PATENT

3692. ----- [STUDIEN-UND VERWERTUNGS-G. M. B. H.]  Purifying Gases.  British Patent 452,417, Aug. 21, 1936.  Chem. Abs., vol. 31, 1937, p. 1186. 

Temperatures of 150°-300° are specified.

See also French Patent 784,337 (abs. 3693).