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Method for preparing epoxypropane by catalyzing propylene epoxidation with phase-transfer catalyst under reaction control

A technology for controlling phase transfer and propylene oxide, which is applied in organic chemistry and other fields, can solve problems such as process flow description, and achieve the effect of simple process, easy operation and mild reaction conditions

Active Publication Date: 2014-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The above-mentioned patents all describe the epoxidation reaction process, but do not explain the entire process flow. In order to achieve continuous production, the entire process needs to be designed

Method used

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  • Method for preparing epoxypropane by catalyzing propylene epoxidation with phase-transfer catalyst under reaction control
  • Method for preparing epoxypropane by catalyzing propylene epoxidation with phase-transfer catalyst under reaction control

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Embodiment 1

[0028] Such as figure 1 As shown, the solvent in the hydrogen peroxide dehydration tower T1 is a 1:1 equal-volume mixture of toluene and trioctyl phosphate, the feed flow rate is 5.0 kg / h, the feed flow rate of 35% hydrogen peroxide is 2.0 kg / h, and the catalyst feed rate is 0.4 kg / h. The hydrogen peroxide dehydration process conditions of tower T1 are as follows: the temperature at the bottom of the tower is 45°C, the condensation temperature at the top of the tower is -5°C, and the pressure is 1000Pa.

[0029] The reaction liquid obtained from T1 is transported to the continuous tank reactor R1 at 6.0kg / h and propylene at 0.5kg / h. The reaction conditions of the continuous tank reactors R1 and R2 are as follows: the reaction temperature is 85°C, and the reaction pressure is 4.25Mpa. The reaction space velocity is 4h -1 . After the reaction of R2, the material passes through the condensation filter tower T2, and the circulating reaction liquid containing the catalyst is ref...

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Abstract

A process for preparing epoxypropane by catalyzing propylene epoxidation with a phase-transfer catalyst under reaction control comprises a hydrogen peroxide dehydration part, a reaction part, a separation part, and a tail gas treatment part. Phosphotungstic heteropoly acid quaternary ammonium salt is used as a catalyst; an anhydrous H2O2 organic solvent produced by azeotropic dehydration of hydrogen peroxide and an organic solvent is used as an oxidizing agent; and propylene epoxidation is carried out at 40-160 DEG C and 0.25-10.0 MPa in the presence of inert gas to prepare epoxypropane. The process provided in the invention realizes continuous production of epoxypropane by catalyzing propylene epoxidation with a phase-transfer catalyst, is simple and easy to operate, and is mild in reaction conditions.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a process for preparing propylene oxide by catalyzing the epoxidation of propylene with a reaction-controlled phase transfer catalyst. Background technique [0002] Propylene oxide (PO) is an important basic 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 in the production of polyurethane, unsaturated resins and surfactants. [0003] The existing industrial production methods include chlorohydrin method and co-oxidation method. The biggest disadvantage is the corrosion of the equipment and heavy pollution. If 1 ton of propylene oxide is produced, about 50 to 80 tons of wastewater containing calcium chloride will be produced. At present, most domestic propylene oxide production enterprises adopt this method. The co-oxidation method using is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/12
CPCC07D301/12C07D303/04
Inventor 高爽张毅赵公大张恒耘吕迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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