Many natural gases contain hydrogen sulfide (H2S) in concentration ranging from barely detectable quantities to over 30 mole percent. Gases containing H2S or CO2 are classified as sour, and gases free from H2S and CO2 are called sweet. With increasing demands to natural gas, natural gases containing H2S are also being tapped for utilization after purification. Natural gas that is transported to the fuel market must meet legal requirements, which specify a maximum H2S content less than 4 ppm in the gas.
The removal of H2S from natural gas is accompanied by the removal of CO2 and COS if present, since these have similar acid characteristics. Like dehydration processes, desulfurization processes are primarily of two types: adsorption on a solid (dry process), and absorption into a liquid (wet process). Both the adsorption and absorption processes may be of the physical or chemical type. These processes may also be classified into the following categories:

     •   Non-regenerative. The materials used in treating the gas are not recovered in these processes.
     •   Regenerative processes with recovery as H2S. These include the physical absorption processes, the           amine processes, molecular sieves, etc.
     •   Regenerative processes with recovery as elemental sulfur. With growing environmental concerns          regarding sulfur emission, these processes have acquired a prominent role in desulfurization operations.
   
We cover a wide range sweetening units using MEA, DEA, MDEA, DGA, Sulfothane, Proprietary Amine, and Iron Sponge. We provide skid mounted components as well as construct large plants. Typically, they are operating from 150 psig to 1400 psig and are designed to achieve less than 4.0 ppm H2S, and/or <20 ppm to less than 2.0 mol% CO2 outlet gas.

Product line includes:
     •   CO2 Removal
     •   H2S Removal
     •   COS Removal
     •   Mercaptans Removal