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Packed column for exchanging heat and/or mass

Imported: 24 Feb '17 | Published: 06 Jan '04

Etienne Werlen

USPTO - Utility Patents

Abstract

This column includes at least one exchange section (

5, 9, 10, 11) defined between an associated upper liquid distributor (

4, 6, 7, 8) and a lower fluid inlet/outlet (

21, 23) or an associated lower liquid distributor (

7, 8), the exchange section including an upper portion (

5A,

9A) and, under it, another portion (

5B,

9B,

10B,

11B) preferably of the conventional type. The upper packing portion of at least one packing section includes a packing module having less transfer units than a packing module of the conventional packing portion of the same section.

Application to double columns for air distillation.

Description

One embodiment of the invention will now be described with reference to the appended drawings, the single figure of which shows schematically in axial section a double air-distillation column according to the invention.

Claims

1. A packed column for exchanging heat and/or mass between descending liquid and a rising gas, comprising:

2. The packed column of claim 1, wherein the structure of said structured packing module of said upper portion also differs from that of said structured packing module of said another portion by at least one of intrinsic density, mean density over a transverse section of the column, and height.

3. The packed column of claim 2, wherein the mean density over a transverse section of the column of said structured packing module of said upper portion differs from that of said structured packing module of said another portion, and wherein said upper portion occupies only a fraction of the transverse section of the column and is located under jets of liquid coming from said associated upper liquid distributor.

4. The packed column of claim 1, wherein said structured packing module of said upper portion comprises cross-corrugated packing and said structured packing module of said another portion comprises ventilated packing.

5. The packed column of claim 1, wherein said upper portion consists of only a single said structured packing module.

6. The packed column of claim 5, wherein said single structured packing module has a height lower than that of said structured packing module of said another portion.

7. The packed column of claim 1, wherein said structured packing modules of said upper and another portions are stacked directly one on top of the other.

8. The packed column of claim 1, wherein said structured packing modules of said upper and another portions are stacked on top of the other with spacers therebetween.

9. The packed column of claim 1, wherein the column is a double air-distillation column.

10. A packed column for exchanging heat and/or mass between a descending liquid and a rising gas, comprising:

11. The packed column of claim 10, wherein said upper packing module comprises plural parallel strips with gaps therebetween and said upper liquid distributor comprises plural ducts with channels therebetween, and wherein said gaps are aligned directly beneath associated ones of said channels.