Method for preparing propylene through ethylene/butylene disproportionation reaction

A technology of disproportionation reaction and ethylene, which is used in the fields of metathesis reaction to produce hydrocarbons, chemical recovery, organic chemistry, etc. It can solve the problems of easy deactivation of catalysts, harsh operating conditions and harsh regeneration conditions, and achieve the conversion rate and selectivity of the reaction. Good, mild process conditions, simple process effect

Active Publication Date: 2012-12-19
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

[0009] The catalytic system in the existing ethylene / butene disproportionation reaction technology for producing propylene is a heterogeneous catalytic system, which requires relatively strict operating conditions (such as high reaction temperature or high reaction pressure, etc.), strict requirements on raw materials, and the catalyst is extremely easy to Deactivation, repeated regeneration operations are required, and the regeneration conditions are relatively harsh. The present invention proposes to use a ruthenium-based metal carbene type homogeneous catalytic system for the ethylene / butene disproportionation reaction, providing a new optional method for the manufacture of propylene

Method used

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  • Method for preparing propylene through ethylene/butylene disproportionation reaction
  • Method for preparing propylene through ethylene/butylene disproportionation reaction

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Embodiment 1

[0024] In the autoclave, a batch operation mode is adopted to replace the reaction system with high-purity nitrogen; under nitrogen protection, add the cooled catalyst solution (di-cyclohexylphosphine-benzylidene-ruthenium dichloride / ethylene dichloride solution ) 15ml and 2-butene 1.3g; start stirring and heat up to 20°C; after stabilization, fill with ethylene so that the molar ratio of ethylene / 2-butene is 3:1, and the reaction pressure is 1.09MPa. The reaction starts timing. No additional ethylene was added during the reaction. Gas phase samples were taken intermittently for GC analysis to monitor the progress of the reaction. The reaction was stopped after 60 min. GC analysis was performed on gas and liquid phase reaction products. The conversion rate in terms of 2-butene was 73.2%, and the propylene selectivity was 99.1%.

Embodiment 2

[0026] In the autoclave, a batch operation mode is adopted to replace the reaction system with high-purity nitrogen; under nitrogen protection, add the cooled catalyst solution (di-cyclohexylphosphine-benzylidene-ruthenium dichloride / ethylene dichloride solution ) 15ml and 2-butene 1.3g; start stirring and heat up to 35°C; after stabilization, fill with ethylene so that the molar ratio of ethylene / 2-butene is 3:1, and the reaction pressure is 1.09MPa. The reaction starts timing. No additional ethylene was added during the reaction. Gas phase samples were taken intermittently for GC analysis to monitor the progress of the reaction. The reaction was stopped after 30 min. GC analysis was performed on gas and liquid phase reaction products. The conversion rate in terms of 2-butene was 70.8%, and the propylene selectivity was 98.4%.

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Abstract

The invention discloses a method for preparing propylene through an ethylene / butylene disproportionation reaction. The method is characterized in that ethylene and 2-butylene contact with a carbene catalyst solution containing metallic ruthenium or osmium to generate propylene; and especially, ethylene and 2-butylene contact with the carbene catalyst solution containing metallic ruthenium or osmium under conditions comprising that the temperature is 0-50DEG C and the pressure is 0.1-10MPa to generate propylene, wherein the molar ratio of ethylene to 2-butylene is 1:1-10:1. The method has the advantages of simple process, mild technological condition, high reaction conversion rate, high reaction selectivity, no need of the regeneration of the catalyst, and the like.

Description

technical field [0001] The invention relates to a method for producing propylene by ethylene / butene disproportionation reaction, in particular to a method for producing propylene by ethylene / butene disproportionation reaction catalyzed by a carbene catalyst containing metal ruthenium or osmium. Background technique [0002] Olefin disproportionation reaction, also known as olefin metathesis reaction or olefin metathesis reaction, refers to the process in which carbon-carbon double bonds are broken and recombined to form new olefins in the presence of transition metal complexes. The disproportionation reaction of ethylene and 2-butene can produce propylene. The advantage of the olefin disproportionation process is that this type of technology can be combined with the traditional steam cracking process, catalytic cracking process and various other propylene production enhancement technologies except propane dehydrogenation process, without major modification of the existing pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C6/04
CPCY02P20/52Y02P20/584
Inventor 冯静郭浩然朱丽琴王红红陈和包天舒解娜袁浩王蕴林
Owner CHINA PETROLEUM & CHEM CORP
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