Sterilization gas separation process
US4249917A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Nov 21, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the separation of a second mixture consisting essentially of ethylene oxide and dichlorodifluoromethane 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: PA0 (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.degree. C. and is capable of absorbing ethylene oxide and dichlorodifluoromethane under process conditions, at a pressure of about 80 psia to about 450 psia and a temperature of about minus 12.degree. C. to about 24.degree. 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; PA0 (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.degree. C. to about 24.degree.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.