The objectives of this project are (1) to determine the effects of intraparticle secondary reactions and coal type on coal devolatilization behavior under conditions pertinent to coal gasification and (2) to develop a mathematical model of devolatilization applicable to gasification. Our approach will include measurements of the effects of total external pressure and particle size on product yields and evolution kinetics, and systematic study of the devolatilization behavior of six different coals. Our modeling strategy will be to assemble models of various contributing phenomena (primary and secondary chemical reactions, softening and swelling, heat and mass transfer, and coal type) into a unified and tractable mathematical description of coal devolatilization. Emphasis during this period has been on modifying one of our screen heater reactors to expedite devolatilization products collection, while retaining good material balances. Progress has also been made on procurement of a micro computer system. 4 refs., 2 figs., 3 tabs.