CN115611996A - Preparation method of regenerated chitin - Google Patents
Preparation method of regenerated chitin Download PDFInfo
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- CN115611996A CN115611996A CN202211273378.XA CN202211273378A CN115611996A CN 115611996 A CN115611996 A CN 115611996A CN 202211273378 A CN202211273378 A CN 202211273378A CN 115611996 A CN115611996 A CN 115611996A
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- chitin
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- 229920002101 Chitin Polymers 0.000 title claims abstract description 107
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 58
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 46
- 150000003839 salts Chemical class 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011592 zinc chloride Substances 0.000 claims abstract description 23
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- IPCXNCATNBAPKW-UHFFFAOYSA-N zinc;hydrate Chemical compound O.[Zn] IPCXNCATNBAPKW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims abstract description 3
- 230000001172 regenerating effect Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 230000008929 regeneration Effects 0.000 claims description 11
- 238000011069 regeneration method Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 230000006196 deacetylation Effects 0.000 claims description 5
- 238000003381 deacetylation reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 29
- 238000004090 dissolution Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- JXTHNDFMNIQAHM-UHFFFAOYSA-N dichloroacetic acid Chemical compound OC(=O)C(Cl)Cl JXTHNDFMNIQAHM-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000008204 material by function Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 description 1
- SNZAEUWCEHDROX-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-one;trihydrate Chemical compound O.O.O.FC(F)(F)C(=O)C(F)(F)F SNZAEUWCEHDROX-UHFFFAOYSA-N 0.000 description 1
- 241000238557 Decapoda Species 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 125000000738 acetamido group Chemical group [H]C([H])([H])C(=O)N([H])[*] 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 1
- 229940106681 chloroacetic acid Drugs 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013058 crude material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229960005215 dichloroacetic acid Drugs 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229960000443 hydrochloric acid Drugs 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229960004838 phosphoric acid Drugs 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229940032330 sulfuric acid Drugs 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- CHSMNMOHKSNOKO-UHFFFAOYSA-L zinc;dichloride;hydrate Chemical compound O.[Cl-].[Cl-].[Zn+2] CHSMNMOHKSNOKO-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
Abstract
The invention relates to a preparation method of regenerated chitin, which comprises the following steps: mixing anhydrous zinc chloride and water, and heating to obtain zinc chloride hydrated molten salt serving as a molten salt solvent, wherein the content of the anhydrous zinc chloride is 65.0-88.0 wt%, and the content of the water is 35.0-12.0 wt%; keeping the molten salt solvent in a molten state by heat preservation, and dispersing chitin powder into the molten salt solvent to obtain a transparent chitin solution, wherein the mass ratio of chitin to the molten salt solvent is (0.1-1.0): 100; regenerating the chitin solution in the regenerated solution to obtain the regenerated chitin. According to the preparation method of the regenerated chitin, the hydrated molten salt chitin solvent is prepared by taking anhydrous zinc chloride and water as raw materials and is used for dissolving the chitin, and the hydrated molten salt solvent system has a good dissolving effect which is mainly shown in high solubility, high transparency of the dissolved chitin solution and good stability.
Description
Technical Field
The invention relates to a natural polymer technology, in particular to a preparation method of regenerated chitin.
Background
Chitin is a renewable marine resource with abundant storage quantity and wide distribution on the earth, and is considered to be one of the biomass materials with the most application prospect due to the advantages of good biocompatibility, low cost, greenness, no pollution and the like. In recent years, biomass functional materials using chitin as a raw material have been attracting attention in the fields of food additives, cosmetic dispersants, drug release agents, reaction chelating agents, and the like. However, chitin is difficult to dissolve in water and most solvent systems due to high polymerization degree, strong hydrophobicity, highly ordered structure and a large amount of intramolecular/intermolecular hydrogen bonding action among polymer chains, so that the conversion and deep processing of chitin materials are severely limited. Therefore, the development of a new chitin solvent system becomes the key to solve the problem of full utilization of chitin materials.
In order to solve the dissolution problem of chitin, a series of solvent systems such as: concentrated inorganic acid and organic acid systems (hydrochloric acid, phosphoric acid, sulfuric acid, methanesulfonic acid, chloroacetic acid and the like) realize the aim of dissolving chitin by protonating oxygen atoms of hydroxyl groups on the chitin and nitrogen atoms of acetylamino groups; a lithium chloride/N, N-dimethylacetamide system, wherein a chelate is formed by chitin and LiCl and then dissolved in N, N-dimethylacetamide; saturated CaCl 2 -2H 2 The chitin can also be dissolved by systems such as O/methanol, trichloroacetic acid, dichloroacetic acid, hexafluoroisopropanol, hexafluoroacetone trihydrate and the like. Although these solvent systems can solve the dissolution problem of chitin, they generally have significant defects of biotoxicity, low dissolution performance, poor stability, non-recyclability and the like, and directly limit the application of chitin regenerated materials in the field of biomass materials. Therefore, it is necessary to develop a new green and safe chitin solvent to solve the problems of the existing solvent system, which is necessary for dissolving chitin and related functional materialsThe material development and utilization have important significance.
Disclosure of Invention
In order to solve the problems of high toxicity, serious environmental pollution and the like of the chitin solvent in the prior art, the invention provides a preparation method of regenerated chitin.
The preparation method of the regenerated chitin comprises the following steps: s1, mixing anhydrous zinc chloride and water, and heating to obtain zinc chloride hydrated molten salt serving as a molten salt solvent, wherein the content of the anhydrous zinc chloride is 65.0-88.0 wt%, and the content of the water is 35.0-12.0 wt%; s2, keeping the molten salt solvent in a molten state by heat preservation, and dispersing chitin powder into the molten salt solvent to obtain a transparent chitin solution, wherein the mass ratio of the chitin to the molten salt solvent is (0.1-1.0): 100; and S3, regenerating the chitin solution in the regenerated solution to obtain regenerated chitin.
Preferably, in the step S1, the temperature is raised to 50.0 ℃ to 120.0 ℃ after the anhydrous zinc chloride and the deionized water are mixed, so as to obtain the colorless and transparent molten salt solvent. It should be understood that the temperature herein should be raised above the melting temperature of anhydrous zinc chloride to obtain a molten salt of zinc chloride hydrate. In a preferred embodiment, the temperature is raised to 50.0 ℃ to 110.0 ℃ after mixing the anhydrous zinc chloride and the deionized water.
Preferably, in the step S2, the molten salt solvent is maintained at a temperature of 50.0 ℃ to 120.0 ℃, chitin is dispersed in the molten salt solvent, and the mixture is stirred to obtain a transparent chitin solution. In a preferred embodiment, the molten salt solvent is maintained at a temperature of 50.0 ℃ to 110.0 ℃.
Preferably, the stirring is carried out at a speed of 1000-1500 rpm.
Preferably, the stirring time is 2.0-8.0h.
Preferably, the preparation method further comprises collecting the chitin regenerated solution and the water washing solution, and heating to recover the chitin solvent.
Preferably, the temperature is raised to 90 ℃ to recover the chitin solvent. In a preferred embodiment, the recovery quality is above 95.0%.
Preferably, in the step S3, the regeneration solution is an ethanol aqueous solution. In a preferred embodiment, the regeneration solution is a 5.0% aqueous ethanol solution.
Preferably, the chitin solution is poured into a mold, then the mold is placed into the regeneration solution for regeneration, and the regenerated chitin is obtained after standing for 2.0-14.0 h.
Preferably, the mold is a glass mold.
Preferably, the washing with deionized water is repeated 3 times after standing.
Preferably, the chitin has a deacetylation degree of less than 10.0% and a viscosity average molecular weight of 0.3 × 10 6 ～2.0×10 6 . It is to be understood that the degree of deacetylation and viscosity average molecular weight are given here by way of example only and not as limitations. In fact, the chitin with small molecular weight can be directly dissolved by water without a solvent system, but this does not mean that the solvent system of the present invention cannot dissolve the chitin with small molecular weight.
According to the preparation method of the regenerated chitin, the hydrated molten salt chitin solvent is prepared by taking the anhydrous zinc chloride and the deionized water as raw materials, and is used for dissolving the chitin, the dissolution effect of the hydrated molten salt solvent system is good, and is mainly represented by high solubility, for example, the maximum solubility can reach 3.0wt%, the chitin solution after dissolution is high in transparency and good in stability, and the chitin solution after dissolution can still keep good fluidity after being stored at room temperature for 3 months. Moreover, the preparation method of the regenerated chitin has the advantages of simple operation, no degradation, strong stability, neutral system, greenness, no pollution, low cost, small influence on the structure of the chitin per se and recyclable solvent. In a word, according to the preparation method of the regenerated chitin, the solvent raw materials have wide sources and low cost, do not contain toxic and harmful substances, are green and environment-friendly, are a new process means which is green, safe and suitable for industrial production, and have important significance for dissolving the chitin and developing and utilizing related functional materials thereof.
Drawings
Fig. 1 is an infrared spectrum of chitin raw material and regenerated chitin according to example 1 of the present invention.
Fig. 2 is a nuclear magnetic resonance spectrum of the chitin raw material and the regenerated chitin according to example 1 of the present invention.
Fig. 3 is a sample diagram of chitin raw material and chitin solution according to example 1 of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The chitin used in the examples is crude material treated by shrimp and crab shell acid, the deacetylation degree is less than 10.0%, and the viscosity average molecular weight is 0.3 × 10 6 ～2.0×10 6 . It is understood that the degree of deacetylation and viscosity average molecular weight are known parameters of chitin per se.
The anhydrous zinc chloride used in the examples was of analytical purity. The anhydrous zinc chloride is used as a solvent raw material, so that the method is wide in source, green and safe, rich in raw materials and low in price.
The water used in the examples was deionized water.
Example 1
Step 1: 10.0g of anhydrous zinc chloride and 4.8g of deionized water were mixed, and the temperature was raised to 50 ℃ to obtain a colorless transparent molten salt solvent.
Step 2: and (2) dispersing 0.08g of chitin into the molten salt solvent obtained in the step (1) by keeping the temperature at 50 ℃, and stirring for 6.0h at the rotating speed of 1000rpm to obtain a transparent chitin solution.
And 3, step 3: pouring the chitin solution obtained in the step 2 into a glass mold, then putting the glass mold into a 5.0% ethanol water solution for regeneration, standing for 8.0h, and then repeatedly washing with deionized water for 3 times to obtain the regenerated chitin.
The dissolution process of the chitin is a physical process and has no change of chemical bonds, so that the structures of the chitin and the regenerated chitin are kept consistent, the dissolution process only destroys the hydrogen bonding effect among molecular chains, and the mobility and the crystallinity of the molecular chains are changed. By the structural representation of the chitin raw material and the regenerated chitin, an infrared spectrogram and a nuclear magnetic resonance spectrogram are shown in figures 1 and 2, and sample graphs of the chitin raw material and the chitin solution are shown in figures 3, and characteristic peaks of functional groups in the graphs can prove that the solvent is an excellent chitin solvent and can be used for dissolving chitin.
Example 2
Step 1: 10.0g of anhydrous zinc chloride and 5.3g of deionized water were mixed, and the temperature was raised to 80.0 ℃ to obtain a colorless and transparent molten salt solvent.
Step 2: and (2) after the temperature of the molten salt solvent obtained in the step (1) is kept at 80.0 ℃, dispersing 0.153g of chitin into the molten salt solvent, and stirring at the rotating speed of 1500rpm for 8.0h to obtain a transparent chitin solution.
And step 3: and (3) pouring the chitin solution obtained in the step (2) into a glass mold, then putting the glass mold into a 5.0% ethanol aqueous solution for regeneration, standing for 8.0h, and then repeatedly washing with deionized water for 3 times to obtain the regenerated chitin.
Example 3
Step 1: 10.0g of anhydrous zinc chloride and 1.4g of deionized water were mixed, and the temperature was raised to 110.0 ℃ to obtain a colorless transparent molten salt solvent.
Step 2: and (2) maintaining the temperature of the molten salt solvent obtained in the step (1) at 110.0 ℃, dispersing 0.0148g of chitin into the molten salt solvent, and stirring for 3.0 hours at the rotating speed of 1000rpm to obtain a transparent chitin solution.
And step 3: pouring the chitin solution obtained in the step 2 into a glass mold, then putting the glass mold into a 5.0% ethanol water solution for regeneration, standing for 8.0h, and then repeatedly washing with deionized water for 3 times to obtain the regenerated chitin.
Example 4
The embodiment provides a determination method for recycling performance of chitin solvent in hydrated molten salt.
Step 1: 10.0g of anhydrous zinc chloride and 4.8g of deionized water were mixed, and the temperature was raised to 50 ℃ to obtain a colorless transparent molten salt solvent.
Step 2: and (2) maintaining the temperature of the molten salt solvent obtained in the step (1) at 50 ℃, dispersing 0.08g of chitin into the molten salt solvent, and stirring at the rotating speed of 1000rpm for 6.0h to obtain a transparent chitin solution.
And step 3: pouring the chitin solution obtained in the step 2 into a glass mold, then putting the glass mold into a 5.0% ethanol water solution for regeneration, standing for 8.0h, and then repeatedly washing with deionized water for 3 times to obtain the regenerated chitin. Collecting chitin regenerated solution and water washing solution, heating to 90 deg.C, and recovering chitin solvent with recovery quality higher than 95.0%.
Comparative example 1
When 10g of anhydrous zinc chloride and 4.8g of water were mixed together, a colorless transparent molten salt solvent could not be obtained at room temperature.
Comparative example 2
Step 1: 10g of anhydrous zinc chloride and 4.8g of water were mixed, and the temperature was raised to 50.0 ℃ to obtain a colorless transparent molten salt solvent.
Step 2: and (2) keeping the temperature of the molten salt solvent obtained in the step (1) at room temperature, dispersing 0.148g of chitin into the molten salt solvent, and stirring at the rotating speed of 1000rpm for 6.0h to obtain a transparent chitin solution.
In conclusion, the invention uses the hydrated molten salt system as the chitin solvent system, has simple dissolving process, mild condition, low raw material price and easy recovery, effectively solves the defects existing in the existing system, reduces the dissolving temperature, obviously improves the stability, improves the recycling efficiency of the molten salt and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications may be made to the above-described embodiment of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (10)
1. A preparation method of regenerated chitin is characterized by comprising the following steps:
s1, mixing anhydrous zinc chloride and water, and heating to obtain zinc chloride hydrated molten salt serving as a molten salt solvent, wherein the content of the anhydrous zinc chloride is 65.0-88.0 wt%, and the content of the water is 35.0-12.0 wt%;
s2, keeping the molten salt solvent in a molten state by heat preservation, and dispersing chitin powder into the molten salt solvent to obtain a transparent chitin solution, wherein the mass ratio of chitin to the molten salt solvent is (0.1-1.0): 100;
and S3, regenerating the chitin solution in the regenerated solution to obtain regenerated chitin.
2. The method according to claim 1, wherein in the step S1, the temperature is raised to 50.0 to 120.0 ℃ after mixing the anhydrous zinc chloride and the deionized water, and a colorless and transparent molten salt solvent is obtained.
3. The method according to claim 1, wherein in step S2, the molten salt solvent is maintained at 50.0 ℃ to 120.0 ℃, chitin is dispersed in the molten salt solvent, and the mixture is stirred to obtain a transparent chitin solution.
4. The method of claim 3, wherein the stirring is performed at a rotation speed of 1000 to 1500 rpm.
5. The process according to claim 3, wherein the stirring time is 2.0 to 8.0 hours.
6. The method of claim 1, further comprising collecting the regenerated solution and the water-washing solution of chitin, and heating to recover the chitin solvent.
7. The production method according to claim 1, wherein in the step S3, the regeneration solution is an aqueous ethanol solution.
8. The method of claim 7, wherein the chitin solution is poured into a mold, the mold is placed into a regeneration solution for regeneration, and the regenerated chitin is obtained after standing for 2.0-14.0 h.
9. The method of claim 8, wherein the mold is a glass mold.
10. The method of claim 1, wherein the deacetylation degree of chitin is less than 10.0%, and the viscosity average molecular weight is 0.3X 10 6 ～2.0×10 6 。
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| CN116284845A (en) * | 2023-03-21 | 2023-06-23 | 中国科学院上海应用物理研究所 | Composite hydrated molten salt chitin solvent and preparation method and application thereof |
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