Patent US4329209A successfully refreshed from Google Patents.
US4329209A
Expired / Lapsed
US
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Process using an oxidant depolarized solid polymer electrolyte chlor-alkali cell
Assignee: PPG Industries Inc
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Filing: 1981-01-23
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Granted: 1982-05-11
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Expires: 2001-01-23
Abstract
Abstract Disclosed is the ultrasonic treatment of a solid polymer electrolyte to dislodge reaction products. Also disclosed is the use of an amide anodic surface to provide a hydrophobic surface. Disclosed is a SPE chlor-alkali cell having COOH p.i.m., and oxidation of the catholyte. The catholyte oxidant may be a peroxy compound, or it may be carried by an oxygen bearing particle. Alternatively, it may be a redox couple. Catalysts are disclosed. The use of an Si bipolar unit is disclosed.
Inventors
- 👤 Harlan B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:10
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B11/042; C25B11/046; C25B11/047; C25B11/048; C25B9/00; C25B9/05; C25B9/13; C25B9/60; C25B9/65; C25B9/67; C25B9/70; C25B9/73; C25B9/75; C25B9/77
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding a peroxide to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 2
Dependent Claim
114 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding a peroxide to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the peroxide is chosen from the group consisting of hydrogen peroxide, organic hydroperoxides, organic peroxides, organic peroxy acids, and derivatives thereof.
Claim 4
Dependent Claim
118 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding an oxidant of a redox couple to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 5
Dependent Claim
118 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding an oxidant of a redox couple to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 6
Dependent Claim
12 words
The method of claim 3 wherein the oxidant is a cupric compound.
Claim 7
Dependent Claim
22 words
The method of claim 4 comprising feeding the cupric compound to the catholyte compartment, and recovering a catholyte liquor containing cuprous ions.
Claim 8
Dependent Claim
10 words
The method of claim 3 wherein the oxidant is quinone.
Claim 9
Dependent Claim
19 words
The method of claim 6 comprising feeding quinone to the catholyte compartment, and recovering a catholyte liquor containing hydroquinone.
Claim 10
Dependent Claim
115 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding oxidant containing particles to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 11
Dependent Claim
115 words
In a method of electrolysis comprising feeding an aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte having an anodic electrocatalyst facing the anolyte compartment and a cathodic electrocatalyst facing the catholyte compartment; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising providing a cathode depolarization catalyst on the cathodic side of the solid polymer electrolyte, and feeding oxidant containing particles to said catholyte compartment whereby to avoid hydrogen evolution at the cathodic surface of the solid polymer electrolyte.
Claim 12
Dependent Claim
101 words
In a method of electrolysis comprising feeding aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte comprising a fluorinated cation exchange membrane having carboxylic acid groups as the ion exchange groups, an anodic electrocatalyst on the anodic surface thereof, and a cathodic electrocatalyst on the cathodic surface thereof; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising applying ultrasonic energy to said solid polymer electrolyte.
Claim 13
Dependent Claim
101 words
In a method of electrolysis comprising feeding aqueous alkali metal chloride brine to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte comprising a fluorinated cation exchange membrane having carboxylic acid groups as the ion exchange groups, an anodic electrocatalyst on the anodic surface thereof, and a cathodic electrocatalyst on the cathodic surface thereof; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising applying ultrasonic energy to said solid polymer electrolyte.
Claim 14
Dependent Claim
92 words
In a method of electrolysis comprising feeding aqueous alkali metal chloride to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte comprising a permionic membrane having an anodic electrocatalyst on the anodic first surface thereof and a cathodic electrocatalyst on the cathodic second surface thereof; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising applying ultrasonic energy to the solid polymer electrolyte.
Claim 15
Dependent Claim
92 words
In a method of electrolysis comprising feeding aqueous alkali metal chloride to an electrolytic cell having an anolyte compartment separated from a catholyte compartment by a solid polymer electrolyte, said solid polymer electrolyte comprising a permionic membrane having an anodic electrocatalyst on the anodic first surface thereof and a cathodic electrocatalyst on the cathodic second surface thereof; imposing an electrical potential across the solid polymer electrolyte; and withdrawing chlorine from the anolyte compartment and alkali metal hydroxide from the catholyte compartment; the improvement comprising applying ultrasonic energy to the solid polymer electrolyte.
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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |