Process for separation of ternary gaseous mixtures by rectification
Abstract
Abstract The present invention concerns a process in which a gaseous fraction is withdrawn from an intermediate level of a main rectification and subjected to a rectification in an auxiliary zone, the liquid fraction obtained in this auxiliary zone being returned to the said intermediate level of the main rectification. The improvement according to the invention concerns the condensation of the said withdrawn gaseous fraction which is effected at the bottom and possibly simultaneously at the top of the said auxiliary zone by the vaporization of the liquid fractions originating from the main rectification. The process is applicable to the separation by rectification of a mixture formed of at least three constituents, two of which are in major proportions, the boiling point of the constituent in small proportions being between the boiling points of the two constituents in major proportions and being closer to that of the less volatile of these two constituents. For example, the invention is applicable to a two-stage air-separation plant with an argon side column.
Inventors
- 👤 P Petit
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |