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Method for preparing ethylene and propylene by two-step method

A technology of ethylene and propylene, which is applied in the field of ethylene and propylene preparation, can solve the problems of energy consumption affecting production efficiency, and achieve the effect of reducing heat load and saving energy

Active Publication Date: 2009-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cracking process is an endothermic reaction, so in industrial production, energy consumption is a major problem affecting its production efficiency

Method used

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  • Method for preparing ethylene and propylene by two-step method
  • Method for preparing ethylene and propylene by two-step method
  • Method for preparing ethylene and propylene by two-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1, the preparation A of catalytic cracking catalyst

[0068] Mix 30.15g of aluminum isopropoxide with 54.17g of water, add 17.11g of phosphoric acid under stirring, continue to stir, add 9.32g of tetraethyl silicate, and finally add 36.19g of tetraethylammonium hydroxide template with a mass content of 30% , continue stirring to make a uniform gel. The above gel solution was transferred into a stainless steel crystallizer, sealed, and left to stand at a constant temperature of 200°C for 120 hours for crystallization. After the crystallization is completed, the product is cooled rapidly, the mother liquor is poured out, the precipitate is separated by centrifugation, and washed several times with pure water until the pH value of the solution is 8-9, and then the obtained crystal is dried at 115°C for 3 hours, 550 The templating agent was removed by calcining at ℃ for 5 hours to obtain SAPO-34 molecular sieve.

[0069] The SAPO-34 molecular sieve was directly...

Embodiment 2

[0070] Embodiment 2, the preparation B of catalytic cracking catalyst

[0071] Get the water glass 156g that modulus is 3.6 and dissolve in 50g water. Take another 1g of Al with a mass content of 99% 2 (SO 4 ) 3 18H 2O, then mix homogeneously with the concentrated sulfuric acid of 98% with 15g mass content, then mix homogeneously with 75ml water. The two solutions were mixed under vigorous stirring, and 50 g of tetrapropylammonium hydroxide template agent with a mass content of 10% was added, and the stirring was continued to form a uniform gel. Transfer the gelled object into a stainless steel crystallizer, seal it, and crystallize at 180°C for 50 hours. After the crystallization is completed, the product is cooled rapidly, the mother liquor is poured out, the precipitate is separated by centrifugation, and washed several times with pure water until the pH value of the solution is 8-9, and then the obtained crystal is dried at 120°C for 12 hours, 550 The templating agen...

Embodiment 3

[0073] Embodiment 3, the preparation C of catalytic cracking catalyst

[0074] Mix the SAPO-34 molecular sieve prepared in Example 1 with the hydrogen-type ZSM-5 molecular sieve prepared in Example 2 in a ratio of 2:3, and then mix it with Al2O3 binder in a ratio of 2:1, and put it on the extruder Extruded to obtain catalyst C.

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Abstract

The invention relates to a method for preparing ethene and propylene, in particular to a method for preparing the ethene and the propylene by using methanol and alkene with four and more than four carbon atoms as raw materials through a two-step method. The methanol and dimethyl ether used as a first raw material and the alkene with four and more than four carbon atoms used as a second raw materiel carry out etherealization reaction to generate a methyl-alkyl ether compound; and the methyl-alkyl ether compound is cracked to generate the ethene and the propylene. With the method, the cracking reaction is easier to carry out; therefore, at the relatively low temperature, the cracking of the alkene with four and more than four carbon atoms can be realized; simultaneously, the method reduces the hot load of the reaction system and saves energy.

Description

technical field [0001] The invention relates to a method for preparing ethylene and propylene, in particular to a method for preparing ethylene and propylene by first etherifying methyl alkyl ether and then cracking using methanol and carbon four or more olefins as raw materials. Background technique [0002] Low-carbon olefins ethylene and propylene are the most important basic organic chemical raw materials and the leading products of petrochemical industry. The production of light olefins in petrochemical industry mainly depends on cracking method, and its raw materials are mainly naphtha (light and full boiling range), diesel oil (light and heavy). At present, there is a contradiction between the rapid development of the chemical industry and the decreasing use of petroleum resource reserves in the world, resulting in a large demand for low-carbon olefins and a shortage of raw materials for production. Therefore, seeking new raw materials and methods for the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C11/06C07C1/20
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 张飞张明森柯丽冯静黄志永许春梅张建华
Owner CHINA PETROLEUM & CHEM CORP
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