3128.     SCHUFTAN, P. M.  Modern Gaseous Oxygen Production Methods.  Gas Times, vol. 54, 1948, p. 274-281; British Abs., 1948, B, I, p. 299.

        Paper read to the Institute of Chemical Engineers, February 1948.  Methods for the production  of medium-purity O₂ are discussed in detail.  the development of regenerators and reversing exchangers as efficient heat exchangers and purifiers and of highly efficient machines for cold production by isentropic expansion, assisted by the possibility of using more efficient rectification processes, led to an increase of the thermodynamic efficiency of medium-purity O₂ plants to 19%, compared with 13% achieved in the best classical plants.  Prospects of further improvements are discussed.  A further approach to more reversible rectification methods appear to offer most promise.  In this connection the Rescol process, a development of the British Oxygen Co. is described; detailed estimates of power consumption of this and 3 other medium-purity O₂ processes, the Linde-Fränkl turbine type, and the Kellogg plant, are given.  The problem of producing enriched air is discussed; large-scale developments are imminent.

        SCHULTE, F.  See abs. 167.