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A kind of treatment method of lignin in corn stalk viscose fiber pulp cooking liquid

A technology of corn stalks and viscose fiber, which is applied in the field of comprehensive utilization of biomass to prepare viscose fiber, which can solve the problems of environmental pollution, complex components, waste of lignin resources, etc., achieve high recovery efficiency at high temperature, mild reaction conditions, and easy preparation Effect

Active Publication Date: 2018-08-21
吉林中之林农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Using traditional biomass to prepare viscose fiber, the cooking liquid is dark brown and red night, which is a high-concentration organic waste liquid such as lignin degradation products, hemicellulose, etc. Although there is recovery of incineration soda, preparation of organic fertilizers, black liquor cracking, etc. Technology, due to the complexity of the components, it is difficult to recycle and the cost is extremely high, which causes a lot of waste of lignin resources and pollutes the environment. It meets the threshold of environmental pollution and limits the utilization of biomass.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] The corn stalks are directly removed from the corn stalks when the corn is harvested, and the separated corn stalks are cut into sections, crushed, and made into 10mm particles. Co-cultivate for 48 hours, the weight ratio of straw and anaerobic medium is 1:15 to degrade the unstable cellulose and hemicellulose in the rice straw husk, and separate the undegraded corn straw fiber from the fermentation product; squeeze out the liquid, The undegraded corn stalk fiber is transported to lye cooking and high-temperature cooking under anaerobic conditions. The cooking conditions are 20% lower than the traditional technology, that is, NaOH is 15% of absolute dry weight, and Na2S is 4% of absolute dry weight. In a closed environment Lignin-containing slurry is produced by screw extrusion, and the water content of cellulose is less than 20% after screw extrusion; the slurry is filtered through nano-scale ceramic membranes, and the entire concentration process is heated to 320°C und...

specific Embodiment 2

[0022] The corn stalks are directly removed from the corn stalks when the corn is harvested, and the separated corn stalks are cut into sections, crushed, and made into 8 mm particles. Co-cultured for 40 hours, the weight ratio of straw and anaerobic medium was 1:14 to degrade the unstable cellulose and hemicellulose in the rice straw husk, and separate the undegraded corn straw fiber from the fermentation product; The undegraded corn stalk fiber is transported to lye cooking and high-temperature cooking under anaerobic conditions. The cooking conditions are 20% lower than the traditional technology, that is, NaOH is 15% of absolute dry weight, and Na2S is 4% of absolute dry weight. In a closed environment Spiral extruding lignin-containing slurry, after screw extrusion, the moisture content of cellulose is less than 20%; the slurry is filtered through nano-scale ceramic membranes, and the entire concentration process is heated to 300°C under high temperature and anaerobic cond...

specific Embodiment 3

[0023] The corn stalks are directly removed from the corn stalks when the corn is harvested, and the separated corn stalks are cut into sections, crushed, and made into 8 mm particles. Co-cultivate for 36 hours, the weight ratio of straw and anaerobic medium is 1:12 to degrade the unstable cellulose and hemicellulose in the rice straw husk, and separate the undegraded corn straw fiber from the fermentation product; squeeze out the liquid, The undegraded corn stalk fiber is transported to lye steaming and high-temperature cooking under anaerobic conditions. The cooking conditions are less than 20% lower than traditional technology, that is, NaOH is 14% of absolute dry weight, and Na2S is 4% of absolute dry weight. In a closed environment The lower screw extrudes the lignin-containing slurry, and the water content of the cellulose after screw extrusion is less than 20%; the slurry is filtered through a nanoscale ceramic membrane, and the entire concentration process is heated to ...

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PUM

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Abstract

The invention discloses a processing method for lignin in cooking liquor of corn stalk viscose fiber pulp. The processing method includes the following steps: directly removing cores and leaves from corn stalks in a corn harvest, sectioning and smashing the separated corn stalks into 1 - 10 mm particles, degradating instable cellulose and hemicellulose in corn stalk skin by utilizing 12-48 hour co-culture of rumen fungi and symbiotic bacteria under the conditions of stalk removing and culture medium oxygen in anaerobism, separating the corn stalk fiber without degradation and fermentation products; steaming the corn stalk fiber without degradation at high temperature with alkaline solution under anoxic conditions, spirally extruding the slurry containing lignin in a closed environment; filtering and condensing the slurry by ceramic membrane under anaerobic and high-temperature conditions, adding anaerobic fermentation products to the filter fluid for neutralization reaction after alkali extraction, and performing sewage disposal; putting the condensed lignin into an anaerobic cracking reactor and adding hydrogen for a reaction in the reactor, and adding a catalyst for catalytic cracking to obtain benzene and related by-products.

Description

technical field [0001] The invention relates to a method for treating lignin in an anaerobic biologically pretreated corn stalk viscose fiber pulp cooking liquid, which belongs to the comprehensive utilization technology for preparing viscose fiber from biomass, in particular to an anaerobic biologically pretreated corn A treatment method for lignin in straw viscose fiber pulp cooking liquor. Background technique [0002] Using traditional biomass to prepare viscose fiber, the cooking liquid is dark brown and red night, which is a high-concentration organic waste liquid such as lignin degradation products, hemicellulose, etc. Although there is recovery of incineration soda, preparation of organic fertilizers, black liquor cracking, etc. Technology, due to the complexity of the composition and the high cost of recycling, makes a lot of lignin resources waste and pollutes the environment. It meets the threshold of environmental pollution and limits the utilization of biomass. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00D21C11/04D21C5/00D21C3/02D21C1/00
CPCD21C1/00D21C3/022D21C5/005D21C11/0007D21C11/04
Inventor 侯哲生郑勇李宏强王文刚石敏戴传波马云海孙明革陈庆张洪艳田爱华连建伟王九刚刘发现梁嗣超张金翠王德林陈胜佟金任露泉殷敬华
Owner 吉林中之林农业科技有限公司
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