Process and apparatus for producing silver-ionic water

• US 4,755,268 A
• Filed: 05/18/1987
• Issued: 07/05/1988
• Est. Priority Date: 05/28/1986
• Status: Expired due to Term

• Current Assignee: Jin-Ichi Ito, Katsue Oshima, Yoshiaki Matsuo
• Original Assignee: Jin-Ichi Ito, Katsue Oshima, Yoshiaki Matsuo
• Inventors: Matsuo, Yoshiaki, Ito, Jin-ichi, Oshima, Katsue
• Primary Examiner(s): Andrews, R. L.
• Application Number:
  US07/050,437
• Time in Patent Office: 414 Days
• Field of Search: 204/130, 204/131, 204/149, 204/86, 204/269
• US Class Current: 205/746
• CPC Class Codes: C02F 1/4606 for producing oligodynamic substances to disinfect the water
• CPC Class Codes: C02F 1/4618 for producing "ionised" acidic or basic water
• CPC Class Codes: C02F 2001/422 using anionic exchangers
• CPC Class Codes: C02F 2001/425 using cation exchangers
• CPC Class Codes: C02F 2001/46152 characterised by the shape or form electrodes in particulate form or with conductive or non-conductive particles between them C02F1/46114
• CPC Class Codes: C02F 2201/46115 Electrolytic cell with membranes or diaphragms
• CPC Class Codes: C02F 2201/46125 Electrical variables
• CPC Class Codes: C02F 2201/46145 Fluid flow
• CPC Class Codes: C02F 2201/4618 Supplying or removing reactants or electrolyte
• CPC Class Codes: C02F 2209/05 Conductivity or salinity
• CPC Class Codes: C02F 2209/06 pH
• CPC Class Codes: C02F 2303/04 Disinfection
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: C25B 1/00 Electrolytic production of inorganic compounds or non-metals

Abstract

A process for producing silver-ionic water, comprising;

a step of passing water through a first electrolytic cell chamber containing an anode and a cathode and provided with silver on the anode, under the application of a voltage, to dissolve out silver ions; and

a step of passing the water in which said silver ions have been dissolved out, through either one or both of an anode compartment and a cathode compartment of a second electrolytic cell chamber containing an anode and a cathode and separated into said anode compartment and said cathode compartment with a diaphragm formed between both of said electrodes.

The process is useful for producing acidic silver-ionic water and/or alkaline silver-ionic water without causing the formation of colloids even under relatively higher silver ion concentration.

Also disclosed are useful apparatus for practicing the above processes.

Claims

1. A process for producing silver-ionic water, comprising;

a step of passing weter through a first electrolytic cell chamber containing an anode and a cathode and provided with silver on the anode, under the application of a voltage, to dissolve out silver ions; and

a step of passing the water in which said silver ions have been dissolved out, through either one or both of an anode compartment and a cathode compartment of a second electrolytic cell chamber containing an anode and a cathode and separated into said anode compartment and said cathode compartment with a disphragm formed between both of said electrodes;

said disphragm allowing cations to pass from the anode compartment to the cathode compartment and allowing anionic ions to pass from the cathode compartment to the anode compartment, whereby the water passed from the first electrolytic cell chamber through the anode compartment of the second electrolytic cell chamber turns to acidic silver-ionic water and the water passed from the first electrolytic cell chamber through the cathode compartment of the second electrolytic cell chamber turns to alkaline silver-ionic water.

2. The process according to claim 1, wherein said acidic silver-ionic water has the pH of 5 or less and an electric conductance of 350 to 2000 μ

/cm³ and said alkaline silver-ionic water has the pH of 8 or more.

3. An apparatus for producing silverionic water, comprising;

a first electrolytic cell chamber containing an anode and a cathode and provided with silver on the anode,

a second electrolytic cell chamber containing an anode and a cathode and separated into an anode compartment and a cathode compartment with a diaphragm formed between both of said electrodes;

a least one of a flow path in which water is passed from said first electrolytic cell chamber through anode compartment of said second electrolytic cell chamber and flowed out, and a flow path in which water is passed from said first electrolytic cell chamber through the cathode compartment of said second electrolytic cell chamber and flowed out;

said diaphragm allowing cations to pass from the anode compartment to the cathode compartment and allowing anionic ions to pass from the cathode compartment to the anode compartment, whereby the water passed from the first electrolytic cell chamber through the anode compartment of the second electrolytic cell chamber turns to acidic silver-ionic water and the water passed from the first electrolytic cell chamber through the cathode compartment of the second electrolytic cell chamber turns to alkaline silver-ionic water.

4. The apparatus according to claim 3, wherein said apparatus further comprises a flow path in which the water is directly passed though said anode compartment of the second electrolytic cell chamber and flowed out, and another flow path in which the water is directly passed through said cathode compartment of the second electrolytic cell chamber and flowed out.

5. A process for producing silver-ionic water, comprising;

(a) subjecting water to a demineralizing treatment to decrease ionic substances in the water;

(b) adding an organic carboxylic acid to the ion-decreased water;

(c) passing the water to which the organic carboxylic acid has been added, through a first electrolytic cell chamber containing an anode and a cathode and provided with silver on the anode, under the application of a voltage, to dissolve, out silver ions;

(d) passing under the application of a directcurrent voltage the water in which said silver ions have been dissolved out, through at least a cathode compartment side of a second electrolytic cell chamber containing an anode and a cathode and separated into an anode compartment and the cathode compartment with a diaphragm formed between both of said electrodes; and

(e) adding sodium chloride to the water having been passed through said cathode compartment so that silver may be present in the water as a soluble complex;

said diaphragm allowing cations to pass from the anode compartment to the cathode compartment and allowing anionic ions to pass from the cathode compartment to the anode compartment, whereby the water passed from the first electrolytic cell chamber through the anode compartment of the second electrolytic cell chamber turns to acidic silverionic water and the water passed from the first electrolytic cell chamber through the cathode compartment of the second electrolytic cell chamber turns to alkaline silver-ionic water.

6. The process according to claim 5, wherein said water in step (a) is demineralized to have an electric conductance of 30 to 150 μ

/cm³.

7. The process according to claim 5, wherein said organic carboxylic acid is acetic acid.

8. The process according to claim 5, wherein said carboxylic acid is added in an amount of 0.01 to 0.4% by weight based on said water in step (b).

9. The process according to claim 5, wherein said sodium chloride is added in an amount of 1 to 10% by weight based on said water in step (e).

10. An apparatus for producing silver-ionic water, comprising;

an ion exchange chamber filled with an ion exchange material;

a first mixing bath having an organic carboxylic acid feeding means;

a first electrolytic cell chamber containing an anode and a cathode and provided with silver on the anode;

a second electrolytic cell chamber having an anode and a cathode and separated into an anode compartment and a cathode compartment with a diaphragm formed between both of said electrodes; and

a second mixing bath having sodium chloride feeding means;

in such a juxtaposition that a water-feeding pipe is connected to an inlet of the ion exchange chamber, an outlet of the ion exchange chamber is connected to an inlet of the first mixing bath, an outlet of the first mixing bath is connected to an inlet of the first electrolytic cell chamber, an outlet of the first electrolytic cell chamber is separately connected to the anode compartment and cathode compartment of the second electrolytic cell chamber, the cathode compartment of the second electrolytic cell chamber is connected to the second mixing bath, a pipe for feeding additional water is connected to the flow path connecting the first electrolytic cell chamber and the anode compartment in the second electrolytic cell chamber, and a valve is provided for selectively flowing the water passed through the first electrolytic cell chamber or the additional water, into the anode compartment of the second electrolytic cell chamber, to form a flow path in which water is flowed out after being passed from said ion exchange chamber through said first mixing bath, said first electrolytic cell chamber, the cathode compartment of said second electrolytic cell chamber and said second mixing bath;

said diaphragm allowing cations to pass from the anode compartment to the cathode compartment and allowing anionic ions to pass from the cathode compartment to the anode compartment, whereby the water passed from the first electrolytic cell chamber through the anode compartment of the second electrolytic cell chamber turns to acidic silver-ionic water and the water passed from the first electrolytic cell chamber through the cathode compartment of the second electrolytic cell chamber turns to alkaline silver-ionic water.