Efficient and safe adipic acid synthesis method

Abstract

The invention discloses an efficient and safe adipic acid synthesis method. The method comprises the following steps:raw materials containing a catalyst are fully mixed in a microchannel reactor; and the mixed material enters a falling film reactor, is heated to a reaction temperature, forms a liquid film after flow guiding, realizes adipic acid synthesis in the film, and the generated gas overflows from the surface of the film in time and then enters a tail gas post-treatment device through a gas phase pipeline. The micro-channel reactor is adopted to realize full mixing of raw materials at a lower temperature, the mixing process is liquid-liquid mixing (no gas is generated), the mixing effect is greatly superior to that of a kettle type and a tube type, the subsequent synthesis reaction is facilitated, the adipic acid synthesis reaction is completed in the falling film reactor, back mixing is avoided in the reaction process, and the specific surface area of a liquid film is large; and gas generated by the reaction overflows from the surface of the film in time, so that the reaction can be carried out forwards, the reaction yield and selectivity are high, continuous production of adipic acid is realized, the retention time is short, the reaction liquid holdup is low, the mixing effect is good, and the safety coefficient is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis applications, and specifically relates to a method for preparing adipic acid by using cyclohexanol / cyclohexanone as raw materials, fully mixing in a microchannel reactor, and performing oxidation reaction in a falling film reactor. Background technique [0002] Adipic acid, also known as fatty acid, is one of the most valuable dibasic acids among aliphatic dibasic acids. The application of adipic acid is mainly divided into two categories, namely nylon and non-nylon. The application of adipic acid in nylon products is mainly to manufacture nylon 66 salt (complex), polycondensation of nylon 66 salt to produce nylon 66 resin and nylon 66 fiber; the application in non-nylon is mainly to produce polyester polyol, and then produce Polyurethane products. In addition, adipic acid is also widely used in medicine, spices, pesticides, coatings, food, adhesives and dyes. The adipic acid process i...

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Problems solved by technology

[0006] The present invention aims at the insufficient mixing of raw materials during the continuous synthesis of adipic acid in kettle, local easy back-mixing and overheating, large reaction liquid holding capacity and high reaction risk; system gas volume in the reaction process of tubular reactor and microchannel reactor large, the gas cannot be discharged from the reaction system in time, the actual residence time is short, and the device is complicated. An efficient and safe adipic acid synthesis method is provided. When it is applied, the process uses a microchannel reactor to achieve sufficient raw materials at a lower temperature. Mixing, the mixing process is liquid-liquid mixing (no gas generation), the mixing effect is much better than the kettle type and tubular type, which is beneficial to the subsequent synthesis reaction; this process completes the adipic acid synthesis reaction in the falling film reactor, and there is no return during the reaction process Mixed, the specific surface area of ​​the liquid film is large, and the gas generated by the reaction overflows from the film surface in time, which is conducive to the positive reaction, and the reaction yield and selectivity are high; Low, good mixing effect, greatly improved safety factor

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