Normal atmosphere degreasing crude glycerine pretreatment method for separating wood fiber biomass components

A lignocellulosic and lignofiber technology, applied in the field of separation and classification of lignocellulosic biomass components

Inactive Publication Date: 2009-05-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

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Effect test

Embodiment 1

[0020] Put corn stalks with a length of 10-20mm and a weight of 10g into a digester, add 300g of a 40% concentration of degreased glycerin solution, stir evenly, and heat up under atmospheric pressure in a digester with a power of 800-1500W. The heating time is 60-150min. After the temperature was raised to 210°C and heat-preserved for 4 hours, the autocatalytic pretreatment process of glycerin was basically completed, resulting in a large amount of lignin-hemicellulose complexes peeling off from the cellulose and dissolved in the glycerol solution. When cooling down to 180-120°C, add 200ml of 30-60% circulating glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so that the hemicellulose and lignin peeled off from the cellulose are fully dissolved in the glycerin solution middle.

[0021] Separation of cellulose: after cooling, carry out solid-liquid separation, use G 3 Sand core funnel carries out vacuum suction filtration, with 400ml te...

Embodiment 2

[0026] Put rice straw with a length of 10-20mm and a weight of 10g into a digester, add 300g of a 60% concentration of degreased glycerin solution, stir evenly, autocatalyze glycerin under atmospheric pressure, and heat up in a digester with a power of 800-1500W To 260°C, the heating time is 60-90min. After raising the temperature to 260°C and cooking for 4 hours, the glycerin treatment process was basically completed, causing a large amount of lignin-hemicellulose complexes to peel off from the cellulose and dissolve in the glycerol solution, which also led to the degradation of part of the cellulose. When cooling down to 180-120°C, add 200ml of 30-60% circulating glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so that the hemicellulose and lignin peeled off from the cellulose are fully dissolved in the glycerin solution middle.

[0027] Separation of cellulose: after cooling, carry out solid-liquid separation, use G 3 Sand core funne...

Embodiment 3

[0032] Put wheat straw with a length of 10-20mm and a weight of 10g into a digester, add 200g of 80% degreased glycerin solution, stir evenly, and heat up in a digester with a power of 800-1500W through glycerin autocatalysis under atmospheric pressure , The heating time is 60-90min. After raising the temperature to 240°C and cooking for 2 hours, the glycerol treatment process was completed, causing a large amount of lignin-hemicellulose complexes to peel off from the cellulose and dissolve in the glycerol solution. When cooling down to 180-120°C, add 200ml of 30-60% circulating glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so that the hemicellulose and lignin peeled off from the cellulose are fully dissolved in the glycerin solution middle.

[0033] Separation of cellulose: after cooling, carry out solid-liquid separation, use G 3 Sand core funnel carries out vacuum suction filtration, with 400ml temperature is 40-80 ℃, concentratio...

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Abstract

The invention relates to a normal pressure degreased crude glycerin pre-treatment method for realizing the separation of components of wood fiber biomass. The method comprises the following steps: the wood fiber biomass and the degreased crude glycerin are evenly mixed; under atmospheric pressure or micro-pressure, by auto-catalysis of the glycerin or addition of catalyst, the mixture is heated up and cooked; after cooking, the mixture is cooled down and the components of the mixture are fully dissolved; after filtering and washing, glycerin cellulose with good enzymolysis property is obtained; the filtrate is regulated to be weak acid, condensed, deposited in ethanol, and filtered for the second time to obtain semi-cellulose components; and the secondary filtrate is reclaimed by the ethanol, regulated to be strong acid, deposited and centrifuged to obtain the glycerin lignose component. The method has the advantages of not only facilitating economic utilization of low-grade crude glycerin, but also solving the potential danger of organic solvent such as low-boiling point ethanol in the magnification process of the pulping process, such as high pressure operation and easy burning and explosion of volatile gases.

Description

technical field [0001] The invention is a method for separating and classifying the components of lignocellulosic biomass, belonging to the field of biochemical engineering of lignocellulosic biomass, and relates to the industrial and technological process of using degreased crude glycerin to pretreat lignocellulosic biomass to realize component separation. formula. Background technique [0002] The carbohydrates in natural lignocellulosics vary widely, and their structure is extremely complex, which is manifested in the following aspects: the content of cellulose and hemicellulose in lignocellulosic biomass from different species is different; the cellulose from different species The structure of hemicellulose is different; the same wood fiber is composed of many macromolecules in a complex and compact structure. These lead to the complex and dense structure of lignocellulosic biomass, and it is difficult to directly utilize high-value, especially lignin, as the adhesive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00D21C1/00D21C3/00C08H7/00
Inventor 陈洪章孙付保
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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