A method of polishing coal synthesis by electrochemical operation is being perfected. An electrochemical potential gradient is used to remove H{sub 2}S from the coal gas stream, leaving only H{sub 2} to enrich the exiting polished gases. Sulfur byproduct is swept away by an inert sweep gas and later condensed. Current experiments are based on improving selective removal from low initial H{sub 2}S contents (10 ppm). High flow rate data is also being investigated along with sealing the cell housings. Latest option for consistent removal and seals is Zircar manufactured membranes.

Experimentation with a rigidized, electrolyte filled tile, left much to be desired. The instability of the tiles at molten conditions ( > 550{degree}C), provided the necessary mechanism for H{sub 2} to penetrate the membrane. Once H{sub 2} cross-over occurs the entire objective of electrochemical separation becomes nullified. The Zircar membranes used last quarter provided excellent protection against H{sub 2}, prompting a reversion back to them. If porosities are strictly adhered to and the water-gas shift is properly handled, the membranes should provide an adequate mechanism for selective H{sub 2}S removal.