Methods for 2,6naphthalene dicarboxylic acid production
Methods for valuable monomer formation were considered, obtained 2,6naphthalene dicarboxylic acid (NDA) using for production of polyethylene naphthalate (PEN) has improved characteristics comparably polyethylene terephthalate (PET). The most designed NDA production processes based on alkyl naphthalenes catalytic oxidation, have well known drawbacks like many stages and low selectivity. The homogenocatalytic oxidate carbonylation of naphthalene methods in palladium salts solutions with reoxidations presence are more attractive. Direct injection of carbonyl group in aromatic ring combined with transformation of naphthalene carboxylic acid derivatives in NDA, is very attrictive and allow to design less stage high selective processes of NDA production, taking the fact about low concentration and availability of homogeneous Pdcatalysts.