A method of continuously synthesizing hexanedioic acid through a microchannel reactor

A technology of microchannel reactor and adipic acid, which is applied in the field of continuous reaction technology, can solve the problems of high system pressure, low yield of adipic acid, gasification of cyclohexene, etc., to maintain the reaction temperature, increase the reaction rate, The effect of enhancing mass transfer
CN106380375AActive Publication Date: 2017-02-08CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU UNIV
Publication Date
2017-02-08

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Abstract

A method of continuously synthesizing hexanedioic acid through a microchannel reactor is disclosed and belongs to the technical field of organic synthesis processes. The method includes fully mixing hydrogen peroxide and a tungsten-containing catalyst, and pumping the mixture and cyclohexene which are two material streams into the microchannel reactor to continuously produce the hexanedioic acid, wherein a process of cyclohexene oxidation to prepare the hexanedioic acid is performed in two stages, namely a stage of oxidizing the cyclohexene into 1,2-cyclohexanediol and a stage of oxidizing the 1,2-cyclohexanediol into the hexanedioic acid. The method utilizes high mass transfer and heat transfer efficiencies of the microchannel reactor to effectively enhance the mass transfer speed between the two-phase materials, to stabilize the reaction temperature and to greatly improve experiment safety and operability. The reaction system is free of solvents, phase transfer catalysts and acid auxiliaries, thus reducing the production cost and facilitating separation and purification of the hexanedioic acid. The method allows efficient continuous production of the hexanedioic acid to be possible. The conversion ratio of the cyclohexene is 100%, and selectivity of the hexanedioic acid is 95.4%.
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Description

technical field

[0001] The invention belongs to the technical field of organic synthesis technology, and in particular relates to a continuous reaction technology for preparing adipic acid by oxidation of cyclohexene as a raw material. More specifically, the continuous oxidation of cyclohexene to 1,2-cyclohexanediol and 1,2-cyclohexanediol to adipic acid is realized in a microchannel reactor. Background technique

[0002] Adipic acid, also known as Adipic Acid, is one of the most valuable aliphatic dicarboxylic acids in industry. It is mainly used in the production of nylon 66 and nylon 66 engineering plastics, polyurethane foam and plasticizers. In addition, it can also be used to produce high-grade lubricating oil, food additives, pharmaceutical intermediates, plastic foaming agents, paints, insecticides, adhesives and dyes, etc., and has a wide range of uses.

[0003] At present, the main methods for industrial preparation of adipic acid are cyclohexane nitric acid oxida...

Claims

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