Used primarily as a reagent in organic synthesis, it facilitates the introduction of ethanesulfonic acid groups into molecules. It is also employed in the preparation of sulfonate esters, which are valuable intermediates in pharmaceutical and agrochemical manufacturing. Additionally, it serves as a precursor in the development of surfactants and detergents due to its sulfonic acid functionality. In biochemical research, it is utilized to modify proteins and peptides, aiding in the study of their structure and function. Its application extends to the field of polymer chemistry, where it is used to create sulfonated polymers with enhanced properties for various industrial uses.