US3704603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose bleaching plant
Assignee: Metso Fiber Karlstad AB
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Filing: 1970-10-30
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Granted: 1972-12-05
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Expires: 1990-10-30
Abstract
Abstract The present invention concerns a cellulose bleaching plant. A container forming part of said plant is provided for continuous axial flow of the pulp to be bleached and is provided with means for exchanging the liquid contents of the pulp. Said means comprise hollow screen bodies and movable spray tubes. Liquid supplied through said tubes and distributed into the pulp displaces the previous liquid contents of the pulp, such as a bleaching solution, which enters the screen bodies and is then discharged. The cavities of the screen bodies are divided into height zones having separate outlets, whereby the discharged liquid is fractionated. The spray tubes supply different liquids in corresponding height zones of the container. Thus a double exchange of liquids is made possible, and the washing liquid that has replaced the bleaching liquid may in its turn be replaced by another chemical treatment liquid.
Inventors
- 👤 Johan C F C Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:50
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/40; B01F23/43; B01F23/431; D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
247 words
A cellulose bleaching vessel for cellulose pulp comprising an upright cylindrical container through which said pulp is axially passed, said container being provided with a screening device located within the container and comprising a set of concentric hollow screen bodies of different diameter and whose centers are aligned with the longitudinal axis of said container, said bodies being located at the same level and each having cylindrical screen faces and an inner cavity for horizontally screening off part of the liquid contents of the pulp through said screen faces and into the inner cavity for discharge as said pulp passes said screen bodies, said container also having at least two movable spray tubes adjacent said screen bodies and including means for supply and distribution of liquid into the pulp, the inner cavity of each of said screen bodies being divided up by means of horizontal partitions into a plurality of different height zones with corresponding height zones in each of said screen bodies and separate liquid discharge outlets for each said height zone, said spray tubes being connected to conduits for supply of different liquids and having liquid discharge orifices located at different levels with respect to the height zones of said screen bodies so that each of said different liquids is sprayed into said pulp at a different level and liquid is screened off at one height zone and discharged separately from liquid screened off at a different height zone through said separate liquid discharge outlets.
Claim 2
Dependent Claim
247 words
A cellulose bleaching vessel for cellulose pulp comprising an upright cylindrical container through which said pulp is axially passed, said container being provided with a screening device located within the container and comprising a set of concentric hollow screen bodies of different diameter and whose centers are aligned with the longitudinal axis of said container, said bodies being located at the same level and each having cylindrical screen faces and an inner cavity for horizontally screening off part of the liquid contents of the pulp through said screen faces and into the inner cavity for discharge as said pulp passes said screen bodies, said container also having at least two movable spray tubes adjacent said screen bodies and including means for supply and distribution of liquid into the pulp, the inner cavity of each of said screen bodies being divided up by means of horizontal partitions into a plurality of different height zones with corresponding height zones in each of said screen bodies and separate liquid discharge outlets for each said height zone, said spray tubes being connected to conduits for supply of different liquids and having liquid discharge orifices located at different levels with respect to the height zones of said screen bodies so that each of said different liquids is sprayed into said pulp at a different level and liquid is screened off at one height zone and discharged separately from liquid screened off at a different height zone through said separate liquid discharge outlets.
Claim 3
Dependent Claim
29 words
A vessel as claimed in claim 1, characterized in that the interior of each screen body located in the same height zone is connected to the same discharge outlet.
Claim 4
Dependent Claim
31 words
A vessel as claimed in claim 1, characterized in that the discharge outlets from different height zones of the screen bodies comprise parallel passages within radial arms carrying the screen bodies.
Claim 5
Dependent Claim
38 words
A vessel as claimed in claim 1, wherein spray tubes connected to different liquid supply conduits are positioned so as to spread the liquid discharged therefrom over coaxial cylindrical surfaces having the same radius located at different levels.
Claim 6
Dependent Claim
51 words
A vessel as claimed in claim 1, characterized in that the discharge means of the spray tubes are distributed over height zones of essentially the same location as the height zones of the screen bodies, whereby the direction of the liquid flow through the pulp predominantly is substantially horizontal and radial.
Claim 7
Dependent Claim
65 words
A vessel as claimed in claim 1, wherein there is branched-off from one of the discharge outlets of the screen bodies a conduit which is connected to and serves for supplying screened-off liquid to spray tubes having orifices located at the same level as, or referred to the movement of the pulp upstream of, the zone of the screen bodies connected to said discharge outlet.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |