Caustic Regeneration & Spent Caustic

Each of our H₂S solutions uses a different treatment approach:

• LO-CAT uses a catalytic process that continuously converts H₂S into solid elemental sulfur using a circulating, regenerable liquid solution
• SULFURTRAP media is a solid-phase adsorption process, where H₂S reacts with iron oxide media to form iron sulfide. Once the media is spent, it’s replaced.
• THIOLEX Caustic Wash is a chemical (caustic) treatment process that neutralizes H₂S, and can also remove mercaptans, and COS.

Each process achieves H₂S removal through a different mechanism; catalytic conversion, adsorption, or chemical neutralization, and the right choice depends on your sulfur load, gas composition, and operational goals.

LO-CAT: Can be used to treat H₂S in virtually any gas stream.

SULFURTRAP: Can be used for treating H₂S and light mercaptans in gas and liquid streams.

THIOLEX: Can be used for treating H₂S, mercaptans and COS in gases and liquids.

Review our chart below using your gas flow rate and H₂S quantity in parts per million to determine what is better for you. Anything in the border area between two solutions can be discussed as there could be economic reasons that affect your decision.

If your sulfur rate is below 1.5 TPD of sulfur or is intermittent, our iron oxide adsorbent SULFURTRAP^® is often the most cost-effective. It has a lower capital investment, fast startup and is easy to change out. Adsorbent media can be purchased for your own vessels, or we have a skid-mounted systems for lease or sale.

If your process produces 1.5–20 TPD of sulfur, our liquid redox LO-CAT^® technology usually provides the lowest long-term cost.

No problem. Tell us what kind of process stream you’re treating, what you know about the stream and the spec(s) you are trying to meet, and we’ll be happy to assist you!