Isethionic acid

Isethionic acid (CAS 107-36-8) is a sulfonic acid derivative used primarily as a chemical intermediate and pH buffering agent across pharmaceutical, personal care, and industrial manufacturing sectors. Its sodium and potassium salts, sodium isethionate and potassium isethionate, are independently traded and specified in formulation work, making them distinct procurement targets for global manufacturers.

In personal care manufacturing, these compounds serve as key intermediates in synthesizing acyl isethionate surfactants, the basis of mild, skin-compatible cleansing bars and liquid wash systems. Pharmaceutical formulators use it as a buffering agent and solvent carrier in drug salt formation, particularly where improved solubility or controlled pH is required for stability.

Textile and leather processors apply it in dyeing and finishing baths, where its buffering capacity helps maintain consistent process pH and improves dye uptake uniformity across materials. Paper treatment operations use isethionate salts as dispersing agents to improve fiber compatibility and surface chemistry. Isethionic acid is supplied as an aqueous solution, typically around 70% concentration.

Sodium isethionate is available as a white powder or granules, commonly offered in technical and cosmetic-grade specifications. Potassium isethionate is available from specialty suppliers in technical-grade form.