Membrane filtration technology for preparing xylitol from viscose fiber squeezed alkali solution

A technology for squeezing lye and viscose fibers, which is applied in the directions of sugar production, sugar production, xylose production, etc., can solve the problem of high cost, and achieve the effects of low cost, low alkali concentration and less damage

Inactive Publication Date: 2015-03-11
YIBIN YATAI BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent uses industrial ethanol to extract hemicellulose, which is costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The membrane filtration process of producing xylitol with viscose fiber pressed lye as raw material, the specific process steps are as follows:

[0043] A. Membrane concentration

[0044]The squeezed liquid produced by viscose fiber is pre-filtered to remove large particles of impurities, the permeate is concentrated twice through the nanofiltration membrane cycle, and the last concentrated liquid enters the diffusion dialysis cation exchange membrane stack, and the obtained concentrated liquid is the concentrated liquid of the squeezed liquid. liquid; the nanofiltration membrane is concentrated 2 times in circulation, and before each filtration, the feed liquid enters the nanofiltration membrane after being diluted with water;

[0045] B. Extract semi-fiber

[0046] Add acid to neutralize the concentrated solution of the squeezed lye to obtain a semi-fiber liquid.

[0047] C. Hydrolysis

[0048] Add dilute sulfuric acid to the semi-fiber liquid to undergo hydrolysis...

Embodiment 2

[0054] The membrane filtration process of producing xylitol with viscose fiber pressed lye as raw material, the specific process steps are as follows:

[0055] A. Membrane concentration

[0056] The squeezed liquid produced by viscose fiber is pre-filtered to remove large particles of impurities, the permeate is circulated and concentrated through the nanofiltration membrane for 3 times, and the last concentrated liquid enters the diffusion dialysis cation exchange membrane stack, and the obtained concentrated liquid is the concentrated liquid of the squeezed liquid. Liquid; described nanofiltration membrane circulation concentrates 3 times, and before each filtration, feed liquid all enters nanofiltration membrane after being diluted with water;

[0057] B. Extract semi-fiber

[0058] Add acid to neutralize the concentrated solution of the squeezed lye to obtain a semi-fiber liquid.

[0059] C. Hydrolysis

[0060] Add dilute sulfuric acid to the semi-fiber liquid to underg...

Embodiment 3

[0066] The membrane filtration process of producing xylitol with viscose fiber pressed lye as raw material, the specific process steps are as follows:

[0067] A. Membrane concentration

[0068] The squeezed liquid produced by viscose fiber is pre-filtered to remove large particles of impurities, the permeate is concentrated 4 times through the nanofiltration membrane cycle, and the last concentrated liquid enters the diffusion dialysis cation exchange membrane stack, and the obtained concentrated liquid is the concentrated liquid of the pressed liquid Liquid; described nanofiltration membrane circulation concentrates 4 times, and before each filtration, feed liquid all enters nanofiltration membrane after being diluted with water;

[0069] B. Extract semi-fiber

[0070] Add acid to neutralize the concentrated solution of the squeezed lye to obtain a semi-fiber liquid.

[0071] C. Hydrolysis

[0072] Add dilute sulfuric acid to the semi-fiber liquid to undergo hydrolysis; ...

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Abstract

The invention provides a membrane filtration technology for preparing xylitol from viscose fiber squeezed alkali solution. The technology is characterized by comprising the following steps: step A, membrane condensation: pre-filtering squeezed liquid generated during the viscose fiber production process so as to remove the large particle impurities, cyclically condensing the filtrate by a nano-filter membrane for 2 to 4 times, and transferring the last concentrate to a diffusion-dialysis cation exchange membrane stack so as to obtain the concentrate namely the concentrate of squeezed liquid, wherein the nano-filter membrane cyclic concentration is performed for 2 to 4 times, and before each filtration, the liquid should be diluted by water before being filtered by the nano-filter membrane; step B, semi-fiber extraction: adding acid into the concentrate of the squeezed alkali liquid to neutralize the concentrate so as to obtain a semi-fiber solution; step C, hydrolysis: adding diluted sulfuric acid into the obtained semi-fiber solution to carry out hydrolysis reactions; step D, purification: filtering the hydrolysate by a ceramic membrane, then filtering the filtrate by a nano-filter membrane to remove the salts, decoloring the concentrate by active carbon to obtain a purified solution of xylose; step E, hydrogenation: introducing hydrogen gas into the purified solution of xylose to carry out hydrogenation reactions in the presence of a catalyst namely nickel so as to obtain the xylitol.

Description

technical field [0001] The invention relates to the field of xylitol preparation, in particular to a membrane filtration process for producing xylitol by using viscose fiber pressed lye as raw material. Background technique [0002] The sweetness of xylitol is equivalent to sucrose, and the heat is equivalent to glucose. Xylitol can adjust the abnormality of sugar metabolism and is a nutritional and therapeutic agent for diabetics. Xylitol has a strong anti-ketone body effect and can be used to rescue patients with ketone bodies. Xylitol can slow down the production of fatty acids in plasma, but it will not increase blood sugar. It is also a liver-protecting drug for patients with hepatitis. Xylitol has good thermal stability and does not produce chemical reactions when heated together with amino acids. It can be formulated with amino acids in various preparations as nutraceuticals. As a food, xylitol also has a special anti-caries function. However, xylitol is one of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/18C07C29/141
CPCC07C29/141C08B9/00C08B37/14C13K13/002C13K13/007
Inventor 邓传东冯涛孙毅唐孝兵莫世清周林罗红梅
Owner YIBIN YATAI BIOTECH
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