Patent US3444456A successfully refreshed from Google Patents.
US4184893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed rinse of particulate beds
Assignee: EIDP Inc
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Filing: 1976-07-13
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Granted: 1980-01-22
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Expires: 1996-07-13
Abstract
Abstract A method of rinsing a wetted particulate solid bed in liquid-contacting service by gravity draining or by gas blowing the bed and then rinsing it with successive gas-impelled pulses of rinse liquid.
Inventors
- 👤 David O. Halvorson
- 👤 Walter J. Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids comprising, in sequence: (a) downward blowing said fixed or stabilized bed of solids with a gas to displace a substantial portion of said process liquid from said voids, (b) quickly adding a preselected volume of rinse liquid at a preselected temperature over the entire top of said bed, said preselected volume being limited to a fraction of the total volume of said bed of solids, (c) quickly downward blowing said bed of solids with a gas to impel said rinse liquid through said bed, and (d) repeating steps (b) and (c) until the desired degree of removal of said void-retained process liquid is effected, or until the sum of said rinse liquid volumes (b) is approximately equal to the total volume of said bed of solids.
Claim 2
Dependent Claim
146 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids comprising, in sequence: (a) downward blowing said fixed or stabilized bed of solids with a gas to displace a substantial portion of said process liquid from said voids, (b) quickly adding a preselected volume of rinse liquid at a preselected temperature over the entire top of said bed, said preselected volume being limited to a fraction of the total volume of said bed of solids, (c) quickly downward blowing said bed of solids with a gas to impel said rinse liquid through said bed, and (d) repeating steps (b) and (c) until the desired degree of removal of said void-retained process liquid is effected, or until the sum of said rinse liquid volumes (b) is approximately equal to the total volume of said bed of solids.
Claim 3
Dependent Claim
42 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids according to claim 1 in which either or both said process liquid and said added rinse liquid are removed by downward suction.
References Cited (Backward Citations)
US595182A
Cited
US2855364A
Cited
US3223747A
Cited
FR1352176A
Cited
US3436260A
Cited
US3458893A
Cited
US3533507A
Cited
US3455819A
Cited
US3613888A
Cited
US3698554A
Cited
US3840117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |