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Method for separating non-wood lignocellulosic biomass lignin with composite solvents

A technology of lignin and extraction method, applied in continuous pulping process, pulping with inorganic alkali, etc., can solve the problems of crude lignin yield not higher than 65%, degradation of lignin molecular structure, low purity, etc.

Inactive Publication Date: 2012-10-03
NANJING FORESTRY UNIV
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Problems solved by technology

The extraction time of the existing separation method is 120 hours, and it is all carried out under the condition above normal temperature; the yield of crude lignin is not higher than 65% and the purity after purification is lower than 99%, when the yield is higher than 65%, the lignin The molecular structure of the protein will be severely degraded

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  • Method for separating non-wood lignocellulosic biomass lignin with composite solvents
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  • Method for separating non-wood lignocellulosic biomass lignin with composite solvents

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Embodiment Construction

[0019] Separation process:

[0020] Below through specific embodiment and in conjunction with appendix image 3 Explain the separation process: remove the leaves, ears, sheaths and nodes of wheat grass, grind 40-60 mesh grass powder through a plant grinder, and then extract with benzene alcohol (benzene and ethanol, the volume ratio is 2:1) and hot water extraction , air-dried for later use. Weigh 6g of absolute dry grass powder into a 500ml polyethylene bottle, stir, and pre-cool at -10°C for 3 hours, weigh 10g, 8g, 6.5g and 69.5g of sodium hydroxide, urea, thiourea and deionized water g mixed and poured into a 500ml polyethylene bottle, mixed and pre-cooled at -10°C for 3 hours.

[0021] After pre-cooling, quickly pour the alkali compound solution into a stirring bottle containing grass powder, stir at 8000rpm for 3 minutes, then transfer to a 500ml centrifuge bottle, and centrifuge at 12000rpm for 10 minutes at -10°C. The centrate and residue were collected separately....

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Abstract

The invention relates to a method for separating non-wood lignocellulosic biomass lignin from pulp lignin with composite solvents. The method comprises the steps of extraction, separation and purification. The method utilizes sodium hydroxide / urea / thiourea / aqueous solution systems to separate much wheat straw lignin successfully at low temperature, the receiving rate of crude lignin reaches 60%, the receiving rate of pure lignin reaches 30%, and the purity of the isolated lignin can reach 99%. The time span of separating processes is very short and only needs 16 minutes, thereby protecting the chemical structure of the lignin effectively, and keeping ester linkages between lignin molecules in a relatively intact mode.

Description

technical field [0001] The invention belongs to the biological field, and in particular relates to a method for separating non-wood lignocellulosic biomass and pulp lignin by using a composite solvent. Background technique [0002] Lignin is the second most environmentally friendly biopolymer substance on the earth, and it mainly exists in plants such as wood, grass and crop straw. The content in the plant is about 15%-36%. It is a non-toxic high polymer with its functional characteristics. Lignin is a high polymer with complex spatial structure formed by linking phenylpropane structural units through ether bonds and carbon-carbon bonds. The abundant benzene rings, carbon chains, methoxyl groups, hydroxyl groups, carbonyl groups, and carboxyl groups in the lignin molecular structure make it have great potential industrial application value. Lignin derivatives have excellent properties and are widely used in concrete, inks, paints, and soil water-retaining agents. The hydro...

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Application Information

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IPC IPC(8): D21C3/02D21C3/24
Inventor 翟华敏卞斌彬
Owner NANJING FORESTRY UNIV
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