This article continues a series of annual bibliographic updates of the published literature (since 1980) on distillation and other equilibrium-staged separation processes (1 - 13). This paper provides a useful and quick reference Source to the 2004 journal literature (from the 50 most important chemical engineering journals) for researchers in this area. The following topics are included: Distillation Design, Control, and Applications Column Design Data Absorption Reactions and Absorber Design, Cooling Towers Liquid-Liquid Extraction Supercritical Extraction.