Decarboxylation device for process using adipic acid to prepare cyclopentanone

Abstract

The invention discloses a decarboxylation device for a process using adipic acid to prepare cyclopentanone and belongs to the field of chemical equipment. The decarboxylation device comprises a dissolving kettle, wherein the dissolving kettle is communicated with a reaction kettle through a first pipeline provided with a first valve; the reaction kettle is communicated with the inlet of a circulating pump through a second pipeline provided with a second valve; the outlet of the circulating pump is communicated with the bottom end of a vertical fixed-bed reactor through a third pipeline, and the lateral side of the fixed-bed reactor is communicated with the reaction kettle through a fourth pipeline; the top of the fixed-bed reactor is communicated with a receiver through a fifth pipeline provided with a condenser; a thermal insulating layer wraps each of the first pipeline, the second pipeline, the third pipeline, the fourth pipeline and the fixed-bed reactor. The decarboxylation device is simple in structure, convenient to operate, high in adipic acid conversion rate and high in cyclopentanone separation rate.

Description

technical field [0001] The invention relates to the field of chemical equipment, in particular to a decarboxylation device for preparing cyclopentanone from adipic acid. Background technique [0002] At present, the domestic cyclopentanone production enterprises all adopt the heat conduction oil electric heating method. After the adipic acid is melted, it is added to the reactor, and then the catalyst is added. The heat conduction oil in the jacket of the reactor is directly heated, and the temperature in the reactor reaches 250°C-260°C. ℃, the temperature of the heat transfer oil reaches 280℃-290℃. [0003] [0004] Cyclopentanone is a colorless liquid at room temperature, with a melting point of -58°C and a boiling point of 130.6°C. Adipic acid is a white crystal at room temperature with a melting point of 152°C. [0005] The disadvantages of this method are: [0006] 1. The decarboxylation cycle of adipic acid is long, which is not conducive to the production capa...

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Problems solved by technology

[0006] 1. The decarboxylation cycle of adipic acid is long, which is not conducive to the production capacity of the equipment; adipic acid is exposed to high temperature for a long time, and part of the carbonization reduces the conversion rate of adipic acid and increases the production cost;

[0007] 2. After the reaction, the catalyst is released with the tar at the bottom of the tank, which cannot be recovered, which increases the production cost

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