Membrane concentration process for preparing xylitol from viscose production pressed liquor

Abstract

The invention provides a membrane concentration process for pressing xylitol from viscose pressed liquor. The membrane concentration process comprises the following specific process steps: A, performing membrane concentration, wherein the viscose production pressed liquor is firstly prefiltered to remove large-particle impurities, penetrated liquor is circularly concentrated 2-4 times by virtue of a nanofiltration membrane, concentrated liquor obtained at the last time is diluted by being added with water and then fed into a ceramic membrane for being filtered, and the obtained concentrated liquor is the concentrated pressed alkali liquor; the feed liquor is diluted by being added with water and then enters the nanofiltration membrane before the penetrated liquor is filtered when the penetrated liquor is circularly condensed 2-4 times by virtue of the nanofiltration membrane; B, extracting hemicellulose to neutralize the concentrated pressed alkali liquor by adding acid to obtain hemicellulose liquid; C, performing enzymolysis, wherein compound enzyme is added into the hemicellulose liquid to generate enzymatic hydrolysis to obtain enzymatic hydrolysate; D, fermenting, wherein the enzymatic hydrolysate is fermented for 0.5-2 hours at 50-60 DEG C under the action of candida mycoderma bacteria; and E, purifying, wherein the fermented liquor is ultra-filtered to remove impurities, and the penetrated liquor is desalinized by virtue of the nanofiltration membrane, the obtained concentrated liquor is purified liquor of xylitol, and the xylitol is obtained by virtue of ion exchange, active carbon treatment, concentration and crystallization and separation.

Description

technical field [0001] The invention relates to the field of preparation of xylitol, in particular to a process for preparing xylitol by using pressed lye produced by viscose fiber as a 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 mo...

AI Technical Summary

Problems solved by technology

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