Process for producing highly pure 2,6-dimethylnaphthalene

Details Process for producing highly pure 2,6-dimethylnaphthalene Process for producing highly pure 2,6-dimethylnaphthalene

1996-12-30

2000-06-06

Griffin, Walter D.

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By cooling of liquid to obtain solid, e.g., crystallization,...

585816, 585814, 585479, 585812, 585481, 585478, C07C 714, C07C 522

Patent

active

060720980

ABSTRACT:
There are disclosed an industrially advantageous process for efficiently producing highly pure 2,6-dimethylnaphthalene (DMN) in high yield from a mixture of DMN by carrying out in turn, the steps of isomerizing a mixture of DMN in the presence of a catalyst; crystallizing the isomerization reaction product in the presence of a solvent (e.g. an aliphatic or alicyclic saturated hydrocarbon) to precipitate 2,6-DMN crystal; isolating and recovering the 2,6-DMN thus precipitated; and distilling the mother liquor formed after the isolation of the crystal to obtain DMN fraction by removing the components having a higher boiling point than DMN and the components having a lower boiling point than DMN, while at least part of the DMN fraction is returned to the isomerization step and circulated through the process; a process for producing a 2,6-naphthalenedicarboxylic acid by subjecting the 2,6-DMN obtained by the above process to liquid-phase oxidation; and a process for producing 2,6-naphthalenedicarboxylic acid ester by esterifying 2,6-naphthalenedicarboxylic acid thus produced.

REFERENCES:
patent: 3173960 (1965-03-01), Robinson
patent: 3590091 (1971-06-01), Skarada et al.
patent: 3649708 (1972-03-01), Schroeder et al.
patent: 3888938 (1975-06-01), Ogasawara et al.
patent: 3957896 (1976-05-01), Yokoyama et al.
patent: 4900717 (1990-02-01), Holtmann et al.
Chemical Abstracts, vol. 84, No. 9, Mar. 1, 1976, Columbus, Ohio, Abstract No. 59048j, p. 482 of JP 50 108 247 A (TEIJIN) Aug. 26, 1975.

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