Strategic Disclosure of Research Results: The Cost of Proving Your Honesty

PCT No. PCT/EP92/00856 Sec. 371 Date Jan. 4, 1993 Sec. 102(e) Date Jan. 4, 1993 PCT Filed Apr. 16, 1992 PCT Pub. No. WO92/19370 PCT Pub. Date Nov. 12, 1992.The invention relates to a thin-film evaporator equipped with a heatable tubular evaporator body in whose product charged interior a driven rotor is disposed which is equipped with essentially radially oriented vanes. The invention is formed from an evaporator body of at least one thick-wall graphite tube with a plurality of essentially axially extending bores disposed in the tube walls, each one of the bores open at the tube ends into an annular channel which is in communication with a connecting pipe stub for a heating medium. Since the treatment of corrosive media, for example acids charged with solids, places high demands on corrosion resistance of the materials employed and additionally high demands for accuracy of the work, it is proposed to form the evaporator body (1) of at least one thick-wall graphite tube (2); to dispose a plurality of essentially axially extending bores (14) in the tube walls; and to have each one of the bores (14) open at the tube ends into an annular channel (15, 16) which is in communication with a connecting pipe stub (6, 9) for a heating medium.