Abstract: The apparatus consists of a vertically arranged tube which simultaneously forms the jacket (9) of the effervescent bed chamber (1) of the crystallizer and of the chamber (3) of the drier. The crystallizer and drier are connected to one another via an aeration surface (6) which is provided with pneumatic means (7) whose permeability decreases in the direction of flow of the granules. In a process for the continuous crystallization and drying of plastics granules, crystallization is carried out in an effervescent bed and drying is carried out in a fluidized bed moving relatively slowly, by means of a hot addition of gas under isothermal conditions. The drier according to the invention is a simple, economical solution for the drying of plastics granules.