Process for preparing xylitol by using corn core or agriculture and forestry castoff
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A technology of agricultural and forestry waste and xylitol, which is applied in the field of xylitol production, and can solve the problem of low recovery rate of xylitol
Active Publication Date: 2008-07-16
ANHUI BBCA FERMENTATION TECH ENG RES
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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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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 xylitol production method by utilizing corn cobs or agro-forestry waste, such as, stalks, as raw materials. The method includes the pretreatment of the raw materials, the diluted acid treatment of the raw materials and the solid-liquid separation, the ingredients of obtained liquid phase are treated with decolorization, filtration, deacidification and RO concentration, then a yeast is utilized for fermentation so as to obtain a xylitol. A relatively pure xylitol liquid is obtained after the bacteria removal, the concentration and the chromatographic separation of the fermentation liquid, then a solid finished product xylitol is obtained by decolorization, ash removal, concentration, crystallization, separation and drying, and a crystal parent solution returns to the chromatographic separation. In addition, the invention carries out the pulp conditioning of solid phase components which are obtained by the solid-liquid separation after acidolysis, then the solid phase components are used for ethanol fermentation after the enzymolysis; the lignin residue which is obtained after the filtration of the products of the enzymolysis can be taken as fuel or be used for the development of the deep-processed products of the lignin. The xylitol production method of the invention can greatly reduce the cost of the industrial production of the xylitol and lead all the components of the raw materials to be utilized effectively.
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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