SEPARATION AND/OR RECOVERY OF PROPYL BROMIDE

摘要

DESCRIBED IS APROCESS FOR SEPARATING AN ORGANIC PHASE COMPRISING MAINLY PROPYL BROMIDE FROM A CRUDE REACTION MIXTURE FORMED BY FREE-RADICAL CATALYZED HYDROBROMINATION OF PROPYLENE WITH HYDROGEN BROMIDE. THE PROCESS COMPRISES (A) FEEDING COLD WATER INTO AN UPPER OR MID- PORTION OF A PACKED COLUMN; (B) CONCURRENTLY FEEDING THE CRUDE REACTION MIXTURE INTO AN UPPER PORTION AND/OR MID-PORTION OF THE COLUMN SO THAT THE WATER CONTACTS THE CRUDE REACTION MIXTURE; TO FORM A MIXTURE OF (I) AN ACIDIC AQUEOUS PHASE COMPRISING AQUEOUS HYDROGEN BROMIDE AND (II) AN ORGANIC PHASE COMPRISING PROPYL BROMIDE; (C) WITHDRAWING THE RESULTANT PHASES FROM SAID COLUMN, AT A RATE COMPARABLE TO THE FEEDS BEING MADE INTO THE COLUMN; AND (D) SEPARATING THE PHASES TO FORM AN UPPER ACIDIC AQUEOUS PHASE COMPRISING AQUEOUS HYDROGEN BROMIDE SUPERPOSED ON A LOWER LIQUID ORGANIC PHASE COMPRISING PROPYL BROMIDE, AND SEPARATING THESE UPPER AND LOWER PHASES FROM EACH OTHER.