Battelle, Pacific Northwest Laboratories has developed a solid supported molten salt (SSMS) hot gas cleanup process for integrated coal gasification/molten carbonate fuel cell (MCFC) power plants. In bench scale experiments the process simultaneously removed hydrogen sulfide (H/sub 2/S), carbonyl sulfide (COS) and hydrogen chloride (HCl) from MCFC anode feed gas at 1375 to 1475/sup 0/F and up to 180 psig. Regeneration produced a H/sub 2/S-rich gas from which elemental sulfur could be efficiently recovered. Through 16 absorption/regeneration cycles at each of two absorber sizes, conditions for continuous removal of H/sub 2/S to less than 1 ppM were well established. Further study would be required to assure removal of COS and HCl to that degree in a commercial design and to develop a practical means for chloride regeneration. A dynamic model was developed that uses measured equilibrium data and the two film theory to represent mass transfer resistance. The model can accurately simulate absorption and early regeneration performance under a range of conditions using a single, overall particle phase mass transfer coefficient. A 50% reduction in cost of the SSMS system would make the cost of coal gasification/SSMS/MCFC power plants competitive with published estimates for other developmental technology. Effective sulfur capacity and, therefore, economics, improve with more reducing, lower pressure and higher temperature absorption conditions. Battelle proposes avenues for process and sorbent optimization that would further improve efficiency and could also produce the required cost reduction. Further study is recommended to allow comparison of SSMS with other hot gas cleanup and sulfur recovery systems on an equivalent basis and to determine whether further development of the solid supported molten carbonate concept for the MCFC application is justified. 35 figs.