PROCESS FOR REMOVAL OF IMPURITIES FROM MOTHER LIQUOR IN THE SYNTHESIS OF CARBOXYLIC ACID USING PRESSURE FILTRATION

摘要

A PROCESS IS DISCLOSED THAT RELATES TO THE RECOVERY OF A METAL CATALYST FROM AN OXIDIZER PURGE STREAM PRODUCED IN THE SYNTHESIS OF CARBOXYLIC ACID, TYPICALLY TEREPHTHALIC. MORE PARTICULARLY, THE PROCESS INVOLVES RECOVERY OF A METAL CATALYST FROM AN OXIDIZER PURGE STREAM THROUGH THE USE OF A PRESSURE FILTER, THE COMBINING OF WATER WITH A MOTHER LIQUOR TO RECOVER THE METAL CATALYST AND THEN SUBJECTING AN AQUEOUS MIXTURE SO FORMED TO A SINGLE STAGE EXTRACTION WITH AN EXTRACTION SOLVENT TO PRODUCE AN EXTRACT STREAM COMPRISING ORGANIC IMPURITIES AND A RAFFINATE STREAM COMPRISING THE METAL CATALYST.