Method for hydrocracking glycyl alcohol

A technology for hydrocracking and glycerol, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, organic chemistry, etc. problem, to achieve the effect of high catalytic activity, low price and mild reaction conditions

Inactive Publication Date: 2009-02-25
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

Although these synthetic routes are mature, there are the following limitations: (1) This technical route uses strategic resources such as ethylene and propylene as raw materials, and the production of products depends on petroleum resources
(2) During the production process, through selective epoxidation, hydration and other catalytic processes, the technical difficulty is relatively large, the route is long, and the efficiency is low
[0006] In the above documents and patents, the conversion rate of glycerol is not more than 70%, the yield of 1,2-propanediol is not more than 40%, and the selectivity is not high

Method used

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  • Method for hydrocracking glycyl alcohol
  • Method for hydrocracking glycyl alcohol
  • Method for hydrocracking glycyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the preparation of catalyst

[0028] For preparing catalyst of the present invention, carrier adopts coconut shell activated carbon, and its characteristics are as follows:

[0029] Specific surface: 1306.80m 2 / g; average pore size: 2.4nm; particle size: 80-100 mesh and dry before use.

[0030] Dissolve the soluble metal salt solution in water to prepare the impregnation solution with the required concentration, impregnate it into the carrier, keep it for 24 hours, and then dry it at a constant temperature of 120°C to make single-component or double-component with different loads and components Sub-supported metal catalysts (Table 1 is the prepared catalysts of different metal components). Then, by KBH 4 Reduction prepared into an amorphous catalyst.

[0031] Specifically as the preparation of No. 1 catalyst: take by weighing the solution of nickel nitrate and cerium nitrate (Ni: Ce=8: 1, mass ratio), add the activated carbon after drying (the loading...

Embodiment 2-10

[0034] The activity evaluation of embodiment 2-10 catalyst

[0035] The following examples adopt the following general method to prepare low-carbon diols by hydrocracking glycerol with the catalyst of Example 1.

[0036] The catalytic hydrocracking performance evaluation of glycerol was carried out in a 600ml autoclave, the raw material was 150g of 25% mass concentration glycerol aqueous solution, and the amount of catalyst before reduction was 7g. The hydrogen pressure is 5MPa, the reaction temperature is 200°C, and the reaction time is 6h.

[0037] The reaction products were analyzed by gas chromatography.

[0038] The transformation rate of glycerol adopts following formula to calculate:

[0039]

[0040] The selectivity of the product is calculated using the following formula:

[0041]

[0042] Table 3 Effect of catalysts with different compositions on the hydrocracking performance of glycerol

[0043]

[0044] Influence of different proportions of components ...

Embodiment 18-20

[0052] Embodiment 18-20 Effect of reaction time on glycerol hydrocracking performance

[0053] The influence of different time periods on the hydrocracking performance of glycerol was studied. The catalyst number was 8. Other reaction processes were the same as in Examples 2-7. The test results were as follows.

[0054] Table 8 Effect of different reaction time on the hydrocracking performance of glycerol

[0055]

[0056] Embodiment 21-22 Effect of reaction temperature on glycerol hydrocracking performance

[0057] The influence of different temperatures on the hydrocracking performance of glycerol was studied. The reaction time was 8 hours, the catalyst number was 8, and other reaction processes were the same as in Examples 2-7. The test results are as follows.

[0058] Table 9 Effects of different reaction temperatures on glycerol cracking

[0059]

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Abstract

The invention relates to a catalyst for glycerin hydrocracking. The catalyst is a supported amorphous catalyst with two functions, high catalytic activity, mild reaction conditions, pollution-free, and clean and environment-friendly reaction process. Under the catalysis of the catalyst, the glycerin is hydrocracked to generate ethylene glycol and 1, 2-propylene glycol with the conversion of more than 95%; and the overall selectivity of the ethylene glycol and the 1, 2-propylene glycol is more than 85%.

Description

technical field [0001] The invention relates to glycerol hydrocracking, in particular to a method for generating ethylene glycol and 1,2-propanediol by hydrocracking glycerol. Background technique [0002] Glycerol is a by-product produced in the process of preparing biodiesel, and it is generated in a relatively large amount, so it is urgent to find new high value-added applications for it. [0003] Low-carbon diols such as ethylene glycol and propylene glycol (including 1,2-propanediol and 1,3-propanediol) are important energy liquid fuels, and are also very important polyester synthetic raw materials for the synthesis of polyterephthalic acid. Ethylene glycol can also be used as antifreeze, lubricant, plasticizer, surfactant, etc., and is widely used in organic synthesis. For a long time, the production of ethylene glycol and propylene glycol has mainly been based on the technical route of using petroleum resources as raw materials, that is, using ethylene or propylene a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/60C07C29/56B01J23/83B01J23/80B01J23/78B01J23/755
CPCY02P20/52
Inventor 徐杰于维强苗虹赵静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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