PETROLEUM SCIENCE AND TECHNOLOGY Vol. 22, Nos. 11 & 12, pp. 1513–1516, 2004 Prediction Enthalpy of Hydrocarbon Vapor at Atmospheric Pressure Emad Talib Hashim, * Iamir E. Maloka, and Sabah Yassin Ibrahim Al-Aqssam University, Engineering College of Sabratha, Sabratha, Libya ABSTRACT A generalized enthalpy-temperature correlation for light hydrocar- bon vapor has been developed to represent the data for a wide range of temperatures 460–1080  F. Detailed analysis shows that the proposed correlation fits the experimental measurements of vapor enthalpy with the corresponding calculated values with an overall absolute error of 1.8% for 131 data points. Key Words: Hydrocarbon; Vapor; Enthalpy. *Correspondence: Emad Talib Hashim, Al-Aqssam University, Engineering College of Sabratha, P.O. Box 517, Sabratha, Libya. 1513 DOI: 10.1081/LPET-200027855 1091-6466 (Print); 1532-2459 (Online) Copyright & 2004 by Marcel Dekker, Inc. www.dekker.com