Teijin Limited

Toru Matsubayashi

Gentaro Yamashita

Nobuo Taneda

Kiyoshi Yamamoto

Hiromitsu Takamoto

In a method of obtaining purified 2,6-naphthalenedicarboxylic acid dimethyl ester by vacuum distilling crude 2,6-naphthalenedicarboxylic acid dimethyl ester under conditions of application of heat, the improvement which comprises vacuum distilling a crude 2,6-naphthalenedicarboxylic acid dimethyl ester having an acid value (A.sub.f), as expressed in milligrams of KOH required for neutralizing the carboxyl groups contained in one gram of said crude 2,6-naphthalenedicarboxylic acid dimethyl ester, of from 1.0 to 50.

Method of purifying crude 2,6-naphthalenedicarboxylic acid dimethyl ester

A process for preparing dimethyl 2,6-naphthalenedicarboxylate, which comprises continuously esterifying 2,6-naphthalenedicarboxylic acid with methanol at a temperature of about 140.degree. to about 350.degree. C. in the presence or absence of an esterifying catalyst, said 2,6-naphthalenedicarboxylic acid being fed into an esterification reaction zone in the form of solid particles having a specific surface area of about 4,000 cm.sup.2 /g.

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Iwakuni, Japan

Toru Matsubayashi