Process for producing propylene oxide

A technology of propylene oxide and cumene hydroperoxide, which is applied in the direction of organic chemistry, can solve the problem of high energy consumption, achieve the effects of improving purity, good technical effect, and reducing energy consumption

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 producing propylene oxide is provided

Method used

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  • Process for producing propylene oxide

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Experimental program
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Effect test

Embodiment 1

[0032] like figure 1As shown, taking a 100,000-ton / year PO plant as an example, the raw material cumene hydroperoxide 1 and fresh propylene 2 react in reactor I to form a liquid phase stream 3 containing propylene oxide and propylene. Stream 3 is sent to the middle part of the high-pressure propylene recovery tower II. After separation, the propylene 6 obtained from the side line of the tower is divided into two parts, most of the propylene 8 is sent back to the epoxidation reaction system I to participate in the reaction, and a small part of propylene 7 enters the depropanizer VI for refining , the heavy component 5 obtained in the bottom of the tower is sent to the adiabatic flash tank III for separation, and the light component 4 obtained in the top of the tower is discharged. The gas phase product 11 obtained from the top of the flash tank III is sent to the middle part of the low-pressure propylene recovery tower IV, and the liquid phase product 12 obtained at the bottom ...

Embodiment 2

[0043] With [embodiment 1], just raw material and operating condition change.

[0044] In stream 3, 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%, propane The content is 2%.

[0045] The operating conditions of the high-pressure propylene recovery tower are as follows: the operating pressure is 1.8MPa in gauge pressure, the operating temperature at the top of the tower is 45°C, the operating temperature at the bottom of the tower is 124°C, and the number of theoretical plates is 25.

[0046] The operating conditions of the low-pressure propylene recovery tower are as follows: the operating pressure is 0.2MPa in gauge pressure, the operating temperature at the top of the tower is 30°C, the operating temperature at the bottom of the tower is 119°C, and the number of theoretical plates is 20.

[0047] The operating conditions of the depropanizer are as ...

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Abstract

The invention relates to a method for producing propylene oxide, which mainly solves the problem of high energy consumption in the prior art. The present invention adopts the following steps: CHP and propylene generate a liquid phase stream in the reactor; the liquid phase stream enters the middle part of the high-pressure propylene recovery tower, the first light component is obtained from the top of the tower, the first heavy component is obtained from the tower kettle, and the side line is obtained from the middle part of the tower Logistics; the side stream is divided into the first side stream and the second side stream; the first side stream enters the middle of the depropanizer, the second light component is obtained from the top of the tower, and the second heavy component is obtained from the bottom of the tower; the first heavy component enters the flash evaporation Tank, the third light component at the top of the tank, the third heaviest component at the bottom of the tank; the third light component enters the middle of the low-pressure propylene recovery tower, the third heaviest component enters the first tray at the top of the tower, and the fourth light component at the top of the tower Component, the fourth heavy component is obtained in the tower still; the fourth light component enters the high-pressure propylene recovery tower tower; the technical scheme of the second side stream and the second light component recycling back to the reactor solves this problem well, and can be used In the industrial production of propylene oxide.

Description

technical field [0001] The present invention relates to a method for producing propylene oxide. 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 increasing. [0003] The method of industrial production propylene oxide mainly contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D301/32C07D303/04
Inventor 李木金杨卫胜陈伟翟仲曦
Owner CHINA PETROLEUM & CHEM CORP
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