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Method for extracting hemicellulose from waste paper

A technology of hemicellulose and waste paper, applied in the field of resource regeneration and utilization, can solve the problems of high unit cost, low hemicellulose extraction rate, and large amount of three wastes, so as to reduce extraction costs, reduce solid waste generation, and reduce costs. low effect

Pending Publication Date: 2022-02-08
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies on hemicellulose extraction at home and abroad, but most of the raw materials are corn stalks, moso bamboo, rice straw, etc., the extraction rate of hemicellulose is low, the unit cost is high, and the amount of three wastes is generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method of extracting hemicellulose from waste paper of the present embodiment, comprises the following steps:

[0031] Step 1) At a temperature of 30°C, use a hydraulic pulper to disperse the waste paper into waste paper pulp with a pulp concentration of 3%, and filter to remove non-pulp impurities; the waste paper is national waste;

[0032] Step 2) At a temperature of 40° C., soak the waste paper pulp filtered in step 1) in 5% sodium hydroxide solution for 0.5 h to obtain material A;

[0033] Step 3) The material A is subjected to solid-liquid separation treatment, and the solid-liquid separation process adopts an automatic slag discharge centrifuge. The filter cloth aperture of the automatic slag discharge centrifuge is 200 mesh, and the waste paper and impregnation liquid after impregnation are obtained, and the impregnation liquid is collected as a material B, the hemicellulose content of material B is 10g / L;

[0034] Step 4) Material B is pretreated wit...

Embodiment 2

[0039] A kind of method of extracting hemicellulose from waste paper of the present embodiment, comprises the following steps:

[0040] Step 1) At a temperature of 40°C, use a hydraulic pulper to disperse the waste paper into waste paper pulp with a pulp concentration of 3.5%, and filter to remove non-pulp impurities; the waste paper is national waste;

[0041] Step 2) At a temperature of 50° C., soak the waste paper pulp filtered in step 1) with 8% sodium hydroxide solution for 1 hour to obtain material A;

[0042] Step 3) The material A is subjected to solid-liquid separation treatment, and the solid-liquid separation process adopts an automatic slag discharge centrifuge. The filter cloth aperture of the automatic slag discharge centrifuge is 300 mesh, and the waste paper and impregnation liquid after impregnation are obtained, and the impregnation liquid is collected as a material B, the hemicellulose content of material B is 15g / L;

[0043] Step 4) Material B is pretreate...

Embodiment 3

[0048] A kind of method of extracting hemicellulose from waste paper of the present embodiment, comprises the following steps:

[0049] Step 1) At a temperature of 50°C, use a hydraulic pulper to disperse the waste paper into waste paper pulp with a pulp concentration of 5.5%, and filter to remove non-pulp impurities; the waste paper is American waste;

[0050] Step 2) At a temperature of 70° C., soak the waste paper pulp filtered in step 1) with 15% sodium hydroxide solution for 3 hours to obtain material A;

[0051] Step 3) The material A is subjected to solid-liquid separation treatment, and the solid-liquid separation process adopts an automatic slag discharge centrifuge. The filter cloth aperture of the automatic slag discharge centrifuge is 500 mesh, and the waste paper and impregnation liquid after impregnation are obtained, and the impregnation liquid is collected as a material B, the hemicellulose content of material B is 19g / L;

[0052] Step 4) Material B is pretrea...

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Abstract

The invention discloses a method for extracting hemicellulose from waste paper, the method specifically comprises the following steps: 1) dispersing and beating the waste paper into waste paper pulp by using a hydrapulper, and filtering to remove non-paper pulp impurities; (2) dipping the waste paper pulp filtered in the step (1) in a 5-20% sodium hydroxide solution for 0.5-4 hours to obtain a material A; 3) performing solid-liquid separation treatment on the material A to obtain impregnated waste paper and impregnation liquid, and collecting the impregnation liquid as a material B; 4) pretreating the material B with a filter bag, then treating with a nanofiltration membrane to obtain a concentrated solution and a filtrate, and collecting the concentrated solution as a material C; 5) adding acid into the material C to obtain a precipitate which is a material D; 6) treating the material D with a ceramic membrane to obtain a concentrated solution and a filtrate, adding pure water for dialysis, collecting the concentrated solution as a material E, and 7) drying the material E to obtain the hemicellulose dry powder. The method has the advantages of high efficiency, low cost, no generation of three wastes, small influence on the environment and the like.

Description

technical field [0001] The invention relates to the technical field of resource regeneration and utilization, in particular to a method for extracting hemicellulose from waste paper. Background technique [0002] Waste paper is the recycled and reusable part of paper after use. Waste paper resources are relatively abundant and need to be processed. The price is cheaper and easier to obtain than pulp. Domestic pulp production is limited and there is a large gap. It is necessary to import and recycle a large amount of waste paper to produce packaging paper and cultural paper. Waste paper pulping is also one of the mainstream pulping methods in China in recent years, and its processing capacity accounts for the total pulp. More than 50% of the amount. Waste paper contains a lot of hemicellulose, and the output of waste paper is large. In addition to recycling it for papermaking, other efficient utilization methods need to be developed. [0003] As one of the three elements in...

Claims

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Application Information

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IPC IPC(8): C08B37/14
CPCC08B37/0003C08B37/006
Inventor 施晓旦赵吉金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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