Method for hydrocracking polyols

A technology for hydrogenolysis of alcohols and polyols, which is applied in the field of hydrogenolysis of polyols and can solve problems such as difficult separation

Active Publication Date: 2016-06-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These basic additives are all soluble in water or partially soluble in water, and are difficult to separate from ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A 0.35wt% nickel nitrate solution was prepared, and the required amount of activated carbon was added based on the metal loading as 10wt%. After stirring evenly, let it stand for 24 hours, then bake it in an oven at 110°C for 12 hours, and then use H in a quartz tube 2 Restore 3h.

Embodiment 2

[0025] The preparation process of catalysts 2-12 was carried out by the method of Example 1, except that the metal components (containing one or two types), mass ratio or carrier were changed. See Table 1 for details.

[0026] Table 1 Catalyst list

[0027] serial number

Embodiment 3

[0028] Embodiment 3: the catalytic hydrocracking reaction of sorbitol

[0029] Transfer the 20wt% sorbitol solution to the autoclave, then add 5wt% sorbitol solution catalyst and 10wt% cerium hydroxide. with H 2 Replace 5 times, then fill with 40barH 2 , heated to 250 ° C, the reaction 4h. After the reaction, samples were taken for gas phase and liquid phase analysis, and the results are shown in Table 2.

[0030] Catalytic hydrocracking reaction of table 2 sorbitol

[0031] Catalyst number

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PUM

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Abstract

The invention relates to a method for preparing lower alcohols through catalytically hydrocracking polyols, including sorbitol, mannitol, arabitol, xylitol, butantetraol, erythritol and glycerol, by taking insoluble hydroxides as additives. The method comprises the step of catalytically hydrocracking the polyols, which serve as a raw material, in an aqueous solution at the temperature of 150 DEG C to 320 DEG C and the H2 pressure of 1MPa to 20MPa in a manner of taking one or more than two of transition metals such as platinum, ruthenium, palladium, rhodium, nickel, copper, manganese and tungsten as catalyst active ingredients and taking the insoluble hydroxides such as cobalt hydroxide, aluminum hydroxide, iron hydroxide, cerium hydroxide, lanthanum hydroxide and yttrium hydroxide as adjuvants, so as to prepare the lower alcohols such as ethylene glycol and propylene glycol. The method has the advantages that the hydrocracking of the polyols is achieved by adding the insoluble hydroxides as the adjuvants, and the insoluble hydroxides are insoluble in water and are easy in separation; and after a reaction ends, a reaction system is not required to be neutralized by using additional acids.

Description

technical field [0001] The invention relates to the field of chemistry and chemical engineering, in particular to a method for hydrogenolysis of polyhydric alcohols. Background technique [0002] Low-carbon alcohols such as ethylene glycol and propylene glycol have a wide range of uses, such as antifreeze, lubricating oil, surfactants and adhesives, etc., especially as monomers for synthetic polyesters such as polyester fibers and polyester resins . However, ethylene glycol and propylene glycol are currently prepared based on petroleum routes, and their preparation routes are obtained through multi-step reactions such as epoxidation and hydration of ethylene and propylene. Petroleum resources are non-renewable and have limited reserves, so it is necessary to develop new preparation methods. Biomass resources are renewable, environmentally friendly and have abundant reserves. A large number of biomass-based polyols can be obtained from biomass resources, such as sorbitol, ...

Claims

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Application Information

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IPC IPC(8): C07C29/60C07C31/20
Inventor 徐杰张俊杰路芳蔡嘉莹陈佳志于维强苗虹高进
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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