SBIR-STTR Award

Low temperature molten salts based on A1, Fe, and B are known. Recently, unique organic chemistry has been demonstrated in these eutectic mixtures. These low temperature eutectics (~100øC) are attractive media for coal conversion. The eutectics should dissolve large quantities of hydrogen. By controlling the acidity of the mixtures, coal cleavage reactions should be enhanced. Ether cleavage reactions should be vastly accelerated by specific chelation in these molten salts. It has already been demonstrated that oil shale can be converted to liquids at temperatures several hundred degrees centigrade lower than in thermal processes. This project will examine coal conversion to toluene solubles in sodium tetrachloro-aluminate, ferric chloride-sodium chloride, and boron tribromide based melts. Melt temperatures from near eutectic point to 250øC will be examined. The effect of modest hydrogen pressure (50, 200, 500 psig at temperature) also will be examined. Where conversion is high, the effect of dissolved water will be examined. A brief study of model compound reactions will be performed, if warranted. Finally, a comparison of molten salt conversion results with conventional direct liquefaction results will be made.Anticipated Results/Potential Commercial Applications as described by the awardee:If Phase I is successful, the improved conversion of coal to distillates in low temperature molten salts will be demonstrated. It is anticipated that the molten salt medium will promote the conversion of coal at very low temperatures and hydrogen pressures. In Phase II, the continuous conversion of coal on a small bench-scale unit (lb/hr capacity) will be demonstrated. Conversion rates, product quality, and operability problems will be determined. Phase II results should allow an assessment of the commercial potential of this coal conversion approach