Novel process for preparing xylitol

A technology of xylitol and a new process, applied in the field of functional sugar alcohol production, can solve the problems of low hydrogenation efficiency, high production cost, and many auxiliary materials, and achieve the effects of improving hydrogenation efficiency, reducing labor intensity, and saving production costs

Active Publication Date: 2010-09-08
FUTASTE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems such as long technological process existing in the current xylitol production process, more auxiliary materials such as consumption of water, electricity, steam, acid and alkali, high production cost, low hydrogenation efficiency, and more catalyst loss, Provide a new xylitol preparation process with simple process, low production cost and high hydrogenation efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 20 tons of corn cobs into the hydrolysis kettle, add 160m of 0.2% sulfuric acid solution according to the solid-to-liquid ratio of 1:8 3 , cook at 90°C for 50 minutes, drain the waste liquid, then add a sulfuric acid solution with a mass concentration of 1.7% as a catalyst according to the solid-to-liquid ratio of 1:9, and hydrolyze it at 120°C for 3 hours to obtain xylose hydrolyzate 160m 3 , its dry matter concentration is 7%, acidity is 1.2%, and xylose content is 51%. Lead the hydrolyzate into the neutralization and decolorization tank, slowly add 20% calcium carbonate solution at 75°C to make the acidity 0.65%, and keep stirring, keep warm for one hour, then add 560kg of powdered activated carbon, and decolorize at 70°C After 40 minutes, xylose neutralization and decolorization solution was obtained, and its light transmittance was 75%.

[0033] Put the xylose neutralization and decolorization solution into the ion exchange column equipped with ion exchange re...

Embodiment 2

[0036] Put 10 tons of bagasse into the hydrolysis kettle, add 60m of 0.1% sulfuric acid solution according to the solid-liquid ratio of 1:6 3 , cook at 95°C for 40 minutes, drain the waste liquid, then add a sulfuric acid solution with a mass concentration of 1.6% as a catalyst according to the solid-to-liquid ratio of 1:8, and hydrolyze it at 125°C for 4 hours to obtain a xylose hydrolyzate of 70m 3 , its dry matter concentration is 6%, acidity is 1.15%, and xylose content is 47%. Lead the hydrolyzate into the neutralization and decolorization tank, slowly add 20% calcium carbonate solution at 70°C to make the acidity 0.6%, and keep stirring, keep warm for one hour, then add 250kg of powdered activated carbon, and decolorize at 75°C After 30 minutes, a xylose neutralized and decolorized solution with a light transmittance of 78% was obtained.

[0037] Put the xylose neutralization and decolorization solution into the ion exchange column equipped with ion exchange resin, and ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/18C07C29/141B01D15/08
Inventor 王成福周娟黄伟红田强张亮张洁
Owner FUTASTE PHARM CO LTD
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