CN103074386B - Method for recycling aliphatic polyester in ionic liquid through enzyme catalysis and performing repolymerization - Google Patents
Method for recycling aliphatic polyester in ionic liquid through enzyme catalysis and performing repolymerization Download PDFInfo
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- CN103074386B CN103074386B CN201210581117.4A CN201210581117A CN103074386B CN 103074386 B CN103074386 B CN 103074386B CN 201210581117 A CN201210581117 A CN 201210581117A CN 103074386 B CN103074386 B CN 103074386B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention discloses a method for recycling aliphatic polyester in ionic liquid through enzyme catalysis and performing repolymerization. The recycling method comprises the following steps: adding aliphatic polyester powder, ionic liquid and distilled water into a conical bottle and performing ultrasonic treatment; adding lipase and reacting at constant temperature for 4 to 48 hours; filtering, recycling the enzyme, adding trichloromethane, toluene, tetrahydrofuran, ethanol, acetone or water into the filtrate, extracting the degradation product, standing, layering and separating liquid to obtain the degradation product solution and recycling the ionic liquid; and distilling the degradation product under reduced pressure to obtain light yellow liquid, namely the degradation product. According to the method, environment-friendly and recyclable ionic liquid and enzyme serve as the solvent and the catalyst, so the aliphatic polyester is subjected to enzymolysis quickly and effectively. The degradation product is repolymerized by the same solvent and the catalyst, the reaction condition is mild, the relative molecular mass of the repolymerization product is high, the molecular weight is distributed narrowly, and the ionic liquid and the enzyme can be recycled, so environmental friendliness is realized.
Description
Technical field
The invention belongs to the chemical recovery of aliphatic polyester and the technical field of recycling, particularly a kind of immobilized enzyme catalysis that utilizes in ionic liquid reclaims aliphatic polyester and the method for repolymerization.
Technical background
Aliphatic polyester is the macromolecular compound that a class main chain is formed by connecting by the ester bond of facile hydrolysis by aliphatic structure unit, the microorganism easily existed by nature because of it or the bio-enzyme degradation of their metabolism and there is good biological degradability and biocompatibility, since appearance, be just subject to the extensive concern of Chinese scholars.
Having wide range of applications of aliphatic polyester, not only can be used as polymer plastic agent, also for many fields such as bio-medical material, wrapping material, agripast, disposable tablewares.Can microbiological deterioration be carried out after this type of materials'use, finally become carbonic acid gas and water.
In short supply along with Global Oil resource, the recycle of petrochemicals is imperative.If the aliphatic polyester after using directly is degraded to carbonic acid gas and water, although be beneficial to environment protection, be unfavorable for that the saving of petroleum resources utilizes.But, utilize the feature that aliphatic polyester can be degraded by microorganisms, its method by chemical recovery and recycling is circulated, avoids it to go back to nature fast, then significant in the recycle of resource.
At present, have been reported and point out, can utilize biological enzyme that aliphatic polyester is degraded to oligopolymer or monomer in organic solvent, thus realize chemical recovery, and utilize oligopolymer to carry out repolymerization, again obtain the aliphatic polyester of high molecular, thus realize recycle.The organic solvent that the toxicity such as this class methods many employings toluene, acetonitrile, tetrahydrofuran (THF) are larger, consumption is large, and is unfavorable for environmental protection.Therefore, introduce the drawback that novel method improves existing recovery method, and develop effective repolymerization method, the cycling and reutilization realizing aliphatic polyester is significant.
Summary of the invention
The present invention proposes one enzyme catalysis in ionic liquid and reclaim aliphatic polyester and repolymerization method thereof; The method adopts environmental protection respectively, can repeat the ionic liquid recycled and enzyme as solvent and catalyzer, aliphatic polyester is carried out enzyme digestion reaction, and adopts identical solvent and catalyzer to carry out repolymerization to degraded product, mild condition, can be recycled, environmental protection.
For achieving the above object, the present invention adopts following technical scheme:
In ionic liquid, a method for aliphatic polyester is reclaimed in enzyme catalysis, comprises the steps:
A) aliphatic polyester to be recycled is ground into powder, and drying treatment;
B) aliphatic polyester powder, ionic liquid, distilled water are added Erlenmeyer flask, at 20 ~ 100 DEG C, carry out supersound process 5 ~ 45min;
C) lipase is added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 40 ~ 100 DEG C, reaction 4 ~ 48h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds trichloromethane, toluene, tetrahydrofuran (THF), ethanol, acetone or water extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
E) degraded product solution carries out underpressure distillation at 30 ~ 120 DEG C, obtains weak yellow liquid and is degraded product;
Wherein, the ratio of the mass fraction of aliphatic polyester powder, ionic liquid, distilled water and lipase is 1:(1 ~ 100): (0.01 ~ 10): (0.01 ~ 5).
The present invention further improves and is: aliphatic polyester described in step a) is formed with dibasic alcohol polycondensation by a kind of in diprotic acid, diester or dibasic acid anhydride, or is formed by two or more different structure diprotic acid, diester or dibasic acid anhydride and two or more different structure diol copolymer.
The present invention further improves and is: the ratio of the mass fraction of aliphatic polyester powder, ionic liquid, distilled water and lipase is 1:(30 ~ 85): (0.5 ~ 10): (0.5 ~ 5).
The present invention further improves and is: drying treatment described in step a) is vacuum-drying 24h at 25 DEG C.
The present invention further improves and is: the anionic group of ionic liquid described in step b) is Br
-, HSO
4 -, BF
4 -, PF
6 -, (CF
3sO
2)
2n
-, NO
3 -middle one, cation group is [BPy], [HNEt
3], [BMim], a kind of in [MMim].
The present invention further improves and is: lipase described in step c) is immobilized antarctic candidia lipase, immobilized porcine pancreatic lipase or immobilized pseudomonas cepacia lipase.
In ionic liquid, a method for enzyme catalysis repolymerization degraded product, comprises the steps:
A) degraded product, ionic liquid, lipase, distilled water are added reactor, stir, at 40 ~ 100 DEG C, carry out synthesis under normal pressure, being decompressed to vacuum tightness after reaction 3 ~ 12h is-400 ~-750mmHg, continues reaction 1 ~ 30h, terminates reaction;
B) by gained mixture filtration after step a) reaction, recovery enzyme, adds trichloromethane or tetrahydrofuran (THF) dissolves or extraction, and reclaim ionic liquid, reaction mixture adds methyl alcohol, ethanol or water precipitation, suction filtration, and the drying of filter cake washing final vacuum, obtains repolymerization product;
Wherein, the mass ratio of degraded product, ionic liquid, lipase, distilled water is 1:0.5 ~ 20:0.01 ~ 5:0.01 ~ 5.
The present invention further improves and is: degraded product described in step a) is a kind of degraded product with the polyester of dibasic alcohol polycondensation in diprotic acid, diester or dibasic acid anhydride, or forms the degraded product of polyester for two or more different structure diprotic acid, diester or dibasic acid anhydride and two or more different structure diol copolymer.
The present invention further improves and is: the anionic group of ionic liquid described in step a) is Br
-, HSO
4 -, BF
4 -, PF
6 -, (CF
3sO
2)
2n
-, NO
3 -middle one, cation group is [BPy], [HNEt
3], [BMim], a kind of in [MMim].
The present invention further improves and is: lipase described in step a) is immobilized antarctic candidia lipase, immobilized porcine pancreatic lipase, immobilized pseudomonas cepacia lipase or immobilized at.
The present invention further improves and is: the mass ratio of degraded product, ionic liquid, lipase, distilled water is 1:5 ~ 18:0.3 ~ 1:0.1 ~ 0.5.
The present invention further improves and is: in step a), decompression is-400 ~-750mmHg for being decompressed to vacuum tightness gradually through 1 ~ 2h.
Adopt recovery of the present invention and reuse method, have the following advantages:
1) adopt ionic liquid as solvent, not only can substitute the larger organic solvent of toxicity, go back recoverable, and effectively protect
Hold enzymic activity, improve catalytic efficiency;
2) utilize enzymatic specificity, degraded product structure can be controlled, make degraded product component less, be conducive to repolymerization;
3) adopt the direct repolymerization of degraded product, achieve effective utilization of aliphatic polyester waste.
Embodiment
Below in conjunction with embodiment, synthetic method of the present invention is further described.
Embodiment 1:
Aliphatic polyester and repolymerization method thereof are reclaimed in the enzyme catalysis in ionic liquid of the present invention's one, comprise the following steps:
A) poly butylene succinate is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of poly butylene succinate powder, 50 parts of [BMim] PF
6, 1 part of distilled water add Erlenmeyer flask, at 40 DEG C, carry out supersound process 30min, ultrasonic frequency is 50Hz;
C) in mass ratio 1 part of immobilized porcine pancreatic lipase is added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 90 DEG C, reaction 24h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds chloroform extraction degraded product, stratification, separatory, obtains degraded product solution, and reclaims ionic liquid;
E) degraded product solution carries out underpressure distillation at 40 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 800, and productive rate is 94%.
Embodiment 2:
A) poly adipate succinic acid ester is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of poly adipate succinic acid ester powder, 30 parts of [MMim] PF
6, 0.5 part of distilled water add Erlenmeyer flask, at 60 DEG C, carry out supersound process 10min, ultrasonic frequency is 100Hz;
C) in mass ratio 0.5 part of immobilized porcine pancreatic lipase is added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 70 DEG C, reaction 18h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds tetrahydrofuran (THF) extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
E) degraded product solution carries out underpressure distillation at 30 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 1000, and productive rate is 95%.
Embodiment 3:
A) poly-hexanodioic acid-co-succinic acid-butanediol ester is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of poly-hexanodioic acid-co-succinic acid-butanediol ester powder, 1 part of [BMim] PF
6, 0.01 part of distilled water add Erlenmeyer flask, at 20 DEG C, carry out supersound process 20min, ultrasonic frequency is 80Hz;
C) in mass ratio 0.01 part of immobilized porcine pancreatic lipase is added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 85 DEG C, reaction 48h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds tetrahydrofuran (THF) extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
E) degraded product solution carries out underpressure distillation at 50 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 1000, and productive rate is 95.1%.
Embodiment 4:
A) poly-succinic hexylene glycol-co-butanediol ester is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of poly-succinic hexylene glycol-co-butanediol ester powder, 60 parts of [HNEt
3] PF
6, 3 parts of distilled water add Erlenmeyer flask, at 80 DEG C, carry out supersound process 5min, ultrasonic frequency is 75Hz;
C) in mass ratio 3 parts of immobilized candida antarctica lipases are added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 65 DEG C, reaction 36h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds toluene extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
E) degraded product solution carries out underpressure distillation at 120 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 1000, and productive rate is 93.7%.
Embodiment 5:
A) polybutyleneadipate-co-binaryglycol ester is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of hexanodioic acid butyleneglycol-co-binaryglycol ester powder, 75 parts of [MMim] BF
4, 5 parts of distilled water add Erlenmeyer flask, at 40 DEG C, carry out supersound process 15min, ultrasonic frequency is 100Hz;
C) in mass ratio 2 parts of immobilization pseudomonas cepacia lipase are added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 40 DEG C, reaction 30h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds water extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
E) degraded product solution carries out underpressure distillation at 90 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 1200, and productive rate is 92.6%.
Embodiment 6:
A) poly-succinic acid-butanediol-co-cyclohexanedimethanoester ester is ground into powder, and at 25 DEG C vacuum-drying 24h;
B) in mass ratio by 1 part of poly-succinic acid-butanediol-co-cyclohexanedimethanoester ester powder, 85 parts of [MMim] PF
6, 10 parts of distilled water add Erlenmeyer flask, at 100 DEG C, carry out supersound process 45min, ultrasonic frequency is 100Hz;
C) in mass ratio 5 parts of immobilized candida antarctica lipases are added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 100 DEG C, reaction 4h, terminate reaction;
D) filter, reclaim enzyme, filtrate adds chloroform extraction degraded product, stratification, separatory, obtains degraded product solution, and reclaims ionic liquid;
E) degraded product solution carries out underpressure distillation at 60 DEG C, obtains weak yellow liquid and is degraded product.
The effect of the present embodiment is: degradation rate can reach 100%, and the equal relative molecular mass of degraded product number is less than 1260, and productive rate is 93.2%.
Embodiment 7 ~ 12:
A) in mass ratio by 1 part of embodiment 1 ~ 6 degraded product, 10 parts of [MMim] PF
6, 0.3 part of immobilized porcine pancreatic lipase, 0.1 part of distilled water add reactor, stir, at 80 DEG C, carry out synthesis under normal pressure, after reaction 6h, be decompressed to vacuum tightness gradually for-690mmHg through 1h, continue reaction 18h, terminate reaction;
B) filtered by reaction mixture, reclaim enzyme, add chloroform extraction, reclaim ionic liquid, reaction mixture adds methanol extraction, suction filtration, and filter cake methanol wash 3 times, vacuum-drying, obtains repolymerization product.
The effect of the present embodiment is: the productive rate of synthetic product succinic acid-butanediol ester, poly adipate succinic acid ester, poly-hexanodioic acid-co-succinic acid-butanediol ester, poly-succinic hexylene glycol-co-butanediol ester, polybutyleneadipate-co-binaryglycol ester, poly-succinic acid-butanediol-co-cyclohexanedimethanoester ester is respectively 80%, 86%, 79%, 78%, 75%, 77%, the equal relative molecular mass of number is respectively 50,000,3.6 ten thousand, 4.2 ten thousand, 2.6 ten thousand, 2.9 ten thousand, 4.9 ten thousand, and molecular weight dispersion coefficient is respectively 1.38,1.40,1.42,1.43,1.39,1.44.Under this condition, synthetic product relative molecular mass is higher, narrow molecular weight distribution, and productive rate is higher, lipase used and ionic liquid all energy recyclings in reaction, environmental protection.
Embodiment 13 ~ 18:
A) in mass ratio by 1 part of embodiment 1 ~ 6 degraded product, 18 parts of [HNEt
3] BF
4, 0.5 part of immobilization at, 0.5 part of distilled water add reactor, stir, at 90 DEG C, carry out synthesis under normal pressure, after reaction 3h, be decompressed to vacuum tightness gradually for-750mmHg through 2h, continue reaction 24h, terminate reaction;
B) filtered by reaction mixture, reclaim enzyme, add trichloromethane and dissolve, reclaim ionic liquid, reaction mixture adds alcohol settling, suction filtration, and filter cake washing with alcohol 3 times, vacuum-drying, obtains repolymerization product.
The effect of the present embodiment is: the productive rate of synthetic product succinic acid-butanediol ester, poly adipate succinic acid ester, poly-hexanodioic acid-co-succinic acid-butanediol ester, poly-succinic hexylene glycol-co-butanediol ester, polybutyleneadipate-co-binaryglycol ester, poly-succinic acid-butanediol-co-cyclohexanedimethanoester ester is respectively 72%, 79%, 80%, 81%, 86%, 71%, the equal relative molecular mass of number is respectively 3.5 ten thousand, 2.8 ten thousand, 3.0 ten thousand, 2.8 ten thousand, 4.1 ten thousand, 3.3 ten thousand, and molecular weight dispersion coefficient is respectively 1.36,1.37,1.41,1.40,1.37,1.43.Under this condition, synthetic product relative molecular mass is higher, narrow molecular weight distribution, and productive rate is higher, lipase used and ionic liquid all energy recyclings in reaction, environmental protection.
Embodiment 19 ~ 24:
A) in mass ratio by 1 part of embodiment 1 ~ 6 degraded product, 5 parts of [BMim] BF
4, 1 part of immobilized candida antarctica lipase, 0.1 part of distilled water add reactor, stir, at 95 DEG C, carry out synthesis under normal pressure, after reaction 8h, be decompressed to vacuum tightness gradually for-750mmHg through 1.5h, continue reaction 6h, terminate reaction;
B) filtered by reaction mixture, reclaim enzyme, add trichloromethane and dissolve, reclaim ionic liquid, reaction mixture adds methanol extraction, suction filtration, and filter cake methanol wash 3 times, vacuum-drying, obtains repolymerization product.
The effect of the present embodiment is: the productive rate of synthetic product succinic acid-butanediol ester, poly adipate succinic acid ester, poly-hexanodioic acid-co-succinic acid-butanediol ester, poly-succinic hexylene glycol-co-butanediol ester, polybutyleneadipate-co-binaryglycol ester, poly-succinic acid-butanediol-co-cyclohexanedimethanoester ester is respectively 85%, 86%, 88%, 83%, 80%, 86%, the equal relative molecular mass of number is respectively 50,000,5.5 ten thousand, 4.8 ten thousand, 4.3 ten thousand, 3.6 ten thousand, 4.1 ten thousand, and molecular weight dispersion coefficient is respectively 1.30,1.33,1.35,1.32,1.37,1.38.Under this condition, synthetic product relative molecular mass is higher, narrow molecular weight distribution, and productive rate is higher, lipase used and ionic liquid all energy recyclings in reaction, environmental protection.
Embodiment 25 ~ 30:
A) in mass ratio by 1 part of embodiment 1 ~ 6 degraded product, 0.5 part of [BMim] BF
4, 0.01 part of immobilized candida antarctica lipase, 0.01 part of distilled water add reactor, stir, at 40 DEG C, carry out synthesis under normal pressure, after reaction 12h, be decompressed to vacuum tightness gradually for-400mmHg through 1.5h, continue reaction 30h, terminate reaction;
B) filtered by reaction mixture, reclaim enzyme, add trichloromethane and dissolve, reclaim ionic liquid, reaction mixture adds methanol extraction, suction filtration, and filter cake methanol wash 3 times, vacuum-drying, obtains repolymerization product.
Embodiment 31 ~ 36:
A) in mass ratio by 1 part of embodiment 1 ~ 6 degraded product, 20 parts of [BMim] PF
6, 5 parts of immobilized candida antarctica lipase, 5 parts of distilled water add reactor, stir, at 100 DEG C, carry out synthesis under normal pressure, after reaction 10h, be decompressed to vacuum tightness gradually for-600mmHg through 1.5h, continue reaction 1h, terminate reaction;
B) filtered by reaction mixture, reclaim enzyme, add trichloromethane and dissolve, reclaim ionic liquid, reaction mixture adds methanol extraction, suction filtration, and filter cake methanol wash 3 times, vacuum-drying, obtains repolymerization product.
Claims (1)
1. the method for enzyme catalysis repolymerization degraded product in ionic liquid, is characterized in that, comprise the steps:
A) degraded product, ionic liquid, lipase, distilled water are added reactor, stir, at 40 ~ 100 DEG C, carry out synthesis under normal pressure, being decompressed to vacuum tightness after reaction 3 ~ 12h is-400 ~-750mmHg, continues reaction 1 ~ 30h, terminates reaction;
B) after step a) being reacted, gained mixture filters, and reclaims enzyme, adds trichloromethane or tetrahydrofuran (THF) dissolving or extracts, reclaim ionic liquid, reaction mixture adds methyl alcohol, ethanol or water precipitation, suction filtration, filter cake washing final vacuum is dry, obtains repolymerization product;
Wherein, the mass ratio of degraded product, ionic liquid, lipase, distilled water is 1:0.5 ~ 20:0.01 ~ 5:0.01 ~ 5;
Step a) described in the anionic group of ionic liquid be Br
-, HSO
4 -, BF
4 -, PF
6 -, (CF
3sO
2)
2n
-, NO
3 -middle one, cation group is [BPy], [HNEt
3], [BMim], a kind of in [MMim];
Step a) described in lipase be immobilized antarctic candidia lipase, immobilized porcine pancreatic lipase, immobilized pseudomonas cepacia lipase or immobilized at;
The preparation method of described degraded product comprises the steps:
1) aliphatic polyester to be recycled is ground into powder, and drying treatment;
2) aliphatic polyester powder, ionic liquid, distilled water are added Erlenmeyer flask, at 20 ~ 100 DEG C, carry out supersound process 5 ~ 45min;
3) lipase is added ultrasonic after reaction mixture in, sealing Erlenmeyer flask, put into isothermal reaction equipment, at 40 ~ 100 DEG C, reaction 4 ~ 48h, terminate reaction;
4) filter, reclaim enzyme, filtrate adds trichloromethane, toluene, tetrahydrofuran (THF), ethanol, acetone or water extraction degraded product, stratification, and separatory, obtains degraded product solution, and reclaim ionic liquid;
5) degraded product solution carries out underpressure distillation at 30 ~ 120 DEG C, obtains weak yellow liquid and is degraded product;
Wherein, the ratio of the mass fraction of aliphatic polyester powder, ionic liquid, distilled water and lipase is 1:(1 ~ 100): (0.01 ~ 10): (0.01 ~ 5);
Step 2) described in the anionic group of ionic liquid be Br
-, HSO
4 -, BF
4 -, PF
6 -, (CF
3sO
2)
2n
-, NO
3 -middle one, cation group is [BPy], [HNEt
3], [BMim], a kind of in [MMim];
Step 3) described in lipase be immobilized antarctic candidia lipase, immobilized porcine pancreatic lipase or immobilized pseudomonas cepacia lipase;
Step 1) described in aliphatic polyester formed with dibasic alcohol polycondensation by a kind of in diprotic acid, diester or dibasic acid anhydride, or to be formed by two or more different structure diprotic acid, diester or dibasic acid anhydride and two or more different structure diol copolymer.
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