Patent ID: 7247742

Claim:
A process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising directing a liquid phase reaction mixture comprising a low molecular weight alcohol, a naphthalenedicarboxylic acid, a dialkylester of a naphthalenedicarboxylic acid, and a material having polyethylene naphthalate at a temperature range of about 500° F. to about 700° F. and at a pressure in the range of about 5 to about 250 atmospheres absolute through reaction zones arranged in succession while introducing a naphthalenedicarboxylic acid, a material having polyethylene naphthalate and a low molecular weight alcohol to an upstream reaction zone, agitating at least one reaction zone, and removing a product having a dialkylester formed by the reaction of the naphthalenedicarboxylic acid and the material having polyethylene naphthalate with the low molecular weight alcohol from a downstream reaction zone.