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US4279712A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for electrolyzing hydrochloric acid

Assignee: ThyssenKrupp Nucera Japan Ltd
•
Filing: 1980-02-04
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Granted: 1981-07-21
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Expires: 2000-02-04
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Abstract

Abstract In a method for electrolyzing hydrochloric acid in an electrolysis apparatus, the improvement which comprises the electrolysis apparatus comprising at least two electrolysis cells, each electrolysis cell having at least one anode, at least one cathode and at least one cation exchange membrane therebetween to define an anode compartment and a cathode compartment therein, and the method comprising the steps of (a) feeding hydrochloric acid aqueous solution as a starting material into the anode compartment of a first electrolysis cell and electrolyzing the hydrochloric acid aqueous solution therein, (b) feeding hydrochloric acid aqueous solution discharged from the anode compartment of the first electrolysis cell into the anode compartment of a second electrolysis cell and electrolyzing the hydrochloric acid aqueous solution therein, (c) feeding hydrochloric acid aqueous solution discharged from the anode compartment of the last electrolysis cell of the electrolysis apparatus into the cathode compartment of each of the electrolysis cells in the electrolysis apparatus, (d) and further, for any additional electrolysis cells present in addition to the first and the second electrolysis cells, subsequent to step (b) and prior to step (c), sequentially feeding hydrochloric acid aqueous solution discharged from the anode compartment of a preceding electrolysis cell into the anode compartment of a subsequent electrolysis cell and electrolyzing the hydrochloric acid aqueous solution therein and (e) collecting chlorine gas generated in the anode compartments and hydrogen gas generated in the cathode compartments.

Inventors

  • 👤 Hitoshi Satoh
  • 👤 Shohei Kosaka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 02:53
CPC Classifications
C; C25; C25B; C25B9/00; C25B1/00; C25B1/01; C25B1/24; C25B1/26; C25B15/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 226 words
A method for electrolyzing hydrochloric acid in an electrolysis apparatus, comprising at least two electrolysis cells, each electrolysis cell having at least one anode, at least one cathode and at least one cation exchange membrane therebetween to define an anode compartment and a cathode compartment therein, and said method comprising the steps of (a) feeding hydrochloric acid aqueous solution as a starting material into the anode compartment of a first electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, (b) feeding hydrochloric acid aqueous solution discharged from said anode compartment of said first electrolysis cell into the anode compartment of a second electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, (c) feeding hydrochloric acid aqueous solution discharged from the anode compartment of the last electrolysis cell of said electrolysis apparatus into the cathode compartment of each of said electrolysis cells in said electrolysis apparatus, (d) and further, for any additional electrolysis cells present in addition to said first and said second electrolysis cells, subsequent to step (b) and prior to step (c), sequentially feeding hydrochloric acid aqueous solution discharged from the anode compartment of a preceding electrolysis cell into the anode compartment of a subsequent electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, and (e) collecting chlorine gas generated in the anode compartments and hydrogen gas generated in the cathode compartments.
Claim 2
Independent Claim 226 words
A method for electrolyzing hydrochloric acid in an electrolysis apparatus, comprising at least two electrolysis cells, each electrolysis cell having at least one anode, at least one cathode and at least one cation exchange membrane therebetween to define an anode compartment and a cathode compartment therein, and said method comprising the steps of (a) feeding hydrochloric acid aqueous solution as a starting material into the anode compartment of a first electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, (b) feeding hydrochloric acid aqueous solution discharged from said anode compartment of said first electrolysis cell into the anode compartment of a second electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, (c) feeding hydrochloric acid aqueous solution discharged from the anode compartment of the last electrolysis cell of said electrolysis apparatus into the cathode compartment of each of said electrolysis cells in said electrolysis apparatus, (d) and further, for any additional electrolysis cells present in addition to said first and said second electrolysis cells, subsequent to step (b) and prior to step (c), sequentially feeding hydrochloric acid aqueous solution discharged from the anode compartment of a preceding electrolysis cell into the anode compartment of a subsequent electrolysis cell and electrolyzing said hydrochloric acid aqueous solution therein, and (e) collecting chlorine gas generated in the anode compartments and hydrogen gas generated in the cathode compartments.
Claim 3
Dependent Claim 44 words
The method of claim 1, wherein the hydrochloric acid aqueous solution discharged from the anode compartment of the last electrolysis cell of said electrolysis apparatus is simultaneously divided and fed into the cathode compartment of each of the electrolysis cells of said electrolysis apparatus.
Claim 4
Dependent Claim 98 words
The method of claim 1, wherein the hydrochloric acid aqueous solution discharged from the anode compartment of the last electrolysis cell of said electrolysis apparatus is fed into the cathode compartment of the last electrolysis cell of said electrolysis apparatus, hydrochloric acid aqueous solution discharged from the cathode compartment of the last electrolysis cell of said electrolysis apparatus is fed into the cathode compartment of the immediately preceding electrolysis cell, and likewise, hydrochloric acid aqueous solution discharged from the cathode compartment of each electrolysis cell is then fed into the cathode compartment of the immediately preceding electrolysis cell.

References Cited (Backward Citations)

US4057474A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-07-20 1985-01-19 1985-07-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-07-20 1989-01-19 1989-07-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-07-20 1993-01-19 1993-07-21 $7700.00 Window Closed / Lapsed

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