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Method for preparing ethene and propene by naphtha catalysis cracking

A technology for ethylene propylene and catalytic cracking, which is applied in catalytic cracking, petroleum industry, cracking, etc. It can solve the problems of high catalyst use temperature and low ethylene propylene yield, and achieve the effect of high acid strength and good catalytic activity

Active Publication Date: 2008-06-04
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 the problem of high catalyst service temperature and low yield of ethylene propylene existing in the prior art, and a new method for preparing ethylene propylene by catalytic cracking of naphtha is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 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, a ZSM-5 / beta zeolite intergrowth molecular sieve was prepared, which was denoted as FH-1. Quantification by XRD diffraction shows that the weight percentage of ZSM-5 in the intergrown molecular sieve is 94.6%, and that of β zeolite ...

Embodiment 2～4

[0019] According to the method of Example 1, the pH of the solution was controlled to be 10.5, 11.5 and 12, respectively, and ZSM-5 / beta zeolite intergrowth molecular sieves were synthesized, which were respectively recorded as FH-2, FH-3 and FH-4. The ratio of ZSM-5 and zeolite beta is shown in Table 3. Evaluation according to the method of Example 1, the results are shown in Table 4.

Embodiment 5～11

[0021] According to the method of Example 1, the different molar ratios of the solutions are controlled, and the ratio of the two in the mixed template agent remains unchanged. The ZSM-5 / beta zeolite symbiotic molecular sieves synthesized respectively are shown in Table 2, and the ratios of ZSM-5 and beta zeolite are shown in Table 2. 3. Evaluation according to the method of Example 1, the results are shown in Table 4.

[0022] Table 2

[0023] Example

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Abstract

The invention relates to a method for catalytic cracking of naphtha to produce ethylene and propylene which mainly solves the problems that the activity of the catalyst is low, the yield of ethylene and propylene is low and the reaction temperature is high in the prior catalytic cracking to produce ethylene and propylene technology. The invention better solves the problems by adopting the technical proposal that: the raw material is made a contact reaction with the catalyst under the conditions that the intergrowth molecular sieve of ZSM-5 and beta zeolite, the intergrowth molecular sieve of ZSM-5 and Y zeolite or the mixture of the two are taken as the catalyst, the naphtha formed by C4-C10 hydrocarbon is taken as the raw material, the reaction temperature is between 600 and 700 DEG, the reaction pressure is between 0.001MPa and 0.5MPa, the space velocity of the reaction weight is between 0.1 and 4 h <-1>, the weight ratio of water / naphtha is 1-4:1. The invention can be used in the industrial production of catalytic cracking of naphtha for producing ethylene and propylene.

Description

technical field [0001] The invention relates to a method for preparing 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 be reduced, which can prolong the operation period and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/02C07C11/04C07C11/06
Inventor 肖景娴谢在库马广伟姚晖胡永君
Owner CHINA PETROLEUM & CHEM CORP
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