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A kind of preparation method of propylene oxide

A technology of propylene oxide and epoxidation reaction, which is applied in the field of propylene oxide, can solve the problems of increased TBHP content, hidden dangers of incineration and other safety hazards, and achieve the effect of increasing the reaction rate

Active Publication Date: 2022-07-29
CENWAY TECHNOLOGY CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In the epoxidation reaction of propylene and TBHP, propylene is excessive, and the conversion rate of TBHP is usually required to be greater than 99%. On the one hand, it is based on process requirements, high TBHP conversion rate, and more PO is obtained; on the other hand, it is based on process safety requirements , if there are many TBHP residues in the reaction process, the TBHP content in the post-treatment waste liquid will increase, which will bring safety hazards to incineration treatment, etc.

Method used

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  • A kind of preparation method of propylene oxide

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preparation example Construction

[0039] The preparation method of the present invention will be described in further detail below with reference to specific examples. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies implemented based on the above content of the present invention are covered within the intended protection scope of the present invention.

[0040] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents, materials, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0047] 150.00g of the primary epoxidation product tower bottom heavy component in Comparative Example 1 was added to the rectifying tower, and concentrated by vacuum rectification. A total of 34.8 g of TBA and some impurities are extracted from the top of the tower, of which the content of acetone is 0.88 wt % and the content of water is 0.98 wt %. The tower still produced 115.0 g of heavy components in the tower still, wherein the content of TBHP was 7.46 wt %, the content of acetone was 0.017 wt %, and the content of water was 0.20 wt %.

[0048] Add 115.00g of the above-mentioned tower reactor components to a 1L stainless steel reaction kettle, then add 25.12g of propylene, heat up to control the reaction temperature at 134°C, and react for 34 minutes. The content of TBHP is 0.23wt% and the content of PO is 3.59wt% by sampling and analysis. .

[0049] After calculation, the conversion rate of the secondary epoxidation reaction TBHP was 96.2%, and the selectivity of PO was ...

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Abstract

The invention provides a preparation method of propylene oxide. The method is to carry out the concentration treatment of tert-butyl hydroperoxide on the material after the primary epoxidation reaction. PO is separated, and then rectification is used to increase the concentration of TBHP in the reaction system. Specifically, by reducing TBA, increasing the concentration of TBHP and catalyst, the epoxidation reaction rate is improved; the most important thing is that the primary epoxidation reaction can also be After the produced acetone and water are separated, the secondary epoxidation reaction is carried out, which improves the reaction rate and the selectivity of PO.

Description

technical field [0001] The invention belongs to the technical field of propylene oxide, and particularly relates to a preparation method of propylene oxide. Background technique [0002] Propylene oxide is a very important organic compound raw material, and is the third largest propylene derivative after polypropylene and acrylonitrile. Propylene oxide is mainly used in the production of polyether polyol, propylene glycol and various nonionic surfactants, among which polyether polyol is an important raw material for the production of polyurethane foam, thermal insulation materials, elastomers, adhesives and coatings, etc. Ionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. At the same time, propylene oxide is also an important basic chemical raw material. [0003] In the existing technology, often use ethylbenzene, isobutane or cumene oxidative oxidation to prepare organic peroxide such as ethylbenzene hydroper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/19C07D301/32C07D303/04
CPCC07D301/19C07D301/32C07D303/04Y02P20/52
Inventor 马敏代俊明解淑民朱德权杨灿
Owner CENWAY TECHNOLOGY CO LTD