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    • 1. 发明授权
    • Process for producing 4,4'-dihydroxydiphenylsulfone of high purity
    • 生产高纯度的4,4'-二羟基二苯基砜的方法
    • US4162270A
    • 1979-07-24
    • US896611
    • 1978-04-14
    • Eiji OgataKoji OnoShoji Nakagaki
    • Eiji OgataKoji OnoShoji Nakagaki
    • C07C315/00C07C317/22C07C147/10
    • C07C315/00
    • In a process for producing 4,4'-dihydroxydiphenylsulfone by reacting phenol with sulfuric acid in the presence of a solvent, an improvement which comprises using at least a member selected from the group consisting of chlorobenzene, dichlorobenzene, trichlorobenzene, chlorotoluene, diethylbenzene, xylene, decalin, tetralin and tetrachloroethane as the solvent and removing said solvent progressively and finally substantially completely from the mixture while maintaining the reaction mixture at a temperature of about 160.degree. to about 200.degree. C. to effect precipitation of 4,4'-dihydroxydiphenylsulfone and isomerization of 2,4'-dihydroxydiphenylsulfone to 4,4'-dihydroxydiphenylsulfone.
    • 在溶剂存在下,通过苯酚与硫酸反应生产4,4'-二羟基二苯砜的方法,包括使用至少一种选自氯苯,二氯苯,三氯苯,氯甲苯,二乙苯,二甲苯 ,十氢化萘,四氢化萘和四氯乙烷作为溶剂,并逐渐地并最终基本上完全从混合物中除去所述溶剂,同时将反应混合物保持在约160℃至约200℃的温度,以实现4,4'-二羟基二苯砜和 2,4'-二羟基二苯砜异构化为4,4'-二羟基二苯砜。
    • 2. 发明授权
    • Process for preparing 4,4'-dihydroxydiphenyl sulfone having high purity
    • 制备高纯度的4,4'-二羟基二苯砜的方法
    • US4820831A
    • 1989-04-11
    • US10095
    • 1986-12-12
    • Eiji OgataKoji OnoNobuyuki Nate
    • Eiji OgataKoji OnoNobuyuki Nate
    • C07C315/00B01J31/02C07C67/00C07C313/00C07C317/22F15B11/04C07C147/10
    • C07C317/00
    • The process of the present invention is a process for preparing 4,4'-dihydroxydiphenyl sulfone by subjecting phenol, and a sulfonating agent or phenolsulfonic acid to a dehydration reaction in the presence of a solvent, subsequently maintaining the reaction system at a temperature of between 100.degree. to 200.degree. C. and removing the solvent from the reaction system to cause the dehydration reaction to further proceed while allowing 4,4'-dihydroxydiphenyl sulfone to separate out and to subject dissolved 2,4'-dihydroxydiphenyl sulfone formed as a by-product to an isomerization reaction for converting the by-product to 4,4'-dihydroxydiphenyl sulfone, and eventually removing the solvent and the unreacted phenol from the system substantially entirely to complete the isomerization reaction, the process being characterized in that an aromatic sulfonic acid represented by the formula ##STR1## wherein X is a halogen atom, n is 0, 1 or 2, and m is 1 of 2 is caused to be present in the reaction system. 4,4'-Dihydroxydiphenyl sulfone can be produced by the process with a high purity and in a high yield.
    • PCT No.PCT / JP86 / 00194 Sec。 371日期:1986年12月12日 102(e)日期1986年12月12日PCT提交1986年4月17日PCT公布。 公开号WO86 / 06370 日本1986年11月6日。本发明的方法是通过在溶剂存在下使苯酚和磺化剂或苯酚磺酸进行脱水反应来制备4,4'-二羟基二苯基砜的方法, 反应体系在100〜200℃的温度下,从反应体系中除去溶剂,使脱水反应进一步进行,同时使4,4'-二羟基二苯砜分离出来并使溶解的2,4' - 二羟基二苯砜作为副产物形成异构化反应,用于将副产物转化为4,4'-二羟基二苯基砜,并最终从体系中除去溶剂和未反应的苯酚,完全完全异构化反应,该方法 其特征在于,由式“IMAGE”表示的芳族磺酸,其中X为卤素原子,n为0,1或2,m为2的m为芳族磺酸存在于 反应体系。 4,4'-二羟基二苯砜可以通过高纯度和高收率的方法生产。