Method for preparing cotton stalk skin fiber through steam explosion and laccase combined treatment

A cotton stalk husk and flash explosion technology, which is applied in the fields of bast fiber production by chemical method, mechanical treatment, fiber treatment, etc., can solve the problems of easily damaged fibers, environmental pollution, etc., and achieve the effect of convenient processing

Inactive Publication Date: 2014-09-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the preparation of cotton stalk husk fibers by the traditional alkali treatment method, the present invention solves the problems that the existing cotton stalk husk fiber preparation methods are easy to damage the fibers and cause environmental pollution, because the steam flash explosion mainly removes pectin, hemicellulose and other impurities, the lignin content is still high, so the lignin enzyme laccase is used to selectively degrade lignin without damaging cellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) mechanical cutting: the cotton stalk bark is cut into 8cm fragments;

[0030] (2) Soaking: soaking the cotton stalk bark obtained in step (1) in tap water with a bath ratio of 1:20 for 24 hours;

[0031] (3) Steam flash explosion: put the soaked cotton stalk skin into the flash explosion tank, feed saturated water vapor, make the saturated water vapor pressure reach 0.8MPa, maintain the saturated water vapor pressure for 300s, and then flash instantly with 0.0875s;

[0032] (4) Washing with hot water: wash the cotton stalk sheath fiber after the flash explosion in 90°C hot water for 1 hour at room temperature, the bath ratio is 1:40, and filter with a 20-mesh sieve with an aperture;

[0033] (5) Laccase treatment: treat the flash-exploded fibers with laccase solution produced by white-rot fungus, the liquor ratio is 1:40, the temperature is 60°C, the pH value is 4.0, the concentration of the enzyme solution is 200U / mL, and the treatment time is 20h;

[0034] (6) H...

Embodiment 2

[0040] (1) mechanical cutting: the cotton stalk bark is cut into 10cm fragments;

[0041] (2) Soaking: soaking the cotton stalk bark obtained in step (1) in tap water with a bath ratio of 1:15 for 18 hours;

[0042] (3) Steam flash explosion: put the soaked cotton stalk skin into the flash explosion tank, feed saturated water vapor, make the saturated water vapor pressure reach 1.7MPa, maintain the saturated water vapor pressure for 180s, and then flash instantly with 0.0875s;

[0043] (4) Washing with hot water: wash the cotton stalk sheath fiber after the flash explosion in 85°C hot water for 1.5h at room temperature, the bath ratio is 1:30, and filter with a 20-mesh sieve with an aperture;

[0044](5) Laccase treatment: use laccase produced by white-rot fungi to treat the fiber after flash explosion with a bath ratio of 1:30, a temperature of 55°C, a pH value of 3.5, an enzyme solution concentration of 100 U / mL, and a treatment time of 15 hours;

[0045] (6) High temperatu...

Embodiment 3

[0051] (1) mechanical cutting: the cotton stalk bark is cut into 12cm segments;

[0052] (2) Soaking: soaking the cotton stalk bark obtained in step (1) in tap water with a liquor ratio of 1:10 for 12 hours;

[0053] (3) Steam flash explosion: put the soaked cotton stalk skin into the flash explosion tank, feed saturated water vapor, make the saturated water vapor pressure reach 2.0MPa, maintain the saturated water vapor pressure for 120s, and then flash instantly with 0.0875s;

[0054] (4) Hot water washing: wash the cotton stalk sheath fiber after the flash explosion in 80°C hot water for 2 hours at room temperature, the bath ratio is 1:20, and filter through a 20-mesh screen with an aperture;

[0055] (5) Laccase treatment: use crude laccase produced by white-rot fungus to treat the fiber after flash explosion with a bath ratio of 1:20, a temperature of 50°C, a pH value of 4.5, an enzyme concentration of 50 U / mL, and a treatment time of for 10h;

[0056] (6) High temperat...

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Abstract

The invention relates to a method for preparing a cotton stalk skin fiber through steam explosion and laccase combined treatment. The method comprises the steps of firstly adopting the steam explosion method for separating cotton stalk skin, then using laccase generated by white-rot fungi for treating the fiber obtained after explosion, and finally using amino silicon oil for softening the cotton stalk skin fiber. The technological process comprises the steps of mechanical cotton stalk skin cutting, soaking, steam explosion, hot water cleaning, laccase treatment, high temperature inactivation, washing, lubricating treatment, washing, airing, combing and cotton stalk skin fiber obtaining. The explosion time of a steam explosion test stand is quite short and is 0.0875 s, and the acting force on fiber separation during the explosion moment is large. Due to the fact that the steam explosion is mainly used for removing hemicellulose and pectin, the lignin content is still high, the laccase generated by the white-rot fungi is selected for further degrading lignin in the cotton stalk skin fiber, and the method for preparing the cotton stalk skin fiber through steam explosion and laccase combined treatment has the advantages of being mild in action condition, high in specificity, free of environment pollution and the like compared with a traditional alkali treatment method.

Description

technical field [0001] The invention relates to a method for preparing cotton stalk skin fibers through combined treatment with steam flash explosion and laccase, belonging to the field of textile fiber preparation. Background technique [0002] my country is a big cotton producing country, and the cotton straw resources are very rich. Cotton straw is a by-product of cotton planting, and its surface bast contains excellent bast cellulose fibers and non-cellulose substances such as lignin, hemicellulose, and pectin. Cotton stalk bark is a renewable resource, and its cellulose content is about 40%. Extracting cotton stalk bark fibers suitable for textile and composite materials from cotton stalk bark will help increase the value of cotton crops. At present, cotton stalks are mainly used in pulp and papermaking, building materials, fermented feed, etc., with low utilization rate, and most of the cotton stalks are burned as waste, resulting in a great waste of biological resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01B1/10D01C1/02
Inventor 侯秀良廖祥儒张莉董震孙芳芳葛亮
Owner JIANGNAN UNIV
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