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Method for preparing keratin by dissolving wool with deep-eutectic solvent

A low eutectic solvent and keratin technology, applied in the field of keratin preparation, can solve the problems of difficult recycling of waste liquid, environmental pollution, long time and the like, and achieve the effects of low price, high dissolution rate and short preparation period

Active Publication Date: 2018-08-31
NANTONG TEXTILE & SILK IND TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Conventional wool dissolution methods include oxidation-reduction method, alkali treatment method, cuproammonia solution method, metal salt method, etc. These dissolution methods require the addition of a large amount of chemical reagents, such as oxidants, reducing agents, alkalis, cuproammonia solutions, metal salts, etc. Salt, etc. After treatment, the waste liquid is not easy to be recycled and reused, and direct discharge will cause environmental pollution and other problems
Chinese patent 200410011389.6 discloses "a preparation method of keratin solution". This invention uses imidazolium chloride salt series ionic liquid with strong hydrogen bond breaking ability to dissolve wool to prepare keratin. This method needs to be dissolved at 100-150°C 2-10h, the temperature required for dissolution is high and the time is long, and imidazole ionic liquids have been proved to be not completely green and environmentally friendly chemical reagents, and have certain toxicity

Method used

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  • Method for preparing keratin by dissolving wool with deep-eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh choline chloride and oxalic acid, choline chloride and formic acid, choline chloride and citric acid in a molar ratio of 1:2, respectively, and shake them in a constant temperature water bath at 65°C to dissolve them until no A color-transparent solution was generated, and three deep eutectic solvents were prepared. 1% by mass (based on the mass of the deep eutectic solvent) of wool was added to each of the three prepared deep eutectic solvents, and shaken and dissolved in a constant temperature water bath at 95° C. for 2 h. After the dissolution process, the three deep eutectic solvents all produced a yellow-brown suspension, and the deep eutectic solvent combined with choline chloride and oxalic acid dissolved the wool to obtain the darkest suspension, which was yellow-brown.

Embodiment 2

[0033] Weigh a certain mass of choline chloride, oxalic acid, and water according to the molar ratio of 1:2:3, and shake it in a constant temperature water bath at 85°C to dissolve it. After 20 minutes, the solution becomes colorless and transparent, which is eutectic solvent. Add 1% by mass ratio (based on the mass of the deep eutectic solvent) of wool to the prepared deep eutectic solvent, shake and dissolve in a constant temperature water bath at 95° C. for 2 h. After the product obtained was cooled, it was packed into a dialysis bag with a theoretical molecular weight cut-off of 3000 Daltons, dialyzed for 48 hours, filtered, and settled to 25mL, and the absorbance of the solution after the constant volume was tested at 274nm on a UV-visible spectrophotometer. The value is 0.2145. The filter residue was dried to a constant weight and weighed, and the dried filter residue and the mass of wool before dissolution were accurately weighed, and the wool dissolution rate was calc...

Embodiment 3

[0035] Weigh a certain mass of choline chloride and oxalic acid according to the molar ratio of 2:1, and shake it in a constant temperature water bath at 70°C to dissolve it. After 20 minutes, the solution becomes colorless and transparent, which is the deep eutectic solvent. Add 1% by mass ratio (based on the weight of the deep eutectic solvent) of wool to the prepared deep eutectic solvent, shake and dissolve in a constant temperature water bath at 95° C. for 2 hours. After the product obtained was cooled, it was packed into a dialysis bag with a theoretical molecular weight cut-off of 3000 Daltons, dialyzed for 48 hours, filtered, and settled to 100 mL. The absorbance of the solution at 274 nm was measured on a UV-visible spectrophotometer. The value is 0.0667, the filter residue is dried to a constant weight and weighed, and the wool mass before and after dissolution is accurately weighed, and the wool dissolution rate is calculated to be 17.24%.

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Abstract

The invention relates to a method for preparing keratin by dissolving wool with a deep-eutectic solvent, the method comprises the steps of adding the wool to a choline eutectic solvent, dissolving at80 to 130 DEG C for 0.5 to 3 hours, and performing dialysis and filtration to obtain keratin contained in filtrate, wherein the choline eutectic solvent comprises a choline salt and an organic acid, and the molar ratio of the choline salt to the organic acid is 1:1-2. The deep eutectic solvent used in the method is a green additive, conforms to the concept of green environmentally-friendly chemistry, and the method has a short time for dissolving the wool and a high dissolution rate of the wool.

Description

technical field [0001] The invention relates to the technical field of keratin preparation, in particular to a method for preparing keratin by using a deep eutectic solvent to dissolve wool. Background technique [0002] Deep eutectic solvent refers to a two-component combination of hydrogen bond donors (such as quaternary ammonium salts) and hydrogen bond acceptors (such as amides, polycarboxylic acids, and polyols) in a certain stoichiometric ratio. Or three-component eutectic mixture, which was first proposed by Abbott et al. in 2003. A notable feature of deep eutectic solvents is that their melting points are relatively low, and their melting points are significantly lower than those of the pure substances of their components. In addition, deep eutectic solvents also have the characteristics of low glass transition temperature, low vapor pressure, low price, simple synthesis process, easy operation of synthesis method, easy recycling, non-toxic and harmless, and biodegr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K14/47C07K1/14C07K1/34
CPCC07K14/4741
Inventor 王冬悦唐人成杨旭红
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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