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Comparatively Speaking: Sulfate vs. Sulfonate
Posted: April 7, 2006
Sulfates and sulfonates are both classes of anionic surfactants. Both classes commonly are used in personal care applications. However, there are many salient differences including their structure, function and the raw materials used to make them.
Sulfates are compounds that possess a carbon, oxygen sulfur bond. They include things like sodium lauryl sulfate and sodium laureth sulfate.
The presence of the C-O-S bond makes these materials hydrolyze at low pH values, producing alcohol and inorganic sulfate. Sulfates are stable in base at high pH values and, if ethoxylated to a relatively high level, produce low foaming alkali soluble surfactants. Sulfates are made by the reaction of fatty alcohol or fatty alcohol ethoxylates with reagents like SO3 or chlorosulfonic acid (CSA).