Process for producing 2,6-naphthalenedicarboxylic acid and ester

Details Process for producing 2,6-naphthalenedicarboxylic acid and ester Process for producing 2,6-naphthalenedicarboxylic acid and ester

1996-01-03

1996-12-24

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

562414, 562416, C07C 6700, C07C 51215

Patent

active

055875084

ABSTRACT:
A process for producing 2,6-naphthalenedicarboxylic acid (NDCA) is disclosed. This process comprises oxidizing a 2,6-dialkylnaphthalene with a gas containing molecular oxygen in a solvent containing a lower aliphatic carboxylic acid in the presence of a catalyst comprising heavy metal compounds and a bromine compound, and is characterized in that an ester mixture containing dimethyl 2,6-naphthalenedicarboxylate (NDCM) is added to the oxidation reaction. The low boiling distillate, the high boiling still residue, and the residue of the mother liquor after recrystallization, occurring during purification of the crude NDCM, are also used as additives to the oxidation reaction. According to the present invention, NDCA with large particle size and bulk density can be obtained. Therefore, solid-liquid separation of the crystals, drying of the separated crystals and transportation of the dried crystals are made easier.

REFERENCES:
patent: 3487108 (1969-12-01), Chibnik et al.
patent: 3856855 (1974-12-01), Yamashita et al.
patent: 4764638 (1988-08-01), Feld
patent: 5183933 (1993-02-01), Harper et al.
patent: 5442103 (1995-08-01), Iwane et al.
patent: 5523473 (1996-06-01), Saitou et al.

Affiliated with

Also associated with

Rating

Process for producing 2,6-naphthalenedicarboxylic acid and ester does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing 2,6-naphthalenedicarboxylic acid and ester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing 2,6-naphthalenedicarboxylic acid and ester will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1179714