The invention relates to a device for treating fluid mixtures, which contain gases, such as in particular hydrogen (H2), air, nitrogen (N2), or natural gases, and liquids, such as in particular ionic liquids, hydraulic fluid, or process liquids, comprising at least a first separation stage (29) for separating the fluid mixture into a liquid fraction and a gas fraction, which is contaminated with a remaining liquid fraction, from which gas fraction said remaining liquid fraction is removed in at least one further separation stage (67).