Abstract: A separation apparatus is for continuous thermal separation of a substance being fed into a treatment chamber. The substance includes a vessel including a vessel wall with an outer inner surface enclosing the treatment chamber having a length, a height and a width, a substance inlet for feeding the substance into the treatment chamber, a first outlet for releasing non-evaporated parts, a second outlet for releasing evaporated parts, and a rotary mechanism including a rotatable axle arranged at least partly within the treatment chamber along the length and a mixing device fixed to, and extending perpendicular from, the rotatable axle. A rotary drive is operatively connected to or near an end of a rotatably axis. A heater is arranged outside the treatment chamber. The heater is configured to transfer thermal energy via the inner surface to the treatment chamber.