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Method for propylene preparation through pentene disproportionation

A technology of pentene and propylene, applied in the field of pentene disproportionation to propylene, can solve the problem of low propylene selectivity and achieve the effect of improving selectivity

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of low propylene selectivity existing in the prior art, and a new method for producing propylene by disproportionation of pentene is provided

Method used

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  • Method for propylene preparation through pentene disproportionation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1 kg of γ-Al 2 O 3 Add 10 grams of Asparagus powder to the mixer and stir for 45 minutes. After kneading evenly, add 400 grams of aluminum sol and 36 grams of ammonium perrhenate, add 1 kilogram of deionized water, knead, extrude, dry, and then at 550 ° C After roasting for 4 hours, the catalyst is finished, and the content of rhenium oxide is 4%. The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device. The raw materials were pentene and ethylene. The reaction was carried out at a temperature of 80 °C, a pressure of 0.5 MPa, and a weight space velocity of pentene for 4 hours. -1 The evaluation was carried out under the conditions of , and the evaluation results are shown in Table 1, denoted as SL-1.

Embodiment 2

[0021] According to each step in embodiment 1, only change ammonium perrhenate to be 72 grams, the loading amount of the obtained catalyst rhenium oxide is 8%, and in changing reaction conditions, the reaction temperature is 60 ° C, the reaction pressure is 0.2 MPa and the weight is empty speed of 1 hour -1 , and the evaluation results are shown in Table 1, denoted as SL-2.

Embodiment 3

[0023] According to the steps in Example 1, only changing the ammonium perrhenate to 108 grams, the loading of the prepared catalyst rhenium oxide was 12%, and the reaction temperature in the changing reaction conditions was 100 ° C, the reaction pressure was 0.4 MPa and the weight was empty. speed of 2 hours -1 , the evaluation results are shown in Table 1, and it is denoted as SL-3.

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Abstract

The present invention relates to a method for propylene preparation through pentene disproportionation, wherein the problem of low propylene selectivity in the prior art is mainly solved with the present invention. The technical scheme comprises that: pentene and ethylene are adopted as raw materials, and the raw materials and a catalyst are subjected to a contact reaction in a fixed bed reactor at a reaction temperature of 20-120 DEG C under reaction pressure of 0-1 MPa (calculated as absolute pressure) at a weight space velocity of 1-20 h<-1> to produce a propylene-containing effluent, wherein the catalyst contains 1-30 parts by weight of rhenium oxide and 70-99 parts by weight of a Al2O3 carrier. With the technical scheme, the problem is well solved, and the method can be used for industrial production of propylene preparation through pentene disproportionation.

Description

technical field [0001] The invention relates to a method for preparing propylene by disproportionation of pentene. Background technique [0002] Olefin disproportionation is a conversion process of olefins. Through the cleavage and reformation of the C=C double bond in the olefin under the action of the transition metal compound catalyst, a new olefin product is obtained. Olefin disproportionation can be represented by the following formula: [0003] [0004] Using the disproportionation of pentene, the relatively excess and low value-added C 5 Olefin feedstocks are converted into high value-added propylene products, and olefin disproportionation catalysts are the key to this process. [0005] US5898091 and US6166279 report C 4 , C 5 Olefin treatment. In the process of olefin disproportionation to propylene, the catalyst used is Re 2 O 7 / Al 2 O 3 , the reactor is a moving bed. [0006] US5300718 reports the process of producing propylene by disproportionation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C6/04B01J23/36
CPCY02P20/52
Inventor 宣东王仰东洪涛
Owner CHINA PETROLEUM & CHEM CORP