Patent · US Expired

Preparation of amine salts of 4-nitrotoluene-2-sulfonic acid

US5892105A · kind A · utility

0Cited by

5References

9Claims

0Family size

Assignee

BASF SE

Inventors

Rudolf Bermes · Ludwigshafen, DE
Armin Haag · Hirschberg, DE
Hellmut Kast
Peter Krotzsch · Ketsch, DE

Key dates

Filing date	Dec 9, 1997
Grant date	Apr 6, 1999
Priority date	—
Expiry date	Dec 9, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B23/148
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing amine salts of 4-nitrotoluene-2-sulfonic acid by sulfonation of nitrotoluene with oleum, subsequent dilution of the reaction mixture with water and extraction with lipophilic amines, wherein the acidic aqueous solution of the sulfonation product is partially neutralized with mineral bases. The compounds prepared according to the invention are particularly suitable for preparing dyes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.