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Process for preparing xylitol by using corn core or agriculture and forestry castoff

A technology for agricultural and forestry waste and xylitol, which is applied in the field of xylitol production and can solve the problems of low recovery rate of xylitol and the like

Active Publication Date: 2009-12-23
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current process uses activated carbon, ion exchange resin, etc. to decolorize and purify the xylitol fermentation broth, but there is still the problem that the recovery rate of xylitol is not high

Method used

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  • Process for preparing xylitol by using corn core or agriculture and forestry castoff
  • Process for preparing xylitol by using corn core or agriculture and forestry castoff
  • Process for preparing xylitol by using corn core or agriculture and forestry castoff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The pretreatment of embodiment 1. corncob

[0063] Take 100Kg corncobs, manually pick out the large and small impurities, add tap water, turn them manually, and clean the soil and dust on the surface of the corncobs. Then drain the sewage and measure the moisture content of the corn cob. Put the corn cob into the 1000L sugar reactor, then add 0.1% H 2 SO 4 Solution 600Kg, in 600Kg dilute acid solution, 0.1% sulfuric acid is 0.61Kg, water is 599.39Kg (the moisture inhaled when the corn cob is washed with water should also be deducted), heated to 80°C while stirring, staying for 1 hour, releasing dilute sour water.

[0064] The enamel kettle (manufactured by Zibo Industrial Enamel Factory) is anchored and stirred at a speed of 60 rpm, and the jacket is heated and cooled.

Embodiment 2

[0065] Embodiment 2. the acid hydrolysis of corncob

[0066] Then according to the weight ratio of corn cob:dilute acid solution=1:6, add 0.8% H 2 SO 4Solution 600kg, in 600kg of dilute acid solution, 98% sulfuric acid is 4.9Kg, water is 595.1Kg (note that after 0.1 dilute pickling, the total amount of water that is more than the moisture contained in commercial corn cobs should be deducted), under the condition of stirring Heating to 110°C and keeping it for 2 hours, the acidolysis ends.

[0067] The condition of enamel still is with embodiment 1

Embodiment 3

[0068] Example 3. Acid hydrolysis of corn stalks

[0069] Corn stalks are pulverized (through a 3mm sieve), and 0.8% H 2 SO 4 Solution 600kg, in the dilute acid solution of 600kg, 98% sulfuric acid is 4.9Kg, and water is 595.1Kg, is heated to 110 ℃ under the situation of stirring, keeps 2 hours, and acidolysis finishes.

[0070] The condition of enamel still is with embodiment 1

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Abstract

The invention provides a method for producing xylitol by using corn cob or agricultural and forestry wastes such as straw as raw materials. The method includes pretreatment of raw materials; dilute acid treatment of raw materials; solid-liquid separation; after decolorization, filtration, deacidification and RO concentration of the obtained liquid phase components, yeast fermentation is used to obtain xylitol. After sterilization, concentration and chromatographic separation of the fermentation broth, a relatively pure xylitol liquid is obtained, and then decolorization, deliming, concentration, crystallization, separation and drying are carried out to obtain solid finished product xylitol, and the crystallization mother liquor is returned to chromatographic separation. In addition, in the present invention, the solid-phase components obtained by solid-liquid separation after acid hydrolysis are slurried, and then used for ethanol fermentation after enzymatic hydrolysis; and the lignin residue obtained after filtration of the enzymatic hydrolysis product can be used as fuel, or used for Develop deep-processed products of lignin. The xylitol production method of the present invention greatly reduces the cost of industrialized production of xylitol, and enables all components of the raw material to be effectively utilized.

Description

technical field [0001] The invention relates to a method for producing xylitol. More specifically, the present invention relates to a method for producing xylitol and ethanol by fermentation of corn cobs or agricultural and forestry wastes. Background technique [0002] Xylitol belongs to polyols and is a sweet substance with nutritional value. Its molecular formula is C5H12O5. It is a white crystal and is easily soluble in water and ethanol. Its sweetness is higher than that of sucrose, and it is also a normal intermediate of human carbohydrate metabolism. Xylitol widely exists in various fruits and vegetables in nature, but its content is very low. The calorific value and sweetness of commercial xylitol are similar to those of sucrose. It does not consume insulin after eating. It also has a special anti-caries function. It can be used as a nutrient and therapeutic agent for diabetics and an anti-caries food for children. Xylitol also has similar properties to glycerin. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/18C12P39/00C12R1/01C12R1/15C12R1/66C12R1/74C12R1/80C12R1/845C12R1/85
Inventor 李荣杰薛培俭邓远德
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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