Patent ID: 7935323

Claim:
A system for removing hydrogen sulfide from natural gas comprising: a first reactor receiving a partially-consumed scavenging reagent and a sour natural gas, said partially-consumed scavenging reagent reacting with said sour natural gas in said first reactor to produce a partially-sweetened natural gas and a consumed scavenging reagent; a separator operatively connected to said first reactor, said separator receiving said consumed scavenging reagent and said partially-sweetened natural gas, said consumed scavenging reagent being separated from said partially-sweetened natural gas via said separator; a second reactor operatively connected to the separator, said second reactor receiving a clean scavenging reagent and said partially-sweetened natural gas, said clean scavenging reagent reacting with said partially-sweetened natural gas in said second reactor to produce a sweetened natural gas; a scavenging reagent delivery system operatively connected to the first reactor and said second reactor, said scavenging reagent delivery system delivering said clean scavenging reagent to said second reactor and delivering said partially-consumed scavenging reagent to said first reactor; and a control system controlling a flow of said partially-consumed scavenging reagent to said first reactor and a flow of said clean scavenging reagent to said second reactor based on a hydrogen sulfide concentration within said partially-sweetened natural gas.