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Catalyst for catalytic pyrolysis

A catalytic cracking and catalyst technology, which is applied in the field of catalysts for producing ethylene propylene from naphtha catalytic cracking, can solve the problems of high operating temperature, low ethylene propylene yield, and low catalyst activity, and achieve high acid density, high acid strength, enhance the effect of acidity

Active Publication Date: 2009-05-13
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 that the catalyst activity used in the existing reaction of naphtha catalytic cracking to ethylene propylene is low, the yield of ethylene propylene is low, and the use temperature is high. catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 33.3 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 24.4 grams of B Diamine, after stirring for a period of time, adjust the pH value at 11.5 with dilute sulfuric acid, and control the molar ratio of the sol: Si: Al: ethylenediamine: H 2 O=1:0.1:0.4:40, add seeds containing ZSM-5 and mordenite precursors, stir for 30 minutes, put the mixed solution in an autoclave, keep it at 180°C for 40 hours, then take it out and wash it twice, Drying at 120°C for 4 hours and calcining at 550°C for 3 hours produced an intergrown molecular sieve of ZSM-5 and mordenite. Quantification by XRD diffraction showed that the weight contents of ZSM-5 and mordenite in the intergrown molecular sieve were 95% and 5%, respectively. Use ammonium nitrate solution with a concentration of 5%,...

Embodiment 2

[0022] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 16.7 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 12.2 grams of B Diamine and 29.4 grams of tetraethylammonium hydroxide (the mixed template is denoted as M), after stirring for a period of time, adjust the pH value at 11 with dilute sulfuric acid, and control the molar ratio of the sol: Si: Al: M: H 2 O=1:0.05:0.4:40, add 2.8 grams of zeolite beta seed crystals, put the mixed solution in an autoclave, keep it at 160°C for 40 hours, then take it out and wash it twice, dry it at 120°C for 4 hours, and bake it at 550°C After 3 hours, the ZSM-5 / beta zeolite intergrowth molecular sieve was prepared, and XRD diffraction quantification showed that the weight percentage of ZSM-5 in the intergrowth molecular sieve was 94.6%, and beta zeolite was 5.4%. Use ammonium nit...

Embodiment 3

[0024] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 33.3 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 24.4 grams of B Diamine, after stirring for 20 minutes, adjust the pH value at 11.5 with dilute sulfuric acid, and control the molar ratio of the sol: Si: Al: ethylenediamine: H 2 O=1:0.1:0.4:40, add 2.8 grams of Y zeolite seed crystals, put the mixed solution in an autoclave, keep it at 130°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, and bake at 550°C After 3 hours, the ZSM-5 / Y zeolite intergrowth molecular sieve was prepared. Quantification by XRD diffraction shows that the intergrown molecular sieve contains 94.5% by weight of ZSM-5 and 5.5% by weight of Y zeolite. Use ammonium nitrate solution with a concentration of 5%, exchange twice at 70°C, and then roast at 550°C for ...

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Abstract

The invention relates to a catalyst for catalytic cracking and mainly solves the problems of high service temperature and low yield of ethylene-propylene copolymer in the prior catalyst for catalytic cracking in ethylene-propylene copolymer synthesis. In order to solve the problems, the technical scheme is as follows: the catalyst is obtained by loading at least one element of the group IB or the group IIB in the periodic table of elements on a ZSM-5 / mordenite molecular sieve, ZSM-5 / beta-zeolite molecular sieve or ZSM-5 / Y-zeolite molecular sieve. The catalyst is applied to the industrial production of ethylene-propylene copolymer via catalytic cracking of petroleum naphtha.

Description

technical field [0001] The invention relates to a catalyst for catalytic cracking, in particular to a catalyst for producing ethylene propylene by catalytic cracking of naphtha. Background technique [0002] With the development of society, the market demand for ethylene propylene in my country has increased sharply, the import volume of ethylene propylene and its downstream products has increased year by year, and the market share of domestic products is less than half. At present, ethylene in the world mainly uses naphtha (or ethane) as raw material and adopts steam pyrolysis technology (at a temperature of about 800°C) to produce ethylene, and its output exceeds 90% of the total output. Compared with steam thermal cracking, the reaction temperature of catalytic cracking is about 50-200℃ lower than that of standard cracking reaction, so the energy consumption is less than that of ordinary steam cracking, and the coking rate of the inner wall of cracking furnace tube will b...

Claims

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Application Information

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IPC IPC(8): B01J29/80C07C4/06C07C11/02
CPCY02P20/52
Inventor 马广伟谢在库杨为民陈亮顾龙勤
Owner CHINA PETROLEUM & CHEM CORP
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