Claims
- 1. A plant for separating a gas mixture by distillation, which comprises:
a first column structure, a second column structure, a third column structure, and a fourth column structure; each column structure having a top and a base; the top of the first column structure and the top of the fourth column structure being at the same level, and the first column structure and the fourth column structure having substantially the same height; the first column structure comprising a first column and a first section of a second column; the second column structure comprising a second section of the second column; the third column structure comprising a first section of a third column; the fourth column structure comprising a second section of a third column; the top of the first column being thermally linked with the base of the first section by means of a condenser or a boiler; means for feeding the gas mixture to the first column of the first column structure; means for sending fluids from the first column to the second column; means for transferring fluid to the top of the first section of the second column from the bottom of the second section of the second column; means for transferring fluid from the top of the first section of the second column to the bottom of the second section of the second column; means for withdrawing fluid from the second column and sending it to the third column structure; means for withdrawing fluid from the third column structure and sending it to the second column; means for transferring fluid to the top of the first section of the third column from the bottom of the second section of the third column; means for transferring fluid from the top of the first section of the third column to the bottom of the second section of the third column; and means for withdrawing fluid from the top of the fourth column structure; and wherein the second and third column structures are located one above the other.
- 2. The plant according to claim 1, wherein the top of the third column structure is at the same level as the tops of the first and fourth column structures.
- 3. The plant according to claim 1, wherein the second section of the third column has a top condenser.
Priority Claims (1)
Number |
Date |
Country |
Kind |
97 04484 |
Apr 1997 |
FR |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a division of allowed application Ser. No. 09/571,736 filed on May 15, 2000, which is a division of abandoned application Ser. No. 09/059,046, filed Apr. 13, 1998.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09571736 |
May 2000 |
US |
Child |
09758209 |
Jan 2001 |
US |