Extracting method for medium and low temperature hemicellulose

A hemicellulose, low-temperature technology, applied in the chemical industry, can solve the problems of low yield, long extraction time, difficult separation and purification, etc., and achieve the effects of simple operation, improved yield and purity, and improved separation efficiency.

Inactive Publication Date: 2017-05-10
河南华禹环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional alkaline extraction method, the concentration of lye used is high (10%-15%), the extraction time is long (4-8h), and the hemicellulose products in the extract are degraded, so it is difficult to extract from lye Medium separation and purification, low yield

Method used

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  • Extracting method for medium and low temperature hemicellulose
  • Extracting method for medium and low temperature hemicellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The chemical composition of wheat straw is as follows: the total cellulose content is 71.23%, and the hemicellulose (pentose) content in the total cellulose accounts for 23.29% of the straw chemical composition; the total lignin content is 22.96%;

[0018] The present invention in concrete implementation, comprises the following steps:

[0019] (1) Raw material processing: cut the wheat straw into 1cm long, wash it with water, remove dust and impurities, and air dry;

[0020] (2) Degreasing: Degreasing the air-dried wheat straw with benzene alcohol solution for 6 hours, the reaction temperature is 50°C, the solid-to-liquid ratio of wheat straw and benzene alcohol solution is 1:10, the lipids in the raw materials are removed, and air-dried to obtain degreased wheat straw;

[0021] The benzyl alcohol solution is made by mixing toluene and ethanol with a volume ratio of 2:1;

[0022] (3) Ultrasonic-assisted alkali extraction: add 200g of defatted wheat straw to lye, when...

Embodiment 2

[0030] The chemical components of corn stalks are as follows: hemicellulose content 69.73%, of which the hemicellulose (polypentose) content in the total cellulose accounts for 19.65% of the chemical components of the straw; the total lignin content is 17.89%; Contains hemicellulose.

[0031] In specific implementation, the present invention may also include the following steps:

[0032] (1) Raw material processing: remove the pith from the corn stalks, cut them into 2cm×2cm pieces, wash them with water, remove dust and impurities, and air dry;

[0033] (2) Degreasing: Degreasing the air-dried corn stalks with benzene alcohol solution for 6 hours, the reaction temperature is 50°C, the solid-to-liquid ratio of corn stalks and benzene alcohol solution is 1:10, the lipids in the raw materials are removed, and air-dried to obtain defatted cornstalks;

[0034] The benzyl alcohol solution is made by mixing toluene and ethanol with a volume ratio of 2:1;

[0035] (3) Ultrasonic-as...

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Abstract

The invention relates to an extracting method for medium and low temperature hemicellulose, and is capable of effectively improving the extraction separation efficiency of the hemicellulose, shortening the extraction time, saving cost, and improving the product quality and yield. The method comprises the following steps: cutting plant fibrous raw materials to be sections or slices, washing, air-drying, degreasing by using benzyl alcoholic solution, adding a degreasing raw material to alkali liquor, heating, executing ultrasound reaction, sieving by using 200 meshes of a sieve, concentrating the filter liquor by using an ultrafiltration membrane, adjusting pH value to be 5.5, adding ethyl alcohol, stewing in the room temperature, centrifuging, washing sediment by using the ethyl alcohol, and washing the sediment to be neutral by using deionized water, freezing and drying to obtain the hemicellulose. The method is scientific and rational, and easy to operate. The production efficiency is high, the using effect is good, and the operation is simple and easy. The yield and purity of extracting the hemicellulose can be improved, the extraction separating efficiency of the hemicellulose is effectively improved, the extraction time is shortened, the cost is saved, and the quality and yield of the product are improved. The extracting method is a big innovation for extracting the hemicellulose, and has remarkable economic and social benefits.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a medium and low temperature hemicellulose extraction method. Background technique [0002] Hemicellulose is a general term for a class of complex polysaccharides. Its content in plant resources is second only to cellulose, and it is a renewable resource that can partially replace petrochemical industrial products. The composition of hemicellulose contained in different raw materials is different. For example, coniferous wood hemicellulose is mainly composed of polymannose, containing a certain amount of xylan; hardwood hemicellulose is mainly composed of xylan, containing a small amount of polymannose; Sugar, the branched chains of the same polysaccharide of different raw materials are often very different. [0003] Plant fiber raw materials are raw materials for the pulp and paper industry. In the traditional alkaline pulping process of plant raw materials, a large amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
CPCC08B37/0003
Inventor 刘洁张艳玲
Owner 河南华禹环保科技有限公司
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