Fundamentals of Coal Depolymerization: An Experimental and Statistical Correlative Model of the Effects of Temperature and Solvent on Free Radicals in Coal. Quarterly Report, October 1-December 31, 1980

摘要

In this project we are attempting to develop information as to the nature and possible role of free radicals in the depolymerization of coal under hydroliquefaction conditions. It is generally assumed that free radical chemistry plays an important role in the liquefaction of coal. Central in our work has been the use of a specially designed high pressure/high temperature electron spin resonance cavity that allows us to quantitatively monitor free radicals in coal 2 to 4 minutes after the heating cycle is initiated. The free radical concentration has been measured quantitatively and repetitively at these various sets of conditions. The heating time has been restricted to three minutes, gas pressure to 1600 psi and the gas used is hydrogen. The main conclusions from this work include the following: in general, the coal free radicals are quenched in the naphthalene