2776.     RASMUSON, A.  [Production of High-Purity Oxygen and Its Uses in Chemical Industry.]  Tek. Tid., vol. 78, 1948, pp. 155-159; British Abs., 1948, B, I, p. 390.

        Modern German and American processes for the manufacture of O₂ by fractionation of liquid air are described.  The Linde-Fränkl plant, using a Fränkl corrugated Al heat exchanger, provides O₂ of 98% purity at a cost of 0.64 kw.-hr. per m.³; the American plant using a Collins tubular heat exchanger, provides O₂ of 99.5% purity at a cost of 0.5 kw.-hr. per m.³  The main outlet for this cheap O₂ is in the manufacture of synthetic fuel gases.  Water gas is made from lignite, steam, and O₂ in a Winkler generator or from coke breeze in a Thyssen-Galocsy generator.  The American Hydrocol process utilizes O₂ for the partial combustion of natural gas to yield liquid petroleum fuels.  The use of O₂ also is being considered for the underground gasification of coal.