Recovery of Sodium Sulphate from Process Waste of H-Acid Industry

Abstract

India is the second largest manufacturer of H-Acid in the world after China. H-acid is dye intermediate compound used in manufacturing of reactive dyes (To prepare dyeazo coupling in dye manufacturing). Due to its high pollution potential and high treatment cost, most of the countries not allowed H-Acid manufacturing in their countries. Due to usage of high strength acids and alkalies during manufacturing of H-acid, the combined wastewater stream is contaminated with high sulphate content. Sodium salts (NazSO4) get accumulated in H-acid slurry.