PATENT

3777. ----- [UNION CHIMIQUE BELGE].  [Catalytic Synthesis in Gaseous Phase.]  Belgian Patent 359,588, May 31, 1929.  Chem. Abs., vol. 24, 1930, p. 930.

Pressure tube is divided by tubular walls into 2 annular and 1 central compartment, the upper part of the latter being surmounted by an annular electrical resistance.  The central compartment contains the catalyst through which passes a series of heat-exchanger tubes; these are closed at the bottom and each surrounds a central tube.