Refrigeration – Processes – Circulating external gas
Patent
1976-03-22
1978-05-09
Bernstein, Hiram H.
Refrigeration
Processes
Circulating external gas
62 28, 62 29, 62 44, F25J 304
Patent
active
040884643
ABSTRACT:
A method for the fractionation of air is described allowing the separation of oxygen, nitrogen and argon by a single fractionation column from the top of which gaseous nitrogen is drawn and to which liquid nitrogen is recycled, whereas from the bottom of the column liquid oxygen is drawn which is then heated and recycled into the same, a gaseous product enriched in argon being drawn from an intermediate zone of the fractionation column. The apparatus for carrying out the method comprises substantially one single rectification column which is connected on its top to a drawing and cooling circuit for gaseous nitrogen and recycling circuit for liquid nitrogen; on its middle zone to the supplying line for compressed, cooled and expanded air to be fractionated; and on its bottom to a drawing and heating circuit for liquid oxygen to be partially recycled to the same bottom zone.
REFERENCES:
patent: 2627731 (1953-02-01), Benedict
patent: 2982108 (1961-05-01), Grunberg
patent: 3127260 (1964-03-01), Smith
patent: 3269131 (1966-08-01), Becker
patent: 3564571 (1971-02-01), Yearout
patent: 3605423 (1971-09-01), Stoklosinski
Bernstein Hiram H.
S.I.A.D. Societa Italiana Acetilene E Derivati
VanOphem Remy J.
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