Abstract
ABSTRACT Numerous process-configurations are presently being investigated to produce hydrocarbon liquid from coal. The common step in all the variants is thermal decomposition-dissolution of the coal in a liquid hydrocarbon vehicle; this common step is generally referred to as liquefaction. Unfortunately, up to now, no precise relationship has been established between liquefaction behaviour and coal composition or chemical structure. Extensive Study of the process indicates that liquid yield is high when the fluidity of the feed coal is high or d.a.f. hydrogen content is greater than 5%. The world resource of high-fluidity coal is limited, but in many countries easily mineable subbituminous or lignitic coals are abundant. The little investigation that has been done on the chemistry of liquefaction of low rank coals leaves room to search for an inexpensive method of producing a high yield of liquid from these resources. This paper discusses some relevant experimental data which may lead to development of n...
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