Distillation tower and sidestream stripper therefor

Details Distillation tower and sidestream stripper therefor Distillation tower and sidestream stripper therefor

B - Operations, Transporting

01

D

B01D 3/32 (2006.01) B01D 3/14 (2006.01) C10G 7/00 (2006.01)

Patent

CA 2078745

- 10 - ABSTRACT OF THE DISCLOSURE: A distillation tower (1) has a plurality of liquid side- stream lines (5, 6, 7) and a multi-stage sidestream stripper (13) which includes a respective stripping section (14, 15, 16) for each sidestream line housed in a common, upright, cylindrical shell (28) which allows vapor to pass freely from each stage to the one above. Partial vaporization of each sidestream is achieved by applying a vacuum to the top of the stripper shell (point 21) and/or introducing strip gas at the bottom (point 20). Because the vapor passes serially through the stripping sections from the bottom of the stripper (13) to the top, the need to supply strip gas separately to the stripping sections and/or apply vacuum individually is avoided. The separation between the sidestream products is improved by including, in each stage, a rectification zone (22, 23, 24) positioned above the stripping section.

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