POLYPHENYLENE-OXIDE SYNTHESIS AND RECOVERY METHOD FOR THE RESULTED SOLVENTS

摘要

The process comprises fractionation of the solvents at atmospheric pressure on a continuous column. The azeotropic benzene-isopropanol mixt. collected as the lateral fraction, and the distillate contg. morpholine, isopropanol and benzene from distillation, are recirculated in the oxide synthesis phase. The organic phase of the prod. separated at the top of the column is recirculated to the column feed.