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A method for extracting and recovering hemicellulose in waste alkali from pressing

A technology for squeezing spent caustic soda and hemicellulose, which is applied in the extraction and recovery of hemicellulose in squeezing spent caustic soda, and in the field of chemical fiber manufacturing, can solve the problems of low hemicellulose recovery rate, etc. The effect of broadening the scope of recycling

Active Publication Date: 2015-10-28
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 relates to a method for recycling waste in the production of viscose fiber, more specifically, the invention relates to a method for extracting and recycling hemicellulose in waste caustic soda from pressing, which belongs to the field of chemical fiber manufacturing industry, especially viscose In the process of fiber production and manufacturing, it is used in the field of pressing waste caustic soda treatment. Background technique [0002] In the production process of viscose fiber, the lye after pulp porridge is squeezed contains a large amount of alkali, hemicellulose and other small amounts of impurities. At present, most domestic manufacturers have recovered the alkali through dialysis and membrane treatment. Generally, there are still a part of alkali, a large amount of hemicellulose and other impurities in the final liquid, and this part of the liquid is called squeezed waste alkali. Due to the low degree of polymerization of he...

Claims

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Application Information

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Patent Type & Authority Patents(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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