PROCESS FOR PREPARING INDIGO CARMINE

Process for preparing disodium 5,5'-indigosulfonate, the feedstock being indigo, this process comprising the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5'-indigosulfonic acid, this process being characterized in that: ii) a...

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Bibliographische Detailangaben
Hauptverfasser:	FERAUD, Michel, QUERU, Stephane, LOPEZ, Nicolas, SAYAH, Babak
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES HUMAN NECESSITIES HYGIENE LAKES MEDICAL OR VETERINARY SCIENCE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS POLISHES PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
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Beschreibung
Zusammenfassung:	Process for preparing disodium 5,5'-indigosulfonate, the feedstock being indigo, this process comprising the following steps: i) the indigo is subjected to a sulfonation treatment resulting in a mixture that contains 5,5'-indigosulfonic acid, this process being characterized in that: ii) a reduction treatment is applied to the mixture obtained in step i), and optionally a purification step, so as to obtain a composition comprising leuco-5,5'-indigosulfonic acid, iii) the leuco-5,5'-indigosulfonic acid is isolated from the composition resulting from step ii), iv) the leuco-5,5'-indigosulfonic acid resulting from step iii) is oxidized to give disodium 5,5'-indigosulfonate. (No figure)