Refrigeration – Processes – Circulating external gas
Patent
1991-11-15
1994-03-01
Bennet, Henry A.
Refrigeration
Processes
Circulating external gas
62 23, 62 27, 62 22, 62 31, 62 32, 62 33, F25J 304
Patent
active
052896889
ABSTRACT:
This invention relates to an improvement in a process for the separation of a multi-component stream by distillation. A multi-component feed is introduced to a multicolumn distillation system comprising a main column and a side column wherein at least a light component A is separated from a heavier component C in the main column, the lighter component A being removed as an overhead fraction and the heavier component C being removed as a bottoms fraction. The improvement for enhanced recovery of a component in the side column comprises withdrawing a liquid fraction from the main column at a point intermediate the overhead and bottoms and introducing that liquid fraction to an upper portion of the side column. Lighter components are withdrawn from the side column and returned to an optimal location in the distillation system, typically the main column. Reboiling in the side column is effected by removing a portion of the liquid typically from the bottom of this column and vaporizing this fraction against a vapor fraction obtained from the main column. At least a portion of the vapor fraction from the main column is condensed and liquid is returned to an optimal point in the main column distillation system. The vapor fraction withdrawn from the main column and used to vaporize the bottoms of the side column is withdrawn at a point below the liquid removal point for the liquid feed to the side column.
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Air Products and Chemicals Inc.
Bennet Henry A.
Brewer Russell L.
Kilner Christopher B.
Marsh William F.
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