What is the difference between sulfation and sulfonation in detergent production?

In the production of anionic detergents, the terms sulfation and sulfonation refer to distinct chemical processes based on the raw materials used and the resulting molecular structure.1

• Sulfation is the process used when the starting material is a fatty alcohol. This reaction results in a detergent molecule containing a sulfate group (–OSO₃Na) attached to the compound.1
• Sulfonation is the process used when the starting material is an alkylbenzene. This reaction results in a detergent molecule containing a sulfonate group (–SO₃Na) attached directly to the benzene ring.1

While these processes differ in their chemical mechanisms and the specific groups they attach, both result in products that are similarly hydrophilic, or attracted to water, which is essential for their function as surfactants. In modern industrial practice, gaseous sulfur trioxide is widely employed to facilitate both of these transformations.1