LOW TEMPERATURE CATALYTIC COMBUSTION OF CHLORO-HYDROCARBONS

摘要

1506237 Oxyhydrochlorination B F GOODRICH CO 23 May 1975 [22 July 1974] 22529/75 Heading C2C Chlorinated derivatives of ethylene are produced by oxyhydrochlorination of ethylene or a chlorinated ethylene derivative; separating in a stream from the process anyunwanted chlorinated ethylene derivatives and other byproducts; injecting the stream into a combustion catalyst bed comprising 0À01-0À5% by weight of Pt or Pd and 99À99-99À50% by weight of Al 2 O 3 and/or SiO 2 having a surface area of #50 sq.m./g. and being non-friable and resistant to attrition; injecting O 2 -containing gas containing #2 moles of O 2 per mole of C in the stream into the bed along with the stream; maintaining the bed at 300-450‹ C. to produce a mixture of hot combustion gases comprising HCl and being substantially free of Cl 2 and chlorohydrocarbon materials; and recycling the mixture of gases to the oxyhydrochlorination step. The catalyst bed is preferably kept at 350-400‹ C. and a pressure of 25-150 p.s.i.g. A contact time of 10-50 seconds may be employed. The process is suitable for the production of vinyl chloride.