Clean technology for producing D-xylose with screw pressure producing flashing spray explosion method

Abstract

The invention belongs to the field of biochemical engineering and relates to a clean technology for producing D-xylose with a screw pressure producing flashing spray explosion method. According to the clean technology, pretreatment is performed on wood fiber raw materials at first, then, a traditional sulfuric acid hydrolysis technology is replaced by the screw pressure producing flashing spray explosion technology to produce spray explosion materials rich in the D-xylose, feed liquid of the D-xylose is extracted through filter-press dehydration in a high concentration mode, therefore, subsequent decoloration, ion exchange, concentration, crystal separation technological processes are improved according to the characteristics of the feed liquid, and D-xylose products are obtained finally. Compared with a traditional sulfuric acid hydrolysis technology, the clean technology has the advantages of being capable of achieving continuous production, small in acid-base dosage, small in waste water discharge amount and low in energy consumption and cost. The obtained feed liquid is high in concentration of the D-xylose and extremely low in acid content, the complicated neutralization process of the technology can be removed, meanwhile, the decoloration, concentration and ion exchange technological processes are simplified, and the burdens in later-stage purification processing are greatly reduced. The clean technology for producing the D-xylose with the screw pressure producing flashing spray explosion method is simple, simple in industrial production, and capable of greatly improving the quality and the yield of D-xylose products.

Description

technical field [0001] The invention belongs to the technical field of biochemical industry, and relates to a novel cleaning process for producing D-xylose by utilizing the method of screw pressure-making, flash evaporation and spray explosion. Background technique [0002] The molecular formula of D-xylose is CH 2 OH(CHOH) 3 CHO, is a white needle-like crystal or crystalline powder, sweet taste, only 40% of the sweetness of sucrose, easily soluble in water, slightly soluble in ethanol, melting point 147 ~ 151 ℃, with dextrorotatory and variable optical activity, As a functional food base material, D-xylose is digested and absorbed without energy value. It can meet the needs of people who love desserts and worry about getting fat to the greatest extent. At the same time, it can promote the growth of bifidobacteria and intestinal peristalsis. , Bifidobacteria are beneficial bacteria, the more the bacteria are, the more beneficial to human health; the consumption of xylose c...

AI Technical Summary

Problems solved by technology

[0003] The existing traditional process uses sulfuric acid solution to hydrolyze lignocellulose to produce xylose. The amount of water, acid, and alkali used in the entire process is high, and the amount of acid, alkali, and high-salt wastewater to be treated is large and the cost is high, and the environmental pressure is relatively high; The hydrolysis temperature of sulfuric acid is 120°C, the hydrolysis time is about 2 hours, the hydrolysis cycle is long, and the hydrolysis efficiency is low. At the same time, the acid liquid and the material must be heated at the same time when the hydrolysis temperature is raised, so the steam consumption is high and the energy consumption is large; The mixing section needs to neutralize the sulfuric acid solution with alkali to form a large amount of gypsum (CaSO 4 ), the scale is difficult to remove, and at the same time, the local pH value is too high during the neutralization process, which will denature some xylose and affect the product quality; after adding alkali in the neutralization section, it is necessary to use ion exchange to remove the salt. The burden is heavier, resulting in higher water consumption and resin consumption

Images