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AssigneePermelec Electrode Ltd.
InventorsMadhu Sudan Saha, Masaharu Uno, Yoshinori Nishiki, Tsuneto Furuta, Tateki Kurosu
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An industrially useful peroxo-carbonate is electrolytically produced using, as a raw material, carbon dioxide that is inexpensive and easily available. A process of producing a peroxo-carbonate, includes feeding a carbon dioxide gas into an electrolytic cell having a gas diffusion anode and a cathode, or feeding a liquid having a carbon dioxide gas dissolved therein into an electrolytic cell having an anode and a cathode, and electrolytically converting the carbon dioxide gas into a peroxo-carbonate. By properly setting up electrolytic conditions such as electrodes, a useful peroxo-carbonate can be produced with high current efficiency using inexpensive carbon dioxide as the raw material.
A process of producing a peroxo-carbonate, which comprises feeding a carbon dioxide gas into an electrolytic cell having a gas diffusion anode and a cathode chamber, feeding oxygen into the cathode chamber to produce hydrogen peroxide, and electrolytically converting the carbon dioxide gas into a peroxo-carbonate.
A process of producing a peroxo-carbonate, which comprises feeding a liquid having a carbon dioxide gas dissolved therein into an electrolytic cell having an anode and a cathode chamber, feeding oxygen into the cathode chamber to produce hydrogen peroxide, and electrolytically converting the carbon dioxide gas into a peroxo-carbonate.
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Electrodes; Manufacture thereof not otherwise provided for: characterised by the material
Characterised by the material: electrodes formed of electrocatalysts on a substrate or carrier
Electrolytic or electrophoretic processes for the production of compounds or non-metals
Term ended 2 Oct 2024 (estimated)
The present invention relates to a production process for synthesizing inexpensively and simply a peroxo-carbonate that is an industrially important oxidizing agent and is used as a bleaching agent or a disinfectant.
Adverse influences against the environment and human bodies due to the atmospheric pollution caused by industrial or living wastes and the deterioration of water quality in rivers and lakes and marshes become serious. Technical countermeasures for solving this problem are an urgent issue. For example, in drinking water, sewage treatment and waste water treatment, chemicals having an oxidizing power have been used for decoloration, reduction of COD, or sterilization. However, because of the use of a large quantity of such chemicals, new dangerous substances, i.e., endocrine disputing chemicals and carcinogenic substances, tend to be formed. Furthermore, in the incineration treatment of final wastes, carcinogenic substances (dioxins) are generated in the waste gas depending upon the incineration condition, thereby influencing the ecological system, and therefore, the safety thereof is of a problem. To solve this problem, a new method is investigated.
Electrolysis method makes it possible to induce a desired electrochemical reaction utilizing clean electric energy. By controlling the chemical reaction on the surface of a cathode, that is, by feeding an oxygen-containing gas and water into a cathode, it is possible to produce hydrogen peroxide. The water treatment of decomposing substances to be treated by utilizing this electrolysis method has hitherto been widely carried out. According to the electrolysis method, it becomes possible to realize the on-site production of hydrogen peroxide. In addition, this electrolysis method overcomes such a defect of hydrogen peroxide that it cannot be stored over a long period of time without using a stabilizing agent. Further, this method is free from a danger following the conveyance and does not require a countermeasure for pollution.
FIG. 1 is a flowchart showing one embodiment of electrolytic lines containing an electrolytic cell capable of being used for the production of a peroxo-carbonate according to the present invention.
FIG. 2 is a flowchart showing another embodiment of electrolytic lines containing an electrolytic cell capable of being used for the production of a peroxo-carbonate according to the present invention.
FIG. 3 is a graph showing the current density dependency of current efficiency in Example 1.
11: Electrolytic solution storage tank 12: Electrolytic solution 13: Carbon dioxide gas cylinder 16: Electrolytic cell for producing peroxo-carbonate 31: Diaphragm type electrolytic cell 32: Diaphragm 34: Gas diffusion anode 35: Anolyte chamber 36: Anode gas chamber 39: Electrolytic solution storage tank 40: Electrolytic solution 41: Carbon dioxide gas cylinder
The present invention is described in detail below.
The “peroxo-carbonate” as referred to herein generically means peroxo-carbonate (H2CO4) itself; peroxo-carbonate compounds, for example, percarbonates such as sodium percarbonates (for example, Na2CO4 or Na2C2O6) or potassium percarbonate; hydrates and/or hydrogen peroxide adducts thereof (for example, Na2CO4.H2O2.0.5H2O, Na2CO4.0.5H2O, or Na2CO4.H2O2); and peroxo-carbonate ions (for example CO42− or C2O62−).