[EN] PROCESS FOR PRODUCING 4,4'-DICHLORODIPHENYL SULFONE<br/>[FR] PROCÉDÉ DE PRODUCTION DE 4,4'-DICHLORODIPHÉNYLSULFONE
申请人:BASF SE
公开号:WO2021037675A1
公开(公告)日:2021-03-04
The invention relates to a process for producing 4,4'-dichlorodiphenyl sulfone, comprising: (I) reacting thionyl chloride, chlorobenzene and aluminum chloride forming an intermediate reaction product and hydrogen chloride; (II) mixing aqueous hydrochloric acid and the intermediate reaction product to obtain an organic phase comprising 4,4'-dichlorodiphenyl sulfoxide and an aqueous phase; (III) cooling the organic phase to a temperature below the saturation point of 4,4'- dichlorodiphenyl sulfoxide to obtain a suspension; (IV) solid-liquid-separation of the suspension to obtain crystallized 4,4'-dichlorodiphenyl sulfoxide, and mother liquor; (V) washing the crystallized 4,4'-dichlorodiphenyl sulfoxide with a carboxylic acid to obtain carboxylic acid-wet 4,4'-dichlorodiphenyl sulfoxide; (VI) reacting the washed 4,4'-dichlorodiphenyl sulfoxide and an oxidizing agent in a carboxylic acid as solvent to obtain a reaction mixture comprising 4,4'-dichlorodiphenyl sulfone and carboxylic acid; (VII) separating the reaction mixture comprising 4,4'-dichlorodiphenyl sulfone and carboxylic acid into a residual moisture comprising 4,4'-dichlorodiphenyl sulfone as crude product and a liquid phase comprising carboxylic acid.
该发明涉及一种生产4,4'-二氯二苯基砜的方法,包括:(I)反应亚砜氯、氯苯和氯化铝形成中间反应产物和氯化氢;(II)混合水盐酸和中间反应产物以获得含有4,4'-二氯二苯基亚砜的有机相和水相;(III)将有机相冷却至低于4,4'-二氯二苯基亚砜饱和点的温度以获得悬浮液;(IV)固液分离悬浮液以获得结晶的4,4'-二氯二苯基亚砜和母液;(V)用羧酸洗涤结晶的4,4'-二氯二苯基亚砜以获得羧酸湿润的4,4'-二氯二苯基亚砜;(VI)在羧酸作为溶剂中反应洗涤后的4,4'-二氯二苯基亚砜和氧化剂以获得含有4,4'-二氯二苯基砜和羧酸的反应混合物;(VII)将含有4,4'-二氯二苯基砜和羧酸的反应混合物分离为含有作为原料的4,4'-二氯二苯基砜和含有羧酸的液相。