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A method for catalytic selective hydrogenation

A selective and compound technology, applied in the direction of organic chemistry methods, chemical instruments and methods, catalysts, etc., can solve the problems of reduced catalytic selectivity, long consumption time, affecting product purity, etc.

Active Publication Date: 2021-07-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the catalytic process of commercial catalysts, the catalytic selectivity to styrene will gradually decrease with the prolongation of the catalytic time, that is, the high selectivity to olefins cannot be maintained at high conversion rates.
However, the general industrial separation process takes a long time, therefore, the excessive hydrogenation product alkane produced in the separation process will greatly affect the purity of the product

Method used

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  • A method for catalytic selective hydrogenation
  • A method for catalytic selective hydrogenation
  • A method for catalytic selective hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of Metal Alloy and Metal Organic Framework Composite Catalyst

[0038] 1.1 Add 52.5 mg of copper chloride dihydrate, 125 mg of glucose, 225 mg of hexadecylamine and 25 ml of deionized water into a 50 ml single-necked flask, react at 100°C for 6 hours, centrifuge while hot, and use a 65°C deionized flask to The deionized water was centrifugally washed 5 times, and the product was dispersed into 5 milliliters of deionized water;

[0039]1.2 Take 1 ml of copper nanocube aqueous solution, disperse it into 5 ml of deionized water, add 50 mg of polyvinylpyrrolidone (Mw=55000), and stir at room temperature for 12 hours to obtain 5 ml of copper nanocube aqueous solution;

[0040] 1.3 Take 16.3-65 microliters of K 2 PdCl 4 (28mg / mL) aqueous solution was diluted to 500 microliters, and injected into 5 milliliters of copper nanocube aqueous solution at a speed of 0.25mL / min. In methanol solution, obtain copper-palladium alloy methanol dispersion;

[0041]...

Embodiment 6～9

[0054] Prepare the hydrogenation reaction of catalyst and phenylacetylene according to the method in embodiment 1, difference is: the amount of ammonia borane added in embodiment 6 is 1 mg, conversion rate and selectivity when reacting for 8 minutes.

[0055] Prepare the hydrogenation reaction of catalyst and phenylacetylene according to the method in embodiment 1, difference is: the amount of ammonia borane added in embodiment 7 is 3 mg, conversion rate and selectivity when reacting for 8 minutes.

[0056] Prepare the hydrogenation reaction of catalyst and phenylacetylene according to the method in embodiment 1, difference is: the amount of ammonia borane added in embodiment 8 is 5 mg, conversion rate and selectivity when reacting for 8 minutes.

[0057] Prepare the hydrogenation reaction of catalyst and phenylacetylene according to the method in Example 1, the difference is that the amount of ammonia borane added in Example 9 is 7 mg, the conversion rate and selectivity when ...

Embodiment 10～13

[0060] Prepare the catalyst and phenylacetylene hydrogenation reaction according to the method in Example 1, except that in Example 10, the amount of copper palladium@ZIF-8 catalyst added is 0.5 mg.

[0061] Prepare the catalyst and phenylacetylene hydrogenation reaction according to the method in Example 1, except that in Example 11, the amount of copper palladium@ZIF-8 catalyst added is 1 mg.

[0062] Prepare the catalyst and phenylacetylene hydrogenation reaction according to the method in Example 1, except that in Example 12, the amount of copper palladium@ZIF-8 catalyst added is 1.5 mg.

[0063] Prepare the catalyst and phenylacetylene hydrogenation reaction according to the method in Example 1, except that in Example 13, the amount of copper-palladium@ZIF-8 catalyst added is 2 mg.

[0064] The present invention has calculated embodiment 10~13 conversion rate and selectivity to phenylacetylene hydrogenation reaction 8 minutes, and experimental result is as follows Figur...

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Abstract

The invention provides a method for catalytic selective hydrogenation, comprising: reacting the compound and ammonia borane in a solvent under the catalysis of copper palladium @ metal organic framework composite material; the compound contains a double bond in the terminal group or triple bond compounds. This application uses copper palladium @ metal organic framework composite material to catalyze the in situ decomposition of ammonia borane, and the active hydrogen obtained from the decomposition can directly catalyze the conversion of compounds with double bonds or triple bonds in the terminal group into corresponding products, which is not prone to excessive hydrogenation question. Experimental results show that the catalytic selective hydrogenation method provided by the present application can complete the reaction within 8 minutes and the selectivity to styrene is as high as 96%.

Description

technical field [0001] The invention relates to the technical field of metal catalysts, in particular to a catalytic selective hydrogenation method. Background technique [0002] Olefins are an important class of chemical raw materials, and are also widely used synthetic monomers in the synthetic polymer industry. Take styrene as an example. At present, the annual output of styrene in the world can reach about 22 million tons, and it has a wide range of uses. Styrene can not only self-polymerize to form high-molecular polystyrene, but also easily polymerize or copolymerize with other small organic molecules, for example, polymerize or copolymerize with acrylonitrile, butadiene, etc., to prepare AS plastic or It is ABS plastic; it is copolymerized with acrylate, vinyl acetate, etc. to prepare polyester resin. These polymer materials prepared from styrene monomer can be further processed and have been widely used in daily production and life. [0003] Selective hydrogenatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07B31/00C07C5/09C07C15/46C07C29/141C07C33/30
CPCC07B31/00C07C5/09C07C29/141C07C2531/22C07C15/46C07C33/30
Inventor 江海龙李璐妍杨其浩
Owner UNIV OF SCI & TECH OF CHINA