Rectification tower of 1,4-butanediol raffinate recovery system

Abstract

The invention discloses a rectification tower of a 1,4-butanediol raffinate recovery system, and belongs to the technical field of chemical product rectification equipment. The rectification tower comprises a tower body, multiple stages of filling sections, an overhead gas outlet, a reflux inlet, a feed inlet, a reboiler return port, a tower bottom discharge outlet, and a reboiler communication port. A groove-type liquid distributor is arranged at the top of a first filling material section of the multistage filling material section unit. A collection tank-type liquid distributor is arranged between each two of the multiple stages of filling section. The rectification tower of a 1,4-butanediol raffinate recovery system has a recovery rate reaching above 90%, alleviates the situation of short supply of 1,4-butanediol on the domestic market, solves the problem of foreign market foreclosure, and greatly improves a resource utilization rate.

Description

technical field [0001] The invention relates to a rectification tower, which belongs to the technical field of rectification equipment for chemical products. Background technique [0002] 1,4-butanediol raffinate is a waste liquid produced in the process of removing residues in the 1,4-butanediol rectification section. The main components of the waste liquid are 1,4-butanediol, pentene Alcohol, 4-hydroxybutyraldehyde, M-BID, etc., of which the content of 1,4-butanediol is more than 70%. Since 1,4-butanediol is a high-tech fine chemical raw material, the market price is about 15,000 yuan / ton, and its downstream products have high quality requirements, and the purity generally requires more than 99.5%, so the waste Liquid has no market space in its high-end downstream products. At present, this part of waste liquid of our company can only be sold to low-end customers at a price of about 800 yuan per ton. On the one hand, it causes economic losses to the enterprise and wa...

AI Technical Summary

Problems solved by technology

At present, this part of waste liquid of our company can only be sold to low-end customers at a price of about 800 yuan per ton. On the one hand, it causes economic losses to the company and wastes resources.

[0003] The recovery technology of 1,4-butanediol raffinate was born because of this. The adopted process is rectification. The key technology is to design a reasonable rectification tower, because the impurity M-PID in the raffinate is different from the boiling point of 1,4-butanediol. It is quite close and forms an azeotrope. The high purity requirement cannot be achieved by conventional distillation methods. At present, there is no rectification column specially designed for the recovery of 1,4-butanediol raffinate

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