This thesis is a kinetic study of the vapor phase addition of hydrogen chloride to propylene using activated alumina es a catalyst. Preliminary work on this reaction showed first, that isopropyl chloride is the only gaseous product formed at temperatures of 80°C or less when this catalyst is used. Second, the catalyst activity decreases with time possibly due to the formation of non-volatile polymerized product on the surface. The rate of decreasing catalyst activity is dependent on the temperature and on the conversion.