申请人:Toyo Ink Manufacturing Co., Ltd.
公开号:US05610306A1
公开(公告)日:1997-03-11
A process for producing highly pure 6,13-dihydroquinacridone, which is a suitable intermediate for effectively producing a quinacridone pigment, for a short period of time at high yields, the process comprising providing a cylindrical reactor, providing an atmosphere free of oxygen in the cylindrical reactor, heating the cylindrical reactor so that the temperature of at least a surface of an inner wall of a cylinder of the cylindrical reactor is in the range of from 250.degree. to 400.degree. C., introducing a powder of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester or a mixture of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester with a liquid through a feed port provided in an upper portion of the cylindrical reactor, keeping the powder or the mixture in substantial contact with the inner wall of the cylindrical reactor so that an intramolecular alcohol-elimination reaction of the 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester takes place to form 6,13-dihydroquinacridone, and taking out the 6,13-dihydroquinacridone through an outlet provided in a lower portion of the cylindrical reactor.
一种生产高纯度6,13-二氢喹吖啶的方法,该方法适用于在短时间内高收率有效生产喹吖啶颜料的中间体,该方法包括提供一个圆柱反应器,在圆柱反应器中提供不含氧气的气氛,加热圆柱反应器,使圆柱反应器的圆柱体内壁表面的温度在250℃至400℃范围内,通过圆柱反应器上部提供的进料口引入2,5-二(芳基氨基)-3,6-二氢苯二甲酸二烷基酯的粉末或2,5-二(芳基氨基)-3,6-二氢苯二甲酸二烷基酯与液体的混合物,使粉末或混合物与圆柱反应器内壁实质接触,使2,5-二(芳基氨基)-3,6-二氢苯二甲酸二烷基酯的分子内醇消除反应发生,形成6,13-二氢喹吖啶,并通过圆柱反应器下部提供的出料口取出6,13-二氢喹吖啶。