H₂S and pyrophoric FeS are contaminants that are common in refineries and petrochemical units. United Laboratories International, LLC, has developed the solution: Zyme-Ox.

Zyme-Ox doesn't compound waste disposal costs or require the use of multiple chemicals. It was developed for use as an oxidizer to combat and eliminate H2S and pyrophoric FeS.

Zyme-Ox oxidizes H₂S and pyrophoric FeS on contact providing for safe equipment entry. Zyme-Ox chemistry is often included in the Zyme-Flow® Process in towers and vessels where high H₂S and pyrophoric FeS are commonly found. Common applications include packed sections of towers and heavily fouled trays and drums.

Zyme-Ox exhibits excellent penetration and is perfect for applications where heat or steam may not be a viable option. Zyme-Ox works at temperatures from 200°F down to near freezing. When used in conjunction with Zyme-Flow® Processes it reacts completely to destroy sulfides and pyrophorics, while expending itself and increasing detergency without foam or residue.

Zyme-Ox has also been shown to be effective at removing hydrogen cyanide, polythionates and thiosulfates.