, and the alkali number of addition and long-chain biatomic acid butt mol ratio are 0.9 ~ 1.1；Emulsifying agent is nonionic emulsifier, and the consumption of emulsifying agent makes its concentration in system be 30 ~ 500 g/g；
VI, in the aqueous phase of step V gained add mineral acid, the pH value making system is 3.0 ~ 4.5, and the temperature of system is 85 DEG C ~ 100 DEG C, obtains long-chain biatomic acid solution；
VII, the long-chain biatomic acid clear filtrate of step VI gained is cooled to 12 DEG C ~ 25 DEG C, obtains long-chain biatomic acid crystal solution；
VIII, separation long-chain biatomic acid crystal solution, and it is dried to obtain long-chain biatomic acid product.
The most in accordance with the method for claim 1, it is characterised in that in step V, nonionic emulsifier used is OPEO or sorbitan fatty acid ester.
The most in accordance with the method for claim 2, it is characterised in that in step V, OPEO used is octyl phenol polyoxyethylene (4) ether, and sorbitan fatty acid ester is S-40, S-60 and S-80.
The most in accordance with the method for claim 1, it is characterised in that the alkaline solution described in step V is sodium hydroxide.
The most in accordance with the method for claim 1, it is characterised in that in step V, the consumption of emulsifying agent makes its concentration in system be 110 ~ 200 g/g.
The most in accordance with the method for claim 1, it is characterised in that the solution that step VI obtains adds adsorbent and is filtrated to get the filtrate of clarification, or make this solution by filtering and removing impurity, obtain the filtrate of clarification, carry out step VII the most again.
The most in accordance with the method for claim 6, it is characterized in that the adsorbent added in the solution that step VI obtains is one or more in activated carbon, active hargil, addition is the 0.01wt% ~ 2.0wt% of long-chain biatomic acid butt weight, and adsorption time is 30min ~ 60min.
The most in accordance with the method for claim 1, it is characterised in that terminating fermentation liquid described in step I is the metabolite that microorganism utilizes that the fermentation of liquid wax obtains, and the long-chain biatomic acid general molecular formula wherein contained is CnH2n-2O4, wherein n is 10-18, and long-chain biatomic acid is single a kind of long-chain biatomic acid, or is hybrid long chain dicarboxylic acid.
The most in accordance with the method for claim 1, it is characterised in that the acidifying described in step II uses H2SO4、HNO3、HCl、H3PO4In one or more, the pH value of described acidifying is 2.0 ~ 4.0；Mineral acid described in step VI is H2SO4、HNO3、HCl、H3PO4In one or more.
The most in accordance with the method for claim 1, it is characterised in that in step III, using the mode separation long-chain biatomic acid crystal solution of heat filtering, temperature is 40 DEG C ~ 100 DEG C.
11. in accordance with the method for claim 1, it is characterised in that the organic solvent used by step III be propyl ether, butyl ether, diisobutyl ether, amyl ether, isoamyl oxide, hexyl ether one or more.
12. in accordance with the method for claim 1, it is characterised in that the organic solvent used by step III be n-butyl ether, diisobutyl ether, isoamyl oxide one or more.
13. in accordance with the method for claim 1, it is characterised in that the organic solvent used by step III is 2:1 ~ 7:1 with the weight ratio of long-chain biatomic acid butt.
14. in accordance with the method for claim 1, it is characterised in that the adsorbent in step IV is one or more in activated carbon, active hargil, and addition is the 0.01wt% ~ 2.0wt% of long-chain biatomic acid butt weight, and adsorption time is 30min ~ 60min.
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