Method for producing propene for C4 and more olefin catalytic cracking

A catalytic cracking and olefin technology, applied in hydrocarbon cracking, chemical recovery, organic chemistry, etc., can solve the problems of untested catalyst stability and low silicon and aluminum

Inactive Publication Date: 2006-09-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon-alumina ratio of the ZSM-5 molecular sieve catalyst used in this document is low (SiO 2 / Al 2 o 3 Less than or equal to 220), and in the examples in the above-mentioned documents, the stability investigation of the catalyst is not carried out, only the initial activity of the catalyst is given

Method used

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  • Method for producing propene for C4 and more olefin catalytic cracking
  • Method for producing propene for C4 and more olefin catalytic cracking
  • Method for producing propene for C4 and more olefin catalytic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0018] The size of the molecular sieve grains has a significant effect on the stability of the catalyst. ZSM-5 molecular sieves with three particle sizes A, B, and C were synthesized respectively according to the ratio and crystallization conditions in Table 1.

[0019] Molecular sieve

[0020] TPABr is tetrapropylammonium bromide.

[0021] Place 5 g of ZSM-5 molecular sieve A in 200 ml of 5 wt% 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% silica sol, and then extruded. After drying at 120°C and calcining at 400°C, catalyst A-1 was obtained. Catalyst B-1 and catalyst C-1 were prepared using molecular sieves B and C in the same manner.

[0022] Before the reaction, the catalyst was activated at 500° C. for 2 hours under a nitrog...

Embodiment 4～6

[0026] Referring to the method for preparing molecular sieve C in Table 1, change the silicon-aluminum ratio of molecular sieve, according to SiO 2 / Al 2 o 3 =450 proportioning, prepare molecular sieve D, the particle diameter of molecular sieve D is 0.5 micron, then prepare catalyst D-1 according to the same method of embodiment 1-3.

[0027] Using D-1 catalyst, using raffinate mixed carbon four as raw material, at 550°C, respectively using a weight space velocity of 2 hours -1 , 16 hours -1 , 19 hours -1 The conditions for the reaction, the results see figure 2 .

Embodiment 7

[0029] Using D-1 catalyst, using raffinate mixed carbon four as raw material, changing the reaction temperature, at 580 ° C, the weight space velocity is 16 hours -1 , the reaction was carried out under the condition of image 3 .

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Abstract

The invention relates to a kind of method for manufacturing propylene by catalytic cracking alkene of no less than tetra carbon, which mainly solves the short catalyst regeneration period problem and the stability problems uninvolved in previous technique. The invention uses minor crystalline grain and molecular sieve with high silicon-aluminium ratio as the catalyst for catalytic cracking with alkene that no less than tetra carbon to manufacture propylene. According to the technique scheme that described above, the invention can solve the problems mentioned above excellently, and can be used in industrial production of manufacturing propylene by catalytic cracking with alkene.

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] Document WO9929805 has proposed a kind of utilization containing C 4 and C 4 A method for producing propylene from the above olefins. The catalyst used in this document is SiO 2 / Al 2 o 3 ZSM-5 mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/06
CPCY02P20/584
Inventor 滕加伟赵国良金文清谢在库
Owner CHINA PETROLEUM & CHEM CORP
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