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公开(公告)号：KR810001026B1
公开(公告)日：1981-08-31
申请号：KR740003367
申请日：1974-08-20
Applicant: STANDARD OIL CO
Inventor： FISHER J
Abstract: For the recovery of crystalline terephthalic acid product having a miximum p-toluic acid content not exceeding 150 ppm from a liquid aq. soln. substantially satd. with terephthalic acid contg. 500-6000 ppm of p-toluic acid at a temp. in the range of 400-550oF, the improved process comprising continuously charging such aq. soln. to the first of two or more series connected flash solvent evaporation and stirred crystn. zones each operated at a successively lower temp. wherein at least the zones operated at a temp. within and below the range of 360-320oF crystallize decreasing proportions of originally dissolved terephthalic acid.
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