• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This invention relates to electrolysis apparatus 10 adapted to produce oxygenated and hydrogenated fluid, formed during the electrolysis of an electrolytic solution passed into the apparatus 10. The apparatus 10 comprises a first and second outer end members 12 and 14 and first and second permeable electrodes 16 and 18 spaced from one another. Each permeable electrode 16 and 18 are of a foraminous or perforated material. An inlet chamber 20 has two inlets 26 for allowing electrolytic solution to pass into said chamber 20. The apparatus 10 also has an oxygen outlet 28 as well as a hydrogen outlet 30. The flow of electrolytic solution through the permeable electrodes 16 and 18 will carry with it the oxygen and hydrogen gasses generated on the positive and negative (first and second) permeable electrodes respectively.
    公开号:AU2013217231A1
    申请号:U2013217231
    申请日:2013-02-11
    公开日:2014-08-28
    发明作者:George Anagnostopoulos
    申请人:Hydrox Holdings Ltd；
    IPC主号:C25B1-06
    专利说明:
    WO 2013/118104 PCT/IB2013/051109 1 METHOD AND APPARATUS FOR PRODUCING GAS FIELD OF THE INVENTION This invention relates to a method and apparatus for producing gas. More 5 particularly, but not exclusively, this invention relates to an electrolysis cell and method in which combustible gasses, such as hydrogen gas and oxygen gas are produced through the electrolysis of an aqueous electrolytic solution and are kept separate upon production. 10 BACKGROUND TO THE INVENTION An electrolysis cell uses electricity to convert water to hydrogen and oxygen in gas phase. Known electrolysis cells consist of either: a liquid alkaline electrolyser which 15 utilizes a porous membrane between the electrodes to separate the hydrogen and oxygen gases or a polymer electrolyte electrolyser which utilizes a proton exchange membrane in order to separate the hydrogen and oxygen gases produced through the electrolysis process. The electrolysis cell further includes an anode positioned along a first face of the proton exchange 20 membrane and a cathode positioned along a second opposite face of the proton exchange membrane.
    WO 2013/118104 PCT/IB2013/051109 2 Known membranes in liquid alkaline electrolysers are generally made from porous plastics whilst in polymer electrode electrolysers the known proton exchange membranes are semi-permeable membranes generally made from ionomers and designed to conduct protons while being impermeable to 5 gases, such as oxygen and hydrogen. Proton exchange membranes can be made from either pure polymer membranes or from composite membranes where other materials are embedded in a polymer matrix. A first disadvantage of all types of membranes is the current flow restriction 10 brought about it. A further disadvantage brought about by the membranes is the increase in distance between the electrodes which results in increased resistance A further disadvantage of the known Liquid Alkaline Membranes is the 15 decrease of efficiency with an increase in current density. The efficiency of the known proton exchange membranes goes down as the voltage applied across the cell goes up, due to poor gas removal from the membrane. Also, the electrodes cannot be stacked too close together, as this will inhibit gas removal. 20 A further disadvantage of the known Liquid Alkaline Membranes is its inability to function effectively under high temperatures and high pressure.
    WO 2013/118104 PCT/IB2013/051109 3 A further disadvantage of the known proton exchange membrane is the high cost of the membrane, since it requires that a noble-metal catalyst (typically platinum) be used to separate the hydrogen's electrons and protons. The platinum catalyst is also extremely sensitive to carbon monoxide poisoning, 5 making it necessary to employ an additional reactor to reduce carbon monoxide in the fuel gas if the hydrogen is derived from an alcohol or hydrocarbon fuel. This again adds to the cost of using the known proton exchange membrane. 10 Further disadvantages of the know proton exchange membranes are their poor conductivity at lower relative humidity and their poor mechanical properties at temperatures above approximately 100 OC. The operating temperature of these membranes is relatively low and temperatures near 100 0 C are not high enough to perform useful cogeneration. 15 Prior art document PCT/IB2011/053050 in the name of HYDROX HOLDINGS LIMITED entitled "Method and apparatus for producing gas", describes the use of a liquid alkaline electrolyser employing a hydrodynamic barrier instead of a porous or proton exchange membrane to achieve electrolysis. This 20 invention results in a huge improvement in terms of manufacturing and operating costs and size.
    WO 2013/118104 PCT/IB2013/051109 4 In this specification, the term "combustible fluid" includes within its scope combustible gas containing predominantly hydrogen and/or oxygen in gas phase. 5 OBJECT OF THE INVENTION It is accordingly an object of the present invention to provide a method and apparatus for producing gas, with which the above disadvantages may be overcome and which are useful alternatives to known electrolysis cells and methods for producing gas. 10 SUMMARY OF THE INVENTION According to a first aspect of the invention there is provided a method for producing combustible fluid from a liquid alkaline electrolytic solution during a process of electrolysis including the steps of: 15 providing an electrolytic solution; providing an electrolysing apparatus having first and second spaced apart permeable electrodes, immersed in a chamber having at least one inlet and two outlets; passing the solution into the chamber via the inlet; and 20 applying a voltage to the apparatus across the electrodes to electrolyse the solution between the electrodes so that a first combustible fluid forms on the first electrode and a second combustible fluid forms on the second electrode, and the first combustible fluid passes from the first electrode and into the first WO 2013/118104 PCT/IB2013/051109 5 outlet and the second combustible fluid passes from the second electrode and into the second outlet, and wherein the first and second electrodes may be provided in relative close proximity to one another in a range of between 1 mm and 6 mm. 5 The electrolytic solution may be potassium hydroxide (KOH) or sodium hydroxide (NaOH). The combustible fluid may be hydrogenated and oxygenated fluid and more 10 specifically the combustible fluid may be hydrogen and oxygen gas. The permeable electrodes may each be perforated or foraminous. Each permeable electrode may further be of a mesh or foam material. 15 Each permeable electrode may be made of a material selected from the group including stainless steel, nickel, palladium, cobalt or platinum material. The first and second electrodes may be substantially parallel. 20 The first and second permeable electrodes may have a correct and predetermined ratio of open to closed area also known as the PPI (pores per WO 2013/118104 PCT/IB2013/051109 6 square inch), which may be influenced by the size of the outlets and the pressure with which the solution is provided to the apparatus. The first and second permeable electrodes may be one set of permeable 5 electrodes and the apparatus may include a plurality of sets of permeable electrodes, all having a similar configuration. The electrolysing apparatus may define at least one inlet in fluid flow communication with all of the inlets and the method may include the step of 10 passing the solution to the chambers of all of the sets of permeable electrodes via an inlet manifold. The first combustible fluid outlet passage may be in fluid flow communication with all of the first combustible fluid outlets of all of the sets of permeable 15 electrodes and the second combustible fluid outlet passage may be in fluid flow communication with all of the second combustible fluid outlets of all of the sets of permeable electrodes, the arrangement being such that the first combustible fluid formed on the first electrode passes out of the apparatus via the first combustible fluid outlet and the second combustible fluid formed 20 on the second electrode passes out of the apparatus via the second combustible fluid outlet .
    WO 2013/118104 PCT/IB2013/051109 7 According to a second aspect of the invention there is provided an electrolysing apparatus in which combustible fluid is produced from an electrolytic solution, namely potassium hydroxide (KOH) or sodium hydroxide (NaOH) in a process of liquid alkaline electrolysis comprising: 5 first and second spaced apart permeable electrodes immersed in an inlet chamber; at least one inlet into the inlet chamber for passing the electrolytic solution into said inlet chamber; and - a first and second combustible fluid outlets; 10 the arrangement being such that the electrolytic solution passes into the inlet chamber via the inlet where electrolysis takes place; and such that a first combustible fluid forms on the first electrode; and such that a second combustible fluid forms on the second electrode; and further such that the first combustible fluid passes from the first electrode into 15 the first combustible fluid outlet; and the second combustible fluid passes from the second electrode into the second combustible fluid outlet, and wherein the first and second electrodes may be provided in relative close proximity to one another in a range of between 1 mm and 6 mm. 20 The electrolyte may be potassium hydroxide (KOH) or sodium hydroxide (NaOH) at concentrations ranging from 20% to 50%.
    WO 2013/118104 PCT/IB2013/051109 8 The combustible fluid may be hydrogenated and oxygenated fluid and more specifically the combustible fluid nay be hydrogen and oxygen gas. The permeable electrodes may each be perforated or foraminous. 5 Each permeable electrode may further be of a mesh or foam material. Each permeable electrode may be made of a material selected from the group including stainless steel, nickel, palladium, cobalt or platinum material. 10 The first and second electrodes may be substantially parallel. The first and second electrodes may each include at least one connector tab for connecting to a power supply to supply a voltage over the electrolysing 15 apparatus to electrolyse the electrolytic solution. The first and second electrodes may be attached to stainless steel couplers, fixed to the connector tab for distribution of current around the electrodes. 20 A PVC sleeve keeps each of the electrodes firmly attached to the coupler, and electrically isolates the coupler from the electrolyte.
    WO 2013/118104 PCT/IB2013/051109 9 The first and second permeable electrodes may have a correct and predetermined ratio of open to closed area (or PPI), which may be influenced by the size of the outlets and the pressure with which the solution is provided to the apparatus. 5 The apparatus may include first and second outer end members, each being of polyethylene. The apparatus may be cylindrical, square or multi-agonal in shape. 10 The apparatus may include circulating means, such as a pump, to circulate the solution through the apparatus and to force the solution into the inlet chamber. 15 The apparatus may include a first combustible fluid collection container connected to the first combustible fluid outlet and a second combustible fluid collection container connected to the second combustible fluid outlet. BRIEF DESCRIPTION OF THE DRAWINGS 20 The invention will now be described further by way of non-limiting examples with reference to the accompanying drawings wherein: WO 2013/118104 PCT/IB2013/051109 10 figure 1 is a cross sectional view of an electrolysis apparatus according to a first preferred embodiment of the invention; figure 2 is an exploded perspective view of part of an electrolysis 5 apparatus according to a second preferred embodiment of the invention; and figure 3 is a cross sectional view of a single electrode of the apparatus of figure 2. 10 DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Referring to the drawings, an electrolysis apparatus according to a preferred embodiment of the invention is generally designated by reference numeral 10. 15 The electrolysis apparatus 10 is adapted to produce oxygenated and hydrogenated fluid, formed during the electrolysis of an electrolytic solution passed into the apparatus 10. 20 The apparatus 10 comprises a first outer end member 12, being of polyethylene, and a second outer end member 14, also being of polyethylene.
    WO 2013/118104 PCT/IB2013/051109 11 Referring to figure 1, the first and second outer end members 12 and 14 are both square shaped and are arranged generally parallel to one another and are spaced from one another. It is foreseen that the apparatus could be multi agonal or circular in shape and not necessarily be square, such as is shown 5 in figure 2. The apparatus 10 further includes two spaced apart permeable electrodes, a first permeable electrode 16 and a second permeable electrode 18. The permeable electrode 16 and 18 are each of a foraminous or perforated 10 material. Specifically the permeable electrodes are each of stainless steel 316 mesh (such as Dutch weave wire mesh). The two permeable electrodes 16 and 18 are also arranged generally parallel to one another, are relatively closely spaced from one another, in the range of between 1 mm and 6 mm. An inlet chamber 20 surrounds the first and second permeable electrodes 16 15 and 18. The closer the permeable electrodes 16 and 18 are spaced to each other, results in a lower resistance between them, which means less voltage needs to be applied to the apparatus 10, which results in a more efficient apparatus 20 10. Referring to figure 1, in a first embodiment of the invention, the two permeable membranes are spaced apart by 4 mm, with a mesh diameter of WO 2013/118104 PCT/IB2013/051109 12 20 mm, a mesh area of 314 mm 2 and mesh thickness of 0.8 mm. This combination of dimensions results in a current density of 73 mA/cm 2 , utilising 50% KOH as electrolyte concentration at a temperature of 60*C, with an applied voltage of 1.765 VDC. It is foreseen by the applicant that this figure 5 could significantly improve by using higher electrolyte temperatures and reducing the spacing between the electrodes to below 4 mm. The electroplating of the electrodes by Platinum will also greatly enhance the catalytic effectiveness of the electrodes. 10 The first and second electrodes may be attached to stainless steel couplers 24 fixed to the connector tab for distribution of current around the electrodes. A PVC sleeve 22 keeps the electrode firmly attached to the coupler, and electrically isolates the coupler from the electrolyte. 15 The inlet chamber 20 has two inlets 26 for allowing electrolytic solution to pass into said chamber 20. The apparatus 10 also has an oxygen outlet 28 as well as a hydrogen outlet 30. The flow of electrolytic solution through the permeable electrodes 16 and 18 20 will carry with it the oxygen and hydrogen gasses generated on the positive and negative (first and second) permeable electrodes respectively. There is thus a natural separation of the hydrogen and oxygen gasses. The close WO 2013/118104 PCT/IB2013/051109 13 proximity of the electrodes 16 and 18 also permits hydrolyzing at very low voltage, permitting high efficiency and high purity hydrogen and oxygen. The first and second permeable electrodes 16 and 18 form a set of 5 permeable electrodes. The apparatus 10 could include a plurality of sets of permeable electrodes arranged and connected to one another in a back-to front or parallel arrangement. The first and second electrodes 16 and 18 include conductive connector tabs 10 or plates (one being the positive terminal and the other being the negative terminal) for connecting to a power supply (not shown), such as a battery. The powers supply thus supplies a voltage of between 1 V and 6 V, over the electrolysing apparatus 10 to electrolyse the solution. The present apparatus 10 produces hydrogen and oxygen by applying either a pure DC voltage or 15 pulsed DC voltage to the apparatus. The apparatus 10 further includes a circulating means, such as a pump (not shown) to circulate the solution through the apparatus 10. The electrolytic solution flowing into the chamber 20 via the inlets 26 is pressurised by being 20 pumped into the apparatus 10 by the pump, so that the solution is forced through the permeable electrodes 16 and 18. The arrangement is such that electrolytic solution flows into the first chamber 20 via the inlets 26, through the permeable electrodes 16 and 18. Electrolytic action takes place between WO 2013/118104 PCT/IB2013/051109 14 the first and second permeable electrodes 16 and 18 respectively. The oxygenated fluid passes out via the oxygen outlet 28 and the hydrogenated fluid passes out via the hydrogen outlet 30. 5 The apparatus 10 could further include a hydrogen collection container (not shown) connected to the hydrogen outlet 30 and an oxygen collection container (also not shown) connected to the oxygen outlet 28. The oxygen and hydrogen collection containers each have a second electrolytic solution outlet located towards the operatively bottom end of the containers and 10 oxygen and hydrogen gas outlets located towards the operatively top end of each of the oxygen and hydrogen collection containers, respectively. Electrolytic solution passes out of the oxygen and hydrogen outlets 28 and 30, together with the respective gases, into the oxygen and hydrogen collection containers. The arrangement is such that hydrogen and oxygen 15 gases within the fluids passing into the respective containers are released through gravity and surface tension, and passed out of the containers via the oxygen and hydrogen gas outlets and the electrolytic solution passes out of the containers via the second electrolytic solution outlets. The second electrolytic solution outlets are connected to the inlets 26 and the solution is 20 circulated back to the apparatus 10 by means of the pump. The gasses are thus stored for later use.
    WO 2013/118104 PCT/IB2013/051109 15 It is foreseen that there is a positive flow from the first chamber 20 to the oxygen and hydrogen outlets 28 and 30 of the apparatus 10. The pressurised flow of the electrolytic solution from the first chamber 20 to the oxygen and hydrogen outlets 28 and 30, through the permeable electrodes, restricts 5 oxygen gas and hydrogen gas, after formation on the first and second permeable electrodes 16 and 18, from entering the first chamber 20. It is foreseen that ionic flow in the apparatus occurs against and with the flow of electrolyte, being a unique feature of the current setup. 10 It is further foreseen that the electrolysis apparatus essentially does not have a membrane, as in the case of prior art apparatus and that gas bubbles forming on the electrodes are immediately removed with the flow of electrolyte. This has a number of advantages, for example, the cost of both a wet or dry membrane is removed, along with the cost of maintaining the membranes. Further, current 15 density conventionally drops as gas bubbles form on the electrodes, however, in the current setup, the gas bubbles are immediately removed so as to maintain a constant current density. It is hugely significant that with a current density of 11,000 mA/cm, the gas bubbles were still kept separated. 20 The fact that there is no membrane present, also removes the pressure and temperature limitations that are usually present with the use of membranes. In the present invention, permeable electrodes are used, which do not allow for shaded conduction areas to be created by the movement of gasses across the WO 2013/118104 PCT/IB2013/051109 16 electrode surface. This increases the effective conduction area of the electrode, reduces the effective voltage requirement and thereby improves efficiency resulting in a reduction in operating costs. 5 It is also further foreseen that with a reduction of the spacing between electrodes, a higher current density and increased efficiency can be achieved. It will be appreciated that variations in detail are possible with a method and apparatus for producing hydrogen and oxygen gasses according to the 10 invention without departing from the scope of the appended claims.
    权利要求:
    Claims (25)
    [1] 1. A method for producing combustible fluid from a liquid alkaline electrolytic solution during a process of electrolysis including the steps 5 of: providing an electrolytic solution; providing an electrolysing apparatus having first and second spaced apart permeable electrodes, immersed in a chamber having at least one inlet and two outlets; passing the solution into the chamber via the inlet; and applying a voltage to the apparatus across the electrodes to electrolyse the 10 solution between the electrodes so that a first combustible fluid forms on the first electrode and a second combustible fluid forms on the second electrode, and the first combustible fluid passes from the first electrode and into the first outlet and the second combustible fluid passes from the second electrode and into the second outlet, and 15 wherein the first and second electrodes are provided in relative close proximity to one another in a range of between 1 mm and 6 mm.
    [2] 2. A method according to claim 1 wherein the electrolytic solution is potassium hydroxide (KOH) or sodium hydroxide (NaOH). 20
    [3] 3. A method according to claim 1 or 2 wherein the combustible fluid is hydrogenated and oxygenated fluid. WO 2013/118104 PCT/IB2013/051109 18
    [4] 4. A method according to claim 3 wherein the muscle fluid is hydrogen and oxygen gas.
    [5] 5. A method according to any one of the preceding claims wherein the 5 permeable electrodes are each perforated or foraminous.
    [6] 6. A method according to claim 5 wherein each permeable electrode is further a mesh or foam material. 10 7. A method according to any one of the preceding claims wherein each permeable electrode is made of a material selected from the group including stainless steel, nickel, palladium, cobalt or platinum material.
    [7] 8. A method according to any one of the preceding claims wherein the 15 first and second electrodes are substantially parallel.
    [8] 9. A method according to any one of the preceding claims wherein the first and second permeable electrodes have a correct and predetermined ratio of open to closed area also known as the PPI 20 (pores per square inch), which is influenced by the size of the outlets and the pressure with which the solution is provided to the apparatus. WO 2013/118104 PCT/IB2013/051109 19
    [9] 10.A method according to any one of the preceding claims wherein the first and second permeable electrodes are a set of permeable electrodes and the apparatus includes a plurality of sets of permeable electrodes, all having a similar configuration. 5
    [10] 11.A method according to claim 10 wherein the electrolysing apparatus defines at least one inlet in fluid flow communication with all of the inlets and the method includes the step of passing the solution to the chambers of all of the sets of permeable electrodes via an inlet 10 manifold.
    [11] 12.A method according to claim 11 wherein the first combustible fluid outlet passage is in fluid flow communication with all of the first combustible fluid outlets of all of the sets of permeable electrodes and 15 the second combustible fluid outlet passage is in fluid flow communication with all of the second combustible fluid outlets of all of the sets of permeable electrodes, the arrangement being such that the first combustible fluid formed on the first electrode passes out of the apparatus via the first combustible fluid outlet and the second 20 combustible fluid formed on the second electrode passes out of the apparatus via the second combustible fluid outlet . WO 2013/118104 PCT/IB2013/051109 20 13An electrolysing apparatus in which combustible fluid is produced from an electrolytic solution, namely potassium hydroxide (KOH) or sodium hydroxide (NaOH) in a process of liquid alkaline electrolysis comprising: first and second spaced apart permeable electrodes 5 immersed in an inlet chamber; at least one inlet into the inlet chamber for passing the electrolytic solution into said inlet chamber; and a first and second combustible fluid outlets; the arrangement being such that the electrolytic solution passes into the inlet chamber via the inlet where electrolysis takes place; and such that a first combustible fluid 10 forms on the first electrode; and such that a second combustible fluid forms on the second electrode; and further such that the first combustible fluid passes from the first electrode into the first combustible fluid outlet; and the second combustible fluid passes from the second electrode into the second combustible fluid outlet, and 15 wherein the first and second electrodes are provided in relative close proximity to one another in a range of between 1 mm and 6 mm.
    [12] 14.An electrolysing apparatus according to claim 13 wherein the electrolyte is potassium hydroxide (KOH) or sodium hydroxide (NaOH) 20 at concentrations ranging from 20% to 50%.
    [13] 15.An electrolysing apparatus according to claim 13 or 14 wherein the combustible fluid is hydrogenated and oxygenated fluid. WO 2013/118104 PCT/IB2013/051109 21
    [14] 16.An electrolysing apparatus according to claim 15 wherein the combustible fluid is hydrogen and oxygen gas.
    [15] 17.An electrolysing apparatus according to any one of claims 13 to 16 5 wherein the permeable electrodes are each perforated or foraminous.
    [16] 18.An electrolysing apparatus according to any one of claims 13 to 17 whrein each permeable electrode is further of a mesh or foam material. 10
    [17] 19.An electrolysing apparaus according to any one of claims 13 to 18 wherein each permeable electrode is made of a material selected from the group including stainless steel, nickel, palladium, cobalt or platinum material, 15
    [18] 20.An eectrossng apparatus according to any one of claims 13 to 19 'hrIn he-rt n secondelctrde are substatal aall 21 An electrolysing apparatus according to any one of im 13 to 20 20 wherein the first and send d electrodes each include at least one connector tab for connecting to a power supply to supply a voltage over the electrolysing apparatus to electrolyse the electrolytic solution. WO 2013/118104 PCT/IB2013/051109 22
    [19] 22.An electrolysing apparatus according to claim 21 wherein the first and second electrodes are attached to stainless steel couplers, fixed to the connector tab for distribution of current around the electrodes. 5 23.An electrolysing apparatus according to claim 22 wherein a PVC sleeve keeps each of the electrodes firmly attached to the coupler, and electrically isolates the coupler from the electrolyte.
    [20] 24.An electrolysing apparatus according to any one of claims 13 to 23 10 wherein the first and second permeable electrodes have a correct and predetermined ratio of open to closed area (or PPI), which is influenced by the size of the outlets and the pressure with which the solution is provided to the apparatus. 15 25.An electrolysing apparatus according to any one of claims 13 to 24 which includes first and second outer end members, each being of polyethylene.
    [21] 26.An electrolysing apparatus according to any one of claims 13 to 25 20 which is cylindrical, square or multi-agonal in shape.
    [22] 27.An electrolysing apparatus according to any one of claims 13 to 26 which includes circulating means, such as a pump, to circulate the WO 2013/118104 PCT/IB2013/051109 23 solution through the apparatus and to force the solution into the inlet chamber.
    [23] 28.An electrolysing apparatus according to any one of claims 13 to 27 5 which includes a first combustible fluid collection container connected to the first combustible fluid outlet and a second combustible fluid collection container connected to the second combustible fluid outlet.
    [24] 29.A method for producing combustible fluid substantially as described 10 herein with reference to the accompanying drawings.
    [25] 30.An electrolysing apparatus in which combustible fluid is produced substantially as described herein with reference to the accompanying drawings. 15
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    法律状态:
    2018-01-18| FGA| Letters patent sealed or granted (standard patent)|
    优先权:
    申请号 | 申请日 | 专利标题
    ZA2012/00696||2012-02-10||
    ZA201200696||2012-02-10||
    PCT/IB2013/051109|WO2013118104A1|2012-02-10|2013-02-11|Method and apparatus for producing gas|
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