Clean synthesis of disperse azo dyes based on peculiar stable 2,6-dibromo-4-nitrophenyl diazonium sulfate
作者:Jinjing Qiu、Bingtao Tang、Benzhi Ju、Shufen Zhang、Xin Jin
DOI:10.1016/j.dyepig.2019.107920
日期:2020.2
The development of clean synthetic technology of disperse azo dyes is essential for the dye industry due to ecological and economical demands. In this study, a clean, safe, and low-energy-consumption method for preparing disperse azo dyes based on 2,6-dibromo-4-nitroaniline is presented with excellent yield and short reaction time. The peculiar stable diazonium sulfate of 2,6-dibromo-4-nitroaniline
由于生态和经济需求,开发分散的偶氮染料的清洁合成技术对于染料行业至关重要。本研究提出了一种清洁,安全,低能耗的制备基于2,6-二溴-4-硝基苯胺的分散偶氮染料的方法,该方法收率高,反应时间短。从有机反应体系中沉淀出特有的稳定的2,6-二溴-4-硝基苯胺硫酸重氮盐,并将固体重氮盐直接用于合成分散的偶氮染料。与传统方法相比,该方法的硫酸用量减少了80%,废无机盐的用量减少了80.9%,反应系统释放的热量减少了88.5%。染料结构通过1 H NMR验证,1313 C NMR,傅立叶变换红外光谱(FT-IR)和高分辨率质谱(HR-MS)。与市售染料相比,制备的染料具有足以用于工业应用的相同的染色性能。