Low-alkali degumming process for hemp plants at room temperature

A room temperature, process technology, applied in the field of textile primary processing, can solve the problems of large investment in biological degumming equipment, large amount of chemical agents used, high chroma of degumming wastewater, etc., and achieve the effect of large equipment investment, poor safety and high maintenance costs

Inactive Publication Date: 2010-07-14
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 3) Large amount of wastewater: about 300 tons of wastewater discharged in chemical degumming per ton of raw hemp processed:
[0017] 4) Serious pollution: In addition to a large amount of hemicellulose, pectin, lignin and fatty wax, the degumming wastewater also contains a large amount of chemicals added in the degumming process. Treated with conventional physicochemical and biochemical treatment methods
Coupled with the large investment and high cost of biological degumming equipment, and the need for biological hazard research, biological degumming is currently only used as an auxiliary process for chemical degumming to reduce the pollution of degumming wastewater, and it cannot completely replace chemical degumming in the near future. status
[0024] Since the degumming of hemp plants basically follows the chemical degumming process of ramie or the combined bio-chemical degumming process, there are also problems similar to ramie degumming such as high energy consumption, large investment in equipment, large amount of chemical agents used, and large amount of waste water. , serious pollution and other issues

Method used

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  • Low-alkali degumming process for hemp plants at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The production process of low-alkali degumming of ramie in summer at room temperature:

[0054] 1. Raw hemp pretreatment:

[0055] 1) Binding: tie the ramie into a 500-650g handle as needed;

[0056] 2) Cage: place the ramie neatly and flatly on the hemp cage;

[0057] 2. Soda soaking at room temperature

[0058] Soak the raw hemp in the leaching lye solution composed of NaOH 5g / L, common ramie degumming aid 8g / L, hydrogen peroxide 5g / L and water, the leaching alkali bath ratio is 1:30, the leaching alkali temperature is 50 ℃, soaking The time is 24h.

[0059] 3. Knock hemp: Knock hemp 6-7 circles per bunch of hemp on the disc knocking machine;

[0060] 4. Dehydration: time 3min;

[0061] 5. Oiling:

[0062] Continuous oil supply: temperature 60~80℃, oil bath concentration 3~5g / L, time 1~2min

[0063] Tank type oil supply: temperature 60~80℃, oil bath concentration 2g / L, time 4h

[0064] 6. Dehydration: time 3min;

[0065] 7. Shaking hemp: time 1min

[0066] 8. ...

Embodiment 2

[0070] Low-alkali degumming production process of ramie at room temperature in winter:

[0071] 1. Raw hemp pretreatment:

[0072] 1) Binding: tie the ramie into a 500-650g handle as needed;

[0073] 2) Cage loading: place the ramie fluffy on the hemp cage;

[0074] 2. Soda soaking at room temperature

[0075] 1) Preparation of leaching lye solution: in the soaking tank, prepare leaching lye solution with NaOH 10g / L, common ramie degumming aid 12g / L, hydrogen peroxide 5g / L and water;

[0076] 2) Soaking at room temperature: Immerse the ramie in the pre-prepared soaking lye solution according to the bath ratio of 1:30; soaking time: 120h; soaking temperature 5 ℃.

[0077] 3. Knock hemp: Knock hemp 6-7 circles per bunch of hemp on the disc knocking machine;

[0078] 4. Dehydration: time 3min;

[0079] 5. Oiling:

[0080] Continuous oil supply: temperature 60~80℃, oil bath concentration 3~5g / L, time 1~2min

[0081] Tank type oil supply: temperature 60~80℃, oil bath concent...

Embodiment 3

[0087] The production process of cannabis room temperature low alkali degumming:

[0088] 1. Raw hemp pretreatment:

[0089] 1) Binding: tie the hemp into a 500-650g handle as needed;

[0090] 2) Cage: place the cannabis neatly on the hemp cage;

[0091] 2. Soda soaking at room temperature

[0092] 1) Preparation of leaching lye solution: in the soaking tank, prepare leaching lye solution with NaOH 5g / L, common ramie degumming aid 5g / L, hydrogen peroxide 3g / L and water;

[0093] 2) Soda soaking at room temperature: Hang the hemp into the pre-prepared soaking lye solution according to the bath ratio of 1:20; soaking time: 48h;

[0094] 3. Knock hemp: Knock hemp 6-7 circles per bunch of hemp on the disc knocking machine;

[0095] 4. Dehydration: time 3min

[0096] 5. Oiling:

[0097] Continuous oil supply: temperature 60~80℃, oil bath concentration 3~5g / L, time 1~2min

[0098] Tank type oil supply: temperature 60~80℃, oil bath concentration 2g / L, time 4h

[0099] 6. Dehy...

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Abstract

The invention relates to a low-alkali degumming process for hemp plants at room temperature, and belongs to the field of primary textile processing. The process is characterized by changing a ramie degumming process into a low-alkali soaking process at room temperature and comprising the following steps of performing pretreatment on raw ramie, soaking the raw ramie into alkali at room temperature, stamping the ramie, dehydrating, feeding oil, dehydrating, drying and degumming to obtain degummed ramie. The degumming process has the advantages of simpleness due to primary low-alkali soaking at room temperature, small and safe equipment investment, low energy consumption, low pollution due to low using amount of chemical agent, simple waste water treatment due to low chromaticity of degumming waste water and degumming uniformity and good whiteness of the obtained degummed ramie.

Description

technical field [0001] The invention relates to a degumming production process for various hemp plants, and belongs to the field of primary textile processing. Background technique [0002] Hemp plants generally refer to plants that can extract spinnable fibers, mainly including ramie, flax, hemp, jute, sisal, apocynum, pineapple, hibiscus, white hemp, etc., as well as plants that can extract fibers such as paper mulberry . The epidermis is composed of cellulose, hemicellulose, lignin and pectin, but the proportions are different. In addition to cellulose, other substances known as gums, these amorphous crusts bind the fibers together and make them stiff. To spin the cellulose in the raw hemp, the gum must be removed without damaging the fibers as much as possible, so that the bonded fibers can be separated and turned into fluffy spinnable fibers. This process is called degumming. . [0003] The degumming of hemp plants basically follows the chemical degumming process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 王成国张尚勇
Owner WUHAN TEXTILE UNIV
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