Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-05-21
1997-07-08
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62906, F25J 304
Patent
active
056449321
ABSTRACT:
The present invention is a process for the cryogenic separation of air to recover at least one of its constituent components, which is carried out in an air separation unit having at least one distillation column; wherein the distillation column has at least two mass transfer sections, wherein, in each mass transfer section, a flow of vapor and a flow of liquid are counter-currently contacted to accomplish mass transfer and the flow of vapor or liquid or vapor and liquid is different in one section as compared to the other section; wherein contact of the flows of vapor and liquid in each mass transfer section is accomplished using a structured packing; wherein the structured packing comprises elements which are corrugated with substantially parallel corrugations, wherein the parallel corrugations have a longitudinal axis at an angle .beta. relative to horizontal and wherein each corrugation when approximated to be a triangular cross-section has a crimp angle .alpha. defined by the two sides of the corrugation; characterized in that the structured packing used in each mass transfer section have different angles .alpha. and/or .beta. selected such that each mass transfer section is operated in the loading region at which the dimensionless grouping S is in the range between substantially 3.0.times.10.sup.-6 and substantially 8.0.times.10 .sup.-6, where S=T.sub.i m/.sigma., wherein T.sub.i is the shear stress at the liquid-vapor interface (kgm.sup.-1 s.sup.-2), m is the film thickness of liquid flowing over the element (m), and .sigma. is the surface tension of the liquid (kgs.sup.-2).
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Dunbobbin et al. "A Unified Model for Countercurrent Vapor/Liquid Packed Columns. 2, Equations for the Mass-Transfer Coefficients, Mass-Transfer Area, the HETP, and the Dynamic Liquid Holdup", Ind. Eng. Chem, Res. 1994, 33, pp. 1222-1230.
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Bennett Douglas Leslie
Dunbobbin Brian Roy
Pillarella Mark Robert
Air Products and Chemicals Inc.
Jones II Willard
Kilner Christopher
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