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Method for preparing ethylene through disproportionation of propylene

A technology for ethylene and propylene, applied in the field of propylene disproportionation to prepare ethylene, can solve the problems of single product structure, inflexible disproportionation technology, failure to produce ethylene, etc., and achieve the effects of slowing down the coking process, prolonging stability, and suppressing side reactions

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One of the technical problems to be solved by the present invention is to provide a new disproportionation reaction process for the problems that the disproportionation technology in the prior art is not flexible enough, the product structure is single, ethylene cannot be produced, and the selectivity of the target product is low; the method When used in the reaction of propylene disproportionation to ethylene and butene, it has the advantages of rich product structure, high ethylene content of the product, and high selectivity of the target product.

Method used

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  • Method for preparing ethylene through disproportionation of propylene
  • Method for preparing ethylene through disproportionation of propylene
  • Method for preparing ethylene through disproportionation of propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 50 grams of commercial MgO, add 500 grams of deionized water, heat and stir in a water bath at 90°C for 2 hours, filter the water in the solution with suction, dry the product at 80°C for 15 hours, and roast at 450°C for 8 hours to obtain the finished isomerization catalyst .

[0045] will load tungsten oxide 10% SiO 2 Roast at 450°C for 8 hours, mix with isomerization catalyst at 1:6 (mass ratio), install in a Φ25mm fixed bed reactor, use propylene as raw material, and use propylene at a weight space velocity of 10 hours -1 , the reaction temperature was 300°C, and the reaction pressure was 3MPa to evaluate the performance of the catalyst. The results are shown in Table 1.

Embodiment 2

[0047] Weigh 50 grams of commercial MgO, add 500 grams of deionized water, heat and stir in a water bath at 90°C for 2 hours, filter the water in the solution with suction, dry the product at 80°C for 15 hours, and roast at 450°C for 8 hours to obtain the finished isomerization catalyst .

[0048] will load tungsten oxide 15% SiO 2 Roast at 450°C for 8 hours, mix with isomerization catalyst at 1:6 (mass ratio), install in a Φ25mm fixed bed reactor, use propylene as raw material, and use propylene at a weight space velocity of 10 hours -1 , the reaction temperature was 300°C, and the reaction pressure was 3MPa to evaluate the performance of the catalyst. The results are shown in Table 1.

Embodiment 3

[0050] Weigh 50 grams of commercial MgO, add 500 grams of deionized water, heat and stir in a water bath at 90°C for 2 hours, filter the water in the solution with suction, dry the product at 80°C for 15 hours, and roast at 450°C for 8 hours to obtain the finished isomerization catalyst .

[0051] The loaded tungsten oxide 5% SiO 2 Roast at 450°C for 8 hours, mix with isomerization catalyst at 1:6 (mass ratio), install in a Φ25mm fixed bed reactor, use propylene as raw material, and use propylene at a weight space velocity of 10 hours -1 , the reaction temperature was 300°C, and the reaction pressure was 3MPa to evaluate the performance of the catalyst. The results are shown in Table 1.

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Abstract

The invention relates to a method for preparing ethylene through disproportionation of propylene. In the prior art, the technology is single, is only used for the propylene preparation technology through disproportionation of ethylene and butylene, and cannot be flexibly adjusted along with the price fluctuation of the product on the market, and the catalyst is easily deactivated in the propylenedisproportionation reaction. A purpose of the present invention is mainly to solve the problems in the prior art. According to the technical scheme of the present invention, ethylene is used as a rawmaterial, the raw material and a catalyst composition are subjected to a contact reaction to obtain ethylene, and the catalyst comprises, by weight, 5-99 parts of a double decomposition catalyst and 1-95 parts of an isomerization catalyst. With the technical scheme, the problems in the prior art are well solved. With the method of the present invention, the product structure can be flexibly adjusted according to the price fluctuation of the product on the market while the device, the catalyst and the process during the adjusting remain the unchanged states, the economic cost is low, and the method can be used for the industrial production of ethylene through olefin disproportionation.

Description

technical field [0001] The invention relates to a method for preparing ethylene by disproportionation of propylene; in particular, it relates to a method for preparing ethylene by disproportionation of propylene. Background technique [0002] Olefin disproportionation is a process in which the C=C double bond in the olefin is broken and re-formed under the action of a transition metal compound catalyst to obtain a new olefin product. [0003] Olefin disproportionation technology is one of the effective technical means to adjust product structure. Using propylene as a raw material, the production of ethylene and butene by disproportionation of propylene can expand the selection of lower olefins production, and is an effective process to provide olefins with higher utilization value. Conversely, propylene can also be produced from ethylene and butene. [0004] At present, there are many patents on the production of propylene with ethylene and butene as raw materials, but the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C6/04C07C11/04C07C11/08B01J23/28B01J23/30B01J23/36B01J23/02B01J23/04B01J29/03
CPCC07C6/04B01J23/02B01J23/04B01J23/28B01J23/30B01J23/36B01J29/0341B01J2229/18B01J35/19C07C11/04C07C11/08Y02P20/52
Inventor 董静宣东王仰东宋庆英
Owner CHINA PETROLEUM & CHEM CORP
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