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Propylene recovery method

A technology for propylene and recovery towers, which can be used in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., and can solve the problem of high energy consumption

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there is a problem of high energy consumption in the prior art, and a new method for recovering propylene is provided

Method used

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  • Propylene recovery method

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Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, taking a 100,000-ton / year PO plant as an example, the raw material 11 containing α,α-dimethylbenzyl alcohol, cumene, propylene oxide, propylene and propane from the epoxidation reaction system is first sent to The high-pressure propylene recovery tower 1 is used for separation, and a stream 4 is obtained from the top of the tower, and a stream 5 containing α,α-dimethylbenzyl alcohol, cumene, propylene oxide, a small amount of propylene and propane is obtained from the bottom of the tower. Stream 5 is sent to low-pressure propylene recovery tower 2 for separation, stream 6 is obtained at the top of the tower, and crude propylene oxide product stream 8 for removing propylene is obtained in the tower reactor. The overhead stream 6 of the low-pressure propylene recovery tower 2 is divided into two parts, and a part of the stream 7 enters the depropanizer. After separation, the stream 9 is obtained at the top of the tower, and the propane stream 10...

Embodiment 2

[0035] With [embodiment 1], just raw material and operating condition change.

[0036] In the raw material, by weight percent, the content of α,α-dimethylbenzyl alcohol is 26%, the content of cumene is 21.5%, the content of propylene oxide is 10.5%, the content of propylene is 39%, the content of propane The content is 2%.

[0037] The operating conditions of the high-pressure propylene recovery tower are as follows: the operating pressure is 1.6MPa, the operating temperature at the top of the tower is 40°C, the operating temperature at the bottom of the tower is 87°C, and the number of theoretical plates is 25.

[0038] The operating conditions of the low-pressure propylene recovery tower are as follows: the operating pressure is 0.2 MPa, the operating temperature at the top of the tower is -20°C, the operating temperature at the bottom of the tower is 120°C, and the number of theoretical plates is 20.

[0039] The operating conditions of the depropanizer are as follows: the...

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Abstract

The present invention relates to a propylene recovery method. A purpose of the present invention is mainly to solve the high energy consumption in the prior art. According to the present invention, the propylene recovery refining process containing the high pressure propylene recovery tower, the low pressure propylene recovery tower and the depropanization tower is used to well solve the problem in the prior art, and the method can be used for the propylene recovery through the propylene oxide device in the industrial production.

Description

technical field [0001] The invention relates to a method for recovering propylene, in particular to a method for recovering propylene from a propylene epoxidation reaction product. Background technique [0002] Propylene oxide (PO) is a very important organic chemical raw material. It is the third largest organic chemical product in the output of propylene derivatives after polypropylene and acrylonitrile. It is mainly used in the production of polyether, propylene glycol, isopropanolamine, Non-polyether polyols, etc., and then produce unsaturated polyester resins, polyurethanes, surfactants, flame retardants, etc., which are widely used in chemical industry, light industry, medicine, food, textile and other industries, and have great significance for the development of chemical industry and national economy. profound influence. With the expansion of the use of propylene oxide and the growth of the amount of downstream products, the market demand for propylene oxide is incr...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07D301/32C07D303/04
Inventor 杨卫胜李木金
Owner CHINA PETROLEUM & CHEM CORP
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