Thin-film evaporator made of a corrosion resistant material

A heatable thin-film evaporator, comprising:

• an externally driven rotor with essentially radially oriented vanes disposed in a tubular evaporator body;
• the evaporator body, including at least one thick-walled graphite tube having a first end face and a second end face, a plurality of bores extending essentially axially between the first and second end faces, a first clamping ring having a first edge and a second edge, the first edge including a first open groove annular channel, the first end face of the evaporator body being coupled to the first clamping ring so that the plurality of bores open into the first open groove annular channel;
• a second clamping ring having a first edge and a second edge, the first edge including a second open groove annular channel in the first edge, the first edge of the second clamping ring coupled to the second end face of the evaporator body so that the plurality of bores open into the second open groove annular channel;
• a plurality of tension rods, each tension rod having a first end coupled to the first clamping ring and a second end coupled to the second clamping ring by a spring arrangement so that the first and second end faces of the tube are held in a sealing manner between the first and second clamping rings;
• a first connecting pipe, in communication with the first open groove annular channel, for carrying a heating medium;
• and
• a second connecting pipe, in communication with the second open groove annular channel, for carrying the heating medium.