Method for extracting and recovering hemicelluloses in squeezed waste alkalis

A technology for squeezing waste caustic soda and hemicellulose, which is applied in the field of chemical fiber manufacturing, extraction and recovery of hemicellulose from squeezed waste caustic soda, can solve the problems of low recovery rate of hemicellulose, achieve market application expansion, increase extraction rate, The effect of widening the scope of recycling

Active Publication Date: 2013-10-02
YIBIN GRACE GROUP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of low recovery rate of hemicellulose in waste caustic soda pressing in the prior art, and provides a method for extracting and recovering hemicellulose in waste caustic soda pressing produced from viscose fiber, so as to improve the recovery rate of hemicellulose, At the same time, the amount of sulfuric acid is reduced, reducing recycling costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:

[0034] A. Neutralization

[0035] neutralizing the spent caustic soda with acid to a pH value of 8.5 to obtain a neutralized solution of spent caustic soda pressed;

[0036] B. Precipitation

[0037] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;

[0038] C. to filter

[0039] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0040] D. dry

[0041] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.

Embodiment 2

[0043] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:

[0044] A. Neutralization

[0045] neutralizing the spent caustic soda with an acid to a pH value of 10 to obtain a neutralized solution of the spent caustic soda squeezed;

[0046] B. Precipitation

[0047] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;

[0048] C. to filter

[0049] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0050] D. dry

[0051] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.

Embodiment 3

[0053] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:

[0054] A. Neutralization

[0055] neutralizing the spent caustic soda with acid to a pH value of 9.25 to obtain a neutralized solution of spent caustic soda pressed;

[0056] B. Precipitation

[0057] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;

[0058] C. to filter

[0059] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0060] D. dry

[0061] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.

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PUM

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Abstract

The invention relates to a method for extracting and recovering hemicelluloses in squeezed waste alkalis, belongs to the chemical fiber making industry field, and especially belongs to the processing field of the squeezed waste alkalis in the viscose fiber production making process. Hemicelluloses in the squeezed waste alkali are recovered through neutralizing, precipitating, filtering and drying steps. The method adopts alkalescence as a neutralizing end point, and the polymerization degree of the hemicelluloses is high, so the recovery rate can reach above 80%. The finally obtained hemicelluloses comprise 95% or more of the hemicelluloses (oven dry) and 0.5% or less of ash, and can be sold directly or exploited as a next-step synthesis raw material.

Description

Technical field [0001] The invention involves the recycling method of waste in the production of adhesive fiber production. More specifically, the present invention involves a method of extracting and recycling in a semi -cellulose in a squeezing waste alkali.Pressing waste -squeezed squeezing squeeze -sarcasis treatment in the process of fiber manufacturing. Background technique [0002] During the production of adhesive fiber, the porridge contains a large amount of alkali and semi -cellulose and other amounts of impurities through the squeezing alkali and liquid. At present, most domestic manufacturers have recycled alkali through dialysis and membrane treatment.The remaining part of the liquid is generally leftover part of the alkali and a large amount of semi -cellulose and other impurities. This part of the liquid is called the squeezing waste.Due to the low degree of polymerization in the squeezing waste alkali and other impurities, it is difficult to recycle treatment tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 王兵冯涛邓传东郭青龙干友华
Owner YIBIN GRACE GROUP CO LTD
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