Method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass

A hemicellulose, separation and purification technology, applied in the field of hemicellulose separation and purification, can solve the problems of inability to cleanly dissociate biomass components, low efficiency of component conversion process, and few types of products, etc., and achieve high utilization rate , short time-consuming and convenient operation

Inactive Publication Date: 2012-12-26
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional separation methods and technologies cannot cleanly dissociate biomass components. The conversion process of components has low efficiency, fewer types of products, and serious pollution (such as cellulose industry)

Method used

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  • Method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass
  • Method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass
  • Method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass

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Embodiment 1

[0026] Taking poplar as an example to specifically illustrate the method for separating and purifying linear hemicellulose and branched hemicellulose from biomass in the present invention, such as figure 1 As shown, in this embodiment, the method includes:

[0027] Step 1. Peel the two poplar trunks, dry them and cut them into small pieces of 1 to 3 cm, grind them, pass through a sieve with an aperture of 1.0 to 3.0 mm to obtain two poplar powder, and then use 50 g of the dried poplar powder with a volume ratio of 2:1 toluene and ethanol were placed in a Soxhlet extractor for 6 hours to obtain dewaxed poplar, and then the dewaxed poplar was dried in an oven at 60°C for 16 hours.

[0028] Step two, treat the dewaxed poplar with sodium chlorite at 75℃ for 2h, and adjust the pH value between 3.6~3.8 with acetic acid. The residue obtained after treatment is washed with distilled water and ethanol, and then at 60℃ Bake for 16h to obtain holocellulose.

[0029] Step 3: The holocellulose w...

Embodiment 2

[0041] In Example 2, Caragana korshinskii was taken as an example to illustrate the method for separating and purifying linear hemicellulose and branched hemicellulose from biomass according to the present invention, and the method includes:

[0042] Step 1: Peel the trunk of Caragana korshinskii tree and dry it and cut it into small pieces of 1~3cm, grind it, pass through a sieve with an aperture of 1.0~3.0mm to obtain Caragana korshinskii powder, and then 50g dried Caragana korshinskii The powder was extracted with a volume ratio of 4:1 toluene and ethanol in a Soxhlet extractor to extract 50 g of ground two white poplar for 8 hours to obtain dewaxed Caragana korshinskii and dried in an oven at 60°C for 18 hours.

[0043] Step two, treat the dewaxed Caragana korshinskii with sodium chlorite at 85℃ for 3h, and adjust the pH value between 3.6~3.8 with acetic acid. The residue obtained after treatment is washed with distilled water and ethanol, and then at 40 Bake at ℃ for 18h to ob...

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Abstract

The invention discloses a method for separating and purifying straight-chain hemicellulose and branched-chain hemicellulose from biomass. According to the invention, lignin in the biomass is removed by using sodium chlorite; extractions are carried out by using 0.25M, 0.5M and 1.0M alkali solutions at 15 DEG C to 40 DEG C; and three alkali-soluble hemicellulose are subjected to graded purification by using an I2-KI solution. As a result of researches, agricultural and forestry biomass hemicellulose can form precipitate in the I2-KI solution. With the I2-KI solution, the precipitated hemicellulose component has low branching degree, and the hemicellulose component that is retained in the solution and is then precipitated by using ethanol has high branching degree. The straight-chain hemicellulose and branched-chain hemicellulose separating and purifying method provided by the invention has the advantages of simple technology and easy industrialization. With the graded purification process, straight-chain hemicellulose and branched-chain hemicellulose can be separated, such that hemicellulose with different structural properties can be obtained. Therefore, an application basis is provided for the industrialization of hemicellulose.

Description

Technical field [0001] The invention relates to a method for separating and purifying hemicellulose, in particular to a method for separating and purifying linear hemicellulose and branched hemicellulose from biomass. Background technique [0002] Agriculture and forestry biomass mainly includes two categories: agricultural straw and forest biomass. At present, the total forest biomass resources in my country are more than 18 billion tons. Arbors and shrubs are the main forest biomass resources in China. Every year, due to flat stubble, forest tending and thinning, fruit tree pruning, and wood processing residues, 800 to 1 billion can be obtained. Ton. These agricultural and forestry biomasses are mainly used for direct combustion to produce heat, and some are used as feed, fertilizer and raw materials for the pulp and paper industry, but the utilization in this area is less than 50% of the total agricultural waste. How to reasonably use these important green resources has very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 彭锋边静彭湃张学铭许凤孙润仓
Owner BEIJING FORESTRY UNIVERSITY
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