DONOR SOLVENT COAL LIQUE FACTION WITH BOTTOMS RECYCLE AT ELEVATED PRESSURE

摘要

A process for liquefying solid carbonaceous materials wherein increased naphtha yields are achieved by effecting the liquefaction at a pressure within the range from about 1750 to about 2800 psig in the presence of recycled bottoms and a hydrogen-donor solvent containing at least 0.8 wt % donatable hydrogen. The liquefaction is accomplished at a temperature within the range from about 700 to 950 DEG F. The coal:bottoms ratio in the feed to liquefaction is within the range of from about 1:1 to about 5:1 and the solvent or diluent to total solids ratio is at least 1.5:1 and preferably within the range of from about 1.6:1 to about 3:1. The yield of naphtha boiling range materials increases as the pressure increases but generally reaches a maximum at a pressure within the range from about 2000 to 2500 psig.