NOVELTY - The device (100) comprises a chamber (102), an electromagnetic radiation generator (104), a waveguide (106) connecting the electromagnetic radiation generator with the interior portion of the chamber (102), a channel (108) located below an end (110) of the waveguide, a system for controlling pressure within the chamber, a system for controlling power of electromagnetic radiation emitted by the generator, and a separator connected to the chamber and adapted for separating condensate of fluid from evaporated contaminants.    USE - The device is useful for distilling or thickening fluids, which are liquid sorbents contaminated in a process of removing contaminants from natural gas (all claimed), where the sorbents include glycols, amines for desulfurization of gases, solutions of lithium chloride and anhydrous or concentrated sulfuric acid, and useful in chemical industry, food industry, building industry or automotive industry.    ADVANTAGE - The device increases the area of the heat exchange between the heater and the liquid and the evaporation area thus efficiently distilling or thickening the fluids, and has improved life-span.    DETAILED DESCRIPTION - The device (100) comprises a chamber (102), an electromagnetic radiation generator (104), a waveguide (106) connecting the electromagnetic radiation generator with the interior portion of the chamber (102), a channel (108) located below an end of the waveguide, a system for controlling pressure within the chamber, a system for controlling power of electromagnetic radiation emitted by the generator, and a separator connected to the chamber and adapted for separating condensate of fluid from evaporated contaminants. The channel is: adapted for transporting the fluid, where one end of the channel is located in an inlet and the other end of the channel is located in an outlet for the fluid; and shaped so as to prolong a dwell time of the fluid in the chamber. The channel has a shape of a double spiral in which an inlet portion of the channel connects with an outlet portion of the channel at a center of the spiral, where the spiral is a Fermat's spiral. The waveguide has a circular cross-section. The channel is made from a material absorbing the electromagnetic radiation emitted by the generator. The channel is open and has an arbitrary cross section such as U shaped or V shaped cross section. The center of the spiral of the channel is located in an axis of the waveguide. The spiral has a triangular contour and a rectangular contour. The end of the waveguide is closed with a plate/baffle made from a material transmitting electromagnetic radiation, for example from quartz glass. The separator has an outlet connected to the outlet of the chamber. An INDEPENDENT CLAIM is included for a method for distilling or thickening fluids.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a device for distilling fluids.    Fluid distillation device (100)    Chamber (102)    Electromagnetic radiation generator (104)    Waveguide (106)    Channel. (108)