Distillation process to separate mixtures containing three or mo

Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture

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62635, 62924, 62927, F25J 300

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active

061160512

ABSTRACT:
A technique is set forth to reduce the heat requirement of conventional distillation processes which separate feed mixtures containing three or more components. The technique provides a great deal of flexibility in adjusting the temperatures of the required utilities including a scenario where the heat requirement is reduced without a need for additional higher temperature (and more costly) heat utility. In this technique, when a liquid bottoms stream (or gaseous overhead stream) containing two or more components is sent from an earlier column to a subsequent column, then a return vapor (or liquid) stream is implemented between the same locations in the two columns.

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patent: 5289688 (1994-03-01), Agrawal
patent: 5617741 (1997-04-01), McNeil et al.
Z. Fidkowski and L. Krollikowski, "Minimun Energy Requirements of Thermally Coupled Distallation Systems" AIChe.Journal, Apr. 1987, vol. 33, No. 4, p. 643.
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Phillip C. Wankat and David P. Kessler, "Two-Feed Distillation: Same-Composition Feeds with Different Enthalpies", Ind. Eng. Chem.Res. 1993, 32, 3061-3067.
Rakesh Agrawal, "Synthesis of Distillation Column Configurations for a Multicomponent Separation" Ind. Eng. Chem. Res. 1996, 35, 1059-1071.
Zbigniew T. Fidkowski and Rakesh Agrawal, "Utilization of Waste Heat Stream in Distillation" Ind. Eng. Chem. Res., 1996, 34, 1287-1293.
L. R. Lynd and H. E. Grethlein, "Distillation with Intermediate Heat Pumps and Optimal Sidestream Return" AIChE Journal, Aug. 1986, vol. 32, No. 8, 1347.

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