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A kind of carbon tetrayne selective hydrogenation to butadiene catalyst and preparation method and application

A technology for selective hydrogenation and production of butadiene, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low hydrogenation selectivity, noble metal Low palladium content, high loss of diolefins, etc., to achieve good catalytic activity, improved selectivity, and strong anti-coking performance

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is to provide a carbon tetrakyne in view of the problems that the existing catalysts have low hydrogenation selectivity to carbon tetrakynes in butene raw materials, large loss of diolefins, and low catalytic activity. Catalyst for preparing butadiene by selective hydrogenation and its preparation method. The catalyst is characterized by low noble metal palladium content, high hydrogenation selectivity to carbon tetraacetylene, and high reactivity and stability.

Method used

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  • A kind of carbon tetrayne selective hydrogenation to butadiene catalyst and preparation method and application
  • A kind of carbon tetrayne selective hydrogenation to butadiene catalyst and preparation method and application
  • A kind of carbon tetrayne selective hydrogenation to butadiene catalyst and preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1. Catalyst preparation

[0062] 1) ZrO 2 / CdO / Bi 2 O 3 Preparation of composite carrier

[0063] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate respectively, add them to 200 mL of deionized water and dissolve them evenly. 0.04mol / L. The carrier precursor is prepared by co-precipitating zirconium nitrate, cadmium acetate, bismuth nitrate and ammonia water (1.5mol / L). The metal salt aqueous solution and ammonia water are added dropwise. During the co-precipitation process, the pH value of the solution is maintained at about 5.0, and the reaction is carried out to the raw material. Exhausted, after the reaction is completed, the precipitate is filtered, and the filter cake is washed with deionized water until neutral, dried at 60-80° C., and pulverized to 100 mesh to obtain a carrier precursor.

[0064] Weigh 240g of carrier precursor, 6.00g of saffron powder, 50.00g of citric acid monohydrate, add 18.00g of polyviny...

Embodiment 2

[0073] 1. Catalyst preparation

[0074] 1) ZrO 2 / CdO / Bi 2 O 3 Preparation of composite carrier

[0075] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate, respectively, add them to 200 mL of deionized water to dissolve evenly, and the prepared concentrations are respectively zirconium nitrate concentration of 3.79 mol / L, cadmium acetate concentration of 0.04 mol / L, and bismuth nitrate concentration. 0.03mol / L. The carrier precursor is prepared by co-precipitating zirconium nitrate, cadmium acetate, bismuth nitrate and ammonia water (2.0mol / L). The metal salt aqueous solution and ammonia water are added dropwise. During the co-precipitation process, the pH value of the solution is maintained at about 6.0, and the reaction is carried out to the raw material. Exhausted, after the reaction is completed, the precipitate is filtered, and the filter cake is washed with deionized water until neutral, dried at 60-80° C., and pulveriz...

Embodiment 3

[0084] 1. Catalyst preparation

[0085] 1) ZrO 2 / CdO / Bi 2 O 3 Preparation of composite carrier

[0086] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate respectively, add them to 200 mL of deionized water to dissolve uniformly, and prepare the concentrations respectively as zirconium nitrate concentration of 3.63 mol / L, cadmium acetate concentration of 0.17 mol / L, and bismuth nitrate concentration. 0.04mol / L, co-precipitate zirconium nitrate, cadmium acetate, bismuth nitrate and ammonia water (3.0mol / L) to prepare the carrier precursor. The metal salt aqueous solution and ammonia water are added dropwise, and the pH value of the solution is kept at 3.0 during the co-precipitation process. After the reaction is completed, the precipitate is filtered, and the filter cake is washed with deionized water until neutral, dried at 60-80 ° C, and pulverized to 100 mesh to obtain a carrier precursor.

[0087] Weigh 240g of carrier prec...

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Abstract

The invention relates to a catalyst for preparing butadiene by selective hydrogenation of carbon tetrayne and a preparation method and application. The catalyst includes ZrO 2 / CdO / Bi 2 O 3 A composite carrier and an active component, the active component consists of: at least one of Pd or its oxide, VIIB metal or its oxide, La or its oxide. The catalyst of the invention can be used in the application of the selective hydrogenation of carbon tetraacetylene to recover butadiene, and mainly solves the problems of poor catalyst stability, short life, poor alkyne selectivity and excessive butadiene loss in the prior art.

Description

technical field [0001] The invention relates to a catalyst for producing butadiene by selective hydrogenation of carbon tetrayne, and its application belongs to the technical field of petrochemical industry. Catalyst for preparing butadiene, preparation method and application. Background technique [0002] In addition to diene, ethylene cracking gas also contains a large amount of C4 hydrocarbons and pyrolysis gasoline. In the separation process of the ethylene unit, the cracked gas will separate the C4 components, and then enter the butadiene unit for deep separation of the C4 raw materials. In addition to butadiene and 1-butene, the C4 raw material also contains isobutane, n-butane, isobutene, vinyl acetylene, and butyne and other substances. It is separated out, but the alkynes in it will gradually enrich in the butadiene material, and the butadiene device will generally extract the alkyne-rich material through the side line in the lower column of the second extraction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/644B01J35/10C07C5/09C07C11/167
CPCB01J23/6447B01J35/1004B01J35/0066C07C5/09C07C11/167Y02P20/584
Inventor 王兰磊白长城刘保军王江孔祥明张小锋国欣徐艳飞梁健张宏科
Owner WANHUA CHEM GRP CO LTD
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