FIELD: chemistry.
SUBSTANCE: invention relates to an improved method of producing dialkyl ether of naphthalene dicarboxylic acid used in production of different polymer materials such as polyesters or polyamides from a liquid-phase reaction mixture containing low-molecular alcohol, naphthalene dicarboxylic acid, and material which contains polyethylene naphthalate, in mass ratio of alcohol to acid between 1:1 and 10:1, at temperature between 260°C and 370°C and pressure between 5 and 250 absolute atmospheres.
EFFECT: method enables production of highly pure NDC.
6 cl, 2 ex
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