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Pretreatment method for promoting biomass to efficiently extract xylose by mechanical method

A biomass and mechanical technology, applied in sugar production, xylose production, sugar production, etc., can solve the problems of low xylose extraction rate and high equipment requirements, achieve solvent safety, low environmental impact, and process conditions and device simple effect

Inactive Publication Date: 2019-12-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low extraction rate of traditional xylose and high equipment requirements, the present invention provides a two-step mechanical method to assist in promoting the extraction of xylose by alkaline method, remove lignin, and retain the cellulose-rich part.

Method used

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  • Pretreatment method for promoting biomass to efficiently extract xylose by mechanical method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The biomass raw materials (bamboo chips) are subjected to spiral extrusion and disc grinding successively.

[0031] 2. Add the raw materials obtained in step 1 to the alkali (sodium hydroxide) solution and mix with the alkali mass percentage concentration of 10%. Put it into the cooking reactor with a liquid-solid ratio of 10:1 (g / ml), and control the temperature at 121 ℃ , Keep for 45min, get a mixture (black liquor and rich cellulose);

[0032] 3. Centrifugally separate the black liquor and the cellulose-rich part obtained in step 2 and store them separately, and wash the cellulose-rich part with distilled water until the filtrate is colorless.

[0033] 4. To the black liquor obtained in step 2, add glacial acetic acid to adjust the pH to 5, then add 2 times the amount of glacial ethanol, stand overnight until the raw sugar is completely precipitated, centrifuge the obtained raw sugar, wash with ethanol, and dry.

[0034] 5. The crude sugar in step 3 is hydrolyzed with 72%...

Embodiment 2

[0037] 1. The biomass raw material (cotton stalk) is subjected to spiral extrusion and disc grinding successively.

[0038] 2. Add the raw materials obtained in step 1 to the alkali (sodium hydroxide) solution to mix, the alkali concentration is 10%, put it into the cooking reactor, the liquid-solid ratio is 10:1 (g / ml), control the temperature at 121 ℃, keep For 45 minutes, a mixture (black liquor and rich cellulose) is obtained.

[0039] 3. The black liquor and cellulose-rich part obtained in step 2 are stored separately, and the cellulose-rich part is washed with distilled water until the filtrate is colorless.

[0040] 4. To the black liquor obtained in step 2, add glacial acetic acid to adjust the pH to 5, then add 2 times the amount of glacial ethanol, stand overnight until the raw sugar is completely precipitated, centrifuge the obtained raw sugar, wash with ethanol, and dry.

[0041] 5. The crude sugar in step 3 is hydrolyzed with 72% concentrated acid, 30 ℃, constant temperat...

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Abstract

The invention discloses a separation method for efficiently extracting natural components from hemicellulose, cellulose and lignin by mechano-chemical method. The method comprises the following steps:a, performing screw extrusion treatment on raw materials; b, transferring the treated raw materials to a disk mill to perform further mechanical treatment; c, mixing the raw material after defibrination treatment and an alkali solution, transferring the mixture into a high-pressure sterilizing pot and treating for a certain time; d, after reaction, performing centrifugal separation on black liquid and cellulose-enriched parts; and e, adjusting the pH of the black liquid, performing precipitation to separate lignin and xylan, cleaning enriched cellulose and performing papermaking. The efficiency of extracting the xylan by chemicals is promoted by a mechanical method; meanwhile, the lignin in the biomass raw material is effectively separated out, the xylan purify is improved, the obtained lignin content is low and the cellulose-enriched part has the potential for producing natural color paste. The method has the advantages of high xylose extraction efficiency, simple process, no environmental pollution and the like.

Description

Technical field [0001] The invention relates to the utilization technology of natural wood fiber raw materials, in particular to a method for efficiently extracting xylose from wood fiber raw materials. Background technique [0002] The annual output of agricultural and forestry straw non-wood biomass materials such as cotton stalk and bamboo is relatively large. Most agricultural straw materials are discarded or burned, which not only causes a waste of resources but also causes huge environmental pollution. These straws are large in quantity and cheap and easy to obtain. The hemicellulose contained in the straws, among them, the application field and market demand of xylose as the most representative functional sugar are expanding year by year. After hemicellulose is extracted, the remaining cellulose part It can be used in pulp production to realize comprehensive utilization of resources. At present, the market price of pulp and functional sugar is relatively high. The two-st...

Claims

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Application Information

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IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 牟洪燕黄瑾樊慧明刘青君董晓斌
Owner SOUTH CHINA UNIV OF TECH