This article continues a series of annual bibliographic updates of the published literature (since 1980) on distillation and other equilibrium-staged separation processes (1-8). This paper provides a useful and quick reference source to the 1999 journal literature (from the 50 most important chemical engineering journals) for researchers in this area. The following topics are included: Distillation theory and design methods Distillation control and applications Column design data Absorption reactions, absorber design, and cooling towers Liquid-liquid extraction Supercritical extraction A complete bibliographic listing of the chemical engineering journal literature from 1959 to 1999 (with subsequent 6-month updates) is available on a CD-ROM database (9) and full details can be obtained from the author.