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Method for directly preparing xylitol from hemicellulose

A technology of hemicellulose and xylitol, applied in chemical instruments and methods, preparation of hydroxyl compounds, organic compounds, etc., can solve the problems of low yield of xylitol, easy to corrode equipment, difficult to recycle, etc., and achieve the goal of preparing The method is simple, the cost is low, and the effect of high yield

Active Publication Date: 2019-06-14
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The preparation method is simple in technology and friendly to the environment, but the precious metal catalyst is expensive, and the catalyst is dispersed in the solution, and the catalyst recovery is easy to lose in the industrial scale application, and the use of inorganic acid as the hydrolysis catalyst (US9586878B2) is easy to corrode the equipment, difficult to recycle, wood Relatively low sugar alcohol yield

Method used

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  • Method for directly preparing xylitol from hemicellulose
  • Method for directly preparing xylitol from hemicellulose

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preparation example Construction

[0024] The preparation method of the magnetic solid acid catalyst in following embodiment comprises:

[0025] (1) Roast HZSM-5 in a muffle furnace at 500°C for 4 hours, grind it through a 100-mesh sieve, then immerse it in a 1.0mol / L phosphoric acid solution with deionized water as the solvent for 2 hours, and then dry it at 105-110°C 12-18h, put it in a muffle furnace at 500°C and bake for 4h again to obtain the carrier;

[0026] (2) Dissolve the precursor of the active metal in deionized water and pour it into the above-mentioned carrier, soak it for 12-15 hours, then dry it in a blast drying oven at 105-112°C for 12-18 hours, and then heat it at 500°C Roast in a furnace for 3-5 hours, grind through a 100-mesh sieve, pass hydrogen into a reduction furnace at 500°C for reduction for 3-5 hours, and obtain the magnetic solid acid catalyst. The above-mentioned active metal is composed of Ni, Fe and Zr , or composed of Ni and Fe.

[0027] The recovery method of the magnetic sol...

Embodiment 1-5

[0029] 0.5g corncob hemicellulose, 50g deionized water, 0.1g magnetic solid acid catalyst (the total load of active metal is 60wt%, and the molar ratio of active metal Ni, Fe, Zr is 10:1:1.8) joins in In a 100mL autoclave, replace the air in the ax with hydrogen, pass in 3MPa hydrogen, seal the autoclave, stir at 600rpm, heat to 180°C and keep it for 1-5h, finish the reaction and cool at room temperature, magnetically separate the solid and liquid, and take the supernatant solution, prepare xylitol standard solution, use high performance liquid chromatography to carry out qualitative and quantitative detection, and the detection results are listed in Table 1, serial number is 1-5.

Embodiment 6-8

[0031] 0.5g corncob hemicellulose, 50g deionized water, 0.1g magnetic solid acid catalyst (the total load of active metal is 60wt%, and the molar ratio of active metal Ni, Fe, Zr is 10:1:1.8) joins in In a 100mL autoclave, replace the air in the ax with hydrogen, pass in 3MPa hydrogen, seal the autoclave, stir at a speed of 600rpm, heat to 170-200°C and keep for 4h, finish the reaction and cool at room temperature, magnetically separate the solid and liquid, and take the supernatant solution, prepare xylitol standard solution, use high performance liquid chromatography to carry out qualitative and quantitative detection, the detection results are listed in Table 1, serial number is 6-8.

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Abstract

The invention discloses a method for directly preparing xylitol from hemicellulose. The preparation method comprises the following steps: mixing biomass hemicellulose, a magnetic solid acid catalyst and deionized water, carrying out a sealed reaction at 170-200 DEG C for 1-5 hours in a hydrogen atmosphere of 1-4 MPa and at a stirring rate of 500-700 rpm, and conducting cooling to room temperatureto obtain the xylitol. After being magnetically separated and dried, the magnetic solid acid catalyst is used for a next reaction. The yield of the xylitol is high, and byproducts and excessive hydrogenolysis products cannot appear in the hydrolysis and hydrogenation processes with the used magnetic solid acid catalyst.

Description

technical field [0001] The invention belongs to the technical field of xylitol preparation, in particular to a method for directly preparing xylitol from hemicellulose. Background technique [0002] Xylitol is a five-carbon sugar alcohol, a sugar-free sweetener that can be eaten by diabetics, and is also an important raw material for the production of toothpaste and chewing gum, lactic acid, ethylene glycol and propylene glycol. It is used in medical, food and chemical industries have important uses. [0003] At present, the commonly used xylitol production methods include biosynthesis and chemical hydrogenation after hydrolysis. Disclosed a kind of preparation method of xylitol as CN101643753B, will inoculate the fermented medium that contains xylose hydrolyzate through the cultured xylitol yeast strain, carry out aerobic, micro-oxygen two stage combined fermentation, promptly obtain xylitol sugar alcohol. Although this method is simple and environmentally friendly, it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/141C07C31/18B01J29/46B01J37/08B01J37/18B01J37/02
Inventor 曾宪海张良清唐兴孙勇林鹿
Owner XIAMEN UNIV
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