Boots – shoes – and leggings
Patent
1977-07-28
1978-06-20
Ruggiero, Joseph F.
Boots, shoes, and leggings
202160, 203 2, B01D 342, G06G 758
Patent
active
040965740
ABSTRACT:
Control of a fractionation column is accomplished by manipulating the flow rate of the external reflux in response to a calculation of the internal reflux flow rate to maintain the actual flow rate of the internal reflux at a substantially constant, desired value. An improved method for calculating the internal reflux flow rate when the heats of vaporization of the external and internal reflux are different utilizes a constant, representative of the heat of vaporization of the external reflux divided by the heat of vaporization of the internal reflux, to obtain an accurate calculation of the internal reflux flow rate. Greater accuracy in the calculation yields improved control of the fractionation column. Alternatively, the constant, representative of the heat of vaporization of the external reflux divided by the heat of vaporization of the internal reflux, may be utilized to calculate the required flow rate of the external reflux necessary to maintain some desired internal reflux flow rate. Again, use of the described constant provides greater accuracy in the calculation and yields improved control of the fractionation column.
REFERENCES:
patent: 3158557 (1964-11-01), Tolin
patent: 3165454 (1965-01-01), Wienecke
patent: 3392088 (1968-07-01), Johnson
patent: 3428528 (1969-02-01), Oglesby, Jr. et al.
patent: 3502852 (1970-03-01), Lewis
patent: 3600282 (1971-08-01), Lupfer et al.
patent: 3911259 (1975-10-01), Huddleston et al.
Lupfer et al-"Computer Control of Distillation Reflux"-ISA Journal, pp. 34-39, Jun. 1959.
Phillips Petroleum Company
Ruggiero Joseph F.
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