PROCESS FOR PRODUCING ETHYLENE

摘要

A PROCESS IS PROVIDED FOR THE CONCENTRATION AND RECOVERY OF ETHYLENE AND HEAVIER COMPONENTS FROM AN OXYGENATE CONVERSION PROCESS. A SEPARATION PROCESS SUCH AS A PRESSURE SWING ADSORPTION (PSA) PROCESS IS USED TO REMOVE HYDROGEN AND METHANE FROM A DEMETHANIZER OVERHEAD STREAM COMPRISING HYDROGEN, METHANE AND C₂ HYDROCARBONS AND SUBSEQUENTLY RETURN THE RECOVERED C₂ HYDROCARBONS TO BE ADMIXED WITH THE EFFLUENT FROM THE OXYGENATE CONVERSION PROCESS. THIS INTEGRATION OF A SEPARATION ZONE (132) WITH A FRACTIONATION SCHEME IN AN ETHYLENE RECOVERY SCHEME USING AN INITIAL DEMETHANIZER ZONE (30) RESULTED IN SIGNIFICANT CAPITAL AND OPERATING COST SAVINGS BY THE ELIMINATION OF CRYOGENIC ETHYLENE-BASED REFRIGERATION FROM THE OVERALL RECOVERY SCHEME.(FIG 2)