Composite group vector space method for estimating critical properties of pure organic compound

Composite Group Vector Space (CGVS) method for estimating critical properties Tc, Pc, Vc of organic compounds has been proposed and principle of this method has been elucidated. Expressions for estimating Tc, Pc, Vc have been established with numerical values of relative parameters obtained. The average percent deviations of Tc, Pc, Vc estimation are 0.67, 2.09 and 1.39, respectively, which show that present method demonstrates significant improvement in applicability to predict the above properties, compared the conventional group methods.