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Method for producing propene for C4 and more olefin catalytic cracking

A technology of catalytic cracking and olefins, which is applied in the fields of hydrocarbon cracking, chemical recovery, organic chemistry, etc., and can solve the problems of low silicon and aluminum, and no catalyst stability investigation.

Active Publication Date: 2005-05-04
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 particles has a significant effect on the stability of the catalyst. ZSM-5 molecular sieves with three particle sizes of A, B, and C were synthesized according to the proportions 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, 5% wt NH 4 NO 3 The solution was exchanged at a temperature of 85 to 90° C. for 2 hours, and repeated 3 times. After the exchange, the ZSM-5 molecular sieve of hydrogen type was obtained by washing and drying at 120°C. 4 grams of hydrogen-type ZSM-5 molecular sieve was added to 6.7 grams of 40% silica sol, mixed, and then extruded. After drying at 120°C and calcining at 400°C, A-1 catalyst was obtained. In the same way, catalyst B-1 and catalyst C-1 were prepared by using molecular sieves B and C.

[0022] Before the reaction, the catalyst was activated at 500°C under nitrogen a...

Embodiment 4～6

[0026] With reference 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, prepare molecular sieve D, the particle size of molecular sieve D is 0.5 microns, and then prepare catalyst D-1 according to the same method as Example 1-3.

[0027] The D-1 catalyst was used, the raffinate mixed C4 was used as the raw material, and the weight space velocity was used for 2 hours at 550 ° C, respectively. -1 , 16 hours -1 , 19 hours -1 The reaction was carried out under the conditions of figure 2 .

Embodiment 7

[0029] Using D-1 catalyst, using raffinate mixed C4 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 conditions of image 3 .

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PUM

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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 of carbon four and above. Background technique [0002] At present, there are a considerable number of C 4 and C 4 The above olefin feedstock. Influenced by changes in the chemical product market and transportation costs, on-site deep processing of these raw materials 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, the process can utilize the relatively surplus and low value-added C 4 and C 4 The above olefin raw materials, on the other hand, can obtain widely used propylene products. [0003] Document WO 9929805 proposes a 4 and C 4 The above method for producing propylene from olefins. The catalyst in this document uses SiO 2 / Al 2 O 3 ZSM-5 molecular sieve with a high silicon-aluminum ratio of 600-2000, the reaction temperat...

Claims

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Application Information

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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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