ECO-FRIENDLY METHOD FOR PREPARING HIGHLY PURE 2-CHLORO-4-AMINOTOLUENE-5-SULFONIC ACID

摘要

The present invention relates to an eco-friendly method for manufacturing highly pure 2-chloro-4-aminotoluene-5-sulfonic acid that manufactures highly pure 2-chloro-4-aminotoluene-5-sulfonic acid without a refining process by making a reaction process efficient and minimizes the generation of pollutants via a process for distilling and reusing waste solvent. The eco-friendly method for manufacturing highly pure 2-chloro-4-aminotoluene-5-sulfonic acid comprises a first step of adding 2-chloro-4-aminotoluene, a solvent and sulfuric acid to a reactor; a second step of conducting sulfonation on the additive added to the reactor; a third step of manufacturing wet cake by filtering and washing a compound generated in the second step using a solvent; a fourth step of manufacturing 2-chloro-4-aminotoluene-5-sulfonic acid by vacuum-drying the wet cake manufactured in the third step; and a fifth step of distilling waste solvent generated in the third step and the fourth step.