Improved reaction time for the manufacture of diphenylisophthalate/diphenylterephthalate mixture.

摘要

A process for the improved reaction time for the formation of a diphenylisophthalate/diphenylterephthalate monomer from phenol, isophthalic acid, and terephthalic acid. The improvement in reaction time is achieved by maintaining a vacuum throughout the reaction system during the entire length of the reaction. This results also in a greater recovery of water from the reaction system as well as a higher degree of esterification.