Developed by Allied Chemical Company, this process is selective toward removing sulfur compounds. Levels of CO2 can be reduced by approximately 85%. This process may be used economically when there are high acid-gas partial pressures and the absence of heavy ends in the gas, but it will not normally meet pipeline gas requirements. This process also removes water to less than 1 Ib/MMscf. DIPA can be added to the solution to remove CO2 down to pipeline specifications. This system then functions much like the Sulfinol® process discussed earlier. The addition of DIPA will increase the stripper heat duty; however, this duty is relatively low.
