公开(公告)号：US3657330A

公开(公告)日：1972-04-18

申请号：US3657330D

申请日：1970-01-07

Applicant: STAMICARBON

Inventor： GARRITSEN JOHAN W ,  GREGORIE JOHANNES H C M A

IPC: C07C51/43 ,  C07C51/42 ,  C07C51/48

CPC classification number: C07C51/43 ,  C07C63/26

Abstract: A PROCESS IS DESCRIBED FOR THE PURIFICATION OF CRUDE TEREPHATHALIC ACID, CONTAMINATED WITH IMPURITIES SUCH AS PARA-TOLUIC ACID AND PARA-CARBOXY BENZALDEHYDE, WHEREIN THE CRUDE TEREPHTHALIC ACID IS DISSOLVED IN A SOLVENT MIXTURE OF WATER AND ACETONITRILE AS ELEVATED PRESSURES AND TEMPERATURES IN EXCESS OF NORMAL BOILING TEMPERATURE OF THE SOLVENT MIXTURE, AND THE SOLUTION THEREAFTER COOLED TO A LOWER TEMPERATURE TO PERMIT RECRYSTALLIZATION OF PURIFIED TEREPHTHALIC ACID FROM THE MOTHER LIQUOR.