Recovery of dialkyl naphthalene-2,6-dicarboxylates from naphthalene-2,6- dicarboxylic acid-containing polyesters

摘要

A process for the formation and recovery of dialkyl naphthalene-2,6- dicarboxylates from poly-(alkylene naphthalene-2,6- dicarboxylate) polyesters. Alcoholysis of poly(ethylene naphthalene-2,6- dicarboxylate) in the presence of a transesterification catalyst on cooling yields solid dialkyl naphthalene-2,6-dicarboxylate which may be collected by filtration and further purified by recrystallization from xylenes. Novel alkyl hydroxyalkyl naphthalene-2,6-dicarboxylate compounds may be isolated from the filtrate and either reconverted to polyester or further alcoholized to dialkyl naphthalene-2,6-dicarboxylate.