Catalyst for producing olefins by catalytic cracking and its preparation method and application

A catalytic cracking and catalyst technology, applied in physical/chemical process catalysts, hydrocarbon cracking to hydrocarbons, molecular sieve catalysts, etc., can solve the problems of too fast catalyst deactivation, high catalyst cost, low olefin yield, etc., and achieve the purpose of suppressing carbon deposition formation, inhibition of deep cracking, and reduction of reaction temperature

Active Publication Date: 2019-09-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned catalysts generally have one or more deficiencies such as high cost, low olefin yield, high reaction temperature, too fast catalyst deactivation, and poor stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] (1) Preparation of ZSM-5 molecular sieve. Prepare 100 ml of aqueous solution containing 90 grams of water glass, add 30 ml of aqueous solution containing 13 grams of aluminum sulfate therein, and vigorously stir. At the same time, 16 grams of tetrapropylammonium bromide was added as a template agent, and the pH value was adjusted to 10 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 140° C. for 40 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 50, and a hydrogen-form ZSM-5 molecular sieve is obtained after ammonium exchange.

[0028] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 12gMg(NO 3 )2 Prepare a 70ml aqueous solution, add 65 grams of ZSM-5 molecular sieves to it, ...

example 2

[0034] (1) Preparation of ZSM-5 molecular sieve. Prepare 120ml of aqueous solution containing 95 grams of water glass, add 30ml of aqueous solution containing 12 grams of aluminum sulfate therein, and vigorously stir. At the same time, 18 g of tetrapropylammonium bromide was added as a template, and the pH value was adjusted to 11 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 150° C. for 30 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 80, and a hydrogen-type ZSM-5 molecular sieve is obtained after ammonium exchange.

[0035] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 15gMg(NO 3 ) 2 Prepare 100ml of aqueous solution, add 85g of ZSM-5 molecular sieve to it, stir evenly, a...

example 3

[0041] (1) Preparation of ZSM-5 molecular sieve. Prepare 90 ml of aqueous solution containing 75 grams of water glass, add 50 ml of aqueous solution containing 23 grams of aluminum sulfate therein, and vigorously stir. At the same time, 16 grams of tetrapropylammonium bromide was added as a template agent, and the pH value was adjusted to 10 with dilute sulfuric acid. Stirring was continued until a jelly-like substance was obtained, and the resulting jelly-like substance was transferred into an autoclave and kept at 150°C for 25 hours. After the crystallization is completed, the obtained product is washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / aluminum ratio of 30, and a hydrogen-form ZSM-5 molecular sieve is obtained after ammonium exchange.

[0042] (2) To modify the hydrogen ZSM-5, use Mg(NO 3 ) 2 Aqueous solution can impregnate and modify ZSM-5. Take 13gMg(NO 3 ) 2 Prepare 90ml of aqueous solution, add 65g of ZSM-5 molecular sieve to it, stir e...

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Abstract

The invention discloses a catalyst for preparing alkene through catalytic cracking. The catalyst takes an alkaline-earth-metal-modified MFI molecular sieve as a carrier and heteropoly acid as an active component, wherein in the alkaline-earth-metal-modified MFI molecular sieve, the weight of alkaline earth metal is 0.5-2.5% of that of an MFI molecular sieve, and the weight of the active component is 0.2-4% of that of the carrier. An alkali metal oxide or alkali metal salt is used to modify the catalyst, and the mass of the alkali metal oxide or alkali metal salt is 0.1-4% of that of the catalyst. A preparation method of the catalyst comprises: soaking the molecular sieve with a nitrate solution of alkaline earth metal, drying the soaked material and performing calcination; loading the modified molecular sieve with the active component through adoption of a heteropoly acid aqueous solution, and drying the soaked material; mashing the obtained material, a proper amount of water and a binder, and performing mixing kneading, molding, drying and calcination; and modifying the obtained material with alkali metal oxide or alkali metal salt, drying the modified product, and performing calcination to obtain the final catalyst. The catalyst is high in alkene yield, low in reaction temperature, and good in stability.

Description

technical field [0001] The invention relates to a catalyst for producing olefins by catalytic cracking and its preparation method and application, in particular to a catalyst for producing ethylene and propylene by catalytic cracking of naphtha and its preparation method and application. Background technique [0002] Since the beginning of the new century, the world’s demand for petrochemical raw materials and petrochemical products will continue to grow, and the demand for ethylene and propylene, which are the basic petrochemical raw materials, will continue to grow. However, the production capacity of conventional steam pyrolysis technology cannot meet the rapidly growing demand for propylene. Furnace steam pyrolysis is a process that consumes a lot of energy, and the process conditions are harsh. Compared with steam thermal cracking, the reaction temperature of naphtha catalytic cracking is about 50-200℃ lower than the standard cracking reaction. Therefore, it consumes le...

Claims

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Application Information

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IPC IPC(8): B01J29/48C07C11/04C07C11/06C07C4/06
Inventor 孙潇磊尹泽群刘全杰张志智
Owner CHINA PETROLEUM & CHEM CORP
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