| 摘要 |
<p>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.</p> |
