97/04548 Liquefaction pathway of subbituminous and high-volatile bituminous coal: Keogh, R. A. and Davis, B. H. Proc. Annu. Int. Pittsburgh Coal Conf., 1996, 13, (1), 460–465

Abstract

The thermal and catalytic liquefaction pathways of a high-volatile bituminous and subbituminous coal have been defined by lumping the standard solubility classes of the products and plotting these parameters on a ternary diagram. The to types of coals have distinctly different reaction pathways. In the initial stage of dissolution of the bituminous coal, the major reaction with increasing conversion is the production of asphaltenes plus preasphaltenes (A+P). During this stage, the oil plus gas (O+G) yields remain fairly constant. The second stage of this pathway begins when the coal conversion and A+P yields reach a maximum. The major reactions taking place in the second stage is the conversion of A+P to O+G. In the initial stage of the subbituminous coal pathway, both A+P and O+G yields increase with increasing coal conversion. The second stage of the subbituminous pathway begins when the A+P yields reach a maximum. In this stage, coal conversion increases moderately; however, the major reaction is the conversion of A+P to O+G.