Method for preparing feed-grade xylo-oligosaccharide through viscose squeezed alkali liquid

Abstract

The invention discloses a membrane concentration process for preparing feed-grade xylo-oligosaccharide through squeezed liquid from viscose production. The membrane concentration process comprises the following specific operation steps: A, filtering squeezed liquid from viscose production through a membrane, taking a concentrated solution and adding acid into the concentrated solution for neutralizing so as to obtain a xylan solution; B, carrying out enzymatic hydrolysis reaction on the xylan solution and compound enzymes so as to obtain an enzymatic hydrolysate and residues of enzymatic hydrolysis, adding water for diluting residues of enzymatic hydrolysis, preheating, carrying out centrifugal separation, taking supernatant namely the xylan solution and obtaining a secondary enzymatic hydrolysate under the effects of compound enzymes; C, mixing the enzymatic hydrolysates obtained in the step B, enabling the mixed solution to enter a nanofiltration membrane for desalting, so as to obtain a concentrated solution which is purification liquid of xylo-oligosaccharide, evaporating and drying so as to obtain the feed-grade xylo-oligosaccharide. The utilization ratio of xylan is high, production waste is reduced and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of xylooligosaccharide preparation, in particular to a method for preparing feed grade xylooligosaccharide by pressing lye from viscose fiber. Background technique [0002] Xylo-oligosaccharides are produced from xylan-rich plants through biochemical methods. At present, the production of xylo-oligosaccharides mostly uses corncobs as raw materials, and the production process is complicated and the cost is high. In the production process of viscose fiber made of chemical pulp (wood pulp, cotton pulp, straw pulp, reed pulp, etc.) first step. The high concentration of hemicellulose has an extremely adverse effect on the production process of viscose fiber and the quality of the finished product. Therefore, it is necessary to dissolve the hemicellulose with lye in the dipping process to obtain high-strength cellulose. Therefore, in the above process, it will A large amount of highly concentrated alkaline press liquor r...

AI Technical Summary

Problems solved by technology

This patent also has the problems of high production cost and low xylooligosaccharide yield