METHODS FOR PRODUCING AND PURIFYING PHENOLPHTHALEIN

摘要

A phthalic anhydride, a phenol, a catalyst, and a promoter are reacted to form a reaction mixture comprising phenolphthalein. The reaction mixture is treated with a first solvent system to form a slurry. The first solvent system comprises a first polar organic solvent. In some embodiments the first solvent system additionally comprises a non-polar organic solvent. Use of the solvent system to treat the reaction mixture simplifies subsequent purification.