Method for extracting and recycling hemicellulose from squeezed alkali waste

A technology for squeezing waste caustic soda and hemicellulose, which can be used in rayon recycling, fiber chemical characteristics, textile/flexible product manufacturing, etc. , Improve the extraction rate and reduce the recovery cost

Active Publication Date: 2013-10-09
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 in the prior art that the hemicellulose recovered by alcohol analysis has a low degree of polymerization and cannot be used as a raw material for chemical synthesis, and provides a method for extracting and recovering hemicellulose with a high degree of polymerization from pressed waste caustic soda. This method can increase the degree of polymerization of the finished hemicellulose to over 80, and at the same time no longer use alcohol, simplify the treatment process and reduce the treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for extracting and recovering hemicellulose from pressed waste caustic soda, comprising the following process steps:

[0029] A. Neutralization

[0030] neutralizing the spent caustic soda with acid to a pH value of 2.5 to obtain a neutralized solution of spent caustic soda pressed;

[0031] B. Precipitation

[0032] The neutralization solution of the spent caustic soda obtained in step A is left to settle at room temperature to obtain a precipitated solution of the spent caustic soda squeezed;

[0033] C. to filter

[0034] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0035] D. dry

[0036] The filter residue obtained in step C is dried to remove water, and the hemicellulose recovered from the spent caustic soda is obtained.

Embodiment 2

[0038] A method for extracting and recovering hemicellulose from pressed waste caustic soda, comprising the following process steps:

[0039] A. Neutralization

[0040] Neutralizing the spent caustic soda with acid to a pH value of 4.5 to obtain a neutralized solution of spent caustic soda pressed;

[0041] B. Precipitation

[0042] The neutralization solution of the spent caustic soda obtained in step A is left to settle at room temperature to obtain a precipitated solution of the spent caustic soda squeezed;

[0043] C. to filter

[0044] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0045] D. dry

[0046] The filter residue obtained in step C is dried to remove water, and the hemicellulose recovered from the spent caustic soda is obtained.

Embodiment 3

[0048] A method for extracting and recovering hemicellulose from pressed waste caustic soda, comprising the following process steps:

[0049] A. Neutralization

[0050] neutralizing the spent caustic soda with acid to a pH value of 3.5 to obtain a neutralized solution of spent caustic soda pressed;

[0051] B. Precipitation

[0052] The neutralization solution of the spent caustic soda obtained in step A is left to settle at room temperature to obtain a precipitated solution of the spent caustic soda squeezed;

[0053] C. to filter

[0054] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;

[0055] D. dry

[0056] The filter residue obtained in step C is dried to remove water, and the hemicellulose recovered from the spent caustic soda is obtained.

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Abstract

The invention relates to a method for extracting and recycling hemicellulose from squeezed alkali waste, belongs to the field of chemical fiber preparation industry, and in particular relates to the field of squeezed alkali waste treatment in the adhesive fiber production and preparation process. According to the method, the hemicellulose in the squeezed alkali waste is recycled through steps of neutralization, sedimentation, filtration and drying; the pH value ranging from 2.5 to 4.5 is adopted as a final neutralization point, and beta-cellulose with a high polymerization degree can be directly separated out so that the hemicellulose with the high polymerization degree is obtained; the finished product, namely, the cellulose, comprises the following ingredients: greater than or equal to 95% of hemicellulose (absolutely dry), and less than or equal to 0.5% of ash content; the hemicellulose can be directly sold or is developed and used as a synthetic raw material for the next step.

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 recovering hemicellulose from pressed waste caustic soda, which belongs to the field of chemical fiber manufacturing industry, especially viscose In the process of rubber 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 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14D01F13/02
CPCY02P70/62
Inventor 王兵冯涛邓传东郭青龙杜金江
Owner YIBIN GRACE GROUP CO LTD
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