摘要
Raw gas gathered from well production has to be treated to extract its ethane,to remove carbon dioxide(CO2)from it and to dry it,so that the send-out ethane gas complies with transport constraints and meets sales-gas specifications.Two distinct families of solvents are used generically for such gas treatment:chemical and physical solvents.The South Pars gas field development phases 9 and 10 feeds gas and natural gas liquids into a processing and fractionation plant(one of the largest gas processing plants in Iran),and is associated with concentrations of 5.37%mole CO2 in the raw gas produced.Furthermore,there are potential problems associated with the CO2 treatment,such as the high-energy requirements for amine solvent regeneration,corrosion caused by aqueous amine solvents and waste/losses(solubility,vaporization)of the solvent used to remove CO2 in the ethane treatment unit.A feasibility simulation study was conducted to evaluate the utilization of Sulfinol-M t AMP solvent(Sulfolane plus Methyl di-ethanol amine plus 2-amino-2-methyl-1-propanol(AMP)plus H2O)to replace the aqueous amine solvent(DEA)currently used in the ethane treatment unit of South Pars phases 9 and 10 gas processing plant.The simulation of the Sulfinol-M t AMP process demonstrates less energy consumption(11241.242 kw versus 11290.398 kw for DEA),negligible corrosion and lower losses of solvent(376.493 kg/h versus 409.2421 kg/h)relative to alternative solvents considered,because of its low vapor pressure.
