Co-production of xylose, xylitol and arabinose from agricultural and forestry wastes

A technology of agricultural and forestry waste and arabinose, applied in the direction of biochemical equipment and methods, microorganisms, sugar production, etc., can solve the problems of waste of xylose mother liquor, waste of resources, environment, pollution, etc., to reduce salt content and increase production capacity Reduced effect

Active Publication Date: 2011-12-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the waste of xylose mother liquor is serious and has not been rationally utilized. Most of it is sold to caramel coloring factories as low-priced raw materials to produce caramel coloring,

Method used

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  • Co-production of xylose, xylitol and arabinose from agricultural and forestry wastes
  • Co-production of xylose, xylitol and arabinose from agricultural and forestry wastes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] (1) Preparation process of high-temperature cooking liquid:

[0072] Choose agricultural and forestry waste corn cobs as raw materials. The corncobs are crushed to 10 meshes, dust-removed, and washed with water. The pretreated corncobs are then pretreated. The pretreatment process selects the dilute oxalic acid soaking method that is easy to operate and simple in process. The soaking solution used in the pretreatment is 0.2% dilute oxalic acid, the mass fraction ratio of the used soaking solution to raw materials is 4:1, and the soaking temperature is 30°C, soaking time is 24h. After soaking, through plate and frame filtration, the soaking system is separated from solid to liquid to obtain pretreated raw materials and soaking liquid, and the soaking liquid is reused, and the separated pretreated raw materials are washed to adjust the pH value of the raw materials themselves to nearly neutral.

[0073] 5Kg (dry weight) of granular corn cobs after pretreatment and pre...

example 2

[0090] (1) Preparation process of high-temperature cooking liquid:

[0091] Choose agricultural and forestry waste corn cobs as raw materials. The corn cobs are crushed to 20 meshes, dust removal treatment, and washed with water in three pre-treatment procedures. The pretreated corncobs are then pretreated. The pretreatment process selects the dilute oxalic acid soaking method that is easy to operate and simple in process. The soaking solution used in the pretreatment is 0.5% dilute oxalic acid, the mass fraction ratio of the soaking solution and raw materials used is 8:1, and the soaking temperature is 60°C, soaking time is 12h. After soaking, through plate and frame filtration, the soaking system is separated from solid to liquid to obtain pretreated raw materials and soaking liquid, and the soaking liquid is reused, and the separated pretreated raw materials are washed to adjust the pH value of the raw materials themselves to nearly neutral.

[0092] Put 8Kg (dry weight...

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Abstract

The invention relates to a clean technique for co-producing xylose, xylitol and arabinose from agricultural and forestal waste, belonging to the field of utilization of agricultural and forestal waste. The technique comprises the following steps: pretreating and preprocessing the raw material, and hydrolyzing in a thermophilic digestion mode to prepare a hemicellulose hydrolysate; after centrifugalizing to remove solid residues, carrying out TiO2-loaded activated carbon photocatalysis or ion exchange resin decolorization and detoxification treatment on the hydrolysate; carrying out MVR (mechanical vapor recompression) concentration treatment and gradient-cooling crystallization to obtain a xylose product and a xylose mother solution; fermenting L-arabinose unconverted xylitol fermentationhigh-yield strain xylitol by using the xylose mother solution as the medium to produce the xylitol; centrifugalizing to remove thalli, and carrying out decolorization and desalting treatment by membrane-process or resin adsorption; separating by using a simulated moving bed or chromatographic separation technology to obtain a xylitol phase and an L-arabinose phase; and carrying out MVR or vacuum concentration treatment on the two phases, and crystallizing in a gradient programmed cooling mode to respectively obtaining a xylitol product and an L-arabinose product, wherein the two mother solutions can be recycled.

Description

technical field [0001] The invention relates to a cleaning process for joint production of xylose, xylitol and L-arabinose by utilizing agricultural and forestry wastes, especially using a high-temperature cooking process that is good for the environment to prepare agricultural and forestry wastes such as corncobs to obtain a hemicellulose hydrolyzate, which is processed by Purification and crystallization to obtain xylose crystals, xylose mother liquor adopts biological method to produce xylitol, and crystallizes to obtain xylitol and L-arabinose crystals after simulated moving bed separation. Background technique [0002] According to the data provided by the Ministry of Agriculture of my country, the amount of agricultural waste cellulose resources in China has reached 600 million tons, less than half of which are currently used for firewood, and most of them are burned and discarded; and the data provided by the Ministry of Forestry shows that my country's forestry waste ...

Claims

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Application Information

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IPC IPC(8): C13K13/00C12P19/02C12R1/72C12R1/74C12R1/725
Inventor 袁其朋王乐范晓光高雪美
Owner BEIJING UNIV OF CHEM TECH
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