What Is Dithiazine?
MonoEthanolAmine Triazine (MEA Triazine) is commonly used to scavenge hydrogen sulfide (H2S) from natural gas. In two consecutive and irreversible reactions, MEA Triazine (I) reacts with H2S to form Thiadiazine (III) and then Dithiazine (V). The reaction is fast, effective, and can provide a cost-effective means to meet H2S tariff requirements. The problem lies in the final product. Dithiazine is a low vapour pressure compound that can become entrained in the natural gas at the parts per billion level. Even at these low levels, it can cause problems for upstream operations once it precipitates out of the solution due to changes in pressure and temperature. After it precipitates, dithiazine can plug filters, disrupt compressors, and cause valves to malfunction. The presence of dithiazine threatens significant losses in productivity through downtime and repair costs.