Method for separation of products of reaction for preparation of propylene from propane by dehydrogenation

A reaction product, propane dehydrogenation technology, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problems of high energy consumption, large absorbent circulation, etc., and achieve the effect of low energy consumption, convenient operation, and less cooling capacity

Inactive Publication Date: 2017-01-11
SINOPEC GUANGZHOU ENG +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for separating the reaction product of propane dehydrogenation to propylene, which is achieved by combining the propylene-added ethylene cascade refrigeration process with an expander and the deethani

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  • Method for separation of products of reaction for preparation of propylene from propane by dehydrogenation

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[0030] Attached below figure 1 The present invention will be further described in detail with specific embodiments, but the specific embodiments do not limit the scope of protection of the present invention.

[0031] like figure 1Propane dehydrogenation to propylene reaction product 1 is compressed to 1.2-2.0 MPa (gauge pressure) through three-stage compression system 2, cooled to 5-10 °C through compression outlet cooling unit 3, and then enters drying system 4, where the reaction product is The water content in the product is reduced to less than 1ppm. Under the action of the propylene refrigeration system 28, it is cooled to -35~-20°C by the first-stage refrigerator 5 and then enters the first-stage cryogenic tank 6 for gas-liquid separation. Under the action of the ethylene refrigeration system 9, it is cooled to -95~-85°C through the second-stage refrigerator 8, and then enters the second-stage cryogenic tank 10 for gas-liquid separation. , the temperature drops to -12...

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Abstract

The invention discloses a method for separation of products of reaction for preparation of propylene from propane by dehydrogenation, and belongs to the field of petrochemical industry, by the way of combination of a propylene and ethylene cascade refrigeration process with an expansion machine and a deethanization process with a deethanizer top condensation section, the products of reaction for preparation of propylene from propane by dehydrogenation can be separated, propane can be obtained by fractional distillation on depropanizator top, and is used as a reaction cycle material flow to return to the part of the reaction for preparation of propylene from propane by dehydrogenation for further reaction, and a depropanizator bottom product C4 + fraction is sent out of a device. The method can overcome the problems of a large circulation amount of an absorbent and high energy consumption in the prior art.

Description

technical field [0001] The invention belongs to the field of petrochemical industry or natural gas chemical industry, and in particular relates to a method for separating reaction products from propane dehydrogenation to propylene. Background technique [0002] Propylene is an important basic organic chemical raw material in the chemical industry. For a long time, the sources of propylene at home and abroad mainly depend on the co-production of naphtha cracking and FCC by-products. According to statistics, the Chinese market accounts for more than 15% of the global demand for propylene, and the consumption is still growing at a rate of about 5% to 6% per year. The gap between supply and demand of propylene has been increasing in recent years. With the shortage of petroleum resources and the price of natural gas being cheaper than that of crude oil, the derived C3 and C4 alkanes have attracted more and more attention, among which propane catalytic dehydrogenation technology ...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C7/04
Inventor 孙秋荣徐又春郭劲鹤杨旭东罗妍寇肖董海芳王发辉张钟岩冯好喆田纪伟
Owner SINOPEC GUANGZHOU ENG
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