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    • 10. 发明授权
    • Air separation method and apparatus to produce nitrogen
    • 产生氮气的空气分离方法和装置
    • US5507148A
    • 1996-04-16
    • US459946
    • 1995-05-31
    • Robert A. Mostello
    • Robert A. Mostello
    • F25J3/04F25J3/02
    • F25J3/0423F25J3/04284F25J3/044F25J2200/50F25J2205/02F25J2240/48F25J2270/02
    • An air separation method and apparatus for producing nitrogen is provided in which oxygen enriched liquid, produced as a column bottoms of a distillation column, is partially vaporized and phase separated. The vapor phase is expanded to provide refrigeration while the liquid phase, after pressure reduction, is introduced into the head condenser to condense reflux to the column. Alternatively, part of the oxygen enriched liquid can be fully vaporized and then expanded to provide refrigeration. In such case, another part of the oxygen enriched liquid can be used to condense reflux to the column. Part of the air to be separated is liquefied against the oxygen enriched liquid to be vaporized and then introduced into a lower portion of the column to maintain production and purity levels that would have been obtained had all the oxygen enriched liquid stream been used in condensing reflux to the column.
    • 提供了一种用于制备氮气的空气分离方法和装置,其中作为蒸馏塔的塔底产生的富氧液体被部分蒸发并相分离。 将气相膨胀以提供制冷,同时将减压后的液相引入头冷凝器中以冷凝回流至塔。 或者,部分富氧液体可以完全蒸发,然后膨胀以提供制冷。 在这种情况下,可以使用另一部分富氧液体将回流冷凝至塔。 要分离的部分空气与要蒸发的富氧液体液化,然后引入塔的下部,以保持所有富氧液体流都用于冷凝回流时所产生的和纯度水平 到列。