PURIFICATION OF INDIGO

Title:

PURIFICATION OF INDIGO

Document Type and Number:

Japanese Patent JPH07157684

Kind Code:

A

Abstract:

PURPOSE: To obtain sufficiently purified indigo in a high yield by extraction- treating an aq. leuco indigo alkali metal salt soln. with an inert solvent under oxygen-excluding conditions and conventionally regenerating the indigo by oxidation.

CONSTITUTION: In a process for purifying indigo, an aq. leuco indigo alkali metal salt soln. is extraction-treated with an inert solvent (e.g. xylene) under oxygen-excluding conditions, and after phase separation, the extraction-treated leuco indigo salt soln. is conventionally regenerated by oxidation. Indigo prepd. by a conventionally known process contains a considerable amt. of impurities such as aniline and N-methylaniline; however, sufficiently purified indigo is obtd. in a high yield by the process of the invention.

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Inventors:

UDO BERUKUMAN
MANFUREETO GENGU
RAINHORUTO KOORUHAUPUTO

Application Number:

JP25223794A

Publication Date:

June 20, 1995

Filing Date:

October 18, 1994

Export Citation:

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Assignee:

BASF AG

International Classes:

C07D209/36; C09B7/00; C09B7/02; C09B67/54; (IPC1-7): C09B67/54; C09B7/00

Attorney, Agent or Firm:

Toshio Yano (2 outside)

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