The experiences in the first commercial applications of a patented,(US20170274371A1)regenerable iron nanoparticle slurry used for the removal of hydrogen sulfide(H2S)in several Wyoming gas fields was investigated.The removal of H2S was necessary to meet both sales specification of less than 4ppmv H2S and/or sulfur emission requirements.The SulfurCycle~TM process is based on a regenerable H2S treatment system that uses Pro3~R Nano,a patented iron nanoparticle slurry,to capture and convert H2S into non-hazardous elemental sulfur,Pro3~R Nano has a strong affinity to H2S and can be used to sweeten virtually any sour gas stream such as methane,nitrogen and CO2 or treat liquids including oil,condensate,and water.The innovative iron-redox chemistry which drives Pro3~R Nano utilizes stabilizers to specifically maintain highly reactive ferrihydrite nanoparticles,eliminating the need for expensive chelates.The commercialized product is a complete formulation of reagent,buffer and additives to maintain trouble free field operations.Pro3~R Nano is regenerated with oxygen from air and reused multiple times yielding at least one pound of sulfur per gallon of reagent,providing lower chemical costs when compared to traditional scavenger technologies like Triazine or SulfaTreat~R.SulfurCycle~TM field deployments are complete turnkey H2S treatment systems that play the role of several traditional process trains such as amine plants supported by Claus or acid gas injection,yet installed at a fraction of the capital cost.In one challenging scenario,wells on plungers were commingled for treatment which created huge variances in flow rates(0.1-1.5MMcf7d),pressures(10-lOOpsi)and H2S content(100-2500ppm),often changing within minutes.Triazine could not sufficiently treat the sour gas even with overdosing,yet SulfurCycle~TM with Pro3~R Nano reliably treated the H2S to pipeline specification of<4ppmv prior to sales.In another scenario of oil processing which has associated sour gas at 5000ppmv H2S was treated despite a high background of CO2.Based on results from these initial deployments operated with Pro3~R Nano,SulfurCycle~TM systems can efficiently remove 99.99% of H2S,reliably meeting pipeline specifications of<4 ppmv when treating H2S concentrations up to 1% with flow rates ranging from thousands to millions of cubic feet per day at pressures from 15psi to 1000psi while producing up to several thousand pounds of sulfur per day.
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