Alternative bromination method - Utilization of Wastewater from the Production of Fine Chemicals

Abstract

Bromamine acid (1-amino-4-bromoanthraquinone-2-sulfonic acid, BAK, Fig. 1 - II.) is an important intermediate of many organic colorants based on anthraquinone structure and represents the basic component of various products of dye industry. Bromamine acid can be prepared in a several ways. Conventional method is based on bromination of 1-aminoanthraquinone-2-sulphonic acid with bromine. This work describes alternative method for the bromination reaction of 1-aminoanthraquinone-2-sulphonic acid by using sodium bromide dissolved in aqueous effluents. This article deals with the new sythetic method for BAK preparation based on the application of aqueous NaBr obtained as by-product and subsequent minimization of emissions of AOX (Adsordable Organic Halides), absorbance and chemical oxygen demand (COD) in wastewater.