US3661260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous slurry separation
Assignee: Mitsubishi Chemical Corp
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Filing: 1970-05-06
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Granted: 1972-05-09
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Expires: 1990-05-06
Abstract
Abstract A mixture of an oil slurry phase and an aqueous phase is continuously supplied into a tower constituting a separation chamber and is retained in it for a time to stratify into respective upper and lower layers, from which the slurry and aqueous phase, respectively, are continuously drawn off and a portion of the drawn-off slurry is tapped and continuously discharged as a slurry product, while the remainder is continuously recirculated to the upper-layer slurry in the chamber. The mixture supply, slurry product discharge, and aqueous phase drawoff are so controlled as to establish and maintain a flow-continuity equilibrium in the chamber whereby the retained quantities of the slurry and aqueous phase are maintained constant.
Inventors
- 👤 Michio Koga
- 👤 Kiyobumi Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:15
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/06; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A method for continuously separating slurry as claimed in claim 1, in which said mixture is introduced continuously into said separation chamber at a flowrate effective to maintain constant the level of the free surface of the slurry phase within the chamber.
Claim 2
Dependent Claim
31 words
slurry recirculation means for continuously drawing off slurry from the chamber through said at least one slurrY drawoff outlet and returning the same to the chamber through an upper end thereof;
Claim 3
Dependent Claim
20 words
slurry discharge means connected to said at least one slurry drawoff outlet for continuously discharging slurry as a product, and
Claim 4
Dependent Claim
62 words
A method for continuously separating slurry as claimed in claim 1, including detecting a differential pressure existing between a level of the slurry phase and the mixture being introduced into said chamber, and introducing the mixture continuously at a flowrate in dependence upon said differential pressure to maintain constant the level of the free surface of the slurry phase within the chamber.
Claim 5
Independent Claim
153 words
A method for continuously separating slurry from a mixture of a lighter oil slurry phase and a heavier aqueous phase which mixture is the result of an aqueous treatment of an olefin polymer slurry derived from a slurry polymerization process, comprising the steps of: introducing said mixture continuously into a tower-type separation chamber; retaining the mixture to be retained for a certain time in said chamber to stratify into said oil slurry phase and said aqueous phase; and continuously drawing off slurry from the upper part of said chamber and, at the same time, aqueous phase from the lower part of said chamber at a rate to maintain a state of dynamic equilibrium within the chamber as a portion of the slurry drawn off is continuously discharged as a slurry product, and continuously recirculating the remaining portion of said slurry drawn off into the oil-slurry phase within the upper part of the chamber.
Claim 6
Dependent Claim
56 words
means to control the rates of supply of the mixture, of the recirculation of slurry, of the discharge of the slurry product, and of the drawoff of the aqueous phase interrelatedly to maintain a state of dynamic equilibrium within the chamber, whereby the levels of the slurry free surface and interface are respectively maintained substantially constant.
Claim 7
Dependent Claim
6 words
Apparatus for continuous slurry separation comprising:
Claim 8
Dependent Claim
79 words
Apparatus as claimed in claim 5, including a baffle plate interposed between said supply inlet and said aqueous phase drawoff outlet, a hot water jacket enclosing the outer surface of said chamber over at least the region thereof from the level of said slurry free surface to the level of said interface, and the cross-section area of the chamber in a region containing the aqueous phase being greater than the cross-section area in a region containing the slurry phase.
Claim 9
Dependent Claim
99 words
Apparatus as claimed in claim 5, in which the distance between said slurry free surface and the upper end of the chamber is in the order of one meter; the distance between said interface and said slurry drawoff outlet being in the order of at least 0.3 meter; the distance between the interface and said supply inlet being in the order of at least 0.5 meter; the slurry drawoff outlet being dimensioned to pass a flowrate of slurry drawn off equal to from five to 100 times the volume of the upper-layer slurry phase within the chamber per hour.
Claim 10
Dependent Claim
46 words
Apparatus as claimed in claim 5, in which said slurry discharge means is connected to a part of said slurry recirculation means to divert a portion of the slurry drawn off from the chamber by said recirculation means to discharge said portion as the slurry product.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |