CAS: 91-29-2; 2-((4-Aminophenyl)Amino)-5-Nitrobenzenesulfonic Acid

相似化合物

606093-58-7 119-70-0 91-30-5

上下游产品

CAS号106-50-3 对苯二胺 | CAS号6149-34-4 4-氨基-4-硝基二苯胺 | CAS号100-01-6 对硝基苯胺

对苯二胺,Alkaline Earth Salt Of/the/ Methylsulfuric Acid置于水,Calcium Carbonate体系中,化学反应生成 4'-氨基-4-硝基二苯胺-2-磺酸
参考文献:Ullmann; Dahmen,Chemische Berichte,1908,Vol. 41,P. 3746
标题:Ullmann; Dahmen,Chemische Berichte,1908,Vol. 41,P. 3746

专利信息

专利号:US-4118384-A
优先权日:1976-02-21
标题 :Process for preparation of azo dyestuffs by coupling in presence of aromatic sulphonic acid-formaldehyde reaction product
发明人：MOLLS HANS-HEINZ; SCHIWY WILLY; HORNLE REINHOLD; NEBELING REINHARD
权利人:BAYER AG
摘要:Dyestuff dispersions and dyestuff solutions free from salt or at least having a low salt content are obtained in that the diazotization is carried out with addition of free dispersing agent acid to which, after the synthesis, either no basic agents are added or basic agents are added only up to a pH value of 3. The disclosed process gives dyestuff compositions of low salt content and results in readily dispersible dyestuffs when water insoluble dyestuffs are prepared and stable solutions when water soluble dyestuffs are prepared. The process is widely applicable and chemical constitution of the dyestuffs is conventional.

专利号:US-4035350-A
优先权日:1975-01-30
标 题:Process for the preparation of water-soluble azo dyestuffs by reacting an aromatic amine and a coupling component with alkali metal nitrite or alkyl nitrite in the absence of acid
发明人：LANDLER JOSEF; WORFEL ERHARD
权利人:HOECHST AG
摘要:A new and very advantageous Process had been found for the preparation of azo dyestuffs by diazotation and coupling in which the synthesis is carried out without the hitherto usual addition of an acid, with the proviso that at least one of the diazo and coupling components contains at least one acid group. Besides the saving of reaction material and subsequently of alkali for neutralization of the reaction medium and isolation of the dyestuff, highly concentrated solutions of the dyestuff and salt-free or practically salt-free dyestuffs can be obtained, and waste-water is no longer charged with big amounts of salts.