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公开(公告)号：EP1210311A1
公开(公告)日：2002-06-05
申请号：EP00957332.0
申请日：2000-08-08
CPC分类号： C08G63/189 , B01J27/232 , C07C51/02 , C07C51/15 , C07C51/265 , C07C51/412 , C07C51/416 , C07C51/42 , C07C51/43 , C07C51/47 , C07C51/487 , C07C63/38 , C07C63/26 , C07C63/16 , C07C63/24 , C07C63/36 , C07C63/15 , C07C63/307
摘要： 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°C to about 420°C, and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420°C to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.
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2.发明公开A PROCESS FOR IMPROVING YIELDS IN A DISPROPORTIONATION REACTION (HIGH YIELD HENKEL) 有权一种用于改善在歧化反应的效率（高产HENKEL）
公开(公告)号：EP1210314A2
公开(公告)日：2002-06-05
申请号：EP00957335.3
申请日：2000-08-08
发明人： BROWNSCOMBE, Thomas, L. , BUECHELE, James, L. , DUBOIS, Donn, A. , KING, William, L. , PFREHM, Susan, A.
CPC分类号： C08G63/189 , B01J27/232 , C07C51/02 , C07C51/15 , C07C51/265 , C07C51/412 , C07C51/416 , C07C51/42 , C07C51/43 , C07C51/47 , C07C51/487 , C07C63/38 , C07C63/26 , C07C63/15 , C07C63/36 , C07C63/16 , C07C63/24 , C07C63/307
摘要： Disclosed is a process for disproportionation of potassium naphthoate to the dipotassium salt of 2,6-NDA which gives reproducible improved yields of up to 40 % which comprises: (a) reacting naphthoic acid in the presence of excess base to produce a disproportionation feed comprising a finely dispersed disordered salt mixture of excess base salts and naphthoic acid salts, wherein the feed is prepared by the steps of: (1) Reacting naphthoic acid in the presence of excess base selected from the group consisting of carbonates and bicarbonates to form a salt; (2) Drying said salt mixture by a method which forms a highly mixed disordered salt mixture characterized by a differential scanning calorimeter (DSC) signature characterized by low melting peaks not previously observed in the salt; and (b) disproportionating said solid salts in the presence of a disproportionation catalyst to form the dipotassium salts of 2,6-NDA.
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