Process for the preparation of a disinfectant for water, such as drinking- or swimming-water
First Claim
1. A process for the preparation of a disinfectant for water which comprises the steps of first electrolyzing an aqueous NaCl solution in electrolysis cells to form either (a) in an hypochlorite electrolysis cell without a separated anode and cathode chamber, a residual NaCl solution containing electrolytically formed NaOCl;
- or (b) in an electrolysis cell having an ion-permeable membrane or diaphragm separating the anode and cathode chambers thereof, a residual NaCl solution containing dissolved electrolytically formed Cl2 ;
introducing the yield of (a) or (b) depending upon the configuration of said cell for the first electrolysis into a second electrolysis cell and further electrolyzing the solution (a) of NaCl containing NaOCl in a cell configured by an ion-permeable membrane to convert at least some of the residual NaCl in the solution to dissolved Cl2 gas;
or electrolyzing the solution (b) of residual NaCl containing dissolved Cl2, in a cell configured to convert at least some of said residual NaCl in the solution to NaOCl; and
then adding the resultant disinfecting mixture of NaCl, NaOCl and dissolved Cl to the water to be disinfected.
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Abstract
The invention concerns a process and apparatus for the preparation of a disinfectant for water, such as drinking- or swimming-water by electrolysis of an aqueous NaCl-containing solution.
In order to improve these, the process of the invention is characterized in that an NaOCl-containing solution obtained by electrolysis is enriched with electrolytically obtained Cl2 by either electrolytically preparing an aqueous NaCl and NaOCl-containing solution and further electrolyzing said solution to partially convert the Nacl still present therein into Cl2, or electrolytically preparing a mixture of an aqueous NaCl solution and Cl2, and further electrolyzing said mixture to partially convert the NaCl still present therein into NaOCl.
The apparatus of the invention is characterized by a combination of a first electrolytic cell (1) and a second electrolytic cell (2), which are electrically series-connected, said first electrolytic cell (1) being provided with a brine supply line (8) and a discharge line (10,11) and comprising a plurality of pairs of electrodes (A1, K1. . . A5, K5), no separation being present between the anode and the cathode of each pair of electrodes, and said second electrolytic cell (2) comprising one or more pairs of electrodes (A6, K6), a diaphragm or ion-selective membrane (5) being positioned between the anode (A6) and the cathode (K6) of the or each pair of electrodes, in which second electrolytic cell (2) the anode space(s) (6) is (are) connected to the discharge line (11) of the first electrolytic cell and to a product discharge line (15) , and the cathode space(s) (7) is (are) provided with a supply line (12) and a discharge line (13,14).
42 Citations
5 Claims
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1. A process for the preparation of a disinfectant for water which comprises the steps of first electrolyzing an aqueous NaCl solution in electrolysis cells to form either (a) in an hypochlorite electrolysis cell without a separated anode and cathode chamber, a residual NaCl solution containing electrolytically formed NaOCl;
- or (b) in an electrolysis cell having an ion-permeable membrane or diaphragm separating the anode and cathode chambers thereof, a residual NaCl solution containing dissolved electrolytically formed Cl2 ;
introducing the yield of (a) or (b) depending upon the configuration of said cell for the first electrolysis into a second electrolysis cell and further electrolyzing the solution (a) of NaCl containing NaOCl in a cell configured by an ion-permeable membrane to convert at least some of the residual NaCl in the solution to dissolved Cl2 gas;
or electrolyzing the solution (b) of residual NaCl containing dissolved Cl2, in a cell configured to convert at least some of said residual NaCl in the solution to NaOCl; and
then adding the resultant disinfecting mixture of NaCl, NaOCl and dissolved Cl to the water to be disinfected. - View Dependent Claims (2, 3, 5)
- or (b) in an electrolysis cell having an ion-permeable membrane or diaphragm separating the anode and cathode chambers thereof, a residual NaCl solution containing dissolved electrolytically formed Cl2 ;
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4. The process as claimed in 1, wherein said aqueous NaCl solution is electrolyzed in at least one or more electrically series-connected electrolytic cells, one group of said cells having a plurality of pairs of electrodes in which a diaphragm or ion-selective membrane is positioned to define spaces between the anode and the cathode of each pair of electrodes wherein the products segregated by said diaphragm or membrane leaving the anode and cathodes spaces are quantitatively mixed together to form an aqueous NaCl and dissolved Cl2 -containing solution after which the resulting solution is further electrolyzed in further cells connected in said series where said electrodes are not provided with said product segregating means.
Specification