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Process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest

A technology for xylose hydrolyzate and xylose mother liquor, which is applied in the field of preparation of high-purity xylose and xylitol, can solve the problems of inability to crystallize and recover xylose, reduce the economic benefit of xylose production, etc. The effect of low cost and good adsorption and separation performance

Inactive Publication Date: 2007-06-06
JIANGNAN UNIV
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  • Claims
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Problems solved by technology

The present method has the following problems: the xylose solution obtained by hydrolysis contains impurities such as glucose, arabinose, mannose and a small amount of galactose, and xylose is crystallized twice; every ton of crystallized xylitol produced will produce one ton Mother liquor, the sugar concentration in the mother liquor is about 70%~80%, of which glucose contains 6%~12%, xylose contains 60%~70%, arabinose contains 17%~23%, galactose contains ~6%
Due to the existence of a large amount of miscellaneous sugar in the mother liquor, the xylose contained in it cannot be crystallized and recovered, and can only be sold to the caramel pigment factory at a price of 10% of the crystallized xylose product, which greatly reduces the economic benefits of xylose production

Method used

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  • Process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest
  • Process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest
  • Process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest

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Embodiment 2

[0051] The feed liquid is xylose mother liquor, wherein the refractive concentration is about 63% (wherein glucose ~ 15%; xylose ~ 50%; galactose ~ 6%, arabinose ~ 22%). The refractive concentration is about 56% (glucose ~ 2%; xylose ~ 60%; galactose ~ 10%, arabinose ~ 26%), this mother liquor is added to the hydrogenation reactor, and 5% Raney nickel catalyst is added, After the hydrogen pressure in the reactor reaches 50 bar, heat to 125° C., keep the pressure, and stop the hydrogenation after reacting for 8 hours. The reducing sugar content is less than 0.1% as measured by the Bertrant method to obtain the xylitol mother liquor. Its refractive concentration is 55%, and its xylitol content is about 62%.

[0052] The operating conditions of the simulated moving bed are as follows: the separation temperature is 75°C, the system pressure is 1.0Mpa, the feed rate of the feed liquid is 1L / h, and the feed rate of the elution water is 2.5L / h, and the feed reaches equilibrium after ...

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Abstract

Disclosed is a process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest, which comprises, using xylose hydrolysate or xylose mother liquid as the raw material, removing glucose through saccharomyces cerevisiae fermentation, then imitating moving bed, using water as eluent, completely separating xylose from foreign matter such as arabinose, thus obtaining component containing rich xylose.

Description

technical field [0001] The invention relates to a preparation method of high-purity xylose and xylitol, in detail, it relates to the clever use of special resin and simulated moving bed to separate and prepare high-purity xylose or xylitol from xylose hydrolyzate or xylose mother liquor. Background technique [0002] Xylose is a water medium of plant polycondensed pentose sugar. Its appearance is white crystal, its sweetness is equivalent to 67% of that of white sugar, and its calories are equivalent to glucose. It is widely used in food additives, biological culture agents, chemical reagents, etc. Now it is mainly produced by Obtained by hydrolysis of xylan in vegetable raw materials. Xylitol is mainly produced by reducing xylose, which has low calorie and anti-caries properties. The present method has the following problems: the xylose solution obtained by hydrolysis contains impurities such as glucose, arabinose, mannose and a small amount of galactose, and xylose is cry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/02C07H3/02C07H1/06
Inventor 彭奇均
Owner JIANGNAN UNIV
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