Method for recovering dimethyl naphthalene-2,6-dicarboxylate

Details Method for recovering dimethyl naphthalene-2,6-dicarboxylate Method for recovering dimethyl naphthalene-2,6-dicarboxylate

1994-06-13

1995-07-04

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C 6748

Patent

active

054301742

ABSTRACT:
A method for recovering dimethyl naphthalene-2,6-dicarboxylate (DMN) from a mixture of dimethyl naphthalene-2,6-dicarboxylate (DMN) and dimethyl terephthalate (DMT), which comprises recrystallizing said mixture in a mixed medium of ethylene glycol and methanol, said mixed medium containing 10 to 60% by weight of ethylene glycol, and separating precipitated dimethyl naphthalene-2,6-dicarboxylate (DMN). According to this invention, DMN can be recovered with high yield from a mixture of DMN and DMT which is obtained from depolymerization of a mixed polymer of polyethylene-2,6-naphthalenedicarboxylate and polyethylene terephthalate.

REFERENCES:
patent: 4876378 (1989-10-01), Van Sickle
Chemical Abstracts 55:5483e, RN=103272-53-3, 1961.

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