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    • 7. 发明授权
    • Process for the preparation of dihydroxyanthraquinones
    • 制备二羟基蒽醌的方法
    • US4002654A
    • 1977-01-11
    • US615101
    • 1975-09-19
    • Andreas HuppertzPeter SchultzDieter Maertens
    • Andreas HuppertzPeter SchultzDieter Maertens
    • C07C50/34C07C45/00C07C67/00C09B1/08C07C49/75
    • C09B1/08
    • The invention relates to a process for the preparation of 1,5-dihydroxyanthraquinone and 1,8-dihydroxy-anthraquinone and of their mixtures. Alkali metal salts or alkaline earth metal salts of the corresponding anthraquinonedisulphonic acid are treated, in an aqueous medium under pressure and at elevated temperatures, with lime, buffer substances and, if appropriate, oxidizing agents, a surface-active agent is added to the resulting reaction mixture and the mixture is then acidified in a continuous process with mineral acid at temperatures of 50.degree. C to 150.degree. C and a pressure of 1-3 bars, and the dihydroxyanthraquinone which has precipitated is isolated. Compared to the known procedure, the process according to the invention is distinguished by a substantially improved space-time yield with at least equal purity of the reaction products.
    • 本发明涉及制备1,5-二羟基蒽醌和1,8-二羟基 - 蒽醌及其混合物的方法。 相应的蒽醌二磺酸的碱金属盐或碱土金属盐在含水介质中在压力和升高的温度下用石灰,缓冲物质和适当的氧化剂处理,将所得到的表面活性剂加入到 然后将混合物在无机酸的连续方法中在50℃至150℃的温度和1-3巴的压力下酸化,分离出沉淀的二羟基蒽醌。 与已知的方法相比,根据本发明的方法的区别在于具有至少相同纯度的反应产物的显着改善的时空产率。