申请人:Nicca Chemical Co., Ltd.
公开号:US05767318A1
公开(公告)日:1998-06-16
A process for producing a high purity 2,4'-dihydroxydiphenylsulfone (2,4'-isomer) comprising separating 2,4'-isomer from 4,4'-dihydroxydiphenylsulfone (4,4'-isomer) by adding a hydroxide of an alkali metal in an amount which is the total of an amount by mol 1.6 to 2.2 times as great as the amount by mol of 2,4'-isomer and an amount by mol 0.8 to 1.2 times as great as the amount by mol of 4,4'-isomer to a solution of a mixture of 2,4'-isomer and 4,4'-isomer containing 15% by weight or more of 2,4'-isomer in water, to allow 2,4'-isomer to remain dissolved in water in the form of a dialkali metal salt thereof and 4,4'-isomer to be precipitated from the solution in the form of a monoalkali metal salt thereof. A carbonate of an alkali metal may also be used. In order to accelerate the operation, an excess amount of the alkali may be added, which is subsequently neutralized. A high purity 2,4'-isomer having a purity of 95 to 99.5% by weight can be obtained easily with a high yield from a mixture of the isomers containing 15% by weight or more of 2,4'-isomer.
一种制备高纯度2,4'-二羟基二苯基砜(2,4'-异构体)的方法,包括通过向含有15%或更多2,4'-异构体的2,4'-异构体和4,4'-二羟基二苯基砜(4,4'-异构体)混合物的水溶液中加入一种碱金属的氢氧化物,其数量为2,4'-异构体的摩尔量的1.6至2.2倍和4,4'-异构体的摩尔量的0.8至1.2倍之和,以使2,4'-异构体以其二碱金属盐的形式保持在水中溶解,而4,4'-异构体以其单碱金属盐的形式从溶液中沉淀。也可以使用一种碳酸盐的碱金属。为了加快操作,可以添加过量的碱金属,随后进行中和。可以从含有15%或更多2,4'-异构体的混合物中轻松地高产率地获得纯度为95至99.5%的高纯度2,4'-异构体。