Abstract
The liquefaction behaviour of coals can vary over a wide range depending on both their chemical and petrographic characteristics. Sixty-eight coals have been studied under standard liquefaction conditions, in the presence of tetralin but with no added catalyst or molecular hydrogen. Simple correlations between conversion and individual coal parameters proved unsatisfactory. A novel approach utilizing a stepwise multiple regression analysis led to a number of linear equations relating conversion simultaneously to several coal characteristics. Such linear equations provide a basis for accurately predicting liquefaction behaviour and confirm that wise selection of appropriate feedstocks will have an important economic value. It seems permissible to infer that the behaviour of coals in any processing conditions can only be adequately accounted for by consideration of at least three coal properties; attempts to correlate coal properties solely with a rank parameter, such as carbon content, can no longer be considered adequate.
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