Method for catalyzing sugar and sugar alcohol hydrocracking reaction through nickel-based catalyst

A catalyst technology for catalyzing sugar and nickel-based catalysts, applied in the direction of heterogeneous catalyst chemical elements, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high economic cost, non-continuous production, etc., and achieve low environmental pollution , Good product quality, simple operation process

Active Publication Date: 2015-04-29
NANJING UNIV OF TECH
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  • Summary
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  • Description
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Problems solved by technology

Patent CN102731257A discloses a method for selectively producing propylene glycol from sugar-containing compounds. This techn

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] First, dissolve nickel nitrate in water to make a 3mol / L solution, then react it with ammonia water at a molar ratio of 1:1.5 to form a NiOH precipitate, then filter it, and dry it for later use. Take the dried nickel hydroxide and add γ-Al 2 o 3 Powder, the mass ratio is 1:1, mix the two evenly, add methanol, the mass ratio is 1% of the total mass, stir and knead all the substances, make it evenly mixed and then perform tablet molding. Then carry out high-temperature roasting to decompose NiOH, and the roasting temperature is 650°C. Finally, the calcined catalyst is subjected to hydrogen reduction, the hydrogen pressure is 0.2Mpa, the tail gas flow rate is 10mL / min, the temperature is programmed, the heating rate is 40°C / h, the reduction temperature is 220°C, when the temperature rises to 100°C for 4h, 180°C ℃ for 4 hours, 220 ℃ for 2 hours, the total reduction time is about 15 hours. After the pre-reduction is completed, stop heating, keep the hydrogen pressure of ...

Embodiment 2

[0029] First, nickel nitrate was dissolved in water to prepare a 2mol / L solution, and then reacted with ammonia water at a molar ratio of 1:1 to form a NiOH precipitate, which was then filtered and dried for later use. Take the dried nickel hydroxide and add γ-Al 2 o 3 Powder, the mass ratio is 1:5, mix the two evenly, add deionized water, the mass ratio is 5% of the total mass, stir and knead all the substances, make it evenly mixed and then perform tablet molding. Then carry out high-temperature roasting to decompose NiOH, and the roasting temperature is 450°C. Finally, the calcined catalyst was subjected to hydrogen reduction, the hydrogen pressure was 0.1Mpa, the exhaust gas flow rate was 5mL / min, the temperature was programmed, the heating rate was 20°C / h, and the reduction temperature was 180°C. ℃ for 1h, the total reduction time is about 10h. After the pre-reduction is completed, stop heating, keep the hydrogen pressure of the reaction system above 0.2 MPa, and store...

Embodiment 3

[0032] First, dissolve nickel nitrate in water to make a 1mol / L solution, then react it with ammonia water at a molar ratio of 1:2 to form a NiOH precipitate, then filter it, and dry it for later use. Take the dried nickel hydroxide and add γ-Al 2 o 3Powder, the mass ratio is 1:2.5, mix the two evenly, add talcum powder, the mass ratio is 2.5% of the total mass, stir and knead all the materials, make it evenly mixed and then perform tablet molding. Then carry out high-temperature roasting to decompose NiOH, and the roasting temperature is 500°C. Finally, the calcined catalyst was subjected to hydrogen reduction, the hydrogen pressure was 0.15Mpa, the exhaust gas flow rate was 7mL / min, the temperature was programmed, the heating rate was 30°C / h, and the reduction temperature was 200°C. ℃ for 4 hours, 200 ℃ for 1 hour, the total reduction time is about 20 hours. After the pre-reduction is completed, stop heating, keep the hydrogen pressure of the reaction system above 0.2 MPa...

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Abstract

The invention relates to a method for catalyzing sugar and sugar alcohol hydrocracking reaction through a nickel-based catalyst. Under the action of the nickel-based catalyst, the aqueous solution of xylose, glucose, fructose, arabinose, xylitol, sorbitol, arabitol and other carbon-rich sugar and sugar alcohol is adopted as the raw material, the raw material is subjected to the hydrogenation dehydration and decomposed into low-carbon alcohols in a highly selective manner, and the low-carbon alcohols mainly comprise ethanediol, 1,2-propylene glycol and 1,3-propylene glycol.

Description

technical field [0001] The invention relates to a method for using a nickel-based catalyst to catalyze the hydrocracking reaction of sugar and sugar alcohol, in particular to a columnar particle nickel-based catalyst and its application to the continuous hydrogenation catalytic cracking process of sugar and sugar alcohol to obtain propylene glycol and ethylene glycol alcohol. technical background [0002] Both ethylene glycol and propylene glycol are important basic organic chemical raw materials, among which ethylene glycol is mainly used in the production of polyethylene terephthalate (raw material for PET, polyester fiber and polyester plastic) and antifreeze, and can also be used in Production of synthetic resins, lubricants, surface lubricants, softeners, moisturizers, explosives, etc. Propylene glycol is an important raw material for unsaturated resins, epoxy resins, and polyurethane resins, and is widely used in industries as antifreeze, hygroscopic agents, lubricant...

Claims

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Application Information

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IPC IPC(8): C07C29/00C07C31/20B01J23/755
CPCB01J23/755B01J2523/847C07C29/00C07C31/20
Inventor 朱建良杨晓瑞刘超英徐文龙梁金花
Owner NANJING UNIV OF TECH
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