Patent US4047906A successfully refreshed from Google Patents.
US4047906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the purification of waste gas containing gaseous pollutants
Assignee: Taiyo Kaken Co Ltd
•
Filing: 1976-02-20
•
Granted: 1977-09-13
•
Expires: 1996-02-20
Abstract
Abstract In a process for the purification treatment of a waste gas containing gaseous pollutants, including the steps of upwardly introducing the waste gas into the bottom of a tower a multiplicity of stepped trays and at the same time introducing an activated carbon into the top of the tower, allowing the waste gas and the activated carbon to come into contact to form a fluidized bed each on the stepped trays, thereby causing the gaseous pollutants in the waste gas to be adsorbed on the activated carbon the waste gas can be continuously purified by recycling the activated carbon spheres and adopting, as the stepped trays, perforated plates of a specific design.
Inventors
- 👤 Heiichiro Murakami
- 👤 Tsuneo Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/06; B01D53/10; B01D53/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
297 words
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of: providing a tower having an absorbing section containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both of said zones being provided with a plurality of apertures, the total area of the apparatus of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height; continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section; continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon spheres forming a fluidized bed in zone I of each tray and descending through zone II to the next lower tray; and continuously removing purified gas from the top of said tower.
Claim 2
Independent Claim
297 words
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of: providing a tower having an absorbing section containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both of said zones being provided with a plurality of apertures, the total area of the apparatus of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height; continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section; continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon spheres forming a fluidized bed in zone I of each tray and descending through zone II to the next lower tray; and continuously removing purified gas from the top of said tower.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein the apertures of each tray constitute 5-25% of the total tray area.
Claim 4
Dependent Claim
40 words
The method of claim 2, wherein said trays are stepped with the zone II of each tray on a level 10-20 mm below the zone I, and wherein said apertures have a diameter in the range of from 3-5 mm.
Claim 5
Dependent Claim
47 words
The method of claim 2, wherein the central and distal sections of each tray are in the same horizontal plane and wherein the diameter of the apertures in the zone II is 1.5 to 2 times that of the diameter of the apertures in the zone I.
Claim 6
Dependent Claim
19 words
The method of claim 1, wherein the height of the weirs is in the range of from 20-60 mm.
Claim 7
Dependent Claim
27 words
The method of claim 1, wherein said gas is introduced into said tower at a superficial tower velocity in the range of from 0.5 to 2.0 m/sec.
Claim 8
Dependent Claim
47 words
The method of claim 1, wherein said activated carbon spheres have a particle diameter distribution range of from 0.2 to 2.0 mm, an average particle diameter in the range of from 0.5 to 1.2 mm and a bulk density of from 0.5 to 0.7 g/cm 2 .
Claim 9
Dependent Claim
35 words
The method of claim 1, wherein said activated carbon spheres are produced by fusing pitch, molding the fused pitch into spheres and subjecting the resultant pitch spheres to the treatment of infusibilization, carbonization, and activation.
Claim 10
Dependent Claim
22 words
The method of claim 1, wherein said activated carbon spheres exiting the lowermost tray are regenerated and recycled to the uppermost tray.
Claim 11
Independent Claim
157 words
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of: providing a tower having an adsorbing section containing a plurality of vertically spaced trays, each of said trays being divided by at least one weir into first and second zones, each zone having a plurality of apertures, each first zone having 80-95% of the total surface area of the tray and a total aperture area 4-20 times the total aperture area in said second zone, continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section; continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon forming a fluidized bed in said first zone of each tray and descending through said second zone to the next lower tray; and continuously removing purified gas from the top of said tower.
Claim 12
Independent Claim
157 words
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of: providing a tower having an adsorbing section containing a plurality of vertically spaced trays, each of said trays being divided by at least one weir into first and second zones, each zone having a plurality of apertures, each first zone having 80-95% of the total surface area of the tray and a total aperture area 4-20 times the total aperture area in said second zone, continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section; continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon forming a fluidized bed in said first zone of each tray and descending through said second zone to the next lower tray; and continuously removing purified gas from the top of said tower.
Claim 13
Dependent Claim
205 words
A chemical process column containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both said first tray sections being provided with a plurality of apertures, the total area of the apertures of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of said second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height.
Claim 14
Dependent Claim
205 words
A chemical process column containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both said first tray sections being provided with a plurality of apertures, the total area of the apertures of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of said second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height.
Claim 15
Dependent Claim
18 words
The column of claim 11, wherein the apertures of each tray constitute 5-25% of the total tray area.
Claim 16
Dependent Claim
42 words
The column of claim 12, wherein said trays are stepped with the zone II of each tray on a level 10-20 mm below that of the zone I, and wherein said apertures have a diameter in the range of from 3-5 mm.
Claim 17
Dependent Claim
47 words
The column of claim 11, wherein the central and distal zones of each tray are in the same horizontal plane and wherein the diameter of the apertures in the zone II is 1.5 to 2 times that of the diameter of the apertures in the zone I.
Claim 18
Dependent Claim
50 words
The process column of claim 11 wherein said trays are rectangular in shape, each tray having two weirs provided on its upper surface, said weirs on said first type of tray being disposed adjacent opposite walls of said column to define a central zone I and two distal zones II.
Claim 19
Dependent Claim
33 words
The column of claim 15 wherein said trays are stepped with the distal zones II of said first type of tray being on a lower level than that of the central zone I.
Claim 20
Dependent Claim
16 words
The process column of claim 11 wherein said trays and said weirs are circular in shape.
Claim 21
Dependent Claim
25 words
The process column of claim 17 wherein said trays are stepped with the central and distal zones of a given tray being on different levels.
Claim 22
Dependent Claim
34 words
The chemical process column of claim 11, wherein the apertures of each zone II have diameters of 1 to 2 times the diameters of the apertures in the zone I of the same tray.
References Cited (Backward Citations)
DE566945C
Cited
US2371619A
Cited
US2444990A
Cited
US2367694A
Cited
US2443190A
Cited
US2664967A
Cited
US2716587A
Cited
US3786134A
Cited
US3917806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |