Purification of indigo
    4.
    发明授权
    Purification of indigo 失效
    靛蓝的净化

    公开(公告)号:US5116996A

    公开(公告)日:1992-05-26

    申请号:US731657

    申请日:1991-07-17

    IPC分类号: C07D209/36 C09B7/02

    CPC分类号: C09B7/02

    摘要: A process for purifying indigo comprises stripping the as-synthesized aqueous alkaline indoxylate solution before its oxidation to indigo of impurities in the absence of oxygen by distillation or by passing in steam or an inert gas and then treating the indigo precipitated on oxidation of the stripped indoxylate solution with dilute hydrogen peroxide solution.

    摘要翻译: 纯化靛蓝的方法包括在合成的碱性氢氧化异丁酸钠溶液在蒸发或通过蒸汽或惰性气体氧化之前将其氧化成不含氧的杂质的靛蓝,然后处理在汽提的吲哚氧化物氧化时沉淀的靛蓝 溶液用稀二氧化氢溶液。