Method and device for extracting xylose from viscose fiber waste

Abstract

The invention belongs to the technical fields of waste resource recovery and xylose production, and in particular relates to a method and a device for extracting xylose from viscose fiber waste. The method comprises the following steps: (1) carrying out size mixing; (2) hydrolyzing; (3) neutralizing; (4) carrying out primary decolorization; (5) carrying out cation and anion exchange; (6) carryingout primary evaporation and concentration; (7) carrying out secondary decolorization; (8) carrying out secondary evaporation and concentration; (9) crystallizing, and carrying out centrifugal separation. The method is simple in process, mild in conditions, low in requirements for equipment, high in xylose recovery rate and less in amount of produced waste water, thus having a wide promotional value.

Description

technical field [0001] The invention belongs to the technical field of waste recycling and xylose production, and in particular relates to a method and a device for extracting xylose from viscose fiber waste. Background technique [0002] Xylose is a reducing sugar with the molecular formula C5H10O5. The sweetness of xylose is 72% of that of sucrose, which is close to the sweetness of glucose. It can improve the flavor and taste of sweets and inhibit odor. In the presence of a catalyst, xylose can be hydrogenated and reduced to generate xylitol, which can be used as a raw material for xylitol. Xylose has good food compatibility, and it can easily produce Maillard reaction during mixing with amino acids during heating. Fragrance effect. Xylose also has good health care functions, can activate bifidobacteria in the human intestinal tract and promote growth, improve the micro-ecological environment of the human body, and improve the body's immunity. Xylose is an important ch...

AI Technical Summary

Problems solved by technology

The direct raw material of this method is the waste lye of pressing that contains alkali and hemicellulose, and the raw material added in the processing process of lignin is 98.5% concentrated sulfuric acid, 95% industrial ethanol, and the cost is very high in the whole process, leading to the inability to promote the use of the technology

[0005] In the prior art 201410622101.2, a membrane concentration process for producing xylitol with viscose fiber squeeze liquid as raw material is disclosed. This scheme is directly aimed at the generation of waste lye in viscose fiber production. In the hemicellulose liquid raw material, Contains a large amount of spent alkali and salt, and needs to be neutralized with a large amount of acid. When hydrolyzing hemicellulose, the pH is controlled at 0, and the hydrolysis acidity is relatively high. The subsequent treatment and filtration process requires high corrosion resistance of the equipment, and the produced There are many waste acids, the purity of xylitol obtained is also low, the input of raw materials and equipment is large, the comprehensive cost is high, and the economic benefit is low

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