A catalyst for catalytic cracking to prepare alkenes and a preparing method thereof

A catalytic cracking and catalyst technology, applied in physical/chemical process catalysts, hydrocarbon cracking to hydrocarbon production, chemical instruments and methods, etc. Effects of coking and deep cracking, lowering reaction temperature, and increasing selectivity

Active Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of existing naphtha catalytic cracking to produce ethylene propylene, such as low yield, high reaction temperature, and easy deactivation of the catalyst, the present invention provides a catalyst for producing ethylene propylene by naphtha catalytic cracking and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of isomorphously substituted ZSM-5 molecular sieves. Prepare 50 ml of an aqueous solution containing 40 g of water glass, add 25 ml of an aqueous solution containing 5 g of sodium metaaluminate, add 3 g of gallium oxide, and vigorously stir. At the same time, 17 g of tetrapropylammonium bromide was added as a template, 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 crystallization, the obtained product was washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / (aluminum+gallium) ratio of 60, in which 20% of Al was replaced by Ga isomorphously. After the ammonium exchange, the ZSM-5 molecular sieve with hydrogen-type metal isomorphic replacement is obtained.

[0024] (2) Using Al 2 o 3 As a binding agent, 75g of ZSM-5 molecular sieve replaced by is...

Embodiment 2

[0029](1) Preparation of isomorphously substituted ZSM-5 molecular sieves. Prepare 130ml of an aqueous solution containing 120g of water glass, add 20ml of an aqueous solution containing 5g of sodium metaaluminate, add 5g of gallium oxide, and vigorously stir. At the same time, 17 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 25 hours. After crystallization, the obtained product was washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / (aluminum+gallium) ratio of 110, in which 40% of Al was replaced by Ga isomorphously. After the ammonium exchange, the ZSM-5 molecular sieve with hydrogen type isomorphic replacement is obtained.

[0030] (2) Using Al 2 o 3 As a binding agent, 70g of ZSM-5 molecular sieve replaced by isomorphism...

Embodiment 3

[0035] (1) Preparation of isomorphously substituted ZSM-5 molecular sieves. Prepare 120ml of an aqueous solution containing 100g of water glass, add 30ml of an aqueous solution containing 4g of aluminum sulfate therein, add 8g of gallium oxide, and stir vigorously. At the same time, 9 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 25 hours. After crystallization, the obtained product was washed and filtered to obtain a ZSM-5 molecular sieve with a silicon / (aluminum+gallium) ratio of 90, in which Ga replaced 70% of Al. After ammonium exchange, ZSM-5 molecular sieves with hydrogen isomorphic replacement were obtained.

[0036] (2) Using Al 2 o 3 As a binder, 80g of ZSM-5 molecular sieves replaced by isomorphism, Al 2 o 3 Mix 25g of binder wit...

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PUM

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Abstract

A catalyst for naphtha catalytic cracking to prepare ethylene and propylene is disclosed. Based on the weight content of the catalyst, the catalyst comprises 40-90% of an MFI molecular sieve subjected to metal isomorphous substitution, 0.1-2.5% of a rare earth metal oxide and 0.2-2.0% of heteropoly acid. In the molecular sieve, Al in the molecular sieve is all or partially substituted by a metal, and the substituting metal is one or more selected from magnesium, calcium, zinc, gallium, and the like. A preparing method of the catalyst includes (1) substituting all or a part of the Al in the ZSM-5 molecular sieve by the selected substituting metal to prepare the ZSM-5 molecular sieve subjected to metal isomorphous substitution, (2) selecting a proper adhesive, pulping a proper amount of the heteropoly acid, a proper amount of the adhesive and the ZSM-5 molecular sieve subjected to metal isomorphous substitution in the step (1) to prepare a suspension, drying the suspension and then performing strip extrusion and molding, and (3) performing loading of the rare earth metal oxide through a hot-carrier dipping method, and drying the product after dipping to obtain the final catalyst. The catalyst has advantages of high alkene yields, low reaction temperatures, good catalyst stability, and the like.

Description

technical field [0001] The invention relates to a catalyst for producing olefins by catalytic cracking and a preparation method thereof, in particular to a catalyst for producing ethylene and propylene by catalytic cracking of naphtha, a preparation method and application thereof. 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°C lower than that of steam thermal cracking. Therefore, it consumes less ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J35/10C07C4/06C07C11/02C07C11/04C07C11/06
CPCY02P20/52
Inventor 孙潇磊张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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