C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/279
C10G 7/00 (2006.01) B01D 3/06 (2006.01)
Patent
CA 1085336
MULTISTAGE EVAPORATOR APPARATUS AND METHOD OF DISTILLING PETROLEUM Abstract of the Disclosure A method and apparatus for separating a predetermined fraction from a crude oil includes preheating the crude oil to vaporize a portion, and feeding the two-phase crude to a first stage flash evaporator. In the first stage evaporator, a vapor portion is separated from residual liquid and the residual liquid is used by means of heat exchange to preheat the crude oil. The vapor fraction from the first stage evaporator has an approximate 90% ASTM distillation temperature about 50-60 F° higher than the first stage evaporator temperature. The vapor fraction is condensed to form a condensate, and the condensate is conveyed to a stripping column for mass transfer with ascending vapors from a second stage boiling type evaporator. The second stage evaporator is operated at a vaporization temperature approxi- mately equal to the 5% ASTM vaporization temperature of the predetermined petroleum fraction collected as liquid from the second stage evaporator. vapors removed from the stripping column include a crude oil fraction having an ASTM flash tem- perature lower than the temperature of operation of the second stage, and crude oil volatile impurities.
275619
Gilbert Frederick W.
Rose Charles D.
Riley-Beaird Inc.
Smart & Biggar
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