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Method for extracting xylan from woody fiber material

A lignocellulosic material and a lignofiber technology, applied in the field of xylan extraction, can solve the problems of high production cost, dark product color, light product color and the like

Inactive Publication Date: 2003-07-23
GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The present invention mainly aims to solve the problem of extracting xylan from lignocellulosic materials in the prior art, the color of the product is too dark, the consumption of alkali is too large, the environmental pollution is difficult to control, or the production cost is too high, and the production process introduces toxic substances, which do not meet the requirements of food. Hygienic requirements and other issues, provide a very simple and convenient xylan extraction process, not only high yield of xylan extraction, but also effectively remove the lignin combined with xylan, so the product color is very light, can meet most The use requirements of the field; the extraction production process can greatly reduce the alkali consumption per unit weight of raw materials, making the waste water in the production process easy to treat, which not only meets environmental protection requirements, but also effectively reduces production costs.

Method used

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  • Method for extracting xylan from woody fiber material
  • Method for extracting xylan from woody fiber material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dry 100g of bagasse, add 2% sodium hydroxide, 400ml of 1% hydrogen peroxide solution, mix well in a conical flask, place at 28°C for 10 hours, then heat in a 750W microwave oven for 4 minutes, squeeze out 200ml of the solution, and use Wash once. Combine the two extraction solutions, neutralize to pH8 with hydrochloric acid, remove the precipitate by centrifugation, concentrate the supernatant in vacuum at 70°C to 100 ml, neutralize to pH4.5 with hydrochloric acid, add 300 ml of 95% ethanol, and centrifuge The precipitate was collected and dried to obtain 35 grams of off-white bagasse xylan. That is, the yield of product to material bagasse is 35%.

Embodiment 2

[0029]As the contrast of embodiment 1, do not add hydrogen peroxide in the sodium hydroxide solution of the present embodiment, and material ratio, as bagasse consumption, sodium hydroxide consumption etc., are all with embodiment 1. If treated by microwave, the extract is concentrated, precipitated with ethanol, and dried to obtain 15 grams of dark brown xylan product. Without microwave treatment, only 4 g of dark brown xylan product was obtained. That is, under the condition of the same amount of alkali used, the yield of xylan products obtained by a single alkali extraction process is only 1 / 9 of the present invention; only the extraction process of alkali-microwave is used, and the yield is not as high as that of the present invention. 50%, and they are all far less than the light color of the product of the present invention.

Embodiment 3

[0031] The raw material is corncobs instead, and other processing conditions are the same as in Example 1. Obtain off-white corncob xylan product 45 grams. That is, adopt corncob as raw material, the yield of product will be higher than bagasse.

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Abstract

A process for extracting xylan from wooden fibre material features that under the catalysis of microwave, the alkali solution containing hydrogen peroxide in directly sued to treat raw material for performing extraction of xylane and bleaching it at same time. Its advantages are high speed, less consumption of alkali, and high extracting rate. The resultant xylan solution can be deposited in organic solvent or superfilted and dried to obtain light-color xylan product.

Description

(1) Technical field: [0001] The invention belongs to the field of chemical industry and relates to a method for extracting xylan (or called hemicellulose) from lignocellulosic materials. (two) background technology: [0002] Lignocellulosic materials are extremely abundant renewable resources, and the use of such resources as industrial raw materials has always attracted people's attention. Xylan refers to natural polysaccharides other than cellulose in plant cell walls. It is a low-molecular-weight polysaccharide with a branched structure consisting of β-(1-4)-D-xylopyranose as the main chain (also known in the literature as for hemicellulose). In recent years, people have gained a deeper understanding of the properties of xylan and its derivatives, and discovered many new properties that have not been noticed before, showing that it has broad application prospects in food, chemical, pharmaceutical and other industrial fields. The development and utilization of xylan in l...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 张厚瑞何成新曾健智李典鹏蔡爱华阮俊
Owner GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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