| 摘要 |
1464241 Dimethyl 2,6-naphthalene bicarboxylate TEIJIN Ltd 12 Feb 1975 [12 Feb 1974] 6010/75 Heading C2C The invention comprises a method for the production of purified 2,6-naphthalenedicarboxylic acid dimethyl ester, which comprises heating while distilling under reduced pressure a crude 2,6-naphthalene dicarboxylic acid dimethyl ester having an acid value (A f ), as expressed in milligrams of KOH required for neutralizing the carboxyl groups contained in one gram of said crude ester, of from 1À0 to 50. |
