Process for purifying phthalide

摘要

PCT No. PCT/EP97/03045 Sec. 371 Date Dec. 16, 1998 Sec. 102(e) Date Dec. 16, 1998 PCT Filed Jun. 12, 1997 PCT Pub. No. WO98/00417 PCT Pub. Date Jan. 8, 1998The disclosure is a process for purifying phthalide contaminated by carboxylic acids and/or their derivatives, which comprises adding polyethylene glycol and/or polypropylene glycol to the phthalide to be purified and then performing a fractional distillation.