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A new modification of the Redlich-Kwong equation of stote is presented. The modification follows the procedure suggested by Redlich, Ackerman, et al., in which a deviation function (a function of temperature, pressure, and acentric factor) is added to the compressibility factor from the original equation to improve the agreement with data. The purpose of the present modification wos to improve predictions of the Redlich-Kwong equation in the saturated vopor rrgion up to the critical point while retaining a relatively simple form to make analytical relations for derived properties possible. The equation for pressure correction to vapor entholpy, derived from the compressibility factor by stundord thermodynamic procedures, is also presented. Comparisons of predicted vapor compressibility factors and vopor enthalpy pressure corrections with literature doto are given, demonstroting the advantages of the proposed modification when the saturated vapor region is of principal interest. The modification follows closely the work of Bamer et al. (3) in an effort to retain relative simplicity. However, it uses the deviation function approach, developed Vol. 16, No, 6 AlChE Journal Page 991 14 393 ( 6.2) 142 ( 2 . 2 ) 161 ( 2 . 5 ) 165 (2.6) (near saturation) t Data from Nelson and Holcomb ( 1 6 ) as reported by Bamer et al. ( 3 ) . Data from Yarborougb and Edmister ( 32 ) as reported by Bamer et al. ( 3 )

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