B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 3/16 (2006.01) F25J 3/04 (2006.01)
Patent
CA 2096064
211US04655 ABSTRACT This invention relates to an improvement in a process for the separation of a multi-component stream comprising component A, B and C with A being the most volatile and C the least volatile. A multi-component feed is introduced to a multicolumn distillation system comprising a first or main distillation column and a side column wherein at least a light component A is separated from a heavier component C in the main distilla- tion 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 component B in the side column comprises withdrawing a liquid fraction from the main distil'lation column at a point intermediate the overhead and feed and introducing that liquid fraction to an upper portion of the side column. Lighter components are withdrawn as an overhead from the side column and returned to an optimal location in the distillation system, typically the main distillation column. A vapor fraction is also withdrawn from the main distillation column at a point intermediate the bottoms and feed and vapor fraction is introduced to a lower portion of the side column. A liquid fraction is withdrawn as bottoms and returned to the main distillation column. Thermal integration in the side column Is effected by removing a portion of the liquid typically from the stripping section of the side column and vaporizing this fraction against a vapor fraction obtained from the main distillation column. At least a portion of the vaporized liquid from the side column is returned to the multi-column distillation system. At least a portion of the vapor fraction from the main distillation column is condensed and liquid is returned to an optimal point in the multi-column distillation system. Thermal integration may also be achieved by with- drawing a vapor fraction from the rectifying section of the side column and heat exchanging with a liquid fraction from the main distillation column. E:\RLB\211P4838.APL
Agrawal Rakesh
Woodward Donald Winston
Air Products And Chemicals Inc.
Mcfadden Fincham
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