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Selective hydrogenation method for phenylacetylene in the presence of phenylethylene

A technology for selective hydrogenation and styrene, applied in chemical instruments and methods, hydrogenation of hydrocarbons, hydrocarbons, etc., can solve the problem of high loss rate of styrene

Active Publication Date: 2009-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the high loss rate of styrene in the selective hydrogenation of phenylacetylene under the presence of styrene in the prior art, and a new method for the selective hydrogenation of phenylacetylene under the presence of styrene is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use θ alumina as a carrier, prepare 10 grams of nickel catalyst precursor with a loading capacity of 13% by the loading method, and activate the nickel catalyst with hydrogen at a temperature of 400 ° C for 4 hours before use, and use styrene at 100 ° C under normal pressure Next, the nickel catalyst was pre-deposited carbon for 4 hours, and the amount of carbon deposited was 0.08% after measurement. In terms of weight percent, the carbon eight fraction containing 40% styrene, 10% ethylbenzene, and 0.1% phenylacetylene was used as a raw material. At the reaction temperature at 40°C with a gravimetric space velocity of 2 hours -1 , the molar ratio of hydrogen / alkyne is 3:1, and the reaction pressure is 0.5MPa, the raw material is contacted with the catalyst after pre-coking by using a fixed bed reactor, and the reaction is carried out. The reaction result is: the loss rate of styrene is 0.1%, the content of phenylacetylene in the reaction effluent is 1ppm.

Embodiment 2

[0017] Use θ alumina as a carrier, prepare 10 grams of nickel catalyst precursors with a loading capacity of 45% by the loading method, activate with hydrogen at a temperature of 400 ° C for 4 hours before use, and adopt the same reaction conditions as in Example 1 to obtain a carbon deposition amount of 1% pre-deposited carbon catalyst, by weight percent, with the carbon eight fraction containing 35% styrene, 12% ethylbenzene, 0.2% phenylacetylene as raw material, the reaction temperature is 35 ° C, and the weight space velocity is 0.2 hours -1 , the molar ratio of hydrogen / alkyne is 10:1, and the reaction pressure is 2.5MPa, the raw material is contacted with the catalyst after pre-coking by using a fixed bed reactor, and the reaction is carried out. The reaction result is: the loss rate of styrene is 0, phenylacetylene cannot be detected in the reaction effluent.

Embodiment 3

[0019] Use γ-alumina as a carrier, prepare 10 grams of nickel catalyst precursors with a loading capacity of 20% by the loading method, activate with hydrogen at a temperature of 400 ° C for 4 hours before use, and use the same reaction conditions as in Example 1 to obtain a carbon deposition amount of 3% pre-deposited carbon catalyst, by weight percentage, with the carbon eight fraction containing 20% ​​styrene, 15% ethylbenzene, 0.06% phenylacetylene as raw material, the reaction temperature is 70 ° C, and the weight space velocity is 20 hours -1 , the molar ratio of hydrogen / alkyne is 3:1, and the reaction pressure is 0.5MPa, the raw material is contacted with the catalyst after pre-coking by using a fixed bed reactor, and the reaction is carried out. The reaction result is: the loss rate of styrene is 0.1%, the content of phenylacetylene in the reaction effluent is 5ppm.

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Abstract

The invention relates to a method for selective hydrogenation of phenylacetylene in the presence of styrene, which mainly solves the problem of high loss rate of the styrene in the prior art. The method adopts a technical proposal that hydrocarbon fractions containing the phenylacetylene are taken as raw materials, the raw materials are contacted with carbonic oxide catalyst under the condition that the reaction temperature is between 15 and 100 DEG C, the weight space velocity is between 0.01 and 100 h, the mol ratio of hydrogen to the phenylacetylene is 1-30:1, and the reaction pressure is between -0.08 and 5.0 MPa, the phenylacetylene in reaction effluent is hydrogenated into styrene, wherein carbon content in the carbonic oxide catalyst is between 0.02 and 8 in percentage by weight. The method better solves the problem, and can be applied in industrial production for removing the phenylacetylene by hydrogenation in the presence of the styrene.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of phenylacetylene in the presence of styrene, in particular to a method for removing phenylacetylene by using C8 hydrocarbon fractions containing phenylacetylene as raw materials. Background technique [0002] Styrene (ST) is an important monomer for the production of polystyrene (PS), ABS resin and styrene-butadiene rubber. Its production method is mainly based on ethylbenzene dehydrogenation. In recent years, with the development of the ethylene industry and the increase in scale, the technology of extracting and recovering styrene from pyrolysis gasoline has become one of the technologies for increasing the production of styrene that has attracted much attention. [0003] Pyrolysis gasoline is a by-product of the ethylene industry. The output is about 60% to 70% of the ethylene production capacity. The C8 fraction is rich in styrene and mixed xylene. A set of 1000kt / a ethylene plant can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C7/167
CPCB01J21/04B01J23/892C07C7/167B01J29/46B01J37/084B01J23/755B01J23/44C07C15/46C07C5/09
Inventor 李斯琴刘俊涛孙凤侠王万民程远琳
Owner CHINA PETROLEUM & CHEM CORP
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