Systematized method and control of fractionation heat balance

Details Systematized method and control of fractionation heat balance Systematized method and control of fractionation heat balance

1975-12-29

1977-06-07

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With measuring, testing or inspecting

Of temperature or pressure

203DIG18, 202160, 202206, 23515112, B01D 342

Patent

active

040281949

ABSTRACT:
Heat balance of a fractionation column is controlled and maintained by obtaining three differential temperatures between selected temperature-sensing points along the height of the column. A signal representing one of the delta-T's is employed in regulating the quantity of reflux returned to the rectification zone. The remaining two delta-T's are conjunctively utilized to regulate the enthalpy (heat-input content) of the reboiled liquid bottoms stream being returned to the reboiler section of the column. With respect to the latter, a selected one of the two delta-T signals is multiplied by a multiplier representing the ratio of the number of trays between the temperature sensing points supplying the non-selected delta-T signal to the number of trays between the temperature sensing points supplying the selected delta-T signal. A signal representing the resulting product is correlated with the non-selected signal, and the signal representing the resulting relationship is utilized to regulate the degree to which the returned liquid bottoms material is vaporized.

REFERENCES:
patent: 2580651 (1952-01-01), Boyd
patent: 2684326 (1954-07-01), Boyd
patent: 3464895 (1969-09-01), Boyd
patent: 3619377 (1971-11-01), Palmer
patent: 3773627 (1973-11-01), Weber
patent: 3830698 (1974-08-01), Kleiss
patent: 3855074 (1974-12-01), Mosler et al.

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