US4239624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for membrane filtration having an improved desalting effect
Assignee: Wafilin BV
•
Filing: 1978-10-27
•
Granted: 1980-12-16
•
Expires: 1998-10-27
Abstract
Abstract An apparatus for membrane filtration comprises an inlet and an outlet, as well as a central permeate discharge tube. The supporting tubes supporting filtration membranes are disposed in two concentric rows. The outer row contacts the outer wall of the apparatus and the inner row contacts the permeate discharge tube. The centers of the supporting tubes of the first row are on a circle having a diameter of twice the diameter of the supporting tubes. The centers of the supporting tubes of the second row are on a circle having a diameter of 4×diameter of a supporting tube× cos 15°.
Inventors
- 👤 Cornelis Van Zon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/062; B01D63/063; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
An apparatus for membrane filtration comprising: a vessel provided with a liquid inlet for the supply of liquid to be treated, a liquid outlet for the discharge of treated liquid, a permeate discharge tube, two rows of round supporting tubes surrounded by a vessel wall and formed into an inner row and an outer row, each of said supporting tubes in the inner row and the outer row supporting internally a non-woven tube upon which a filtration membrane is attached internally, said two rows of supporting tubes contacting each other in a longitudinal direction, wherein the centers of the cross sections of the supporting tubes in the outer row and the centers of the cross sections of the supporting tubes in the inner row are on the circumference of two concentric circles formed by the two rows of supporting tubes.
Claim 2
Independent Claim
140 words
An apparatus for membrane filtration comprising: a vessel provided with a liquid inlet for the supply of liquid to be treated, a liquid outlet for the discharge of treated liquid, a permeate discharge tube, two rows of round supporting tubes surrounded by a vessel wall and formed into an inner row and an outer row, each of said supporting tubes in the inner row and the outer row supporting internally a non-woven tube upon which a filtration membrane is attached internally, said two rows of supporting tubes contacting each other in a longitudinal direction, wherein the centers of the cross sections of the supporting tubes in the outer row and the centers of the cross sections of the supporting tubes in the inner row are on the circumference of two concentric circles formed by the two rows of supporting tubes.
Claim 3
Dependent Claim
36 words
The apparatus of claim 1, wherein the permeate discharge tube is a central tube, the outer wall of said central tube being in contact with the outer walls of the supporting tubes in the inner row.
Claim 4
Dependent Claim
66 words
The apparatus of claim 1, wherein, as seen in cross section, the centers of the supporting tubes in the inner row are on a circle having a diameter of twice the diameter of a supporting tube and the centers of the supporting tubes in the outer row are on a circle having a diameter being determined by the formula 4×the diameter of a supporting tube×cos 15°.
Claim 5
Dependent Claim
47 words
The apparatus of claim 1, wherein the inner diameter of the vessel wall is determined by the formula 4×the diameter of a supporting tube×cos 15°+the diameter of the supporting tube so that the vessel wall contacts the outer walls of the supporting tubes in the outer row.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1, wherein the supporting tubes interact clampingly with each other and with the permeate discharge tube and with the vessel wall.
Claim 7
Dependent Claim
33 words
The apparatus of claim 1, wherein the vessel includes a first portion carrying the liquid inlet and the liquid outlet, said inlet and outlet being separated from each other by a partition wall.
Claim 8
Dependent Claim
21 words
The apparatus of claim 1, wherein the vessel includes a second portion comprising a cover or cap having an open inside.
Claim 9
Dependent Claim
22 words
The apparatus of claim 1, further comprising a plate with openings leading into a recess in the first and the second portions.
Claim 10
Dependent Claim
13 words
The apparatus of claim 1, wherein the supporting tubes are perforated polyvinylchloride tubes.
Claim 11
Dependent Claim
17 words
The apparatus of claim 1, further comprising a sealing sleeve inside each membrane inside each supporting tube.
Claim 12
Dependent Claim
18 words
The apparatus of claim 10, wherein each supporting tube is an encasing of reinforced filaments, preferably glass filaments.
Claim 13
Dependent Claim
29 words
The apparatus of claim 1, wherein half the supporting tubes supporting the membrane filtration tubes penetrate into the liquid inlet, whereas the other half penetrate into the liquid outlet.
Claim 14
Dependent Claim
37 words
The apparatus of claim 1, wherein the number of supporting tubes carrying the membrane filtration tubes penetrating into the liquid inlet exceeds the number of supporting tubes carrying the membrane filtration tubes penetrating into the liquid outlet.
References Cited (Backward Citations)
US3401798A
Cited
US3485374A
Cited
US3716143A
Cited
US3666109A
Cited
US3616929A
Cited
NL7206279A
Cited
US3737043A
Cited
NL7214986A
Cited
US3923664A
Cited
JPS5335554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |