Sulfonic acid can be mistaken for sulfuric acid, as only one group of hydroxyl is replaced by an organic substituent. But this is actually produced through sulfonation with the use of an agent called sulfur trioxide. Sulfonic acid is a very strong acid and may produce strong corrosive effects. Thus, preventing exposure and accurate handling must be performed in order to prevent corrosion and other forms of damage.
Acid Catalysts
A catalyst is often applied as a coating and is a substance that initiates a chemical reaction. Aromatic sulfonic acid, in particular, is used in applications such as automotive or floor coatings to cure them for a more durable and protective finish against wear and tear or weathering. Sulfonic acids are also valued for being soluble within organic solvents. They are also a catalyst for ion exchange, or “water softening,” which creates soft water that requires less soap for the same amount of cleaning.
Detergent and Surfactants
Detergents and similar products like soap use sulfonic acid to break down the surface tension between water and grease, dirt, and other grime for a more effective clean. It’s a powerful cleanser that can remove stains from clothing and other fabrics, yet it is also one of the cheapest surfactants in the washing industry. This is what sulfonic acid is used for most commonly.
