Distillation: processes – separatory – With measuring – testing or inspecting
Patent
1984-08-09
1986-10-14
Bascomb, Wilbur
Distillation: processes, separatory
With measuring, testing or inspecting
203 2, 202160, 202206, 364501, B01D 342
Patent
active
046170928
ABSTRACT:
A process for controlling a distillation column in which feed liquid supplied thereto is heated by heating steam comprises the steps of: controlling the steam flow rate so that the steam flow rate is increased in response to the difference between the temperature measured at the bottom of a calculated column and the temperature of boiling point of the feed liquid until the former temperature exceeds the latter temperature when the former is not higher than the latter; controlling the steam flow rate so that the temperature around an intermediate tray falls within a first predetermined temperature range when the temperature measured at the bottom of the column exceeds the calculated temperature of the boiling point of the feed liquid; controlling the steam flow rate so that a reflux ratio is adjusted to within a predetermined reflux ratio range when the temperature around the intermediate tray falls in the predetermined temperature range; and controlling the steam flow rate so that the reflux ratio is maintained within the predetermined reflux ratio range and the temperature around the intermediate tray is maintained within the predetermined temperature range and the reflux ratio falls in the predetermined reflux ratio range.
REFERENCES:
patent: 3032479 (1962-05-01), Norman
patent: 3108929 (1963-10-01), Tolin
patent: 3224947 (1965-12-01), Lupfer
patent: 3269921 (1966-08-01), Oglesby et al.
patent: 3342699 (1967-09-01), Rijnsdorp
Bascomb Wilbur
Nippon Zeon Co. Ltd.
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