公开(公告)号：US5081252A

公开(公告)日：1992-01-14

申请号：US361180

申请日：1989-06-05

申请人： Shuichi Mitamura ,  Yoshimi Kata ,  Koichi Fujishiro ,  Yasuhisa Tsutsumi

发明人： Shuichi Mitamura ,  Yoshimi Kata ,  Koichi Fujishiro ,  Yasuhisa Tsutsumi

IPC分类号： B01J23/06 ,  B01J23/10 ,  B01J27/08 ,  C07B61/00 ,  C07C51/00 ,  C07C51/41 ,  C07C63/00 ,  C07C63/38 ,  C07C63/46 ,  C07C65/24 ,  C07D209/88

CPC分类号： C07C51/412 ,  C07C51/41 ,  C07C51/416 ,  C07D209/88

摘要： A process for the preparation of aromatic carboxylic acids or their salts comprises heating carboxyl-free aromatic compounds and aromatic carboxylic acid salts whose basic structures differ from those of the aromatic compounds, or heating polycyclic aromatic compounds with three or more rings and monocyclic or bicyclic aromatic carboxylic acid salts, under carbon dioxide pressure in the presence of one or more metal compounds selected from group (a) of compounds of zinc, cadmium, and thallium and one or more compounds selected from group (b) of compounds of cesium, Group II metals, And Group IIIa metals to effect the intermolecular transfer of the carboxyl groups.

公开(公告)号：US5175354A

公开(公告)日：1992-12-29

申请号：US678425

申请日：1991-04-01

申请人： Shuichi Mitamura ,  Yasuhisa Tsutsumi ,  Yoshimi Kata ,  Atsushi Kawada ,  Naoya Okabayashi

发明人： Shuichi Mitamura ,  Yasuhisa Tsutsumi ,  Yoshimi Kata ,  Atsushi Kawada ,  Naoya Okabayashi

IPC分类号： C07C51/41

CPC分类号： C07C51/416

摘要： The process of this invention for preparing 2,6-naphthalene-dicarboxylic acid comprises a reaction step (Step A) wherein 2,6-naphthalene-dicarboxylic acid potassium salts consisting of 2,6-naphthalene-dicarboxylic acid dipotassium salt and/or 2,6-naphthalene-dicarboxylic acid monopotassium salt are allowed to react with benzene-carboxylic acids in the presence of water to yield 2,6-naphthalene-dicarboxylic acid and benzene-carboxylic acid potassium salts and a separation step (Step B) wherein the crystallized 2,6-naphthalene-dicarboxylic acid is separated from the benzene-carboxylic acid potassium salts dissolved in the aqueous solution and provides 2,6-naphthalene-dicarboxylic acid, useful as raw material for polymers, at low cost on a commerical scale with recycle of potassium.

摘要翻译： 本发明制备2,6-萘二羧酸的方法包括反应步骤（步骤A），其中由2,6-萘二甲酸二钾盐和/或2组成的2,6-萘二羧酸钾盐 ，6-萘 - 二羧酸单钾盐在水存在下与苯羧酸反应，得到2,6-萘二甲酸和苯 - 羧酸钾盐和分离步骤（步骤B），其中 将结晶的2,6-萘二甲酸与溶于水溶液中的苯 - 羧酸钾盐分离，以商业规模低成本提供可用作聚合物原料的2,6-萘二羧酸， 回收钾。