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Naphtha catalytic pyrolysis catalyst for preparing ethylene propylene

A catalytic cracking, ethylene propylene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problems of high operating temperature, low ethylene propylene yield, low catalyst activity, etc.

Active Publication Date: 2008-10-08
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 that the catalyst activity used in the existing naphtha catalytic cracking reaction is low, the yield of ethylene propylene is low, and the use temperature is high. A new method for producing ethylene by naphtha catalytic cracking Propylene Catalyst

Method used

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  • Naphtha catalytic pyrolysis catalyst for preparing ethylene propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 33.3 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 24.4 grams of ethyl acetate. Diamine, after stirring for a period of time, adjust the pH to 11.5 with dilute sulfuric acid, and control the molar ratio of the sol as: Si:Al:ethylamine:H 2 O=1:0.1:0.4:40, add 2.8 grams of Y zeolite seed crystals, put the mixed solution into the 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 roast at 550°C After 3 hours, the ZSM-5 / Y zeolite symbiotic molecular sieve was prepared. The XRD pattern is as follows figure 1 As shown in the middle curve 1, it can be quantified by XRD diffraction that the symbiotic molecular sieve contains 94.5% of ZSM-5 and 5.5% of Y zeolite by weight percentage. Exchange twice with 5% ammoniu...

Embodiment 2～4

[0020] According to the method of Example 1, the pH of the solution was controlled to be 10.5, 11, and 12, respectively, and ZSM-5 / Y zeolite symbiotic molecular sieves were synthesized, respectively, denoted as FH-2, FH-3, and FH-4. The ratio of ZSM-5 and Y zeolite is shown in Table 4. According to the method of Example 1, the results are shown in Table 5.

Embodiment 5～12

[0022] According to the method of Example 1, the different molar ratios of the solutions were controlled, and the synthesized ZSM-5 / Y zeolite intergrowth molecular sieve was shown in Table 2, and the ratio of ZSM-5 and Y zeolite was shown in Table 4. According to the method of Example 1, the results are shown in Table 5.

[0023] Table 2

[0024] Example

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Abstract

The present invention relates to a catalyst used for manufacturing ethylene and propylene by naphtha catalytic pyrolysis which mainly solves the problems of high reaction temperature and low yield of catalyst to ethylene and propylene in the existing catalytic pyrolysis reaction. The present invention better solves the problems by adopting the technical proposal of taking a ZSM-5 / Y zeolite symbiosis molecular sieve as the catalyst. The present invention can be used for the industrial production of ethylene and propylene by naphtha catalytic pyrolysis.

Description

Technical field [0001] The invention relates to a catalyst for preparing ethylene and propylene through the catalytic cracking of naphtha. Background technique [0002] With the development of society, the market demand for ethylene and propylene in my country has increased sharply. The import volume of ethylene and propylene and its downstream products has increased year by year, and the domestic product market share is less than half. At present, the world's ethylene mainly uses naphtha (or ethane) as a raw material and uses steam thermal cracking technology (at a temperature of about 800°C) to produce, 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 standard cracking reaction, so it consumes less energy than ordinary steam cracking, and the rate of coking on the inner wall of the cracking furnace tube will be reduced, which can extend the operation cycle and increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C4/06C07C11/02
CPCY02P20/52
Inventor 马广伟谢在库胡永君肖景娴杨霞琴
Owner CHINA PETROLEUM & CHEM CORP
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