Chemistry: physical processes – Physical processes – Crystallization
Patent
1977-11-16
1979-01-02
Scovronek, Joseph
Chemistry: physical processes
Physical processes
Crystallization
137 2, 137110, 208146, 208DIG1, 364500, 422109, B01J 802, C10G 3504, G05D 1102, G06F 1546
Patent
active
041325303
ABSTRACT:
Control of temperature increases (delta-T) through a reaction zone, in which both exothermic and endothermic reactions are effected, is achieved by sensing the inlet temperature of the charge stock, a highest temperature from a plurality of intermediate loci within the reaction zone and the outlet temperature of the effluent from the reaction zone. The inlet temperature sensor co-acts with a Temperature Recorder Controller (TRC), having an adjustable set point (control point), to produce a representative signal which is transmitted to flow-regulating means which adjusts the quantity of charge stock bypassing the feed heater. The difference between the inlet and intermediate temperatures, and that between the intermediate and outlet temperatures are determined to produce two delta-T signals which are transmitted to a Double differential Temperature Recorder Controller (DdTRC) which develops a signal representing the difference between the two delta-T signals compared to a preset difference. The signal is transmitted to the inlet Temperature Recorder Controller to adjust the set point thereof, and the quantity of charge stock bypassing the feed heater is further regulated responsive thereto. Enhanced control is afforded by selecting the higher of the outlet and highest intermediate temperatures, developing another representative signal and adjusting, or overriding the signal being transmitted to the charge stock bypass regulating means.
REFERENCES:
patent: 2285716 (1942-06-01), Hulsberg
patent: 2330767 (1943-09-01), Wetty, Jr.
patent: 2606862 (1952-08-01), Keith
patent: 3031267 (1962-04-01), Martin et al.
patent: 3506715 (1970-04-01), Clark
patent: 3751229 (1973-08-01), Bajek et al.
patent: 3979183 (1976-09-01), Scott
Erickson Robert W.
Hoatson Jr. James R.
Page II William H.
Scovronek Joseph
UOP Inc.
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