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    • 8. 发明授权
    • Process for isolating 2-naphthylamine-3,6,8-trisulfonic acid in the form
of the monopotassium or monoammonium salt
    • 用于分离单钾盐或单铵盐形式的2-萘胺-3,6,8-三磺酸的方法
    • US4551283A
    • 1985-11-05
    • US638845
    • 1984-08-08
    • Rudolf Blattner
    • Rudolf Blattner
    • C07C67/00C07C301/00C07C303/06C07C303/32C07C309/47C07C143/56
    • C07C309/47
    • There is disclosed a process for isolating 2-naphthylamine-3,6,8-trisulfonic acid in the form of the alkali or ammonium salt from the sulfonation mixture resulting from the sulfonation of the corresponding naphthylaminemonosulfonic or -disulfonic acid in oleum, which process comprises starting from a sulfonation mixture which contains the naphthylaminetrisulfonic acid in the form of the monopotassium or monoammonium salt, charging said mixture into water or dilute sulfuric acid such that the concentration of the sulfuric acid in the dilute solution or suspension of the sulfonation mixture is 30 to 77% by weight, simultaneously allowing the temperature to rise to 90.degree. to 125.degree. C., subsequently slowly cooling said solution or suspension to a temperature below 40.degree. C., during said cooling adding at least 0.1% by weight, based on naphthylaminetrisulfonic acid, of a dispersant, and isolating the precipitated monopotassium or monoammonium salt of 2-naphthylamine-3,6,8-trisulfonic acid.The naphthylaminetrisulfonic acid isolated in this manner in the form of the monopotassium or monoammonium salt from the sulfonation mixture can be used direct for the manufacture of textile dyes.
    • 公开了一种从磺酸化混合物中分离出碱金属或铵盐形式的2-萘胺-3,6,8-三磺酸的方法,该磺化混合物是由发烟硫酸中相应的萘基氨基磺酸或二磺酸磺化产生的,该方法包括 从含有单钾盐或单铵盐形式的萘基氨基三磺酸的磺化混合物开始,将所述混合物装入水或稀硫酸中,使磺化混合物的稀溶液或悬浮液中的硫酸浓度为30〜 77重量%,同时允许温度升至90℃至125℃,随后将所述溶液或悬浮液缓慢冷却至低于40℃的温度,在所述冷却期间加入至少0.1重量%,基于萘基氨基三磺酸 酸,分散剂,并分离沉淀的2-萘胺-3,6,8-三磺酸的单钾盐或单铵盐。 从磺化混合物中以这种方式分离为单钾盐或单铵盐形式的萘基氨基四磺酸可以直接用于纺织染料的制造。