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公开(公告)号:US4922008A
公开(公告)日:1990-05-01
申请号:US45734
申请日:1987-04-29
申请人: Gottfried Seifert , Sebastian Staubli , Josef H. Wieland , Willy Regenass , Martin Buerli , John G. Lee , Richard B. Lund
发明人: Gottfried Seifert , Sebastian Staubli , Josef H. Wieland , Willy Regenass , Martin Buerli , John G. Lee , Richard B. Lund
IPC分类号: C07C309/40 , C07C20060101 , C07C67/00 , C07C301/00 , C07C303/06 , C07C305/06 , C11D3/42
CPC分类号: C07C309/00
摘要: A process for the preparation of 4-nitrotoluene-2-sulfonic acid by sulfonating 4-nitrotoluene with oleum or liquid SO.sub.3 is described. The sulfonation is carried out continuously with oleum of at least 50% concentration or liquid 100% SO.sub.3 while keeping the conversion of 4-nitro-toluene in the reaction mixture at .gtoreq.90% during the entire reaction course.The process is inherently non-polluting, and provides the product in high yield and low sulfuric acid content in a form usable for 4,4'-dinitrostilbene-2,2'-disulfonic acid production without further purification.
摘要翻译: 描述了通过用发烟硫酸或液体SO 3磺化4-硝基甲苯来制备4-硝基甲苯-2-磺酸的方法。 在整个反应过程中,在保持反应混合物中4-硝基 - 甲苯转化率为≥90%的同时,连续进行磺化至少50%浓度的发烟硫酸或液体100%SO 3。 该方法固有地是无污染的,并且以不用进一步纯化即可生产可用于4,4'-二硝基二苯乙烯-2,2'-二磺酸生产的形式的高产率和低硫酸含量的产品。