External micro-interface strengthening system and method for preparing cyclohexanone by esterification method

Abstract

The invention provides an external micro-interface strengthening system for preparing cyclohexanone by an esterification method. The external micro-interface strengthening system comprises an esterification reactor; the side wall of the esterification reactor is provided with a raw material inlet; the raw material inlet is connected with a micro-interface generator, so that gas can be dispersed and crushed into bubbles; a reactant outlet is connected with an ethanol rectifying tower, so that ethanol in reactants can be separated out; a heavy component outlet is formed in the bottom of the ethanol rectifying tower and is connected with a cyclohexanol rectifying tower, so that gas-phase cyclohexanol can be separated out; a gas-phase outlet is formed in the top of the cyclohexanol rectifyingtower and is connected with a dehydrogenation reactor, so that cyclohexanol dehydrogenation reaction can be carried out. According to the external micro-interface strengthening system, after the raw material inlet is connected with the micro-interface generator, the mass transfer area between hydrogen and cyclohexyl acetate is increased, the mass transfer efficiency between a gas phase and a liquid phase is improved, so that the reaction efficiency is improved, and the production cost of an enterprise is reduced; and meanwhile, the temperature and the pressure of esterification reaction are reduced, and the safety and the stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of micro-interface strengthening reaction, and in particular relates to an external micro-interface strengthening system and method for preparing cyclohexanone by an esterification method. Background technique [0002] Cyclohexanone is an important organic chemical raw material. In my country, 65% of cyclohexanone is used as a raw material for the production of caprolactam, 20% of cyclohexanone is used as a raw material for the production of adipic acid, and the rest of cyclohexanone is used as a related chemical raw material ; In addition, cyclohexanone is also an excellent solvent and can be used as a solvent for paint nitrocellulose, vinyl chloride polymers and copolymers. With the rapid development of my country's chemical fiber industry, the production of caprolactam and adipic acid has increased year by year, and the demand for cyclohexanone has also increased day by day, so the development and utilizat...

AI Technical Summary

Problems solved by technology

However, although the preparation of cyclohexanone by esterification has obvious technological advantages, there are also some defects: on the one hand, the mass transfer area of ​​the gas-liquid phase of the existing esterification reactor is limited, and in the reaction process, cyclohexyl acetate and The hydrogen cannot be fully mixed, the mass transfer efficiency between the gas and liquid phases is low, and the reaction efficiency is low. On the other hand, the temperature and pressure of the esterification reaction are high, which greatly reduces the safety and stability of the system.

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