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Method for preparing cellulose ether by using bast fiber crops, straws and other herbaceous plants as raw materials

A technology of herbal plants and cellulose ethers, applied in the use of microorganisms/enzyme cellulose treatment, non-woody plants/crop pulp, fiber raw material treatment, etc., can solve the problem of low function of degumming strains, imperfect degumming process, and insufficient enzyme activity Advanced problems, to achieve the effect of complete removal of gum, complete enzyme system and high enzyme activity

Active Publication Date: 2019-02-01
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long-term, stable and large-scale application of herbal plant biological degumming technology has not been reported. The main reasons are that the function of the degumming strain is low and the degumming process is not perfect.
The enzyme system secreted by degumming microorganisms is not comprehensive and the enzyme activity is not high enough, so the residual gum content after biological degumming is high, which brings difficulties to subsequent processing

Method used

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  • Method for preparing cellulose ether by using bast fiber crops, straws and other herbaceous plants as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a kind of hemp bast ethyl cellulose ether, its preparation flow chart is as follows figure 1 As shown, the preparation method is as follows:

[0043] (1) Raw hemp grinding and crushing

[0044] Sun-dry the mildew-free cannabis bast until the water content is lower than 10%, fluff and remove impurities. Grind it into a fine loose crumb powder with a length of about 2 mm with a plant pulverizer.

[0045] (2) Bacteria culture

[0046] Plant spoilage bacteria PW (Pectobacterium wasabiae IBFC 2016) and Bacillus subtilis BSE (Bacillus subtilis BSE) were mixed and cultured to prepare a bacterial suspension; culture conditions: broth culture solution, pH 7, temperature 34°C, ventilation 0.2~ 0.3m 3 / (m 3 • h) with stirring at 120 rpm.

[0047] (3) Diluted solution

[0048] Pour tap water into the fermenter with heating, stirring and ventilation functions, and adjust to pH 7, temperature 34°C ± 1°C; add 2% of the bacterial suspension obtained in s...

Embodiment 2

[0058] This embodiment provides a kind of sisal leaf carboxymethyl cellulose ether, the preparation method is as follows:

[0059] (1) Raw hemp grinding and crushing

[0060] Dry the mildew-free sisal leaves until the water content is lower than 10%, fluff them and remove impurities. Grind it into a small loose crumb powder of about 2 mm with a plant pulverizer.

[0061] (2) Bacteria culture

[0062] Plant spoilage bacteria PW and Bacillus subtilis BSE were cultured together to prepare a bacterial suspension. Culture conditions: Broth culture medium, pH7, temperature 35°C, ventilation volume 0.2~0.3m 3 / (m 3 • h) with stirring at 120 rpm.

[0063] (3) Diluted solution

[0064] Pour tap water into the fermenter with heating, stirring and ventilation functions, and adjust to pH 7, temperature 34°C ± 1°C; add 2% of the bacterial suspension obtained in step (2) to it, mix and dilute to obtain the total activity Bacterial content of at least 1×10 7 cfu / mL dilution.

[0065...

Embodiment 3

[0074] This example provides a rice straw hydroxyethyl cellulose film ether, the preparation method is as follows:

[0075] (1) Raw hemp grinding and crushing

[0076] Dry the mildew-free rice straw to a moisture content of 8%, fluff it up and remove impurities. Use grinding equipment such as a plant pulverizer to grind it into a fine, loose crumb-like powder of about 2 mm.

[0077] (2) Bacteria culture

[0078] Plant spoilage bacteria PW and Bacillus subtilis BSE were cultured together to prepare a bacterial suspension. Culture conditions: Broth culture medium, pH7, temperature 33°C, ventilation volume 0.2~0.3m 3 / (m 3 • h) with stirring at 130 rpm.

[0079] (3) Diluted solution

[0080] Pour tap water into the fermenter with heating, stirring and ventilation functions, and adjust to pH 7, temperature 34°C ± 1°C; add 2% of the bacterial suspension obtained in step (2) to it, mix and dilute to obtain the total activity Bacterial content of at least 1×10 7 cfu / mL diluti...

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Abstract

The invention provides a method for preparing cellulose ether by using bast fiber crops, straws and other herbaceous plants as raw materials. Wherein the degumming method for the bast fiber crops, thestraws and other herbaceous plants comprises the following steps: the fermentation degumming of the bast fiber crop raw materials is carried out by using a composite strain, and the composite straincomprises plant spoilage bacteria with a preservation number of CGMCC14601 and bacillus subtilis with a preservation number of CCTCC M2018483. The method adopts a mixed culture of plant spoilage bacteria PW and bacillus subtilis BSE to together catalyze the degradation of non-cellulose of the bast fiber crops, the straws and other herbaceous plants. The preparation method has the advantages of high enzyme activity, fast reproduction, complete enzyme system, simple process, low labor intensity, uniform degumming, thorough removal of colloid and the like.

Description

technical field [0001] The present invention relates to the technical field of natural fibers such as hemp and straw, and more specifically relates to a method for preparing cellulose ether by using herbaceous plants such as hemp and straw as raw materials. Background technique [0002] Cellulose is the most abundant biopolymer in the world and one of the most valuable natural renewable resources for human beings. Ramie, kenaf, jute, hemp, green hemp, flax, apocynum and other hemp bast parts, hemp leaves such as abaca and sisal, and straws such as wheat and rice contain 40% to 70% of cellulose and 20% to 50% colloid is an important fiber raw material. Colloids mainly include pectin, hemicellulose, lignin, etc. These substances are embedded between cells and in the cell wall. Through the degumming process, the cellulose in the non-cellulose extracted hemp bast can be removed. [0003] China is the world's largest producer and consumer of cellulose ether, with an average an...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21H11/12C08B11/04C08B11/12C08B11/08
CPCC08B11/04C08B11/08C08B11/12D21C5/005D21H11/12
Inventor 段盛文彭源德成莉凤冯湘沅杨琦刘志远郑科
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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