C 1875 (OTTO) Cetyl pyridinium chloride, 99% Cas 6004-24-6 - used in a study to assess removal of emulsified oil from oily waste water and removal of emulsified food and mineral oils from waste water. C 1875 (OTTO) Cetyl pyridinium chloride, 99% Cas 6004-24-6 - used for detergent-based extraction of membrane-associated enzymes such as alkaline phosphatase, and in extraction of chromium and palladium.