The goal of the Flue Gas Cleanup (FGC) program, sponsored by the Pittsburgh Energy Technology Center, U.S. Department of Energy (DOE), is to promote the widespread use of coal by providing the technology necessary for its utilization in an environmentally and economically acceptable manner. Various research and development (R&D) activities are being sponsored for the reduction of SOx, NOx and fine particulate emissions from coal-fired utility boilers. One area of importance in the program is the development of Advanced Separation Technology. Advanced Separation Technology is one of four key activities in the Combined SOx/NOx Control area of the FGC program. The goal established for the Combined SOx/NOx Control is to remove SOx (SO2 and SO3) and NOx (NO and NO 2 ) simultaneously from the flue gas of coal-fired utility boilers at high removal efficiencies, 95 to 98 percent of the S02 and 75 to 90 percent of the NOx. The four key activities pursued under the Combined SOx/NOx Control area of the FGC program are: o Copper Oxide Technology o Scale-up of the Most Promising Technology o Advanced SOx/NOx Processes o Advanced Separation Technology Copper oxide technology is for a regenerative sorbent process for the simultaneous' control of SOx/NOx. Proof-of-concept testing of a fluidized bed copper oxide process, using a utility slip stream, is scheduled to be conducted at the Kincaid Station of Commonwealth Edison, near Springfield, Illinois. Design of a one-megawatt unit has been completed. Construction of this unit will be completed in the Summer of 1991. Scale-up of the most promising technology involves tile proof-of-concept testing of two emerging technologies: the NOXSO process and Cottrell's Integrated Dry Injection System. The NOXSO process is a dry flue gas treatment system that employs a regenerative sorbent composed of sodium carbonate, deposited on the surface of gamma a 1umina. The Cottre 11 system consists of a low NOx burner to reduce NOx emissions, injection of hydrated lime at economizer temperatures for primary S02 capture, and addition of commercial-grade sodium bicarbonate at cool-side conditions for additional SOx and NOx removal. Advanced SOx/NOx processes consist of diversified projects in SOx/NOx Control. These projects investigate fundamental phenomena and perform supporting activities. Advanced Separation Technology is based en physical separation processes. The driving forces that effect these separations. are differences in partial pressure, electrochemical potential, temperature, and molecular affinity between chemical species.