Fiber-grade terephthalic acid by catalytic hydrogen treatment of dissolved impure terephthalic acid

摘要: FIBER-GRADE TEREPHTHALIC ACID CAN BE OBTAINED BY CATALYTIC HYDROGEN TREATMENT OF SOLUTIONS IMPURE ACID. THE TREATED SOLUTION IS SEPARATED FROM CATALYST AND RECOVERED CRYSTALLIZATION SEPARATION IMPURITIES RETAINED IN AQUEOUS MOTHER LIQUOR.