Method for preparing propylene oxide in microchannel reactor

A technology of microchannel reactor and propylene oxide, which is applied in chemical instruments and methods, chemical/physical/physical chemical reactors, organic chemistry, etc., can solve problems such as low conversion rate and selectivity, and explosion hazard, and achieve High conversion rate and selectivity, improved utilization, and short diffusion path

Active Publication Date: 2020-07-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is that there are problems of explosion hazard, low conversion rate and selectivity in the prior art, and a new method for preparing propylene oxide in a microchannel reactor is provided

Method used

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  • Method for preparing propylene oxide in microchannel reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The propylene oxide synthesis method uses hydrogen, oxygen, and propylene as gas phase raw materials, nitrogen as a diluent gas, and does not use a liquid phase carrier. The microchannel reactor is made of polymethyl methacrylate. The cross section of the microchannel is square, with a side length of 200 microns and a length of 1 cm. The amount is 0.05% (w / w).

[0030] The whole set of equipment is at room temperature (about 20°C). The gas source in the laboratory test is a gas cylinder. The gas is decompressed to 0.1MPa through a pressure reducing valve, and the flow is controlled by a mass flow meter. Then enter the microchannel chip reaction unit. The product flowing out from the chip is separated from gas and liquid after cooling. The flow rates of the four gases in the gas phase entering the reaction zone are H 2 :O 2 :C 3 h 6 :N 2 =5sccm:5sccm:5sccm:10sccm, the corresponding volume ratio is 20:20:20:40. Where sccm is milliliters per minute under standard c...

Embodiment 2

[0033] According to the conditions and steps described in Example 1, the microchannel reactor is made of polymethyl methacrylate, the microchannel section is rectangular, 500 microns long, 200 microns wide, and 1 cm in length, and the inside is completely filled with The nano-Au catalyst loaded on the TS-1 carrier, the loading amount is 1% (w / w).

[0034] The whole set of equipment is at 100°C. The gas source in the laboratory test is a gas cylinder. The gas is decompressed to 0.5MPa through a pressure reducing valve, and the flow is controlled by a mass flow meter. Channel Chip Reaction Unit. The product flowing out from the chip is separated from gas and liquid after cooling. The flow rates of the four gases in the gas phase entering the reaction zone are H 2 :O 2 :C 3 h 6 :N 2 =5sccm:5sccm:5sccm:10sccm, the corresponding volume ratio is 20:20:20:40.

[0035] The conversion rate of propylene was 8.2% and the selectivity of propylene oxide was 91.5% as measured by an o...

Embodiment 3

[0037] According to the conditions and steps described in Example 1, the microchannel reactor is made of stainless steel grade SS316L. The cross section of the microchannel is an equilateral triangle with a side length of 200 microns and a length of 1 cm. The interior is completely filled with TS- 1 Nano-Au catalyst on a carrier with a loading of 5% (w / w).

[0038] The whole set of equipment is at about 300°C. The gas source in the laboratory test is a gas cylinder. The gas is decompressed to 1MPa through a pressure reducing valve, and the flow is controlled by a mass flow meter. Channel Chip Reaction Unit. The product flowing out from the chip is separated from gas and liquid after cooling. The flow rates of the four gases in the gas phase entering the reaction zone are H 2 :O 2 :C 3 h 6 :N 2 =5sccm 5sccm:5sccm:10sccm, the corresponding volume ratio is 20:20:20:40.

[0039] The conversion rate of propylene was 5.6% and the selectivity of propylene oxide was 84.3% as me...

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Abstract

The invention relates to a method for preparing epoxypropane in a microchannel reactor. The method mainly solves the problems of existence of explosive danger, low conversion rate and low selectivity in the prior art. The technical scheme is as follows: by adopting the method for preparing epoxypropane in a microchannel reactor, gas-phase propylene contacts hydrogen peroxide generated by hydrogen and oxygen in-situ compounding in the microchannel reactor to directly generate the epoxypropane under the action of a catalyst; and propylene and oxygen directly react under the action of a catalyst to generate the epoxypropane, the epoxypropane is collected at the lower reach of the microchannels in the liquid-phase form, and the unreacted gas cyclically enters the microchannel reactor inlet or is evacuated after being diluted. The microchannel reactor comprises at least one microchannel, wherein the sectional dimension of each microchannel is 1 micrometer-1 centimeter, and the sectional dimensions of the microchannel in positions of different lengths are identical or different; and the catalyst is positioned in at least one part of the axial length of the microchannel. The technical scheme well solves the problems, and can be used for preparing epoxypropane.

Description

technical field [0001] The invention relates to a method for preparing propylene oxide in a microchannel reactor. Background technique [0002] Propylene oxide is the third largest propylene derivative except polypropylene and acrylonitrile. It is an important basic organic chemical raw material, and the current annual output in the world is more than 7 million tons. Propylene oxide is mainly used to produce polyether polyol and propylene glycol. Polyether polyol is the precursor of polyurethane, an important raw material. Propylene glycol is a raw material for the production of cosmetics, lubricating oil additives, and unsaturated polyester resin building materials. [0003] At present, the synthesis techniques of propylene oxide include: chlorohydrin method, co-oxidation method, cumene oxidation method, hydrogen peroxide direct oxidation method (HPPO method) and oxygen direct oxidation method. Among them, the first four have achieved industrial production, and the direct ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/08B01J19/00
CPCB01J19/0093B01J2219/00873B01J2219/00889C07D301/08C07D303/04Y02P20/52
Inventor 孙冰石宁徐伟姜杰
Owner CHINA PETROLEUM & CHEM CORP
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