Continuous separation device for p-benzoquinone crystals

Abstract

The invention relates to a continuous separation device for p-benzoquinone crystals. The continuous separation device comprises a crystallizing kettle, a cyclone separator, a horizontal centrifuge and a PLC (Programmable Logic Controller) control circuit. The continuous separation device has the advantages of energy conservation, environment friendliness and high production efficiency; a mixed liquid containing the p-benzoquinone crystals is subjected to warming, stirring and shock cooling by virtue of the crystallizing kettle so as to generate products, the products are conveyed to the cyclone separator through a discharging pipe of the crystallizing kettle, the mixed liquid containing the high-concentration crystals is conveyed to the horizontal centrifuge from the bottom of the cyclone separator and is subjected to solid-liquid separation, a p-benzoquinone mother solution is conveyed to a water film generator at the upper part of a p-benzoquinone stripping tower from the top of the cyclone separator or returns into the crystallizing kettle, and a mother solution separated by the horizontal centrifuge returns into the crystallizing kettle as well; the processes are continuously and circularly carried out, so that the continuous separation of the p-benzoquinone crystals and the cycle use of the mother solution can be finished, and the outward draining is avoided. According to the continuous separation device, the problems that an existing device cannot continuously work and is low in efficiency are well solved, and the continuous separation device has excellent economic and social benefits.

Description

technical field [0001] The invention relates to a chemical equipment, in particular to a p-benzoquinone crystallization continuous separation equipment. Background technique [0002] Benzoquinone is a kind of quinone. Molecular formula C6H4O2, there are two kinds of o-benzoquinone and p-benzoquinone. P-benzoquinone is more important and can be used as dye and pharmaceutical intermediate, rubber anti-aging agent, polymerization inhibitor, antioxidant, developer, etc. [0003] The traditional production method of p-benzoquinone is the oxidation method, and the finished product of p-benzoquinone is prepared by stripping aniline oxidation solution with atmospheric pressure steam. The design of the existing p-benzoquinone extraction equipment is not reasonable enough. It needs to use a large amount of crystallization water when it works, and discharges more mother liquor and pollutants. The crystallization kettle is often operated intermittently, and crystallization is carried ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a continuous separation equipment for p-benzoquinone crystallization, so as to improve the technical problems such as unreasonable structure of the existing equipment, more pollutant discharge, non-continuous operation of the stripping tower, and low production efficiency.

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