Mechanistic study of chlorine removal from coal by high-temperature leaching. Final report, January 1, 1989-August 31, 1990

摘要

The objectives of this research were to: (1) continue the experimental investigation of removal of chlorine from coal using high-temperature leaching techniques, (2) understand the mechanisms involved in the leaching of chlorine from coal, and (3) develop a mathematical model which can be used to correlate the data and to describe the performance of the process. Efforts involved developing procedures for estimation of effective pore volumes of coal samples and measurement of surface areas of coal samples by use of carbon dioxide rather than nitrogen. Different mesh sizes of Illinois No. 6 seam and Illinois No. 5 seam coals were evaluated. Based on the pore volume and CO(sub 2) surface areas obtained, average pore diameters were calculated for the samples examined. This information was compared to the chlorine removal of the coal samples that occurred during hot water leaching. A second aspect of this research involved study of chloride evolution rates from coal and model chlorine compounds heated in a tube furnace under continuous nitrogen flow. Kinetic parameters were determined. 3 refs., 6 figs., 3 tabs.