The following summarizes the results and conclusions of the gas chiller operation and stream characterization performed at the KRW PDU: The gas chiller apparatus was designed, constructed, and successfully operated. The first two runs served primarily as commissioning runs. Chiller operating procedures were established and additional stream characterization needs were identified as a result of these runs. An indication of the types of compounds that would be present in the condensate and flash gases produced as a result of chilling cooled gasifer product gas was obtained. Dissolved gases led to significant concentrations of ammonia (estimated at 1280 mg N/L for the subbituminous coal run, 3330 mg N/L for the lignite run) and cyanide (200 Mg/L for the lignite run). There is evidence that dissolved hydrogen sulfide was also present in the condensate, based on the concentrations of this species found in the flash gases evolved as the condensate was depressurized. Residual quantities of organics were also present. Treatment of this stream would be required to reduce the concentrations of these components. Flash gases produced as the chiller condensate is depressurized contain reduced sulfur species, 1.35 to 2.5 vol. % and carbonyl sulfide, 189 to 932 ppmv) and volatile organics (e.g., 618 to 1610 ppmv of C/sub 6/ ), as well as carbon dioxide and other major gas species present in the chiller inlet gas. Possible options for treatment of this stream would include combining it with other streams routed to sulfur recovery or incineration. Health and safety concerns arise due to the high concentration of H/sub 2/S in the flash gases and cyanide in the condensate. 12 refs., 2 figs., 13 tabs.