Method of extracting hemicellulose, cellulose and lignin from wood fiber raw materials

A technology for lignocellulosic raw material and hemicellulose, applied in the field of extracting hemicellulose, cellulose and lignin, can solve the problems of high production cost, long reaction time, harsh conditions, etc., and achieve high-efficiency hydrolysis, wide social and economic benefits , Environmentally friendly effect

Active Publication Date: 2012-07-11
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method firstly has long reaction time and high temperature, and needs to add acidic substances such as sulfuric acid and nitric acid, the conditions are harsh, and the production cost is high.

Method used

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  • Method of extracting hemicellulose, cellulose and lignin from wood fiber raw materials
  • Method of extracting hemicellulose, cellulose and lignin from wood fiber raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 3g shrub red willow powder crushed to 40-60 meshes and water are fully mixed in a mass ratio of 1:10, then transferred to the reaction kettle, placed in an oven and heated to 100°C, and reacted for 0.5 hours, Filtration obtains the first undissolved matter and the first filtrate;

[0028] (2) Fully mix the first undissolved matter with an organic solvent containing 0.5% NaOH and 60% methanol at a solid-to-liquid ratio of 1:10, react at 78°C for 3 hours, filter to obtain the second undissolved matter and the second Filtrate: the second undissolved substance is the target product cellulose;

[0029] (3) After the first filtrate and the second filtrate obtained by step (1) and step (2) are mixed, the pH of the solution is adjusted to 5.5 with hydrochloric acid, and after filtration, the solution is concentrated under reduced pressure on a rotary evaporator to a water content of 5 %, then add 2 times the volume of ethanol to the concentrated solution, and filter to obt...

Embodiment 2

[0033] (1) 3g shrub red willow powder crushed to 40-60 meshes and water are fully mixed in a ratio of 1:15 in mass ratio, then transferred to the reaction kettle, placed in an oven and heated to 120°C, and reacted for 2 hours, Filtration obtains the first undissolved matter and the first filtrate;

[0034] (2) Fully mix the first undissolved matter with an organic solvent containing 1% NaOH and 60% ethanol at a solid-to-liquid ratio of 1:20, react at 78°C for 3 hours, filter to obtain the second undissolved matter and the second Filtrate: the second undissolved substance is the target product cellulose;

[0035] (3) After the first filtrate and the second filtrate obtained in step (1) and step (2) are mixed, the pH of the solution is adjusted to 6.0 with hydrochloric acid, and after filtration, the solution is concentrated under reduced pressure on a rotary evaporator to a water content of 10 %, then add 3 times the volume of ethanol to the concentrated solution, and filter t...

Embodiment 3

[0039] (1) 3g shrub red willow powder crushed to 40-60 meshes and water are fully mixed in a mass ratio of 1:25, then transferred to the reaction kettle, placed in an oven and heated to 140°C, and reacted for 3 hours, Filtration obtains the first undissolved matter and the first filtrate;

[0040] (2) Fully mix the first undissolved matter with an organic solvent containing 2% NaOH and 60% ethanol with a solid-to-liquid ratio of 1:25, react at 78°C for 3 hours, filter to obtain the second undissolved matter and the second Filtrate: the second undissolved substance is the target product cellulose;

[0041] (3) After the first filtrate and the second filtrate obtained in step (1) and step (2) are mixed, the pH of the solution is adjusted to 6.0 with hydrochloric acid, and after filtration, the solution is concentrated under reduced pressure on a rotary evaporator to a water content of 15 %, then add 3 times the volume of ethanol to the concentrated solution, and filter to obtai...

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Abstract

The invention relates to a method of extracting hemicellulose, cellulose and lignin from wood fiber raw materials and belongs to the field of utilization and technology of biomass resources of agriculture and forestry. In the method, the hemicellulose is extracted from the wood fiber raw materials by using hot water, then the lignin is extracted by using alkaline organic solvent under mild conditions; and residual ingredients rich in the cellulose are further used for enzyme hydrolysis to prepare fermentable sugar solution, thereby achieving full-ingredient utilization of the hemicellulose, cellulose and lignin in the biomass resources of the agriculture and forestry. The method has simple process, and is environmentally friendly, the organic solvent can be recycled, thereby promoting the development of the green agriculture and forestry, and the method has wide social and economic benefits.

Description

technical field [0001] The invention relates to a method for extracting hemicellulose, cellulose and lignin from lignocellulosic raw materials, in particular to a method for efficiently hydrolyzing agricultural and forestry biomass resources and simultaneously extracting hemicellulose, cellulose and lignin components, belonging to Utilization and technology of agricultural and forestry biomass resources. Background technique [0002] Lignin is a natural organic polymer synthesized by the secondary metabolism of plants. It is one of the basic chemical components of coniferous woods, broad-leaved woods and grasses. Its content in nature is second only to cellulose. It is estimated that the world can produce 6×10 per year 14 tons of lignin. Lignin can be used as a rubber reinforcing agent and an adsorbent for metal ions in industry; it can be used as fertilizer, pesticide slow-release agent, soil improver, plant growth regulator and feed additive in agriculture; it can be use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08B37/14C08H7/00C12P19/14C12P7/10
CPCY02E50/16Y02E50/10
Inventor 肖领平孙润仓许凤史正军
Owner BEIJING FORESTRY UNIVERSITY
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