Desorption by microwaves is an alternative to standard industrial processes for the regeneration of fixed-bed-adsorbers. There are several advantages to using microwaves as the heat supply, but the mechanisms of microwave desorption, especially if several components are present. still have not been analyzed. In this article experiments of multicomponent desorption of fixed-bed-adsorbers are presented. An overview is given about the different mechanisms appearing during the process.