Distillation tower and sidestream stripper therefor

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

1990-01-16

1992-12-01

Bascomb, Jr., Wilbur

Distillation: apparatus

Apparatus

Systems

202154, 202198, 202205, 202234, 196100, 196114, 196127, 196139, 203 76, 203 77, 203 87, 203 93, 203DIG19, 203DIG14, 203DIG9, 208355, 208356, 208357, 208364, B01D 316, C10G 706

Patent

active

051677733

ABSTRACT:
A distillation tower (1) has a plurality of liquid sidestream 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.

REFERENCES:
patent: 2009079 (1935-07-01), Burkhard
patent: 2054777 (1936-09-01), Ward
patent: 2057004 (1936-10-01), Burkhard
patent: 2071909 (1937-02-01), Watt
patent: 3310487 (1967-03-01), Johnson et al.
patent: 3365386 (1968-01-01), Van Pool
patent: 3402124 (1968-09-01), Jones
patent: 3567628 (1971-03-01), Van Pool
patent: 4025398 (1977-05-01), Haselden
patent: 4394219 (1983-07-01), Mix et al.
patent: 4415443 (1983-11-01), Murphy
patent: 4662995 (1987-05-01), Lipkin et al.
patent: 4702819 (1987-10-01), Sharma et al.

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