Production process of 1,4,5,8-naphthalene tetracarboxylic acid

Details Production process of 1,4,5,8-naphthalene tetracarboxylic acid Production process of 1,4,5,8-naphthalene tetracarboxylic acid

1993-06-04

1994-10-11

Dees, Jose' G.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6348

Patent

active

053548990

ABSTRACT:
There is disclosed a mass production process of 1,4,5,8-naphthalene tetracarboxylic acid with high collection efficiency. In the presence of an alkaline metallic catalyst, 1,3-butadiene was added to the ethyl radicals of ethyl-p-xylene, and cyclized to 1,4,5,8-tetramethyl-1,2,3,4-tetrahydronaphthalene which was further dehydrogenated and oxidized to obtain 1,4,5,8-naphthalene tetracarboxylic acid, so that a constant supply of inexpensive 1,4,5,8-naphthalene tetracarboxylic acid can be achieved as an intermediate raw material for dye, pigment, resins, or the like.

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