Process for scavenging free chlorine in an ethylene dichloride s

Details Process for scavenging free chlorine in an ethylene dichloride s Process for scavenging free chlorine in an ethylene dichloride s

1984-04-27

1985-10-15

Warren, Charles F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570254, 570262, 204163R, C07C 1706

Patent

active

045475997

ABSTRACT:
A trace amount of free chlorine, present along with comparable amounts of ethylene, oxygen and water vapor in the ethylene dichloride (EDC) effluent from a direct chlorination reactor, may be effectively scavenged by exposing the effluent to ultraviolet ("u-v") light having a wavelength less than about 4000.ANG. which is absorbed by the chlorine, but to which both ethylene and EDC are essentially transparent. In this process, contaminant chlorine in substantially pure (99..sup.+ %) EDC is catalytically activated and reacts with EDC to form an unwanted byproduct, namely 1,1,2-trichloroethane ("triane"). The process is effective in either the gaseous phase or the liquid phase.

REFERENCES:
patent: 3629085 (1971-12-01), Coppens
patent: 4347391 (1982-08-01), Campbell

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