Catalyst for preparing butadiene through selective hydrogenation of C4 alkyne, preparation method and applications thereof

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 high loss of diolefins and low catalytic activity , low content of precious metal palladium, etc.

Active Publication Date: 2020-02-21
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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  • Catalyst for preparing butadiene through selective hydrogenation of C4 alkyne, preparation method and applications thereof
  • Catalyst for preparing butadiene through selective hydrogenation of C4 alkyne, preparation method and applications thereof
  • Catalyst for preparing butadiene through selective hydrogenation of C4 alkyne, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1. Catalyst preparation

[0062] 1) ZrO 2 / CdO / Bi 2 o 3 Composite carrier preparation

[0063] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate respectively, and add them to 200mL deionized water to dissolve evenly. 0.04mol / L. Co-precipitate zirconium nitrate, cadmium acetate, bismuth nitrate and ammonia water (1.5mol / L) to prepare the carrier precursor. The metal salt solution and ammonia water are added dropwise. During the co-precipitation process, the pH value of the solution is kept at about 5.0. After the reaction is exhausted, the precipitate is filtered, and the filter cake is washed with deionized water to neutrality, dried at 60-80° C., and crushed to 100 mesh to obtain a carrier precursor.

[0064] Weigh 240g of the carrier precursor, 6.00g of scallop powder, 50.00g of citric acid monohydrate, add 18.00g of polyvinyl alcohol aqueous solution (mass concentration is 5%) after mixing, add water 130mL, after e...

Embodiment 2

[0073] 1. Catalyst preparation

[0074] 1) ZrO 2 / CdO / Bi 2 o 3 Composite carrier preparation

[0075] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate respectively, and add them to 200mL deionized water to dissolve evenly. 0.03mol / L. Co-precipitate zirconium nitrate, cadmium acetate, bismuth nitrate and ammonia water (2.0mol / L) to prepare the carrier precursor. The metal salt solution and ammonia water are added dropwise. During the co-precipitation process, the pH value of the solution is kept at about 6.0. After the reaction is exhausted, the precipitate is filtered, and the filter cake is washed with deionized water to neutrality, dried at 60-80° C., and crushed to 100 mesh to obtain a carrier precursor.

[0076] Weigh 240g of the carrier precursor, 6.00g of scallop powder, 50.00g of citric acid monohydrate, add 18.00g of polyvinyl alcohol aqueous solution (mass concentration is 5%) after mixing, add water 130mL, after e...

Embodiment 3

[0084] 1. Catalyst preparation

[0085] 1) ZrO 2 / CdO / Bi 2 o 3 Composite carrier preparation

[0086] Weigh zirconium nitrate pentahydrate, cadmium acetate dihydrate, and bismuth nitrate pentahydrate respectively, and add them into 200mL deionized water to dissolve evenly. 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 solution and ammonia water are added dropwise, and the pH value of the solution is kept at 3.0 during the co-precipitation process Left and right, react until the raw materials are exhausted, filter the precipitate after the reaction is completed, wash the filter cake with deionized water until it is neutral, dry it at 60-80°C, and grind it to 100 mesh to obtain the carrier precursor.

[0087] Weigh 240g of the carrier precursor, 6.00g of scallop powder, 50.00g of citric acid monohydrate, add 18.00g of polyvinyl alcohol aqueous solution (mass concentrat...

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Abstract

The invention relates to a catalyst for preparing butadiene through selective hydrogenation of C4 alkyne, a preparation method and applications thereof, wherein the catalyst comprises a ZrO2 / CdO / Bi2O3composite carrier and an active component, and the active component comprises: Pd or an oxide thereof, at least one selected from a VIIB metal or an oxide thereof, and La or an oxide thereof. According to the invention, the catalyst can be applied to selective hydrogenation of C4 alkyne to recover butadiene, and mainly solves the problems of poor stability, short service life, poor alkyne selectivity and overhigh butadiene loss of the catalyst in the prior art.

Description

technical field [0001] The invention relates to a catalyst for preparing butadiene by selective hydrogenation of carbon tetraacetylenes, and its application belongs to the field of petrochemical technology, more specifically, it is the selective hydrogenation of carbon tetraacetylenes contained in the material after the extraction of butadiene equipment Catalyst for preparing butadiene, preparation method and application. Background technique [0002] In addition to dienes, ethylene cracking gas also contains a large amount of C4 hydrocarbons and pyrolysis gasoline. The cracked gas will separate the carbon four components in the separation process of the ethylene unit, and then enter the butadiene unit for deep separation of the carbon four raw materials. In addition to butadiene and 1-butene, the C4 raw material also contains isobutane, n-butane, isobutene, vinyl acetylene, and butyne. After secondary extraction, the butadiene will be However, the alkyne substances in it ...

Claims

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Application Information

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Patent Type & Authority Applications(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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