B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/354
B01D 53/14 (2006.01) C07C 17/38 (2006.01) C07D 301/32 (2006.01)
Patent
CA 1134597
12,611 STERILIZATION GAS SEPARATION PROCESS Abstract of the Disclosure A process for the separation of a second mixture consisting essentially of ethylene oxide and dichlorodi- fluoromethane from a first mixture comprising ethylene oxide, dichlorodifluoromethane, and air comprising passing the first mixture through two zones connected in series, in a closed system, according to the following steps: (a) passing the first mixture, in gaseous form, into an absorption zone and contacting said first mixture therein counter-currently with an organic liquid solvent, which has a boiling point of at least about 120°C and is capable of absorbing ethylene oxide and dichlorodifluoro- methane under process conditions, at a pressure of about 80 psia to about 450 psia and a temperature of about minus 12°C to about 24°C, the solvent being present in a sufficient amount to absorb essentially all of the ethylene oxide and dichlorodifluoromethane whereby liquid bottoms are formed, and the air, in gaseous form, passes overhead; (b) passing the bottoms from step (a? into a desorption zone wherein the pressure is in the range of about 5 psia to about 25 psia, and the temperature is in the range of about minus 12°C to about 24°C at the top of the zone and in the range of about 40°C to about 120°C at the bottom of the zone with a temperature gradient in between, in such a manner that the ethylene oxide and dichlorodifluoromethane are vaporized forming a gaseous overhead and the solvent forms liquid bottoms; and (c) recovering the overhead from step (b). SPECIFICATION
363234
Hopley William G.
Union Carbide Corporation
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