US4409074A
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Process for electrolysis of an aqueous alkali metal chloride solution
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1981-04-22
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Granted: 1983-10-11
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Expires: 2001-04-22
Abstract
Abstract Disclosed is an electrolytic process of an aqueous alkali metal chloride solution using a cation exchange membrane as a separator of an electrolytic cell, which comprises effecting the electrolysis while utilizing impact resilience of springs positioned at anodes and exerting positive pressure on a cathode compartment of the cell. Not only is stable operation at low cell voltage for a prolonged period of time enabled, but also high purity alkali metal hydroxide containing a reduced amount of sodium chloride is produced.
Inventors
- 👤 Tokuzo Iijima
- 👤 Yasushi Samejima
- 👤 Toshiji Kano
- 👤 Yoshio Hatta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:41
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B9/00; C25B9/05; C25B9/17; C25B9/19
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A process for electrolysis of an aqueous alkali metal chloride solution using a cation exchange membrane by which an electrolytic cell is partitioned into an anode compartment and a cathode compartment, which comprises effecting the electrolysis while utilizing impact resilience of springs positioned at anodes and exerting positive pressure on the cathode compartment.
Claim 2
Dependent Claim
53 words
A process for electrolysis of an aqueous alkali metal chloride solution using a cation exchange membrane by which an electrolytic cell is partitioned into an anode compartment and a cathode compartment, which comprises effecting the electrolysis while utilizing impact resilience of springs positioned at anodes and exerting positive pressure on the cathode compartment.
Claim 3
Dependent Claim
39 words
The process of claim 1, wherein pressing force exerted on an anode side of the cation exchange membrane resulting from impact resilience of the springs is in the range of from 0.01 to 10 kg per cm 2 .
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein the positive pressure exerted on the cathode compartment is in the range of from 0.01 to 10 kg per cm 2 .
Claim 5
Dependent Claim
38 words
The process of claim 1, wherein a means for exerting positive pressure on the cathode compartment is selected, singly or in combination, from anodic solution level, cathodic solution level, anodic gas negative pressure and cathodic gas positive pressure.
Claim 6
Dependent Claim
31 words
The process of claim 1, wherein the electrolysis is effected by substantially contacting the cation exchange membrane with the anode and maintaining cathode-cation exchange membrane spacing at 0 to 5 mm.
Claim 7
Dependent Claim
16 words
The process of claim 1, wherein the cathode-cation exchange membrane spacing is 0 to 3 mm.
Claim 8
Dependent Claim
14 words
The process of claim 1, wherein the anode is an expandable dimensionally stable anode.
Claim 9
Dependent Claim
15 words
The process of claim 1, wherein the electrolytic cell is a finger type electrolytic cell.
Claim 10
Dependent Claim
60 words
The process of claim 1, wherein the electrolysis is effected by utilizing the impact resilience of springs for pressing the anode together with the membrane positioned between the anode and cathode against the cathode for maintaining a reduced anode-cathode spacing, wherein the pressing force exerted between the membrane and the cathode is loosened by the positive pressure on the cathode.
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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |