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A technology of propylene oxide and production method, applied in the production field of propylene oxide, can solve the problem of high energy consumption
Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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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 production method of propylene oxide is provided
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Embodiment 1
[0028] Such as figure 1 As shown, taking a 100,000-ton / year PO plant as an example, the raw materials cumene hydroperoxide 1 and fresh propylene 2 are reacted in reactor I to produce α,α-dimethylbenzyl alcohol, cumene, and cyclohexane. Liquid phase stream 3 of oxypropane, propylene and propane. Stream 3 is sent to high-pressure propylene recovery tower II for separation, and stream 4 is obtained at the top of the tower, and 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 III for separation, and stream 6 is obtained at the top of the tower, and crude propylene oxide product stream 8 from which propylene has been removed is obtained from the tower bottom. The propylene stream 6 recovered at the top of the low-pressure propylene recovery tower III is divided into two parts, and a part of the stream 7 enters the de-pro...
Embodiment 2
[0037] Same as [Example 1], except that the operating conditions are changed.
[0038] In liquid stream 3, the content of α,α-dimethylbenzyl alcohol is 26% by weight, the content of cumene is 21.5%, the content of propylene oxide is 10.5%, and the content of propylene is 39%. , The content of propane is 2%. The operating conditions of the high-pressure propylene recovery tower are: the operating pressure is 1.6MPa, the operating temperature at the top of the tower is 40°C, the operating temperature of the tower bottom is 87°C, and the number of theoretical plates is 25.
[0039] The operating conditions of the low pressure propylene recovery tower are as follows: operating pressure is 0.2MPa, tower top operating temperature is -20°C, tower bottom operating temperature is 120°C, and the number of theoretical plates is 20.
[0040] The operating conditions of the de-propanizer are as follows: operating pressure is 2.0MPa, operating temperature at the top of the tower is 51°C, operatin...
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Abstract
The invention relates to a production method of propylene oxide, which mainly solves the problem of high energy consumption in the prior art. The present invention comprises the following steps by adopting: a) cumene hydroperoxide and propylene react in a reactor to generate a liquid phase stream; b) the liquid phase stream enters a high-pressure propylene recovery tower, and the first light component stream is obtained at the top of the tower , the tower reactor obtains the first heavy component stream; b) the first heavy component stream enters the low-pressure propylene recovery tower, the tower top obtains the second light component stream, and the tower reactor obtains the second heavy component stream; c) the second The light component stream is divided into two parts, wherein a part of the stream enters the depropanizer, the top of the tower obtains the third light component stream, and the tower reactor obtains the third heavy component stream; d) the first light component stream, the second light component stream The technical scheme of removing the split part entering the depropanizer from the split stream and recycling the third light component stream back to the reactor solves this problem well, and can be used in the industrial production of propylene oxide.
Description
Technical field [0001] The invention relates to a production method of 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 production of propylene derivatives after polypropylene and acrylonitrile. It is mainly used to produce 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, light industry, medicine, food, textile and other industries, and have great influence on the development of chemical industry and national economy. profound influence. With the expansion of the use of propylene oxide and the increase in the amount of downstream products, the demand for the propylene oxide market is increasing. [0003] At present, the methods of industrial production of propylene oxide mainly include the chlorohy...
Claims
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