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Method for preparing propylene oxide using microchannel reactor

A microchannel reactor, propylene oxide technology, applied in chemical instruments and methods, chemical/physical/physical chemical reactors, organic chemistry, etc., can solve the problem of easy deactivation of catalysts, low utilization rate of raw material propylene, and many by-products. and other problems, so as to reduce the operating burden, improve the mixing efficiency of raw materials, and improve the utilization rate.

Active Publication Date: 2019-05-03
HONGBAOLI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is that in the existing technology for producing propylene oxide, the utilization rate of raw material propylene is low, there are many by-products, the catalyst is easily deactivated, etc., and it is difficult to meet the development needs of the current PO industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add cumene hydroperoxide material (cumene hydroperoxide mass concentration is 50%, solvent is cumene), microporous titanium silicon molecular sieve catalyst (catalyst molecular formula (TiO 2 ) 0.1 (SiO 2 ) 0.9 ), the mass ratio of cumene hydroperoxide to the catalyst is 1:0.002, start stirring, and stir at a high speed under normal temperature, so that the catalyst is evenly dispersed in the cumene hydroperoxide material to obtain a mixed solution; mix the mixed solution with propylene (propylene Content is 80vol%) material is passed into microchannel reactor continuously, and wherein the feed molar ratio of cumene hydroperoxide and propylene is 1:5.9, and material carries out epoxidation reaction in reactor channel and generates propylene oxide and dimethyl Base benzyl alcohol, the reaction temperature is 60 ℃, the pressure is 2.1MPa, the residence time is 20s, the reaction product is obtained, and the aldehyde content in the reaction product is 25ppm. The reaction...

Embodiment 2

[0027] Add cumene hydroperoxide material (cumene hydroperoxide mass concentration is 50%, solvent is cumene), microporous titanium silicon molecular sieve catalyst (catalyst molecular formula (TiO 2 ) 0.05 (SiO 2 ) 0.95 ), the mass ratio of cumene hydroperoxide to the catalyst is 1:0.01, start stirring, and stir at a high speed at room temperature, so that the catalyst is evenly dispersed in the cumene hydroperoxide material to obtain a mixed solution; mix the mixed solution with propylene (propylene Content is 90vol%) material is passed into microchannel reactor continuously, and wherein the feed molar ratio of cumene hydroperoxide and propylene is 1:5.3, and material carries out epoxidation reaction in reactor channel and generates propylene oxide and dimethyl Base benzyl alcohol, the temperature in the channel is 75°C, the pressure is 1.1MPa, and the residence time is 30s, the reaction product is obtained, and the aldehyde content in the reaction product is 42ppm. The ga...

Embodiment 3

[0029] Add cumene hydroperoxide material (cumene hydroperoxide mass concentration is 50%, solvent is cumene), mesoporous titanium silicon molecular sieve catalyst (catalyst molecular formula (TiO 2 ) 0.1 (SiO 2 ) 0.9 ), the mass ratio of cumene hydroperoxide to the catalyst is 1:0.005, start stirring, and stir at a high speed under normal temperature, so that the catalyst is evenly dispersed in the cumene hydroperoxide material to obtain a mixed solution; mix the mixed solution with the propylene material ( Propylene content is 90vol%) continuously into the microchannel reactor, wherein the feed molar ratio of cumene hydroperoxide and propylene is 1:1.5, and the material carries out epoxidation reaction to generate propylene oxide and dimethyl in the reactor channel Base benzyl alcohol, the temperature in the channel is 80°C, the pressure is 0.9MPa, and the residence time is 40s, the reaction product is obtained, and the aldehyde content in the reaction product is 38ppm. Th...

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Abstract

The invention discloses a method for preparing propylene oxide by utilizing a micro-channel reactor. The method comprises the following steps: uniformly stirring a cumyl hydroperoxide material and a catalyst at room temperature to obtain a mixed solution; conveying the mixed solution and a propylene material into the micro-channel reactor and reacting to obtain a crude product; separating and purifying the crude product to obtain a target product. According to the method disclosed by the invention, the mixing efficiency of the raw materials can be greatly improved and the occurrence of side reactions is reduced; the conversion ratio of the cumyl hydroperoxide and the selectivity of the propylene oxide are improved; meanwhile, the propylene utilization rate is effectively improved and the feeding amount of the propylene is reduced; the reaction is safe, rapid and effective and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for synthesizing propylene oxide, in particular to a method for preparing propylene oxide using a microchannel reactor. Background technique [0002] Propylene oxide (PO) is one of the important derivatives of propylene and an important organic chemical raw material. Since epoxides contain a three-membered cyclic ether structure and have a large surface tension, they have high reactivity. Its biggest use is as the main raw material to produce polyether polyol, propylene glycol and various nonionic surfactants. At present, PO has been widely used in various industries such as chemical industry, medicine, food and textile. The traditional production methods of PO include chlorohydrin method and co-oxidation method. The main raw materials of the chlorohydrin method are propylene, chlorine gas, quicklime and water. First, chlorine gas, water and propylene undergo a chlorohydrinization reaction to generate intermediate ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/19B01J19/00
CPCB01J19/0093C07D301/19C07D303/04
Inventor 黄东平邢益辉熊丽媛余渡江范春元
Owner HONGBAOLI GRP CO LTD