Technology and device for recycling chloroethylene high-boiling substance

Abstract

The invention relates to a technology and a device for recycling a chloroethylene high-boiling substance. The technology includes following successive steps: recycle of chloroethylene, recycle of dichloroethane and recycle of trichloroethane. By means of two padding rectification columns, including a chloroethylene separation column and a low-boiling column, and accessory devices thereof, a chloroethylene gas and a high-purity 1,1-dichloroethane liquid are separated respectively under a normal pressure condition and a pressurized condition, so that all components in the chloroethylene high-boiling substance are fully extracted. The technology is carried out in a sealed system, is free of generation of waste residue and waste water and is environmental-protective, safe and reliable. A required heating temperature is low so that the technology can be carried out through waste hot water and waste hot steam. The technology is low in energy consumption, is less in controlling points and is simple in operation. Through rectification to a residual liquid generated during a producing process, different materials having utilization values are obtained. The method can reduce environmental pollution and has a significant economic benefit.

Description

technical field [0001] The invention relates to a recovery process and equipment suitable for high boilers of vinyl chloride, in particular to a recovery process and equipment for high boilers of vinyl chloride, belonging to the technical field of polyvinyl chloride production. Background technique [0002] In the process of producing polyvinyl chloride by calcium carbide method, while acetylene and hydrogen chloride react in the converter to form vinyl chloride, dichloroethane, acetaldehyde, dichloroethylene, trichloroethylene, trichloroethane and other high boiling point organic compounds. [0003] Vinyl chloride (referred to as VCM) high boiler main components and content: 1,1-dichloroethane 51% ~ 53%, trans 1,2-dichloroethylene 16% ~ 20%, cis 1,2-dichloroethylene Vinyl chloride 3%~4%, vinylidene chloride 0.2%~0.6%, trichloroethylene 0.3%~0.45%, 1,1,2-trichloroethane 9%~10%, vinyl chloride 16%~20% . [0004] Most of the substances contained in the raffinate are poisono...

AI Technical Summary

Problems solved by technology

[0005] At present, the recovery of high boilers of vinyl chloride mainly uses the vertical sieve plate rectification column to separate vinyl chloride gas for recovery. The main problems are: the separation effect of vinyl chloride is poor, a large amount of vinyl chloride remains in the liquid, and the produced 1,1 The product of dichloroethane has low purity, poor separation effect of high boiling substances, large amount of waste discharge, and great pollution to the environment

Images