Process for making dyes of high purity

Details Process for making dyes of high purity Process for making dyes of high purity

C - Chemistry, Metallurgy

09

B

C09B 67/54 (2006.01) C07C 303/44 (2006.01) C09D 11/00 (2006.01) C07C 309/46 (2006.01)

Patent

CA 2374446

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.

La présente invention concerne un composé d'acide amino-sulfonique aromatique purifié par un procédé consistant à: (a) dissoudre le composé d'acide amino-sulfonique aromatique dans un milieu aqueux à pH basique; (b) acidifier le milieu aqueux avec de l'acide acétique pour précipiter le composé d'acide amino-sulfonique aromatique; et (c) éliminer le composé d'acide amino-sulfonique aromatique précipité du milieu aqueux. L'utilisation de l'acide acétique dans ce procédé entraîne l'élimination d'une quantité plus importante d'impuretés, de sulfate et de sels de chlorure indésirables, ce qui permet d'obtenir une matière améliorée de synthèse de colorants et de pigments.

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