申请人:SDS Biotech K.K.
公开号:US06452046B2
公开(公告)日:2002-09-17
A process for producing 2,3,5,6-tetrachloro-1, 4-benzenedicarboxylic acid, comprising heating 2,3,5,6-tetrachloro-1,4-benzenedicarboxamide together with sulfuric acid exhibiting an acidity function (—Ho) of 10.27 to 14.44 in the presence of water contained in an amount smaller than a stoichiometric value of hydrolysis at 110 to 190° C. This process efficiently produces 2,3,5,6-tetrachloro-1,4-benzenedicarboxylic acid which is a precursor of dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate useful as a herbicide.
一种生产2,3,5,6-四氯-1,4-苯二甲酸的方法,包括在110到190℃的条件下,在水的存在下,将2,3,5,6-四氯-1,4-苯二甲酰胺与具有酸性功能(—Ho)在10.27至14.44之间的硫酸一起加热,水的用量小于水解的化学计量比。该方法高效地生产2,3,5,6-四氯-1,4-苯二甲酸,该物质是一种除草剂,是二甲基2,3,5,6-四氯-1,4-苯二甲酸酯的前体。