Device and method for cyclohexanone rectification

Abstract

The invention discloses a device and a method for cyclohexanone rectification. The device comprises a first light component column, a first cyclohexanone column, a second light component column, and a second cyclohexanone column, wherein an afterheat reboiler is arranged at the column bottom of the first cyclohexanone column. The method comprises the following steps: introducing cyclohexanone / cyclohexanol impurity-containing mixture into a first light component column, introducing the column top outflow of the first light component column into the afterheat reboiler, carrying out heat exchange on the column bottom material of the first cyclohexanone column, mixing the outflow and the condensate of the non-condensed gas, introducing into the reflux inlet of the first light component column and the feed inlet of the second light component column respectively, collecting lightweight oil from the column top of the second light component column, introducing the column bottom outflow of the second light component column into the feed inlet of the second cyclohexanone column, collecting solvent-grade cyclohexanone from the column top of the second cyclohexanone column, introducing the column bottom outflow of the first light component column and he second cyclohexanone column into the feed inlet of the first cyclohexanone column, and collecting chemical fiber-grade cyclohexanone from the column top of the first cyclohexanone column. The device disclosed by the invention is low in energy consumption, and the obtained cyclohexanone product has high quality. The method disclosed by the invention has simple process and good stability.

Description

technical field [0001] The invention relates to a rectification device and method, in particular to a rectification device and method of cyclohexanone. Background technique [0002] Cyclohexanone is an important chemical raw material, mainly used in the production of caprolactam and adipic acid, and a small amount is used as a solvent. With the development of the domestic economy, the domestic consumption of caprolactam and adipic acid has increased significantly, and the consumption of cyclohexanone has also increased significantly. The development and utilization prospects are broad. [0003] The current methods for preparing cyclohexanone mainly include cyclohexane oxidation and cyclohexene hydration. [0004] The cyclohexane oxidation method mainly uses air oxidation of cyclohexane to obtain a mixture of cyclohexanone, cyclohexanol and other impurities through decomposition, saponification and alkane rectification, and then the mixture is separated by rectification to o...

AI Technical Summary

Problems solved by technology

However, due to the use of the cyclohexane raw material produced by the partial hydrogenation of benzene, the content of methylcyclopentanone in the existing cyclohexanone refining feed increases, and the microscopic quality of the chemical fiber grade cyclohexanone used in the production of caprolactam is relatively high. However, the requirements are getting higher and higher, so that in the original process, the reflux ratio of rectification can only be increased to improve the purity of cyclohexanone, resulting in an increase in the energy consumption of the overall rectification system, and the quality of the product cyclohexanone cannot be stably controlled.

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