Abstract: This process removes water and at least some of an impurity from a fluid stream which contains a product fluid. The impurity includes a halogenated hydrocarbon. The process includes removing substantially all of the water from the fluid stream to provide a substantially dehydrated fluid stream and introducing the dehydrated fluid stream to an adsorption zone to adsorb the halogenated hydrocarbon from the dehydrated fluid stream to provide the product fluid. The adsorption zone is regenerated by passing a hot regeneration gas through it to remove the halogenated hydrocarbon. The heat from the hot regeneration gas cracks the halogenated hydrocarbon to provide a gaseous impurity component containing hydrogen and at least one halogen. The gaseous impurity component is removed from the regeneration gas at a location outside the adsorption zone.