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Method for saving water and reducing acid/alkali specific consumption in xylose production

A technology of acid-base specific consumption and xylose, which is applied in chemical instruments and methods, ion exchange regeneration, ion exchange bed cleaning/flushing, etc., can solve problems that do not involve the comprehensive utilization of waste acid, waste alkali and waste water, and achieve The effect of reducing raw water consumption, reducing consumption, and reducing sewage discharge

Active Publication Date: 2013-01-16
GANSU HEYUAN BIOLOGICAL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has simple process and short production cycle, but it does not involve the comprehensive utilization of waste acid, waste alkali and waste water, nor does it involve the problem of how to regenerate the regenerant

Method used

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  • Method for saving water and reducing acid/alkali specific consumption in xylose production
  • Method for saving water and reducing acid/alkali specific consumption in xylose production
  • Method for saving water and reducing acid/alkali specific consumption in xylose production

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: see figure 1 , taking the regeneration process of weak negative resin (D301 resin) as an example, to illustrate the method of saving water and reducing the specific consumption of acid and alkali in the xylose production process.

[0027] In the existing xylose production process, when the negative resin exchange column carries out the exchange regeneration reaction, 3% NaOH regenerant is added to the negative resin exchange column for resin regeneration. After the negative resin is regenerated, it needs to be washed with water, and the water In order to recover alkaline water in the early stage, the light transmittance of the alkaline water is less than 80%, and the flushing water with a light transmittance ≥ 80% is recovered, and the recovered water at this time is used as a rinse agent when the resin is rinsed.

[0028] This example is to recycle the waste alkali and alkaline wastewater in the negative resin exchange column in the xylose production proc...

Embodiment 2

[0033] Example 2: see figure 2 , taking the regeneration process of weakly positive D113 resin as an example to illustrate the methods of saving water and reducing the specific consumption of acid and alkali in the xylose production process.

[0034] In the existing xylose production process, when the positive resin exchange column is used for exchange regeneration reaction, 3% hydrochloric acid regenerant is added to the positive resin exchange column for resin regeneration. After the resin is regenerated, it needs to be washed with water. Recover acidic water whose light transmittance is less than 80%; recover flushing water with light transmittance ≥ 80%, and use the recovered water as a rinse agent for resin rinse.

[0035] This example is to recycle the waste acid and acid waste water in the positive resin exchange column in the xylose production process, and use the recovered waste acid and acid waste water for the exchange regeneration and hydrolysis of the macroporo...

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Abstract

The invention relates to a method for saving water and reducing acid / alkali specific consumption in xylose production, which comprises the following steps: recovering waste acid and waste alkali in the xylose production, acidic water and alkaline water in the macroporous weak resin elution process, and backwash water after the exchange of the macroporous weak resin and before the regeneration of the macroporous weak resin; respectively conditioning the recovered waste acid or waste alkali by using the recovered earlier-stage acidic water or alkaline water so as to regulate the concentration of the waste acid or waste alkali to 0.3-1.0%; carrying out exchange regeneration by using the conditioned waste acid or waste alkali as a regenerant of the macroporous weak resin; and by utilizing thehydrolyzability of the macroporous weak resin, carrying out hydrolysis regeneration by using the later-stage recovered acidic water or alkaline water as the eluant. The invention abandons the processthat the macroporous weak resin uses the fresh regenerant, reduces the consumptions of the resin washing water and the regenerant, lowers the production cost, reduces the environmental pollution, hasthe advantages of reasonable technological design and high popularization value, and is simple and convenient to operate.

Description

technical field [0001] The invention relates to an energy-saving method in the xylose production process, in particular to a method for saving water and reducing acid-base specific consumption in the xylose production process. Background technique [0002] Xylose production is mainly a functional sugar prepared from agricultural and sideline products such as corncobs, bagasse, birch, etc., through hot water soaking pretreatment, hydrolysis, decolorization, purification, concentration, centrifugation and packaging. Since xylose is extracted from agricultural by-products, in addition to sugar, colloids, pigments and impurities are also produced during the hydrolysis process. Liquid purification is a key process in the xylose production process. At present, the waste acid and alkali produced by the xylose industry contain a large amount of organic impurities, and recycling will pollute the resin instead. The amount of regenerant used is large, and it is difficult to wash; direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/00B01J49/60
Inventor 韩小航秦全生张洁程丽敏
Owner GANSU HEYUAN BIOLOGICAL PRODS