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Preparation method of epoxypropane

A technology of propylene oxide and epoxidation reaction, which is applied in the field of propylene oxide, can solve the problems of reducing reaction conversion rate and selectivity, difficulty in purifying PO products, catalyst precipitation, etc., to reduce moisture content, improve TBHP selectivity, Good response selectivity effect

Active Publication Date: 2021-06-08
北京水木滨华科技有限公司
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Problems solved by technology

Although the above two methods can improve the selectivity of TBHP in the isobutane oxidation product, they will bring additional water or alcohol in the oxidation product, which will bring serious adverse effects to the subsequent epoxidation reaction.
In the epoxidation reaction, too high water and alcohol content will lead to catalyst precipitation, reduce the conversion rate and selectivity of the reaction, and make the purification of PO products more difficult

Method used

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  • Preparation method of epoxypropane
  • Preparation method of epoxypropane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The fresh isobutane of 31.85kg / hr in the pipeline 11 is mixed with the reclaimed isobutane of 58.74kg / hr in the pipeline 22 and enters the peroxidation reactor 1 together with the oxygen of 14.17kg / hr in the pipeline 12. 71 Introduce 12.40 kg / hr of purified dehydrated TBA into reactor 1, the reaction temperature in peroxidation reactor 1 is 135°C, the pressure is 3.2 MPa, and the reaction residence time is 8.5 hr. The oxidation product is transferred to the isobutane recovery unit 2 through pipeline 13 at 115.17kg / hr, wherein the content of isobutane is 50.93wt%, the content of TBHP is 26.82wt%, and the content of TBA is 20.91wt%. In the peroxidation reaction unit 1, the conversion rate of IB was 33.00%, the selectivity of TBHP was 66.90%, and the selectivity of TBA was 31.15%.

[0063] In the isobutane recovery tower 2, the temperature at the bottom of the tower is 91.98° C., the temperature at the top of the tower is -7.18° C., and the pressure at the top of the tower...

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Abstract

The invention provides a preparation process of epoxypropane. Compared with the prior art, the byproduct TBA in the system is purified and dehydrated and then returns to the peroxidation reactor to react with isobutane and oxygen, so that the selectivity of TBHP in the product can be greatly improved, and the amount of TBA generated in the reaction is reduced. After isobutane is removed from an oxidation reaction product, purified and dehydrated TBA is added for azeotropic distillation, so that the moisture content in the TBHP solution is effectively reduced, and the subsequent epoxy reaction is ensured to obtain higher reaction conversion rate and better reaction selectivity. Compared with the prior art, more epoxypropane can be produced under the same consumption of isobutane, and the economic benefit of a PO / TBA co-oxidation route is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of propylene oxide, and in particular relates to a method for preparing propylene oxide by a co-oxidation method. Background technique [0002] Propylene oxide is a very important organic compound raw material, and it is the third largest propylene derivative after polypropylene and acrylonitrile. Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for the production of polyurethane foams, insulation materials, elastomers, adhesives and coatings, and various Nonionic 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] The existing commercial propylene oxide preparation processes mainly include chlorohydrin method, co-oxidation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/19C07D301/32C07D303/04C07C29/50C07C29/48C07C29/80C07C29/82C07C31/12C07C407/00C07C409/04
CPCC07D301/19C07D301/32C07D303/04C07C29/50C07C29/48C07C29/80C07C29/82C07C407/00C07C407/003C07C31/12C07C409/04Y02P20/52
Inventor 马敏王春玲解淑民门永彪郑虓
Owner 北京水木滨华科技有限公司