For natural gas with relatively small amounts of sulfur, typically less than 200 ppmv H2S, the Iron Sponge scavenging process was widely used by the industry for many years. Recent safety and environmental concerns associated with the disposal of the spent wood chips has prompted several new H2S scavenger processes to be introduced and used by the industry.
The three major categories of H,S scavengers are:
Caustic/sodium nitrite solutions (e.g., Exxon Corp's Sulfa Check)
Nonregenerable amines/triazines (e.g., Petrolite Corp's Sulfa Scrub)
Iron based (e.g., SulfaTreat Co.'s SulfaTreat).
As these processes be...