A PROCESS FOR THE START-UP OF AN EPOXIDATION PROCESS

摘要

The present disclosure provides processes for the start-up of an ethylene epoxidation process comprising: a) contacting a high selectivity epoxidation catalyst with a feed comprising ethylene, oxygen and an organic chloride for a period of time such that vinyl chloride is produced and capable of being detected in a reactor outlet stream or a recycle gas loop; b) increasing the temperature of the high selectivity epoxidation catalyst to at least about 220° C; c) subsequently reducing the level of organic chloride in the feed over a period of from about 12 to about 36 hours so as to increase the temperature of the catalyst to a temperature of from about 250° C to about 265° C.