METHOD OF PREPARING NAPHTHALENEDICARBOXYLIC ACID DIALKYL ESTER Russian patent published in 1998 - IPC

FIELD: chemical industry. SUBSTANCE: naphalenedicarboxylic acid esters are useful for preparation of various polymeric materials, e.g. polyesters and polyamides. Continuous method of preparing naphthalenedicarboxylic acid dialkyl ester comprises passing liquid phase reaction mixture containing low-molecular weight alcohol, naphthalenedicarboxylic acid and naphthalenedicarboxylic acid dialkyl ester at elevated temperature through successively arranged reaction zones (70, 71, 72, 73). Naphthalenedicarboxylic acid and lower molecular weight alcohol are admitted into reaction zone with reaction mixture flow rising upwards, in at least one reaction zone stirring is carried out and liquid containing naphthalenedicarboxylic acid dialkyl ester is removed from reaction zone with flow dripping down. The claimed method makes it possible to carry out esterification without catalysts at high degree of conversion. EFFECT: more efficient preparation method. 8 cl, 1 dwg, 7 ex, 3 tbl