Used as an alkylating agent in organic synthesis, particularly in the production of surfactants and detergents. It serves as a sulfating agent for alcohols and phenols, enabling the formation of sulfate esters which are key intermediates in the manufacture of biodegradable surfactants. Also employed in the synthesis of lubricant additives and plasticizers due to its ability to introduce butyl groups into various organic molecules. Its reactivity makes it useful in controlled reactions where selective sulfation or alkylation is required.