Process for making high performance dyes
    6.
    发明授权
    Process for making high performance dyes 失效
    制备高性能染料的方法

    公开(公告)号:US6096889A

    公开(公告)日:2000-08-01

    申请号:US323346

    申请日:1999-06-01

    CPC分类号: C07C303/44

    摘要: An aromatic amino sulfonic acid compound is purified by a process including steps of:(a) dissolving the aromatic amino sulfonic acid compound in aqueous medium having a basic pH;(b) acidifying the aqueous medium with acetic acid to precipitate the aromatic amino sulfonic acid compound; and(c) removing the precipitated aromatic amino sulfonic acid compound from the aqueous medium.Using acetic acid in the process results in removal of more impurities and undesirable sulfate and chloride salts to provide an improved material for synthesizing dyes and pigments.

    摘要翻译: 通过包括以下步骤的方法纯化芳族氨基磺酸化合物:(a)将芳族氨基磺酸化合物溶解于碱性pH的水性介质中; (b)用乙酸酸化含水介质以沉淀芳族氨基磺酸化合物; 和(c)从水介质中除去沉淀的芳族氨基磺酸化合物。 在该过程中使用乙酸导致除去更多的杂质和不期望的硫酸盐和氯化物盐,以提供合成染料和颜料的改进材料。