US4285786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of monitoring temperature in a multi-cell electrolyzer
Assignee: Dow Chemical Co
•
Filing: 1980-05-09
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Granted: 1981-08-25
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Expires: 2000-05-09
Abstract
Abstract An apparatus and method of monitoring temperature in a multicell electrolyzer used to produce a gaseous product from a liquid phase electrolyte by placing a single temperature sensing means in the common product collection means is disclosed.
Inventors
- 👤 Eric H. Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:54
CPC Classifications
C; C25; C25B; C25B15/00; C25B15/02; C25B15/023; C25B15/025; C25B15/027
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
175 words
In a process for making halogen gas and alkali metal hydroxide by electrolysis of an aqueous alkali metal halide brine in a bank of two or more electrolytic cells, each cell containing an anode and a cathode and being separated into an anode compartment and a cathode compartment, wherein (a) the halide brine is introduced into an anode compartment; (b) halogen gas produced at an anode is withdrawn from the anode compartments by a common halogen gas collection means; (c) depleted halide brine is removed from the anode compartments through common depleted brine collection means; (d) water or dilute alkali metal hydroxide is fed to a cathode compartment; (e) alkali metal hydroxide is withdrawn through a common alkali metal hydroxide collection means from the cathode compartments; and (f) hydrogen gas produced at a cathode is withdrawn through a common hydrogen gas collection means, the improvement which comprises monitoring temperature in the bank by monitoring a output signal of a single temperature sensing means placed in the common gas collection means for hydrogen or halogen gas.
Claim 2
Dependent Claim
175 words
In a process for making halogen gas and alkali metal hydroxide by electrolysis of an aqueous alkali metal halide brine in a bank of two or more electrolytic cells, each cell containing an anode and a cathode and being separated into an anode compartment and a cathode compartment, wherein (a) the halide brine is introduced into an anode compartment; (b) halogen gas produced at an anode is withdrawn from the anode compartments by a common halogen gas collection means; (c) depleted halide brine is removed from the anode compartments through common depleted brine collection means; (d) water or dilute alkali metal hydroxide is fed to a cathode compartment; (e) alkali metal hydroxide is withdrawn through a common alkali metal hydroxide collection means from the cathode compartments; and (f) hydrogen gas produced at a cathode is withdrawn through a common hydrogen gas collection means, the improvement which comprises monitoring temperature in the bank by monitoring a output signal of a single temperature sensing means placed in the common gas collection means for hydrogen or halogen gas.
Claim 3
Dependent Claim
50 words
A process as described in claim 1 wherein the improvement further comprises feeding water or dilute alkali metal hydroxide solution to a cathode compartment of a preceding cell in the bank and withdrawing alkali metal hydroxide solution from the cathode compartment of one or more succeeding cells in the bank.
Claim 4
Dependent Claim
29 words
A process as described in claim 1 wherein the alkali metal halide is sodium chloride, the halogen gas is chlorine and the alkali metal hydroxide is an sodium hydroxide.
Claim 5
Dependent Claim
23 words
A process as described in claim 1 wherein a first single temperature sensing means is placed in the common hydrogen gas collection means.
Claim 6
Dependent Claim
36 words
A process as described in claim 4 which further comprises placing a second single temperature sensing means in the common alkali metal hydroxide collection means and monitoring the difference in the outputs of the two signals.
Claim 7
Dependent Claim
36 words
A process as described in claim 4 which further comprises placing a second single temperature sensing means in the outlet means for the depleted brine and monitoring the difference in the outputs of the two signals.
Claim 8
Dependent Claim
23 words
A process as described in claim 1 wherein a first single temperature sensing means is placed in the common halogen gas collection means.
Claim 9
Dependent Claim
36 words
A process as described in claim 7 which further comprises placing a second single temperature sensing means in the outlet means for the depleted brine and monitoring the difference in the outputs of the two signals.
Claim 10
Dependent Claim
36 words
A process as described in claim 7 which further comprises placing a second single temperature sensor means in the common alkali metal hydroxide collection means and monitoring the difference in the outputs of the two signals.
Claim 11
Dependent Claim
12 words
A process as described in claim 1 wherein the electrodes are bipolar.
Claim 12
Dependent Claim
18 words
A process as described in claim 1 wherein a diaphragm is interposed between the anode and cathode compartments.
Claim 13
Dependent Claim
20 words
A process as described in claim 1 wherein a cation permselective membrane is positioned between the anode and cathode compartments.
Claim 14
Dependent Claim
110 words
In an apparatus for producing a gaseous product stream by electrochemical conversion of a liquid phase electrolyte in a bank of two or more electrolytic cells, each cell comprising a cell body having an anode and a cathode; an inlet means; outlet means for a gaseous product and for at least depleted liquid phase electrolyte; a common collection means for gaseous product stream; and a common collection means for at least depleted liquid phase electrolyte; the improvement which comprises (a) a single first temperature sensing means positioned in the common collection means for gaseous product stream; and (b) means to monitor an output signal from said single first sensing means.
Claim 15
Dependent Claim
110 words
In an apparatus for producing a gaseous product stream by electrochemical conversion of a liquid phase electrolyte in a bank of two or more electrolytic cells, each cell comprising a cell body having an anode and a cathode; an inlet means; outlet means for a gaseous product and for at least depleted liquid phase electrolyte; a common collection means for gaseous product stream; and a common collection means for at least depleted liquid phase electrolyte; the improvement which comprises (a) a single first temperature sensing means positioned in the common collection means for gaseous product stream; and (b) means to monitor an output signal from said single first sensing means.
Claim 16
Dependent Claim
45 words
The apparatus as described in claim 13 wherein the improvement further comprises a single second temperature means positioned in the common collection means for the depleted liquid phase and means to measure a difference between the output signals of the first and second sensing means.
Claim 17
Dependent Claim
28 words
The apparatus as described in claim 13 wherein the improvement further comprises a diaphram or permselective membrane separating each cell into a cathode compartment and an anode compartment.
Claim 18
Dependent Claim
14 words
The apparatus as described in claim 13 wherein the anode and cathode are bipolar.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |