申请人:Sumikin Chemical Co.
公开号:US05354899A1
公开(公告)日:1994-10-11
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.
披露了一种高收集效率的1,4,5,8-萘四羧酸的大规模生产工艺。在碱性金属催化剂的存在下,将1,3-丁二烯加入到乙基-p-二甲苯的乙基自由基中,环化为1,4,5,8-四甲基-1,2,3,4-四氢萘烯,随后脱氢和氧化得到1,4,5,8-萘四羧酸,从而可以获得廉价的1,4,5,8-萘四羧酸作为染料、颜料、树脂等的中间原料的稳定供应。