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

摘要

The present invention relates to a manufacturing method of high-purity 2-chloro-4-aminotoluene-5-sulfonic acid of eco-friendly process, more specifically, the present invention may provide a high-purity 2-chloro-4-aminotoluene-5-sulfonic acid without having a purification process by having an efficient reaction process, and minimize a generation of pollutant by reusing a waste solvent through distillation. The present invention comprises the following steps: a first step of adding 2-chloro-4-aminotoluene, solvent, and sulfuric acid to a reactor; a second step of performing a sulfonating reaction to an additive added in the reactor; a third step of manufacturing a wet cake by filtering and cleaning a compound generated in the second step with the solvent; a fourth step of manufacturing the 2-chloro-4-aminotoluene-5-sulfonic acid by vacuum drying the wet cake manufactured in the third step; a fifth step of distilling the waste solvent generated from the third and fourth step.