Novel process for preparing xylitol

Abstract

The invention relates to a novel process for preparing xylitol, which belongs to the technical field of functional sugar alcohol production. Pre-treatment, hydrolysis, neutralization, decoloring, ion exchange, evaporation and concentration and chromatography are carried out to corncob or bagasse and other agricultural waste which contains hemicellulose, high-content xylose solution is collected and distillated, and then continuously hydrogenated, so that the xylose solution is converted into xylitol solution, and finally a xylitol crystal is obtained through refining, concentration, crystallization, centrifugation and drying; the process comprises: corncob-> pre-treatment->hydrolysis->neutralization and decoloring->ion exchange->evaporation and concentration->chromatography->high-content xylose solution collection and distillation-> hydrogenatio->refining->concentration->crystallization->centrifugation->drying->finished crystal xylitol product obtaining. The novel process for preparing xylitol saves a xylose crystallization procedure and a conversion process xylose crystal into sugar, shortens a production procedure, adopts a chromatography technology to improve the content of thexylose solution, facilitates the obtaining of high-content xylitol solution after hydrogenation can prepare the high-grade xylitol product, adopts a continuous hydrogenation process, improves the hydrogenation efficiency, reduces the labor intensity of a worker, and saves the production cost.

Description

technical field

[0001] The invention belongs to the technical field of functional sugar alcohol production, and in particular relates to a process for producing xylitol. Background technique

[0002] Xylitol is a functional sweetener produced from agricultural fiber waste such as corncobs and bagasse. Its sweetness is comparable to sucrose but contains no sugar. In recent years, it has gradually become the first choice for the production of sugar-free foods. The traditional xylitol production process is: hydrolyze the agricultural fiber waste containing hemicellulose with acid, and then further neutralize, decolorize, purify, concentrate, and crystallize the obtained hydrolyzate to obtain xylose crystals, and then xylose The crystals are melted, formulated into a certain concentration of xylose liquid, hydrogenated and reduced to xylitol, and finally refined, concentrated, crystallized, centrifuged, and dried to obtain xylitol crystals. The premise of this process to prepare...