Device and process for separating and reclaiming difluoro-monochloroethane during production of monofluoro-dichloroethane

Abstract

The invention discloses a device and process for separating and reclaiming difluoro-monochloroethane during production of monofluoro-dichloroethane. The device comprises a cooling tower, a cooling tower kettle, a monofluoro-dichloroethane reclaiming groove, a water groove, a water circulating pump, a water cooler and a de-foaming device. Cooling tower kettle liquid is circularly washed and cooled by circulating water of which the temperature is 5 to 10 DEG C; after being cooled, the monofluoro-dichloroethane of which the boiling point is 32 DEG C is layered by the cooling tower kettle, and the monofluoro-dichloroethane and water are in the lower layer and the upper layer respectively; the water is in the upper layer and overflows to the water groove; after being cooled by the water cooler, the water in the water groove is circulated by the circulating pump; the monofluoro-dichloroethane is discharged from the bottom of the cooling tower kettle to be reclaimed into the monofluoro-dichloroethane reclaiming groove; the difluoro-monochloroethane of which the boiling point is 9.8 DEG C below zero is delivered to the de-foaming device from a gas phase outlet in the top of the cooling tower; the separated water flows back to the cooling tower through a counter flow pipe; and the difluoro-monochloroethane is reclaimed into a reclaiming system through the de-foaming device. The monofluoro-dichloroethane can be reclaimed, a fluorocarbon resource is fully utilized, and the service life of a reclaiming compressor of the difluoro-monochloroethane is also prolonged.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a fluorine chemical production device and process, in particular to a device and process for separating and recovering difluoro-chloroethane in the production of 1-fluoro-2-chloro-ethane. Background technique [0002] The existing process for producing fluorodichloroethane (F141b) can generate vinyl chloride or vinyl fluoride by catalyzing the addition reaction of acetylene and hydrogen chloride or hydrogen fluoride, and then catalyze the further addition of vinyl chloride and hydrogen fluoride or vinyl fluoride and hydrogen chloride to form a Fluorochloroethane, and finally fluorodichloroethane can be prepared by catalyst or ultraviolet photocatalyzed substitution reaction of monofluorochloroethane and chlorine. In the production process, there will be a by-product difluoro-chloroethane (F142b). When the by-product difluoro-chloroethane is post-treated, a large amount of monoflu...

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Problems solved by technology

In the production process, there will be a by-product difluoro-chloroethane (F142b). When the by-product difluoro-chloroethane is post-treated, a large amount of monofluoro-dichloroethane and water will be entrained after washing, which will be brought to the following In the recovery system, a large amount of liquid causes a serious burden to the recovery compressor of difluoro-dichloroethane, which reduces the service life of the recovery compressor, and also affects the treatment system of the post-plant section, which separates monofluoro-dichloroethane for post-processing And the separation device of difluorochloroethane brings a lot of pressure

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