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Method for producting propylene by catalytic pyrolysis of liquefied gas

A catalytic cracking and liquefied gas technology, which is applied in the production of bulk chemicals, organic chemistry, hydrocarbon cracking and hydrocarbon production, and can solve the problems of raw material sources and component limitations

Inactive Publication Date: 2010-09-29
上海傲佳能源科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a method for the production of propylene by catalytic cracking of liquefied gas in view of the shortcomings in the previous C4 olefin production technology. Produce propylene with high added value and market shortage, further improve the comprehensive utilization rate of liquefied gas and expand the source of raw materials for propylene production; at the same time, this method has the characteristics of high product yield and long catalyst cycle life

Method used

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  • Method for producting propylene by catalytic pyrolysis of liquefied gas

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Embodiment

[0034] Refer to attached figure 1 , the liquefied gas raw material (1) is sent to the depropanizer (2) after being preheated to 89 ° C, after rectification, the C3 and below components (3) are obtained at the top of the tower, and the bottom product enters the extractive distillation tower (4) . The extraction agent of the extractive distillation tower is sulfolane and co-solvent (mass ratio can be adjusted), and the solvent ratio (7-8) is controlled to extract butane from the C4 fraction, and the butane (5) is obtained at the top of the tower, and the rich Butene-rich solvents. The rich solvent enters the stripper (6), and by ordinary rectification, butene is separated from the extractant, and at the top of the stripper, 96% (quality) carbon tetraolefins (7) are obtained, and the lean extractant at the bottom of the tower is passed through After cooling to 52°C, it is sent back to the top of the extractive distillation tower (4) for recycling.

[0035] Refer to attached ...

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Abstract

The invention relates to a method for producting propylene by catalytic pyrolysis of liquefied gas, which mainly solves the problems that the existing process limits the source of raw materials and components, the yield of the propylene is low and the one-way service life of the catalyst is short. The common civil-use liquefied gas is preprocessed through depropanization, extractive distillation and the like, then is heated to be 500-600 DEG C after being exchaning heat with a reaction product, and carries out the pyrolysis reaction under the condition with 0.4MPa and mass space velocity of 0.8h-1; after being cooled, the gas-liquid separation is carried out on the reaction product to enter an absorption and stable system to be further separated to obtain the high-octane gasoline component and liquefied petroleum gas containing rich propylene and butylenes; and the liquefied petroleum gas is further separated to obtain fine propylene. The invention makes full use of the common civil-use liquefied gas in markets to product propylene with a high added value, can be used in an industrial unit for producting propylene, can relieve the contradiction between supply and demand of propylene, can improve the economic benefit of petroleum chemical enterprises, better solves the problems of deep processing of liquefied petroleum gas and increasing production of propylene.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for producing propylene by catalytic cracking by using common liquefied gas in the market. Background technique [0002] Liquefied petroleum gas is one of the by-products of refineries or petrochemical plants. Its main components are propane, propylene, butane, and butene, and it also contains a small amount of pentane and trace impurities. Because propylene and butene are widely used as chemical raw materials, refineries or petrochemical plants remove all propylene and some butene components from the liquefied gas before leaving the factory for further further processing or separate sales. Therefore, the main components of ordinary liquefied petroleum gas on the market are propane, butane and a small amount of butene. At present, they are mainly used as fuels in my country, especially civil gas is directly burned, and its comprehensive utilization rate is...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C4/06
CPCY02P20/52
Inventor 周麟蔡芙蓉
Owner 上海傲佳能源科技有限公司
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