Shell Oil Comapny

Mossi & Ghisolfi Overseas S.a.

M&g USA Corporation

Susan Secor Pfrehm

Thomas F Brownscombe

William Larry King

Donn Anthony Dubois

James Laurel Buechele

Narayana Mysore

Garo Vaporciyan

Disclosed is a method for selective carboxylation of naphthoic acid, or other aromatic mono-acids to form primarily 2,3-naphthalene dicarboxylic acid (2,3-NDA) or other aromatic diacids which comprises reacting said aromatic mono-acid in the presence of one or more metal oxide catalysts, alone, or in combination, and in the presence of about 0.2 to 0.8 moles excess of base over aromatic mono-acid, at a temperature of about 380&deg; C. to about 420&deg; C., and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420&deg; C. to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.

Process for carboxylation of naphthoic acid to naphthalene dicarboxylic acid

Process for improving yields in a disproportionation reaction (high yield Henkel)

Process for making an aromatic diacid in one step using a single catalyst system

An oxidation free process for converting a hydroxy substituted aromatic to an aromatic diacid which comprises reacting a hydroxy substituted aromatic with excess basic salt in the presence of carbon dioxide at disproportionation/isomerization reaction conditions.

Process for producing diacids by carboxylation of phenolic compounds

Growing community of inventors

Houston, TX, United States of America

Susan Secor Pfrehm