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Method for producing propen of C4 and its above colefines catalytic cracking

A technology of catalytic cracking and olefins, applied in the direction of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., can solve the problems of low yield of the target product propylene, only suitable for artificial preparation, etc., to improve yield, suppress hydrogen transfer reaction, and good technical effect Effect

Inactive Publication Date: 2004-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects in the previous literature that the yield of the target product propylene is low, and the raw materials used are only suitable for artificial preparation, and provide a new method for producing propylene by catalytic cracking of olefins with carbon four and above

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0013] The reaction temperature has a significant impact on the reaction of olefin catalytic cracking to produce propylene. Generally speaking, the reaction temperature is beneficial to the formation of the reaction product propylene.

[0014] 5 grams of commercial silicon-aluminum ratio (molar ratio) is the ZSM-5 molecular sieve of 50, is placed in 200 milliliters, 5% by weight NH 4 NO 3 In the solution, exchange at a temperature of 85-90°C for 2 hours, and repeat 3 times. After the exchange, the hydrogen-type ZSM-5 molecular sieve was obtained by washing and drying at 120°C. 5 grams of hydrogen-type ZSM-5 molecular sieves were mixed with 5 milliliters of silica sol, and then extruded. After drying at 120°C and calcining at 400°C, the HZ-50 catalyst was obtained. Before the reaction, the catalyst was activated at 500° C. for 2 hours under a nitrogen atmosphere. C used in the experiment 4 The feedstock comes from the catalytic cracking unit (FCC) in the refinery.

[0015...

Embodiment 4～7

[0019] The space velocity also has a significant impact on the reaction of olefin catalytic cracking to produce propylene. Generally speaking, increasing the reaction space velocity is beneficial to the selectivity of the reaction product propylene, but it will reduce the conversion rate of olefin.

[0020] According to US3702886, a ZSM-5 molecular sieve with a silicon-aluminum ratio (molar ratio) of 100 was synthesized, and then the HZ-1 catalyst was obtained by the same preparation method as in Examples 1-3.

[0021] Change the liquid space velocity of raw material, reaction condition and reaction result are shown in table 2.

[0022] project

[0023] Catalyst: HZ-1 Reaction temperature 540°C

Embodiment 8～10

[0025] Take 5 grams of the HZ-1 catalyst and treat it at 650° C. and 100% steam for 20 hours to prepare the catalyst HZ-2. The treatment conditions of water vapor were changed to obtain catalyst HZ-3. Catalyst HZ-2, HZ-3 and the catalyst HZ-1 that obtains with embodiment 4~7 use the C used in embodiment 1 4 Raw materials were used for comparative experiments, and the reaction results are shown in Table 3.

[0026] Catalyst

[0027] Reaction temperature: 520°C LHSV=15 hours -1

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PUM

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Abstract

A process for preparing propene by catalytic cracking for C4 and C4+x olefine features that the ZSM molecular sieve, which has been treated by water vapour at 500-700 deg.C for 1-80 hr, is used as catalyst. Its advantage is high output rate.

Description

technical field [0001] The invention relates to a method for producing propylene by catalytic cracking of olefins with carbon four and above. Background technique [0002] At present, in the world, there are a considerable number of C 4 and C 4 The above olefin feedstock. Affected by factors such as changes in the chemical product market and transportation costs, deep processing of these raw materials on site is a better way to utilize them. where C 4 and C 4 The conversion of the above olefins to propylene is a promising process. On the one hand, this process can utilize relatively surplus, low added value C 4 and C 4 On the other hand, the above olefin raw materials can be used to obtain propylene products with a wide range of uses. [0003] In EP0109059A1, a kind of C 4 ~C 12 Process for the conversion of olefins to propylene. The catalyst used in this document is SiO 2 / Al 2 o 3 ZSM-5 molecular sieve with a ratio less than or equa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/02C07C11/06
Inventor 滕加伟赵国良宋庆英谢在库
Owner CHINA PETROLEUM & CHEM CORP