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Method for producing propylene and coproducing ethylene from C4 olefins

A technology of carbon tetraolefins and low-carbon olefins, which is applied in the field of olefin disproportionation and olefin catalytic cracking coupling process to produce propylene and by-product ethylene, so as to achieve the effect of improving conversion rate and yield

Active Publication Date: 2015-02-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report of combining the two processes in the prior art

Method used

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  • Method for producing propylene and coproducing ethylene from C4 olefins
  • Method for producing propylene and coproducing ethylene from C4 olefins
  • Method for producing propylene and coproducing ethylene from C4 olefins

Examples

Experimental program
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Embodiment 1

[0070] The experimental olefin disproportionation catalyst is a tungsten-based / molybdenum-based magnesium-modified composite catalyst. Among them, the carrier SiO 2 The specific surface area is 395.3m 2 / g, the pore volume is 0.87cm 3 g -1 , the pore size is 8.66nm, the acid content is 0.41mmolNH 3 g -1 ; The active component is supported by the equal volume impregnation method, and the active component WO in the catalyst 3 The mass content is 8%, MoO 3 The mass content is 5%, and the magnesium oxide content is 6%.

[0071] Phosphorous modified ZSM-5 molecular sieve is selected as the catalyst for olefin cracking, which is the combination of ZSM-5 molecular sieve and SiO 2 、Al 2 o 3 After mechanical mixing, adding binder, pressing into tablets and roasting, and then modifying the molded catalyst with phosphorus by an equal volume impregnation method to prepare it, wherein the phosphorus content is 2%. The phosphorus modified ZSM-5 molecular sieve has a specific surfa...

Embodiment 2

[0076] Compared with the process of Example 1, the present embodiment differs in that the C4-olefin raw material is passed into the light olefin disproportionation reaction device with a volume flow rate of 5ml / h, and the cracking reaction temperature in the olefin catalytic cracking device is controlled to be 500°C. Other processing conditions are with embodiment 1. Gas chromatography analysis of reaction products. For analysis results, see Image 6 .

Embodiment 3

[0078] Compared with the process of Example 1, the present embodiment differs in that the carbon tetraolefin raw material is passed into the light olefin disproportionation reaction device with a volume flow rate of 5ml / h, and the disproportionation and cracking reaction catalyst filling ratio is 3:2, and Control the disproportionation reaction temperature of low-carbon olefins to 320°C, and the weight hourly space velocity to 6h -1 , the reaction pressure is 0.6MPa; all the other process conditions are the same as in Example 1. Gas chromatography analysis of reaction products. For analysis results, see Figure 7 .

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Abstract

The invention provides a method for producing propylene and coproducing ethylene from C4 olefins, which comprises the following steps: filling the mixture of an olefin disproportionation catalyst and a catalytic cracking catalyst in one reactor or sectionally filling the olefin disproportionation catalyst and catalytic cracking catalyst in differential reactors which are connected in series, and passing a C4 olefin raw material through the olefin disproportionation catalyst and catalytic cracking catalyst to carry out C4 olefin disproportionation reaction and low-carbon olefin cracking reaction, thereby generating the propylene and ethylene. The method couples a low-carbon olefin disproportionation technique with a low-carbon olefin deep catalytic cracking technique, and adopts an appropriate combination mode for the olefin disproportionation catalyst and olefin cracking catalyst, thereby achieving the goal of enhancing the yields of the propylene and ethylene.

Description

technical field [0001] The present invention relates to a method for producing propylene by-product ethylene by using C4-alkene as raw material, in particular, it relates to a method of using C4-alkene as raw material and adopting a coupled process of olefin disproportionation and olefin catalytic cracking to produce propylene and by-product ethylene Methods. Background technique [0002] Propylene is one of the most important organic chemical raw materials next to ethylene, and it is mainly used to produce polypropylene, acrylonitrile and acrylic acid. Affected by the increasing demand for propylene derivatives, the global demand for propylene is increasing year by year. The latest research report of CMAI pointed out that the average annual growth rate of global propylene demand is about 5.2%, and the market demand is strong (Liu Xiaobo, Wang Dingbo, Ma Zhiyuan, etc. Research on the production of propylene and ethylene from carbon pentaolefins [J]. Petrochemical, 2005.34( ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C6/04C07C11/06C07C11/04
CPCC07C4/06C07C6/04C07C11/06C07C11/04
Inventor 袁桂梅薛扬张耀亨李淑娟吴韬陈胜利
Owner BC P INC CHINA NAT PETROLEUM CORP
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