Process of catalytically cracking C4 and above olefin to produce propylene

A catalytic cracking and olefin technology, applied in the direction of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., can solve the problems of low yield and low selectivity of the target product propylene, achieve improved shape selectivity, good technical effect, and suppress hydrogen transfer reaction Effect

Inactive Publication Date: 2004-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of low selectivity and low yield of the target product propylene in previous literatures, 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

[0017] 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.

[0018] 5 grams of silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is 100 ZSM-5 molecular sieves, 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. 4 grams of hydrogen-type ZSM-5 molecular sieves were mixed with 6.7 grams of 40% (weight) silica sol, and then extruded. After drying at 120°C and calcining at 400°C, the Z-0 catalyst was prepared. 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.

[00...

Embodiment 4～7

[0024] 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.

[0025] According to US3702886, the molar ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) is a ZSM-5 molecular sieve of 200, and then obtains the HZ-1 catalyst according to the same preparation method as in Examples 1-3.

[0026] C used in the experiment 4 The feedstock comes from the catalytic cracking unit (FCC) in the refinery. Change the liquid space velocity of raw material, reaction condition and reaction result are shown in table 2.

[0027]

[0028] Catalyst: HZ-1 Reaction temperature 540°C

Embodiment 8～11

[0030] The silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is the former powder of ZSM-5 molecular sieve of 300, and then obtain Z-0 catalyst according to the preparation method identical with embodiment 1~3. The above-mentioned 5 grams of silicon-aluminum molar ratio (SiO 2 / Al 2 o 3 ) is the former powder of ZSM-5 molecular sieve of 300, is placed in 200 milliliters, 5% weight NH 4 NO 3In 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. Mix 4 grams of hydrogen-type ZSM-5 molecular sieve with 4 milliliters of an aqueous solution containing 0.17 grams of magnesium nitrate, dry overnight at room temperature, and add 6.7 grams of 40% (weight) silica sol as a binder after drying at 120° C. for extrusion molding. After drying at 120°C and calcining at 400°C, catalyst Z-1 was obtained. By changing the amount of magnesium salt added, ca...

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Abstract

The present invention relates to the process of catalytically cracking C4 and above olefin to produce propylene, and aims at raising product propylene selectivity and yield. The present invention adopts ZSM type molecular sieve catalyst carrying alkali earth metal, and the reaction material C4 and above olefin produces cracking reaction to produce propylene under the conditions of 400-600 deg.c temperature, 0-0.15 MPa reaction pressure and 10-50 / hr liquid phase space velocity. The present invention may be used in the industrial production of catalytically cracking C4 and above olefin to produce propylene.

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 the document 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 molar ...

Claims

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Application Information

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