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Efficient separating purifying technique for lignin, hemi-cellulose and cellulose

A technology of hemicellulose and lignin, which is applied in the field of high-efficiency separation and purification technology, can solve the problems of insufficient separation and extraction of lignin, hemicellulose and cellulose, the recovery rate of single components, and the inability to recycle, etc., to achieve economical improvement Benefits and social benefits, the effect of lowering temperature and reducing alkali consumption

Active Publication Date: 2016-12-07
长春达新水处理技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the steam explosion stage, a large amount of furfural will be produced due to high temperature, which cannot be recovered, and the smell is unpleasant, and the lignin is not separated and utilized
[0011] In summary, the biomass extraction methods in the prior art cannot fully separate and extract lignin, hemicellulose and cellulose, and methods that can only separate a single component have various problems such as low recovery rate

Method used

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  • Efficient separating purifying technique for lignin, hemi-cellulose and cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Step 1, 10Kg of water content is that the bagasse (removing pith) of 50wt% is placed in the digester, according to the quality of the absolutely dry bagasse and the total liquid mass (the quality of the water in the bagasse and the quality of the NaOH solution added) The ratio of the sum) is 1:8, 35Kg of NaOH solution with a mass concentration of 11.43% is added, and the mass of NaOH is adjusted to 10% of the total liquid mass; The bagasse is subjected to alkali pre-extraction; then a screw press is used for solid-liquid separation to obtain 35.4Kg of alkali pre-extraction solution and 7.75Kg of bagasse after alkali extraction. The content of pentose in the alkali pre-extraction solution is 2.45wt %, the mass concentration of NaOH is 10.4%.

[0056] In step 2, the 35.4Kg alkali pre-extraction solution obtained in step 1 is subjected to nanofiltration separation and concentration, using a roll-type nanofiltration membrane module with a molecular weight cut-off of 600 Dal...

Embodiment 2

[0065] Step 1. Place 3Kg of corn stalks with a moisture content of 10wt% in the digester, and according to the quality of the absolutely dry corn stalks and the total liquid mass (the sum of the quality of the water content in the corn stalks and the mass of the added NaOH solution) The ratio is 1:8, 21.3Kg of NaOH solution with a mass concentration of 10.14% is added, and the mass of NaOH is adjusted to be 10% of the total liquid mass; Alkali pre-extraction is carried out; then a screw press is used for solid-liquid separation to obtain 18.6Kg of alkali pre-extraction solution and 4.72Kg of corn stover after alkali extraction. The content of pentose in the alkali pre-extraction solution is 3.25wt%, The mass concentration of NaOH was 9.92%.

[0066] Step 2: Perform nanofiltration separation and concentration on the 18.6Kg alkali pre-extraction solution obtained in Step 1, using a roll-type nanofiltration membrane module with a molecular weight cut-off of 800 Daltons, the membr...

Embodiment 3

[0075] Step 1, be that 55.47wt% bamboo chips (here chooses Cizhu) of 55.47wt% are placed in the digester, according to the quality of the absolutely dry bamboo chips (the quality of the moisture content in the bamboo chips and the quality of the NaOH solution that adds) The ratio of the sum) to the total liquid mass is 1:6, add 10.6Kg of NaOH solution with a mass concentration of 6.3%, and adjust the NaOH mass to 5% of the total liquid mass; the digester is heated with heat transfer oil, and when the temperature reaches 140 ℃ Incubate for 2h, and carry out alkali pre-extraction on the bamboo chips; then use a screw press for solid-liquid separation to obtain 12.24Kg of alkali pre-extraction solution and 2.72Kg of alkali-extracted bamboo chips. The pentose in the alkali pre-extraction solution is obtained. The content is 2.10wt%, and the mass concentration of NaOH in the alkali pre-extraction solution is 4.5%.

[0076] In step 2, the 12.24Kg alkali pre-extraction solution obtai...

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Abstract

The invention relates to an efficient separating purifying technique for lignin, hemi-cellulose and cellulose and belongs to the technical field of biomass separation and purification. The efficient separating purifying technique is adopted for solving the problem that the biomass separation and purification method in the prior art cannot fully extract lignin, hemi-cellulose and cellulose. The separating purifying technique provided by the invention comprises the following steps: adopting NaOH solution for performing alkali extraction in advance on the biomass containing lignin, hemi-cellulose and cellulose and performing spiral shoving, thereby obtaining an alkali extraction solution and the biomass after alkali extraction; separating and concentrating the alkali extraction solution through a nano-filtration membrane, and then performing acid hydrolysis and centrifugal separation, thereby obtaining lignin, xylose and a nano-filtration penetrating solution containing NaOH; performing hot alkali extraction and spiral shoving on the biomass after the alkali extraction in advance, thereby obtaining cellulose and alkali extracting solution; separating and concentrating the alkali extracting solution through the nano-filtration membrane, thereby obtaining the nano-filtration concentrated solution containing lignin and the nano-filtration penetrating solution containing NaOH. According to the technique, lignin, hemi-cellulose and cellulose in the raw materials are fully separated; the technique is environment-friendly; the alkali recovery rate is high; the energy consumption of production is low.

Description

technical field [0001] The invention relates to a high-efficiency separation and purification process of lignin, hemicellulose and cellulose, and belongs to the technical field of biomass separation and purification. Background technique [0002] Biomass mainly refers to lignocellulose such as straws and trees other than grains and fruits in the process of agricultural and forestry production, scraps of agricultural products processing industry, agricultural and forestry wastes, and livestock manure and waste in the production process of animal husbandry. These biomasses are widely distributed, and if they can be reused, they will have great economic and social benefits. [0003] Crop straw is an important biological resource obtained in the process of crop production. About 2 billion tons of crop straw can be produced every year in the world. China is a big agricultural country and one of the countries with the most abundant crop straw resources, producing more than 600 mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/02D21C9/18
CPCD21C3/02D21C5/00D21C9/18
Inventor 高武刘晓秋黄宝能居涛严忠荫王仁斌
Owner 长春达新水处理技术有限公司
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