Method for hydrolysis of corncob under normal pressure

Abstract

The invention discloses a method for hydrolysis of corncob under normal pressure, belonging to the field of functional sugar production technology. The method adopts hydrolysis under normal pressure, the hydrolysis temperature is low and the hydrolysis condition is mild. The method includes the steps of: (1) pickling: breaking the corncob to be size of 1-2cm, putting the broken corncob in a hydrolysis kettle, adding sulfuric acid solution with mass concentration of 0.1-1.0% according to solid-to-liquid proportion of 1:5-1:10, heating to 90-100 DEG C, preserving heat for 20-60min, and discharging the waste liquid; (2) rinsing: adding purified water according to proportion of 1-5:1:10 between the pickled dry corncob and the water, heating to 80-100 DEG C, preserving heat for 20-60min and then discharging the waste liquid; and (3) hydrolysis under normal pressure: adding sulfuric acid solution with mass concentration of 1.0-2.0% according to the proportion of 1:8-1:12 between the pretreated corncob and the sulfuric acid solution, heating to 100 DEG C under normal temperature, maintaining the mixture boiling, preserving heat for 2-6h and then discharging the xylose hydrolysate. Detection finds that the dry substance concentration is 5-9%, the transmittance is 20-40% and the content of the xylose is 50-70%.

Description

technical field [0001] The invention belongs to the technical field of functional sugar production, and in particular relates to an atmospheric pressure hydrolysis method for corncobs in the process of producing xylose from corncobs. Background technique [0002] Xylose is an important functional sweetener widely used in food, chemical and other industries. At present, the production process of xylose is mainly based on corn cob as raw material, and is obtained through the steps of pretreatment-hydrolysis-neutralization-decolorization-separation-concentration-crystallization. Corn cob hydrolysis is the most basic and critical process for preparing xylose. The quality of hydrolysis is related to the sugar yield of corn cob and the control of subsequent costs. The hydrolysis of traditional corncobs mostly uses the hydrolysis of pentosan in corncobs into single molecule xylose under high temperature and high pressure conditions. Since xylose is a heat-sensitive monosaccharide,...

AI Technical Summary

Problems solved by technology

The hydrolysis of traditional corncobs mostly uses the hydrolysis of pentosan in corncobs into single molecule xylose under high temperature and high pressure conditions. Since xylose is a heat-sensitive monosaccharide, xylose molecules It is easy to generate furfural by internal dehydration reaction, and it can also undergo Maillard browning reaction with proteins, amino acids, colloids and other substances in it, which will deepen the color of the hydrolyzed solution and reduce the content of reducing sugar, which will affect the subsequent decolorization and ion exchange effects. Reduce the sugar production of corn cob and increase the unit consumption