The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1989
Filed:
Apr. 09, 1986
Applicant:
Inventors:
Richard B Lund, Jackson, AL (US);
Milo C Pass, Saraland, AL (US);
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
260508 ; 260509 ;
Abstract
A process for the preparation of sulfonated aromatic amines is disclosed based upon starting with the corresponding amine reacted with sulfuric acid in the presence of a sufficient excess of sulfuric acid to act as the reaction solvent. The sulfuric acid excess in the case of sulfanilic acid, the most common of these sulfonated amines and exemplified herein is an aniline:sulfuric acid ratio in the range 1:2.0 to 1:2.5. The reaction, with recycling of the excess acid, provides substantially 100% yield of high quality sulfonated aromatic amine with effectively no effluent but the product.