Atmospheric pre-treatment method of plant fiber material

A plant fiber and pretreatment technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of energy saving, cost increase, investment increase, etc., and achieve the effect of saving investment, reducing consumption, and investing in environmental protection.

Inactive Publication Date: 2009-05-06
陈培豪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dilute alkaline treatment alone cannot dissolve all the hemicelluloses, which will cause the peeling reaction of cellulose and hemicelluloses at the same time, and the monosaccharides produced will be isomerized into organic acids under alkaline conditions, reducing the yield of pentoses ; Only with the dilute acid method, the plant fiber material cannot be made into a single fiber-like cellulose material that is easily hydrolyzed by concentrated acid or enzyme during normal pressure hydrolysis, and acid-resistant and pressure-resistant containers are required during high-temperature and high-pressure hyd

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cut 10 grams of natural air-dried rice straw into about 2-3 cm long, add 50 ml of 8% sulfuric acid solution, cook at 70°C for 4 hours, and pass the generated steam into the condenser to condense to recover the acetic acid and furfural produced during the hydrolysis process. After pressure filtration, acid-containing sugar liquid and filter residue are obtained, and the filter residue is countercurrently washed to about pH 7 to obtain acid-boiled filter residue. Mix the acid boiled filter residue with 30 ml of alkaline cooking liquid containing sodium hydroxide, the concentration of sodium hydroxide after mixing is 5%, and then cook at 70°C for 2 hours. At the end, the acid boiled filter residue can be crushed into a pulp by hand . After the alkali boiling is completed, a refiner is used for refining while it is hot, so that the plant fiber raw material is separated into single fibers, and then solid-liquid separation is carried out to obtain black liquor and alkaline fi...

Embodiment 2

[0025] 10 grams of natural air-dried corn stalks are hammered and cut into about 2-3 cm long, add 50 ml of 30% sulfuric acid solution, cook at 75 °C for 1.5 hours, and the steam generated is passed into the condenser to condense to recover the hydrolysis process Acetic acid and furfural. After pressure filtration, acid-containing sugar liquid and filter residue are obtained, and the filter residue is countercurrently washed to about pH 7 to obtain acid-boiled filter residue. Mix the acid boiled filter residue with 30 ml of alkaline cooking liquid containing sodium hydroxide, the concentration of sodium hydroxide after mixing is 2%, and then cook at 90°C for 1 hour, at the end of the acid boiled filter residue can be crushed into a pulp by hand . After the alkali boiling is completed, a refiner is used for refining while it is hot, so that the plant fiber raw material is separated into single fibers, and then solid-liquid separation is carried out to obtain black liquor and al...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The invention discloses a normal pressure pre-treatment method for a plant fibrous material. Under normal pressure conditions, the plant fibrous material is cooked by dilute sulfuric acid first to hydrolyze hemicellulose into a pentaose solution; then a remaining part is cooked by dilute alkali solution to separate out most of lignin to obtain single fibriform cellulose; and the sulfuric acid and the alkali solution are recovered for circulating use. The single fibriform cellulose has a loose structure due to the fact that no hemicellulose is contained and only a small amount of lignin is contained, which can ensure that the rate of concentrated acid hydrolysis or enzyme hydrolysis of the cellulose is greatly accelerated. The pretreatment is finished under normal pressure, so the huge investment for a pressure vessel during high-temperature pretreatment is saved; the cooking temperature is basically lower than 100 DEG C, and the cheap heat energy obtained by the light-heat conversion of solar energy can be utilized as the heat energy for heating, so the using amount of coal is reduced; and process reagents, namely the sulfuric acid and sodium hydroxide can be recycled, so the method is a method which has less investment and is environment-friendly.

Description

[0001] Field [0002] The invention belongs to the field of biochemical industry, and relates to a method for utilizing plant fiber raw materials, in particular to a method for preparing sugar liquid, lignin and single fiber by normal-pressure pretreatment of plant fiber raw materials. Background technique [0003] Plant fiber raw materials are extremely abundant renewable resources in nature. If plant fiber raw materials can be well utilized, it will greatly reduce the cost of chemical raw materials and automobile fuel. But up to now, people are very insufficient to the utilization of plant fiber raw material. This is because the main components of plant fiber raw materials, cellulose, hemicellulose, and lignin are tightly combined, and their processing performance is also poor. The melting temperature of cellulose is higher than the decomposition temperature, so it does not have solubility and fluidity when heated to decomposition. To use plant fiber raw materials, a certa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D21C5/00
Inventor 陈培豪
Owner 陈培豪
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