JP2000199094A - Method for destaticizing gas diffuser electrode - Google Patents
Method for destaticizing gas diffuser electrodeInfo
- Publication number
- JP2000199094A JP2000199094A JP10373787A JP37378798A JP2000199094A JP 2000199094 A JP2000199094 A JP 2000199094A JP 10373787 A JP10373787 A JP 10373787A JP 37378798 A JP37378798 A JP 37378798A JP 2000199094 A JP2000199094 A JP 2000199094A
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- Prior art keywords
- gas diffusion
- diffusion electrode
- welding
- conductor
- cathode current
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、イオン交換膜食塩
電解の酸素陰極、亡硝電解の電極等に用いるガス拡散電
極の溶接固定および排電方法に関し、特にガス拡散電極
から陰極室枠への排電が容易になったガス拡散電極の溶
接固定および排電方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding and fixing a gas diffusion electrode used for an oxygen cathode for ion exchange membrane salt electrolysis, an electrode for sodium nitrite electrolysis, etc. The present invention relates to a method for fixing a gas diffusion electrode by welding and facilitating discharge.
【０００２】[0002]
【従来の技術】従来のガス拡散電極の取付け、排電方法
としては、大別して下記の４種類の方法が利用されてい
た。 １．ガス拡散電極の外周部からの排電 ガス拡散電極の寸法を反応面サイズより大きくし、陰極
室枠のフレーム及び陰極集電枠（平皿型のため「陰極集
電枠パン」ともいわれている、以下同様）のガスケット
シール面に僅かに掛かるサイズにし、ガス拡散電極の外
周部と陰極集電枠を接触させ、そのガス拡散電極の外周
部から陰極集電枠へ排電する方法である。この方法で
は、電解槽を組立、締付けることにより、ガス拡散電極
の外周部と陰極集電枠の接触面も締付けられるので、そ
の箇所の電気接触抵抗は小さくなる。排電経路は、ガス
拡散電極→陰極集電枠→陰極室枠となる。このため、ガ
ス拡散電極の陰極集電枠との接触面は、電気絶縁体であ
ってはならない。2. Description of the Related Art Conventionally, the following four types of methods have been used for attaching and discharging gas diffusion electrodes. 1. Discharge from the outer periphery of the gas diffusion electrode The size of the gas diffusion electrode is made larger than the reaction surface size, and the frame of the cathode chamber frame and the cathode current collection frame (also called “cathode current collection frame pan because of the flat plate type, The same applies to the following), in which the gasket seal surface is slightly sized, the outer periphery of the gas diffusion electrode is brought into contact with the cathode current collecting frame, and the outer periphery of the gas diffusion electrode is discharged to the cathode current collecting frame. In this method, by assembling and tightening the electrolytic cell, the contact surface between the outer peripheral portion of the gas diffusion electrode and the cathode current collecting frame is also tightened, so that the electrical contact resistance at that location is reduced. The discharge path is a gas diffusion electrode → a cathode current collection frame → a cathode chamber frame. For this reason, the contact surface of the gas diffusion electrode with the cathode current collecting frame must not be an electrical insulator.
【０００３】２．ガス拡散電極、メッシュ状シート、陰
極集電枠の一体化 陰極集電枠の上に、メッシュ状シート、シート状に加工
したガス拡散電極を順に置き、それらをプレス機にて高
温プレスし、ガス拡散電極触媒を焼結させると共にガス
拡散電極を陰極集電枠と一体化する方法である。排電経
路は、ガス拡散電極→メッシュ状シート→陰極集電枠→
陰極室枠となる。このため、ガス拡散電極のメッシュ状
シートとの接触面およびメッシュ状シートは、電気絶縁
体であってはならない。 ３．ガス拡散電極のメッシュ状シートへの押し付け 苛性室の圧力をガス室（メッシュ状シートの網目空間が
いわゆるガス室）の圧力より大きくすることにより、ガ
ス拡散電極をメッシュ状シートに押し付け、ガス拡散電
極とメッシュ状シートの接触により排電する方法であ
る。排電経路は、ガス拡散電極→メッシュ状シート→陰
極集電枠→陰極室枠となる。このため、ガス拡散電極の
メッシュ状シートとの接触面およびメッシュ状シート
は、電気絶縁体であってはならない。[0003] 2. Integration of gas diffusion electrode, mesh sheet, and cathode current collector frame On the cathode current collector frame, put a mesh sheet, a gas diffusion electrode processed into a sheet shape in order, and press them at a high temperature with a press machine. This is a method in which the diffusion electrode catalyst is sintered and the gas diffusion electrode is integrated with the cathode current collecting frame. Discharge path is gas diffusion electrode → mesh sheet → cathode current collector frame →
It becomes the cathode compartment frame. For this reason, the contact surface of the gas diffusion electrode with the mesh sheet and the mesh sheet must not be an electrical insulator. 3. Pressing the gas diffusion electrode against the mesh sheet The gas diffusion electrode is pressed against the mesh sheet by increasing the pressure of the caustic chamber to the pressure of the gas chamber (the mesh space of the mesh sheet is a so-called gas chamber). This is a method of discharging electricity by contact between the sheet and the mesh sheet. The discharge path is gas diffusion electrode → mesh sheet → cathode current collecting frame → cathode chamber frame. For this reason, the contact surface of the gas diffusion electrode with the mesh sheet and the mesh sheet must not be an electrical insulator.
【０００４】４．ガス拡散電極のクサビ式固定 陰極集電枠の所定の位置に予め溝を設け、その溝にガス
拡散電極の外周部に露出させた導電体を入れ、更にその
溝にクサビを差し込むことによりガス拡散電極を固定す
る方法。排電経路は、ガス拡散電極→ガス拡散電極の導
電体→陰極集電枠→陰極室枠となる。[0004] 4. Wedge fixing of gas diffusion electrode A groove is provided in a predetermined position of the cathode current collecting frame, a conductor exposed on the outer peripheral portion of the gas diffusion electrode is put in the groove, and gas diffusion is performed by inserting a wedge into the groove. How to fix the electrodes. The discharge path is as follows: gas diffusion electrode → conductor of gas diffusion electrode → cathode current collector frame → cathode chamber frame.
【０００５】[0005]
【発明が解決しょうとする課題】しかしながら、このよ
うな従来のガス拡散電極の取付け、排電方法にあって
は、その作用機能に起因する、下記の問題点があった。 １．ガス拡散電極の外周部からの排電 小型の電解槽においては、反応面積に対し適当な導電接
触面積を確保できるため、接触電流密度を小さくでき、
電気接触抵抗を小さくできるが、反応面積が約３ｍ2 の
実機電解槽においては、反応面積に対し適当な導電接触
面積を確保できないため、接触電流密度が大きくなり、
電気接触抵抗が大きくなる。更に大型電解槽において
は、少なくとも反応面の一辺の長さが１ｍ以上になり、
ガス拡散電極の中の導電体の構造体抵抗は大きくなる。
以上の事実より運転経済性に劣る。また、約３ｍ2 とい
う大きいサイズのガス拡散電極シートを製作する必要が
あり、取扱いが困難である。However, such a conventional method of attaching and discharging a gas diffusion electrode has the following problems due to its function. 1. Discharge from the outer periphery of the gas diffusion electrode In a small electrolytic cell, an appropriate conductive contact area can be secured with respect to the reaction area.
Although the electrical contact resistance can be reduced, the contact current density increases in the actual electrolytic cell with a reaction area of about 3 m 2 because an appropriate conductive contact area cannot be secured for the reaction area.
Electric contact resistance increases. Further, in a large electrolytic cell, at least one side of the reaction surface is 1 m or more,
The structure resistance of the conductor in the gas diffusion electrode increases.
From the above facts, driving economy is inferior. In addition, it is necessary to manufacture a gas diffusion electrode sheet having a large size of about 3 m 2, which is difficult to handle.
【０００６】２．ガス拡散電極、メッシュ状シート、陰
極集電枠の一体化 実機電解槽の反応面積は約３ｍ2 であり、ガス拡散電
極、メッシュ状シート、陰極集電枠を一体化するため
に、巨大なプレス機、金型、昇温装置が必要であり、経
済的でない。また、陰極集電枠を高温プレスすることに
より、陰極集電枠が熱変形しやすく、平面度の精度を確
保するのが極めて困難である。仮に精度良く一体化する
ことができたとしても、反応面積が３ｍ2 もある一体化
した陰極集電枠は強度的に弱く、俗にいうぺらんぺらん
の状態であるため、プレス工場から電解槽組立て場所に
搬送することも極めて困難である。このことは、上記
「ガス拡散電極の外周部からの排電」の場合にも共通す
る問題である。更にガス拡散電極を更新する場合、陰極
集電枠からガス拡散電極を取り除くことは困難であり、
従って更新時には陰極集電枠およびメッシュ状シートも
更新する必要があり、経済的ではない。[0006] 2. Integration of gas diffusion electrode, mesh sheet and cathode current collector frame The reaction area of the actual electrolytic cell is about 3 m 2 , and a huge press is required to integrate the gas diffusion electrode, mesh sheet and cathode current collector frame. It requires a machine, a mold, and a heating device, and is not economical. Further, when the cathode current collecting frame is pressed at a high temperature, the cathode current collecting frame is easily deformed by heat, and it is extremely difficult to secure the accuracy of flatness. Even if it can be integrated with high accuracy, the integrated cathode current collector frame with a reaction area of 3 m 2 is weak in strength and is in a so-called flat state, so it is necessary to assemble an electrolytic cell from a press factory. It is also very difficult to transport to a place. This is a common problem also in the case of “discharge from the outer peripheral portion of the gas diffusion electrode”. Further, when updating the gas diffusion electrode, it is difficult to remove the gas diffusion electrode from the cathode current collector frame,
Therefore, at the time of renewal, the cathode current collecting frame and the mesh sheet also need to be renewed, which is not economical.
【０００７】３．ガス拡散電極のメッシュ状シートへの
押し付け 実機電解槽の気密圧力は０．２ｋｇ／ｃｍ2 であること
から、苛性室とガス室の最大圧力差も０．２ｋｇ／ｃｍ
2 となるため、ガス拡散電極とメッシュ状シートの接触
面圧を０．２ｋｇ／ｃｍ2 以上に大きくすることができ
ない。この程度の接触面圧では、ガス拡散電極とメッシ
ュ状シートの電気接触抵抗が大きくなる。また、実機電
解槽の高さは約１．２ｍであり、実際の苛性室の圧力は
上部と下部では約０．１６ｋｇ／ｃｍ2 の差があり、従
って電解槽上部のガス拡散電極とメッシュ状シートの接
触面圧は０．０４ｋｇ／ｃｍ2 以下となり、更にガス拡
散電極とメッシュ状シートの電気接触抵抗が大きくな
る。以上の事実より、反応面の電流密度を均一にするの
は困難であり、また、接触部の電気抵抗が大きく経済的
ではない。その上、約３ｍ2 という大きいサイズのガス
拡散電極シートを製作する必要があり、取扱いが困難で
ある。[0007] 3. Pressing the gas diffusion electrode against the mesh sheet Since the airtight pressure of the actual electrolytic cell is 0.2 kg / cm 2 , the maximum pressure difference between the caustic chamber and the gas chamber is also 0.2 kg / cm.
2, and therefore, it is impossible to increase the contact surface pressure of the gas diffusion electrode and the mesh sheet to 0.2 kg / cm 2 or more. With such a contact surface pressure, the electric contact resistance between the gas diffusion electrode and the mesh sheet increases. In addition, the height of the actual electrolytic cell is about 1.2 m, and the actual pressure of the caustic chamber has a difference of about 0.16 kg / cm 2 between the upper part and the lower part. The contact surface pressure of the sheet becomes 0.04 kg / cm 2 or less, and the electric contact resistance between the gas diffusion electrode and the mesh sheet further increases. From the above facts, it is difficult to make the current density on the reaction surface uniform and the electric resistance of the contact portion is large, which is not economical. In addition, it is necessary to manufacture a gas diffusion electrode sheet having a large size of about 3 m 2 , which is difficult to handle.
【０００８】４．ガス拡散電極のクサビ式固定 ガス拡散電極から陰極集電枠への排電は、ガス拡散電極
の外周部に露出させた導電体からの接触排電であり、微
小ながらも電気接触抵抗がある。また長期連続運転した
場合、電気接触抵抗が上昇する懸念がある。陰極集電枠
の製作面からも、陰極集電枠の所定の位置に予め溝を設
ける必要があり、溝が無い場合と比較し経済的ではな
い。[0008] 4. The wedge-type fixing of the gas diffusion electrode The discharge from the gas diffusion electrode to the cathode current collecting frame is a contact discharge from the conductor exposed on the outer peripheral portion of the gas diffusion electrode, and has a small but electrical contact resistance. In addition, when operated for a long period of time, there is a concern that the electric contact resistance increases. From the viewpoint of manufacturing the cathode current collecting frame, it is necessary to provide a groove in a predetermined position of the cathode current collecting frame in advance, which is not economical as compared with a case where there is no groove.
【０００９】本発明は、このような従来の問題点に鑑み
てなされたものであり、下記の７要件を満足させること
のできるガス拡散電極の溶接固定および排電方法を提供
することを課題とするものである。 １．ガス拡散電極と陰極集電枠の接続部の電気抵抗を小
さくする（接触排電するよりも固定的な接続である方が
電気抵抗は小さくなる。また電気抵抗の経時的増加がな
いものであること）。 ２．メッシュ状シートの接触面が電気絶縁体であるガス
拡散電極の使用を可能にする。 ３．電気絶縁体であるメッシュ状シートの使用を可能に
する。 ４．陰極集電枠へのガス拡散電極の取付けを容易にす
る。 ５．ガス拡散電極の単体のサイズを小さくし、製作およ
び取扱いを容易にする。 ６．ガス拡散電極の単体のサイズを小さくし、ガス拡散
電極自身の構造体抵抗を低減する。 ７．ガス拡散電極更新時に、ガス拡散電極のみを更新で
きるようにする。The present invention has been made in view of such conventional problems, and has as its object to provide a welding and fixing method of a gas diffusion electrode and a method of discharging electricity which can satisfy the following seven requirements. Is what you do. 1. Reduce the electrical resistance at the connection between the gas diffusion electrode and the cathode current collecting frame (the electrical resistance is smaller with a fixed connection than with the contact discharge, and the electrical resistance does not increase over time). thing). 2. This allows the use of gas diffusion electrodes where the contact surface of the mesh sheet is an electrical insulator. 3. Enables the use of mesh sheets that are electrical insulators. 4. The gas diffusion electrode can be easily attached to the cathode current collecting frame. 5. The size of a single gas diffusion electrode is reduced to facilitate manufacture and handling. 6. The size of a single gas diffusion electrode is reduced, and the structural resistance of the gas diffusion electrode itself is reduced. 7. When the gas diffusion electrode is updated, only the gas diffusion electrode can be updated.
【００１０】[0010]
【課題を解決するための手段】本発明者等は、前記課題
を解決すべく鋭意研究した結果、金属メッシュ加工材ま
たはスポンジ状加工材からなる導電体を触媒層で挟み込
むかまたはその上に触媒層を取り付けて構成したガス拡
散電極の外周部からだけ前記導電性の優れた金属導電体
を露出させ、この金属導電体の露出部をガス拡散電極か
ら陰極室枠への排電媒体の役目を果たす陰極集電枠に、
スポット溶接やレーザー溶接等の溶接によって固定する
ことにより上記の課題を解決できることを見出して本発
明を完成するに至った。すなわち、本発明は、次の構成
からなるものである。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a conductor made of a metal mesh processed material or a sponge-shaped processed material is sandwiched by a catalyst layer or a catalyst is placed thereon. The metal conductor having excellent conductivity is exposed only from the outer peripheral portion of the gas diffusion electrode formed by attaching the layer, and the exposed portion of the metal conductor serves as a discharge medium from the gas diffusion electrode to the cathode chamber frame. In the cathode current collector frame that plays,
The inventors have found that the above problem can be solved by fixing by spot welding, laser welding or the like, and have completed the present invention. That is, the present invention has the following configuration.
【００１１】（１）導電性の優れた金属メッシュ加工材
またはスポンジ状加工材からなる導電体を、触媒層で挟
み込みまたはその上に触媒層を取付けて構成したガス拡
散電極の外周部のみ前記導電体を露出させ、この露出し
た部分を陰極室枠への導電体として作用する陰極集電枠
に、溶接によって固定することにより、ガス拡散電極と
陰極室枠を電気的に接続することを特徴とするガス拡散
電極の溶接固定および排電方法。 （２）ガス拡散電極を溶接固定することにより、ガス拡
散電極に酸素を均等に供給するためのガス室形成用メッ
シュ状シートを固定する前記（１）記載のガス拡散電極
の溶接固定および排電方法。 （３）ガス拡散電極の外周部に露出させた前記導電体を
陰極集電枠に溶接によって固定する際に、前記導電体の
上に導電性の優れた金属製当て材料を載置し、溶接時の
前記導電体の損傷を防止する前記（１）記載のガス拡散
電極の溶接固定および排電方法。(1) A conductor made of a metal mesh working material or a sponge-like working material having excellent conductivity is sandwiched by a catalyst layer or a catalyst layer is mounted on the catalyst layer. The gas diffusion electrode and the cathode compartment frame are electrically connected by exposing the body and fixing the exposed portion to a cathode current collector frame acting as a conductor to the cathode compartment frame by welding. Fixing method and discharging method for gas diffusion electrode. (2) Fixing the gas diffusion electrode by welding and fixing the gas diffusion electrode according to (1), wherein the mesh-shaped sheet for forming a gas chamber for uniformly supplying oxygen to the gas diffusion electrode is fixed by welding. Method. (3) When the conductor exposed at the outer peripheral portion of the gas diffusion electrode is fixed to the cathode current collecting frame by welding, a highly conductive metal contact material is placed on the conductor and welding is performed. The method for fixing and discharging a gas diffusion electrode according to the above (1), wherein the conductor is prevented from being damaged at the time.
【００１２】（４）ガス拡散電極の外周部に露出させた
前記導電体の溶接箇所であるガス拡散電極間の間隙への
苛性ソーダの進入防止のために、前記間隙をシール剤に
よってシールする前記（１）記載のガス拡散電極の溶接
固定および排電方法。 （５）前記（３）記載の金属製当て材料を使用すること
によりシール剤の使用量を減少させる前記（４）記載の
ガス拡散電極の溶接固定および排電方法。 （６）前記ガス拡散電極の横方向の寸法が、３００〜４
００ｍｍである前記（１）〜（５）のいずれか１項に記
載のガス拡散電極の溶接固定および排電方法。 （７）ガス拡散電極を更新する際に、ガス拡散電極の外
周部に露出させた前記導電体を切断し、陰極集電枠から
ガス拡散電極だけを取り除き、再び新ガス拡散電極を前
記陰極集電枠に溶接によって固定する前記（１）記載の
ガス拡散電極の溶接固定および排電方法。(4) The gap is sealed with a sealant in order to prevent caustic soda from entering into the gap between the gas diffusion electrodes, which is the welded portion of the conductor exposed at the outer periphery of the gas diffusion electrode. 1) A method for welding and discharging a gas diffusion electrode according to the above 1). (5) The method for welding and fixing a gas diffusion electrode according to the above (4), wherein the amount of the sealant used is reduced by using the metal patch material according to the above (3). (6) The gas diffusion electrode has a lateral dimension of 300 to 4
The method according to any one of (1) to (5), wherein the gas diffusion electrode has a diameter of 00 mm. (7) When renewing the gas diffusion electrode, the conductor exposed on the outer peripheral portion of the gas diffusion electrode is cut, only the gas diffusion electrode is removed from the cathode current collecting frame, and the new gas diffusion electrode is again replaced with the cathode current collector. The method according to (1), wherein the gas diffusion electrode is fixed to the electric frame by welding.
【００１３】[0013]
【発明の実施の形態】本発明に使用する導電体用の金属
メッシュ状加工材またはスポンジ状加工材に加工する耐
アルカリ性で導電性に優れた金属としては、白金、金、
銀、ニッケルなどが挙げられるが、経済性の点から銀、
ニッケルが好ましく、導電性が優れている点で銀が最も
好ましい。BEST MODE FOR CARRYING OUT THE INVENTION Platinum, gold, and metal which are processed into a metal mesh-like processed material or a sponge-shaped processed material for an electric conductor used in the present invention are excellent in alkali resistance and excellent conductivity.
Silver, nickel, etc. are listed, but silver,
Nickel is preferred, and silver is most preferred because of its excellent conductivity.
【００１４】本発明において、陰極集電枠にガス拡散電
極の外周部に露出させた導電体を固定するための溶接手
段としてはスポット溶接、レーザー溶接等が挙げられ
る。ガス拡散電極から陰極集電枠への排電は、この溶接
で固定した箇所より行う。なお、溶接ラインがガス拡散
電極に供給されるガスの流れと直交した場合、ガス室内
のガスの流れを塞ぐことになるため、溶接ラインはガス
の流れと直交しないようにする。通常ガス室（メッシュ
状シートの隙間）内にガスを上から下へ流すため、溶接
ラインは鉛直方向となる。In the present invention, spot welding, laser welding and the like are mentioned as welding means for fixing the conductor exposed on the outer periphery of the gas diffusion electrode to the cathode current collecting frame. The discharge of electricity from the gas diffusion electrode to the cathode current collecting frame is performed from the place fixed by this welding. When the welding line is orthogonal to the flow of the gas supplied to the gas diffusion electrode, the gas flow in the gas chamber is blocked, so that the welding line is not orthogonal to the gas flow. Normally, the gas flows into the gas chamber (the gap between the mesh sheets) from the top to the bottom, so that the welding line is in the vertical direction.
【００１５】本発明においては、ガス拡散電極を溶接固
定することにより、ガス拡散電極の内側でガス室内にあ
るメッシュ状シートを固定化することができる。メッシ
ュ状シートが金属の場合には、メッシュ状シートを陰極
集電枠にスポット溶接または、レーザー溶接等の溶接で
固定することは可能であり、この方法は大きな意味を持
たないが、メッシュ状シートが樹脂製の場合、溶接によ
る固定は困難であり、またメッシュ状シートが軽量なた
め、このガス拡散電極の溶接固定の手段がメッシュ状シ
ートを安定するために有効となる。本発明においては、
ガス拡散電極の外周部に露出させた導電体を、陰極集電
枠に溶接によって固定するとき、溶接時の導電体の損傷
を防止するために、導電体の上に銀またはニッケル製の
ような金属製の丸棒や薄板等の当て材を置くことが好ま
しい。In the present invention, the mesh sheet in the gas chamber inside the gas diffusion electrode can be fixed by welding and fixing the gas diffusion electrode. When the mesh sheet is metal, it is possible to fix the mesh sheet to the cathode current collecting frame by welding such as spot welding or laser welding, and this method has no significant meaning. When is made of resin, fixing by welding is difficult and the weight of the mesh sheet is light. Therefore, the means for welding and fixing the gas diffusion electrode is effective to stabilize the mesh sheet. In the present invention,
When the conductor exposed on the outer periphery of the gas diffusion electrode is fixed to the cathode current collecting frame by welding, to prevent damage to the conductor during welding, a material such as silver or nickel is formed on the conductor. It is preferable to place a patch such as a metal round bar or a thin plate.
【００１６】本発明において、苛性ソーダ液の進入防止
のために導電体の溶接箇所、すなわち、隣接するガス拡
散電極同志の間隙をシールするためのシーリング材とし
ては、耐アルカリ性のシーリング材であれば特に制限さ
れることなく使用でき、例えば、合成ゴム、合成樹脂、
特に変成シリコーン系、チオコール系などの高性能シー
リング材が好ましく使用できる。しかし、ガス拡散電極
用触媒樹脂も好ましく使用できる。ガス拡散電極の縦方
向寸法は、電解槽の高さと同じでよいが、横方向寸法
は、陰極室枠導電体のピッチ、ガス拡散電極の導電体の
構造体抵抗、ガス拡散電極の製作および取扱いなどを考
慮すると４００〜３００ｍｍの範囲が好ましい。このた
め、電解槽の陰極は、このような幅の狭いガス拡散電極
の単体（単位体）を複数つなぎ合わせることにより、幅
の広いものを容易に構成することができる。また、この
ガス拡散電極は、電極更新時には、ガス拡散電極の外周
部に露出させた導電体を切断して取り除くことにより、
ガス拡散電極だけを更新することができるので、陰極室
枠全体を取りはづす必要がない。再び新ガス拡散電極を
前記陰極集電枠に溶接によって固定することにより電極
を更新することができる。In the present invention, as a sealing material for sealing a welded portion of a conductor to prevent the intrusion of caustic soda liquid, that is, a gap between adjacent gas diffusion electrodes, any sealing material which is alkali-resistant can be used. Can be used without limitation, for example, synthetic rubber, synthetic resin,
In particular, high-performance sealing materials such as denatured silicones and thiochols can be preferably used. However, a catalyst resin for a gas diffusion electrode can also be preferably used. The vertical dimension of the gas diffusion electrode may be the same as the height of the electrolytic cell, but the horizontal dimension is the pitch of the cathode chamber frame conductor, the structure resistance of the gas diffusion electrode conductor, the production and handling of the gas diffusion electrode. In consideration of the above, the range of 400 to 300 mm is preferable. For this reason, the cathode of the electrolytic cell can be easily configured to have a wide width by connecting a plurality of such narrow gas diffusion electrodes (units). Also, this gas diffusion electrode, when renewing the electrode, by cutting and removing the conductor exposed on the outer peripheral portion of the gas diffusion electrode,
Since only the gas diffusion electrode can be renewed, there is no need to remove the entire cathode chamber frame. The electrode can be renewed by fixing the new gas diffusion electrode to the cathode current collecting frame again by welding.
【００１７】[0017]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。ただし、本発明は、これらの実施例のみに限定さ
れるものではない。Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to only these examples.
【００１８】先ず、図１によって本発明のガス拡散電極
の取付け、排電方法の一例の全般的な説明を行う。図１
において、電解槽の陰極室枠導電体１には、ニッケル製
の陰極集電枠２が溶接３によって取り付けられている。
この場合の溶接はスポット溶接である。陰極集電枠２の
上には、酸素ガスを供給するためのスペースを確保する
ためにメッシュ状シート６を載置して、その網目空間に
よってガス拡散電極５との間にガス室７を形成してい
る。このメッシュ状シート６は金属製、樹脂製どちらで
もよい。そして、前記ガス拡散電極５は、前記のように
導電体９となる金属メッシュ加工材、例えば銀メッシュ
体を触媒層１０で挟み込むかまたは片面に取り付けた形
に製作されている（図４参照）。First, a general description of an example of a method of attaching and discharging a gas diffusion electrode according to the present invention will be given with reference to FIG. FIG.
, A cathode current collecting frame 2 made of nickel is attached to a cathode chamber frame conductor 1 of an electrolytic cell by welding 3.
The welding in this case is spot welding. A mesh sheet 6 is placed on the cathode current collecting frame 2 to secure a space for supplying oxygen gas, and a gas chamber 7 is formed between the cathode current collecting frame 2 and the gas diffusion electrode 5 by the mesh space. are doing. The mesh sheet 6 may be made of metal or resin. The gas diffusion electrode 5 is manufactured in such a manner that a metal mesh processing material serving as the conductor 9, for example, a silver mesh body is sandwiched by the catalyst layer 10 or attached to one surface as described above (see FIG. 4). .
【００１９】この導電体９は、ガス拡散電極５の触媒層
１０の外周部だけが露出するように構成されていて、そ
の露出部を触媒層１０の外周端部から折り曲げて、隣接
するガス拡散電極同志の間に所定の間隔毎に間隙８を形
成する（図３参照）。この間隙８には隣接するもう一方
のガス拡散電極５の導電体９の露出端部も折り曲げて挿
入、重積されて溶接によって固定されている（これらの
構造は後で図４〜図７により詳しく説明する）。更に、
この間隙８に挿入されて重ねられた導電体９同志の上に
は、耐アルカリ性のシール剤１２でシールされて、ガス
拡散電極５の溶接固定および排電を行うようにしてい
る。なお、１３はイオン交換膜、１４は陽極であり、１
５は苛性ソーダ液が流れる苛性室を示す。また、矢印は
電気の流れを示す。The conductor 9 is configured such that only the outer peripheral portion of the catalyst layer 10 of the gas diffusion electrode 5 is exposed, and the exposed portion is bent from the outer peripheral end of the catalyst layer 10 to form an adjacent gas diffusion electrode. The gaps 8 are formed at predetermined intervals between the electrodes (see FIG. 3). The exposed end of the conductor 9 of the other gas diffusion electrode 5 adjacent to the gap 8 is also bent, inserted, stacked, and fixed by welding (these structures will be described later with reference to FIGS. 4 to 7). explain in detail). Furthermore,
The conductors 9 inserted and stacked in the gap 8 are sealed with an alkali-resistant sealant 12 so that the gas diffusion electrode 5 is fixed by welding and discharged. In addition, 13 is an ion exchange membrane, 14 is an anode, and 1
Reference numeral 5 denotes a caustic chamber through which the caustic soda solution flows. Arrows indicate the flow of electricity.
【００２０】次に、図２〜図７を参照して、上記の本発
明のガス拡散電極の溶接固定および排電方法を工程順に
説明する。先ず、図２に示すように、電解槽の陰極室枠
導電体１に、ニッケル製の陰極集電枠２を溶接３（スポ
ット溶接）にて取付ける。構造体抵抗を小さくするた
め、別途導電リブ４を設け、そこを溶接３をする場合も
ある。Next, with reference to FIGS. 2 to 7, the method of welding and discharging the gas diffusion electrode of the present invention will be described in the order of steps. First, as shown in FIG. 2, a cathode current collecting frame 2 made of nickel is attached to a cathode chamber frame conductor 1 of an electrolytic cell by welding 3 (spot welding). In order to reduce the resistance of the structure, there is a case where a conductive rib 4 is separately provided and welded 3 there.
【００２１】次に、図３に示すように、ガス拡散電極５
にガスを供給するためのスペースを確保するため、陰極
集電枠２の上にメッシュ状シート６を置く。このメッシ
ュとしては、ニッケル製メッシュを更に波状に加工した
いわゆるコルゲートメッシュ等を使用する。メッシュ状
シート６によってできる空間がガス室（ガスが通過する
空間）７となる。なおこのメッシュ状シート６は金属製
でも良いが樹脂製でも構わない。また陰極集電枠２の上
の全面にメッシュ状シート６を置くのではなく、所定の
間隔毎に１〜５ｍｍ程度の間隙８を明ける。間隙８の箇
所は導電リブ４の上が好ましい。この間隙８の間隔はガ
ス拡散電極５中の導電体９の構造体抵抗およびガス拡散
電極５の取付けの作業性を考慮すると、３００〜４００
ｍｍ程度が好ましい。メッシュ状シート６は陰極集電枠
２の上に単に置くだけでも良いが、ずれ防止のため、レ
ーザー溶接、スポット溶接等の溶接、または接着剤等で
固定しても良い。Next, as shown in FIG.
The mesh sheet 6 is placed on the cathode current collecting frame 2 in order to secure a space for supplying gas to the cathode. As this mesh, a so-called corrugated mesh obtained by further processing a nickel mesh into a wave shape is used. The space formed by the mesh sheet 6 becomes a gas chamber (space through which gas passes) 7. The mesh sheet 6 may be made of metal or resin. Also, instead of placing the mesh sheet 6 on the entire surface of the cathode current collecting frame 2, a gap 8 of about 1 to 5 mm is made at predetermined intervals. The location of the gap 8 is preferably on the conductive rib 4. The interval of the gap 8 is 300 to 400 in consideration of the resistance of the structure of the conductor 9 in the gas diffusion electrode 5 and the workability of mounting the gas diffusion electrode 5.
mm is preferable. The mesh sheet 6 may be simply placed on the cathode current collecting frame 2, but may be fixed by welding such as laser welding, spot welding or the like, or with an adhesive or the like to prevent displacement.
【００２２】一方、図４に示すように、導電体９を触媒
層１０で挟み込むか、その上に触媒層１０を取付けた構
成のガス拡散電極５を製作する。なお、ガス拡散電極５
の周囲には、図４（ａ），（ｂ）のように導電体９のみ
を露出させる。なお、導電体は、銀メッシュ、ニッケル
メッシュ等の金属メッシュ加工材または発泡ニッケル等
の金属スポンジ加工材から構成される。続いて、図５に
示すように、前述のガス拡散電極５を陰極集電枠２およ
びガス室７用のメッシュ状シート６の上に置く。この時
ガス拡散電極５周囲の導電体９のみの部分が、前記のメ
ッシュ状シート６の間隙８（１〜５ｍｍ程度）に来るよ
うに置く。隣接するガス拡散電極５の導電体９のみの部
分を重ね合わせ、陰極集電枠２にスポット溶接またはレ
ーザー溶接等の溶接３によって取付ける。必ずしも重ね
る必要は無いが、溶接点数を少なくするには重ねた方が
良い。溶接３を行う時、非常に薄い導電体９（厚さ０．
２ｍｍ程度）が損傷するのを防ぐため、導電体９の上に
銀またはニッケル製等の薄板または丸棒等の当て材料１
１を置き、その上から溶接３しても良い。なお溶接３後
この当て材料１１は取り除く必要は無い（図６（ａ），
（ｂ）参照）。On the other hand, as shown in FIG. 4, the gas diffusion electrode 5 having the structure in which the conductor 9 is sandwiched between the catalyst layers 10 or the catalyst layer 10 is mounted thereon is manufactured. The gas diffusion electrode 5
4A, only the conductor 9 is exposed as shown in FIGS. The conductor is made of a metal mesh material such as silver mesh or nickel mesh or a metal sponge material such as foamed nickel. Subsequently, as shown in FIG. 5, the aforementioned gas diffusion electrode 5 is placed on the cathode current collecting frame 2 and the mesh sheet 6 for the gas chamber 7. At this time, the portion of only the conductor 9 around the gas diffusion electrode 5 is placed in the gap 8 (about 1 to 5 mm) of the mesh sheet 6. Adjacent portions of only the conductors 9 of the adjacent gas diffusion electrodes 5 are overlapped and attached to the cathode current collecting frame 2 by welding 3 such as spot welding or laser welding. It is not always necessary to overlap, but it is better to overlap to reduce the number of welding points. When welding 3 is performed, a very thin conductor 9 (thickness 0.
(About 2 mm) to prevent damage to the contact material 1 such as a thin plate made of silver or nickel or a round bar on the conductor 9.
1 and welding 3 may be performed from above. It is not necessary to remove the contact material 11 after welding 3 (FIG. 6 (a),
(B)).
【００２３】更に、図７に示すように、ガス拡散陰極の
間隙８は、耐アルカリ性のシール剤１１にてシールす
る。若くは、ガス拡散電極用触媒樹脂を乗せ、さらに加
熱、加圧し、ガス拡散電極５と同一化することが望まし
い。この場合当て材料１１があれば、シール剤１２の使
用量が少なくなり、またシール剤１２を固定することに
なるので、当て材料１０がある方が好ましい。このよう
にして、陽極１４からイオン交換膜１３を介して流れて
くる電気は、苛性室１５を流れている苛性ソーダを経て
ガス拡散電極５を通り、ガス拡散電極５の導電体９を流
れ、さらに、導電体９端部から陰極集電枠２に流れ、最
終的に、陰極室枠導電体１に流れることになる。Further, as shown in FIG. 7, the gap 8 between the gas diffusion cathodes is sealed with an alkali-resistant sealant 11. It is preferable that the catalyst resin for a gas diffusion electrode is placed thereon, and further heated and pressurized to make the same as the gas diffusion electrode 5. In this case, if the adhesive material 11 is used, the amount of the sealant 12 used is reduced, and the sealant 12 is fixed. Therefore, the presence of the adhesive material 10 is preferable. In this manner, the electricity flowing from the anode 14 through the ion exchange membrane 13 passes through the caustic soda flowing through the caustic chamber 15, passes through the gas diffusion electrode 5, flows through the conductor 9 of the gas diffusion electrode 5, and further flows. Flows from the end of the conductor 9 to the cathode current collecting frame 2, and finally to the cathode chamber frame conductor 1.
【００２４】試験例１ 下記の電解槽仕様および運転条件で試験を行った結果、
電解電圧は２．０１Ｖという著しく低い値ですんだ。 反応面寸法 ：Ｗ１００ｍｍ×Ｈ６００ｍｍ（反応面積：６ｄｍ2 ） 陽極 ：ペルメレック電極株式会社製ＤＳＥ 陰極 ：ガス拡散電極（Ｗ５０ｍｍ×Ｈ６００ｍｍのもの２枚を溶 接固定） メッシュ状シート ：ニッケル製コルゲートメッシュ（ニッケル製メッシュを 波状に加工したメッシュ） イオン交換膜 ：フレミオン８９３（旭硝子株式会社製） 電解電流密度 ：３ｋＡ／ｍ2 運転温度 ：９０℃ 苛性濃度 ：３２ｗｔ％ＮａＯＨ 塩水濃度 ：２１０ｇＮａＣｌ／リットルTest Example 1 A test was conducted under the following electrolytic cell specifications and operating conditions.
The electrolysis voltage is a remarkably low value of 2.01V. Reaction surface dimensions: W100 mm × H600 mm (reaction area: 6 dm 2 ) Anode: DSE manufactured by Permelec Electrode Co., Ltd. Cathode: Gas diffusion electrode (two pieces of W50 mm × H600 mm are welded and fixed) Mesh sheet: Nickel corrugated mesh (nickel) Ion exchange membrane: Flemion 893 (manufactured by Asahi Glass Co., Ltd.) Electrolytic current density: 3 kA / m 2 Operating temperature: 90 ° C. Caustic concentration: 32 wt% NaOH Salt water concentration: 210 g NaCl / liter
【００２５】[0025]
【発明の効果】本発明のガス拡散電極の溶接固定および
排電方法は、金属メッシュ加工材やスポンジ状加工材か
らなる導電体を触媒層で挟み込んだり、片面上に触媒層
を取付けて構成したガス拡散電極の外周部からだけ前記
導電体を露出させ、この露出した前記導電体を露出端で
折り曲げて、隣接するガス拡散電極同士の間に形成した
間隙で、隣接するもう一方のガス拡散電極の露出した前
記導電体の折り曲げ端部と重ね合わせて溶接することに
より、前記導電体を陰極集電枠の内壁に固定、接触させ
ているので、接触部の電気抵抗を低減し、電解電圧を著
しく低減できるだけでなく、電極更新時には、ガス拡散
電極の外周部に露出させた導電体を切断して取り除くこ
とにより、ガス拡散電極だけを更新できるため、従来の
ガス拡散電極の取付け、排電方法に比べて経済的にも極
めて優れたものとなる。The method of welding and discharging a gas diffusion electrode according to the present invention is constituted by sandwiching a conductor made of a metal mesh material or a sponge-like material with a catalyst layer or attaching a catalyst layer on one surface. The conductor is exposed only from the outer peripheral portion of the gas diffusion electrode, the exposed conductor is bent at the exposed end, and the other adjacent gas diffusion electrode is formed in a gap formed between adjacent gas diffusion electrodes. The conductor is fixed to and contacted with the inner wall of the cathode current collecting frame by overlapping and welding with the exposed bent end portion of the conductor, so that the electric resistance of the contact portion is reduced, and the electrolytic voltage is reduced. Not only can the gas diffusion electrode be significantly reduced, but when the electrode is renewed, only the gas diffusion electrode can be renewed by cutting and removing the conductor exposed on the outer periphery of the gas diffusion electrode. Only, it is those very highly economical compared to discharge electrostatic method.
【図１】本発明のガス拡散電極の溶接固定および排電方
法の一例を示す断面説明図である。FIG. 1 is an explanatory cross-sectional view showing one example of a method for welding and discharging a gas diffusion electrode of the present invention.
【図２】本発明のガス拡散電極の溶接固定および排電方
法の陰極集電枠と陰極室枠導電体のスポット溶接工程を
示す断面説明図である。FIG. 2 is an explanatory sectional view showing a spot welding step of a cathode current collector frame and a cathode chamber frame conductor in a method for welding and discharging a gas diffusion electrode according to the present invention;
【図３】陰極集電枠上にメッシュ状シートを載置してガ
ス室を形成する工程を示す断面説明図である。FIG. 3 is an explanatory sectional view showing a step of forming a gas chamber by placing a mesh sheet on a cathode current collecting frame.
【図４】本発明に係るガス拡散電極の構成を示す断面説
明図であり、（ａ）は導電体の片面に触媒層が取付けら
れている場合を、（ｂ）は導電体が触媒層に挟み込まれ
ている場合を示す。FIGS. 4A and 4B are cross-sectional explanatory views showing a configuration of a gas diffusion electrode according to the present invention, wherein FIG. 4A shows a case where a catalyst layer is attached to one surface of a conductor, and FIG. This shows a case in which it is sandwiched.
【図５】隣接するガス拡散電極外周の導電体露出端の折
り曲げ部を重ね合わせる工程を示す断面説明図である。FIG. 5 is an explanatory cross-sectional view showing a step of superimposing bent portions of exposed conductors on the outer periphery of adjacent gas diffusion electrodes.
【図６】図５の導電体露出端の重ね合わせ部の溶接工程
を示す要部拡大断面説明図で、（ａ）は当て材料を用い
ない場合、（ｂ）は当て材料を用いる場合を示す。FIGS. 6A and 6B are enlarged sectional explanatory views of a main part showing a welding process of a superposed portion of the exposed conductor end of FIG. 5; FIG. 6A shows a case where a contact material is not used, and FIG. .
【図７】図６（ａ）の溶接工程に次ぐシール形成工程の
一例を示す要部拡大断面説明図である。FIG. 7 is an enlarged sectional explanatory view of an essential part showing an example of a seal forming step following the welding step of FIG. 6 (a).
１ 陰極室枠導電体 ２ 陰極集電枠 ３ 溶接 ４ 導電リブ ５ ガス拡散電極 ６ メッシュ状シート ７ ガス室 ８ 間隙 ９ 導電体 １０ 触媒層 １１ 当て材料 １２ シール剤 １３ イオン交換膜 １４ 陽極 １５ 苛性室 DESCRIPTION OF SYMBOLS 1 Cathode chamber frame conductor 2 Cathode current collecting frame 3 Welding 4 Conductive rib 5 Gas diffusion electrode 6 Mesh sheet 7 Gas chamber 8 Gap 9 Conductor 10 Catalyst layer 11 Patch material 12 Sealant 13 Ion exchange membrane 14 Anode 15 Caustic chamber
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１１年１２月３日（１９９９．１２．
３）[Submission date] December 3, 1999 (1999.12.
3)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の名称[Correction target item name] Name of invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【発明の名称】 ガス拡散電極の排電方法Patent application title: Discharge method for gas diffusion electrode
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Correction target item name] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【特許請求の範囲】[Claims]
【手続補正３】[Procedure amendment 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００１[Correction target item name] 0001
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００１】[0001]
【発明の属する技術分野】本発明は、イオン交換膜食塩
電解の酸素陰極、亡硝電解の電極等に用いるガス拡散電
極の排電方法に関し、特にガス拡散電極から陰極室枠へ
の排電が容易になったガス拡散電極の排電方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for discharging a gas diffusion electrode used for an oxygen cathode for ion exchange membrane electrolysis, an electrode for nitrite electrolysis, etc., and more particularly to a method for discharging electricity from a gas diffusion electrode to a cathode chamber frame. The present invention relates to an easy method for discharging gas diffusion electrodes.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００９[Correction target item name] 0009
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００９】本発明は、このような従来の問題点に鑑み
てなされたものであり、下記の７要件を満足させること
のできるガス拡散電極の排電方法を提供することを課題
とするものである。 １．ガス拡散電極と陰極集電枠の接続部の電気抵抗を小
さくする（接触排電するよりも固定的な接続である方が
電気抵抗は小さくなる。また電気抵抗の経時的増加がな
いものであること）。 ２．メッシュ状シートの接触面が電気絶縁体であるガス
拡散電極の使用を可能にする。 ３．電気絶縁体であるメッシュ状シートの使用を可能に
する。 ４．陰極集電枠へのガス拡散電極の取付けを容易にす
る。 ５．ガス拡散電極の単体のサイズを小さくし、製作およ
び取扱いを容易にする。 ６．ガス拡散電極の単体のサイズを小さくし、ガス拡散
電極自身の構造体抵抗を低減する。 ７．ガス拡散電極更新時に、ガス拡散電極のみを更新で
きるようにする。The present invention has been made in view of such conventional problems, and has as its object to provide a method for discharging a gas diffusion electrode that can satisfy the following seven requirements. is there. 1. Reduce the electrical resistance at the connection between the gas diffusion electrode and the cathode current collecting frame (the electrical resistance is smaller with a fixed connection than with the contact discharge, and the electrical resistance does not increase over time). thing). 2. This allows the use of gas diffusion electrodes where the contact surface of the mesh sheet is an electrical insulator. 3. Enables the use of mesh sheets that are electrical insulators. 4. The gas diffusion electrode can be easily attached to the cathode current collecting frame. 5. The size of a single gas diffusion electrode is reduced to facilitate manufacture and handling. 6. The size of a single gas diffusion electrode is reduced, and the structural resistance of the gas diffusion electrode itself is reduced. 7. When the gas diffusion electrode is updated, only the gas diffusion electrode can be updated.
【手続補正５】[Procedure amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１１[Correction target item name] 0011
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００１１】（１）導電性の優れた金属メッシュ加工材
またはスポンジ状加工材からなる導電体を、触媒層で挟
み込みまたはその上に触媒層を取付けて構成したガス拡
散電極の外周部のみ前記導電体を露出させ、この露出し
た部分を陰極室枠への導電体として作用する陰極集電枠
に、溶接によって固定することにより、ガス拡散電極と
陰極室枠を電気的に接続することを特徴とするガス拡散
電極の排電方法。 （２）ガス拡散電極を溶接固定することにより、ガス拡
散電極に酸素を均等に供給するためのガス室形成用メッ
シュ状シートを固定する前記（１）記載のガス拡散電極
の排電方法。 （３）ガス拡散電極の外周部に露出させた前記導電体を
陰極集電枠に溶接によって固定する際に、前記導電体の
上に導電性の優れた金属製当て材料を載置し、溶接時の
前記導電体の損傷を防止する前記（１）記載のガス拡散
電極の排電方法。(1) A conductor made of a metal mesh working material or a sponge-like working material having excellent conductivity is sandwiched by a catalyst layer or a catalyst layer is mounted on the catalyst layer. The gas diffusion electrode and the cathode compartment frame are electrically connected by exposing the body and fixing the exposed portion to a cathode current collector frame acting as a conductor to the cathode compartment frame by welding. Method for discharging gas diffusion electrodes. (2) The gas diffusion electrode according to (1), wherein the gas diffusion electrode is fixed by welding to fix a mesh sheet for forming a gas chamber for uniformly supplying oxygen to the gas diffusion electrode.
Power discharge method. (3) When the conductor exposed at the outer peripheral portion of the gas diffusion electrode is fixed to the cathode current collecting frame by welding, a highly conductive metal contact material is placed on the conductor and welding is performed. The method for discharging a gas diffusion electrode according to the above (1), wherein the conductor is prevented from being damaged at the time.
【手続補正６】[Procedure amendment 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００１２】（４）ガス拡散電極の外周部に露出させた
前記導電体の溶接箇所であるガス拡散電極間の間隙への
苛性ソーダの進入防止のために、前記間隙をシール剤に
よってシールする前記（１）記載のガス拡散電極の排電
方法。 （５）前記（３）記載の金属製当て材料を使用すること
によりシール剤の使用量を減少させる前記（４）記載の
ガス拡散電極の排電方法。 （６）前記ガス拡散電極の横方向の寸法が、３００〜４
００ｍｍである前記（１）〜（５）のいずれか１項に記
載のガス拡散電極の排電方法。 （７）ガス拡散電極を更新する際に、ガス拡散電極の外
周部に露出させた前記導電体を切断し、陰極集電枠から
ガス拡散電極だけを取り除き、再び新ガス拡散電極を前
記陰極集電枠に溶接によって固定する前記（１）記載の
ガス拡散電極の排電方法。(4) The gap is sealed with a sealant in order to prevent caustic soda from entering into the gap between the gas diffusion electrodes, which is the welded portion of the conductor exposed at the outer periphery of the gas diffusion electrode. 1) A method for discharging a gas diffusion electrode according to 1). (5) The method for discharging a gas diffusion electrode according to (4), wherein the amount of the sealant used is reduced by using the metal patch material according to (3). (6) The gas diffusion electrode has a lateral dimension of 300 to 4
The method for discharging a gas diffusion electrode according to any one of the above (1) to (5), which is 00 mm. (7) When renewing the gas diffusion electrode, the conductor exposed on the outer peripheral portion of the gas diffusion electrode is cut, only the gas diffusion electrode is removed from the cathode current collecting frame, and the new gas diffusion electrode is again replaced with the cathode current collector. The method for discharging a gas diffusion electrode according to the above (1), wherein the gas diffusion electrode is fixed to the electric frame by welding.
【手続補正７】[Procedure amendment 7]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２０[Correction target item name] 0020
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００２０】次に、図２〜図７を参照して、上記の本発
明のガス拡散電極の排電方法を工程順に説明する。先
ず、図２に示すように、電解槽の陰極室枠導電体１に、
ニッケル製の陰極集電枠２を溶接３（スポット溶接）に
て取付ける。構造体抵抗を小さくするため、別途導電リ
ブ４を設け、そこを溶接３をする場合もある。Next, the method of discharging the gas diffusion electrode of the present invention will be described in the order of steps with reference to FIGS. First, as shown in FIG. 2, the cathode chamber frame conductor 1 of the electrolytic cell is
The cathode current collecting frame 2 made of nickel is attached by welding 3 (spot welding). In order to reduce the resistance of the structure, there is a case where a conductive rib 4 is separately provided and welded 3 there.
【手続補正８】[Procedure amendment 8]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２５[Correction target item name] 0025
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００２５】[0025]
【発明の効果】本発明のガス拡散電極の排電方法は、金
属メッシュ加工材やスポンジ状加工材からなる導電体を
触媒層で挟み込んだり、片面上に触媒層を取付けて構成
したガス拡散電極の外周部からだけ前記導電体を露出さ
せ、この露出した前記導電体を露出端で折り曲げて、隣
接するガス拡散電極同士の間に形成した間隙で、隣接す
るもう一方のガス拡散電極の露出した前記導電体の折り
曲げ端部と重ね合わせて溶接することにより、前記導電
体を陰極集電枠の内壁に固定、接触させているので、接
触部の電気抵抗を低減し、電解電圧を著しく低減できる
だけでなく、電極更新時には、ガス拡散電極の外周部に
露出させた導電体を切断して取り除くことにより、ガス
拡散電極だけを更新できるため、従来のガス拡散電極の
取付け、排電方法に比べて経済的にも極めて優れたもの
となる。The method for discharging a gas diffusion electrode according to the present invention is directed to a gas diffusion electrode comprising a conductor made of a metal mesh material or a sponge-like material sandwiched between catalyst layers or a catalyst layer attached to one surface. The conductor is exposed only from the outer periphery of the conductor, and the exposed conductor is bent at the exposed end, and the other adjacent gas diffusion electrode is exposed at a gap formed between adjacent gas diffusion electrodes. By overlapping and welding the bent end portion of the conductor, the conductor is fixed to and contacted with the inner wall of the cathode current collector frame, so that the electric resistance of the contact portion can be reduced and the electrolytic voltage can be significantly reduced. Instead, when renewing the electrodes, only the gas diffusion electrodes can be renewed by cutting and removing the conductor exposed on the outer periphery of the gas diffusion electrodes. Compared also to those excellent in economical.
【手続補正９】[Procedure amendment 9]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図１[Correction target item name] Fig. 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図１】本発明のガス拡散電極の排電方法の一例を示す
断面説明図である。FIG. 1 is an explanatory sectional view showing an example of a method for discharging a gas diffusion electrode according to the present invention.
【手続補正１０】[Procedure amendment 10]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図２[Correction target item name] Figure 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図２】本発明のガス拡散電極の排電方法の陰極集電枠
と陰極室枠導電体のスポット溶接工程を示す断面説明図
である。FIG. 2 is an explanatory sectional view showing a spot welding step of a cathode current collector frame and a cathode chamber frame conductor in a method for discharging a gas diffusion electrode according to the present invention.
フロントページの続き (71)出願人 000105040 クロリンエンジニアズ株式会社 東京都江東区深川２丁目６番11号 富岡橋 ビル (72)発明者 坂田 昭博 東京都港区西新橋一丁目14番１号 東亞合 成株式会社内 (72)発明者 斎木 幸治 大阪府大阪市北区中之島三丁目２番４号 鐘淵化学工業株式会社内 (72)発明者 相川 洋明 東京都千代田区霞が関三丁目２番５号 三 井化学株式会社内 (72)発明者 片山 真二 岡山県玉野市東高崎24丁目６号 クロリン エンジニアズ株式会社内 (72)発明者 山口 健三 東京都中央区築地５丁目６番４号 コンセ プト エンジニアズ株式会社内 Ｆターム(参考） 4K011 AA20 AA22 CA04 DA03 Continuation of front page (71) Applicant 000105040 Chlorine Engineers Co., Ltd. 2-6-111 Fukagawa, Koto-ku, Tokyo Tomiokabashi Building (72) Inventor Akihiro Sakata 1-14-1 Nishishinbashi, Minato-ku, Tokyo (72) Inventor Koji Saiki 3-4-2 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kanebuchi Chemical Industry Co., Ltd. (72) Inventor Hiroaki Aikawa 3-5-2 Kasumigaseki, Chiyoda-ku, Tokyo 3 (72) Inventor Shinji Katayama 24-6 Higashi-Takasaki, Tamano-shi, Okayama Prefecture Chlorine Engineers Inc. (72) Inventor Kenzo Yamaguchi 5-6-4 Tsukiji, Chuo-ku, Tokyo Concept Engineers F term (reference) 4K011 AA20 AA22 CA04 DA03
Claims (7)
はスポンジ状加工材からなる導電体を、触媒層で挟み込
みまたはその上に触媒層を取付けて構成したガス拡散電
極の外周部のみ前記導電体を露出させ、この露出した部
分を陰極室枠への導電体として作用する陰極集電枠に、
溶接によって固定することにより、ガス拡散電極と陰極
室枠を電気的に接続することを特徴とするガス拡散電極
の溶接固定および排電方法。1. A gas diffusion electrode comprising a conductor made of a metal mesh material or a sponge-like material having excellent conductivity sandwiched by a catalyst layer or having a catalyst layer mounted thereon. And expose the exposed portion to a cathode current collector frame acting as a conductor to the cathode chamber frame,
A method of welding and discharging a gas diffusion electrode, wherein the gas diffusion electrode and the cathode chamber frame are electrically connected by fixing by welding.
り、ガス拡散電極に酸素を均等に供給するためのガス室
形成用メッシュ状シートを固定する請求項１記載のガス
拡散電極の溶接固定および排電方法。2. The welding and fixing of a gas diffusion electrode according to claim 1, wherein the gas diffusion electrode is fixed by welding to fix a mesh sheet for forming a gas chamber for uniformly supplying oxygen to the gas diffusion electrode. Electric method.
導電体を陰極集電枠に溶接によって固定する際に、前記
導電体の上に導電性の優れた金属製当て材料を載置し、
溶接時の前記導電体の損傷を防止する請求項１記載のガ
ス拡散電極の溶接固定および排電方法。3. When the conductor exposed at the outer peripheral portion of the gas diffusion electrode is fixed to the cathode current collecting frame by welding, a highly conductive metal contact material is placed on the conductor. ,
The method according to claim 1, wherein the conductor is prevented from being damaged during welding.
導電体の溶接箇所であるガス拡散電極間の間隙への苛性
ソーダの進入防止のために、前記間隙をシール剤によっ
てシールする請求項１記載のガス拡散電極の溶接固定お
よび排電方法。4. The sealing device is characterized in that the gap is sealed with a sealant in order to prevent caustic soda from entering a gap between the gas diffusion electrodes, which is a welded portion of the conductor exposed at an outer peripheral portion of the gas diffusion electrode. A method for welding and discharging a gas diffusion electrode according to the above.
ることによりシール剤の使用量を減少させる請求項４記
載のガス拡散電極の溶接固定および排電方法。5. The method according to claim 4, wherein the amount of the sealant used is reduced by using the metal patch material according to claim 3.
００〜４００ｍｍである請求項１〜５のいずれか１項に
記載のガス拡散電極の溶接固定および排電方法。6. A gas diffusion electrode having a lateral dimension of 3
The welding fixing and discharging method of the gas diffusion electrode according to any one of claims 1 to 5, which is from 00 to 400 mm.
電極の外周部に露出させた前記導電体を切断し、陰極集
電枠からガス拡散電極だけを取り除き、再び新ガス拡散
電極を前記陰極集電枠に溶接によって固定する請求項１
記載のガス拡散電極の溶接固定および排電方法。7. When the gas diffusion electrode is renewed, the conductor exposed at the outer peripheral portion of the gas diffusion electrode is cut off, only the gas diffusion electrode is removed from the cathode current collecting frame, and the new gas diffusion electrode is replaced again. 2. The fixing device according to claim 1, wherein the fixing device is fixed to the cathode current collecting frame by welding.
A method for welding and discharging a gas diffusion electrode according to the above.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373787A JP3041785B1 (en) | 1998-12-28 | 1998-12-28 | Discharge method of gas diffusion electrode |
| US09/581,430 US6372102B1 (en) | 1998-10-13 | 1999-10-12 | Method for reducing charge in gas diffusing electrode and its charge reducing structure |
| PCT/JP1999/005620 WO2000022192A1 (en) | 1998-10-13 | 1999-10-12 | Method for reducing charge in gas diffusing electrode and its charge reducing structure |
| CNB99801821XA CN1163635C (en) | 1998-10-13 | 1999-10-12 | Method for reducing charge in gas diffusing electrode and its charge reducing structure |
| EP99970431A EP1041176A4 (en) | 1998-10-13 | 1999-10-12 | Method for reducing charge in gas diffusing electrode and its charge reducing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10373787A JP3041785B1 (en) | 1998-12-28 | 1998-12-28 | Discharge method of gas diffusion electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3041785B1 JP3041785B1 (en) | 2000-05-15 |
| JP2000199094A true JP2000199094A (en) | 2000-07-18 |
Family
ID=18502759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10373787A Expired - Fee Related JP3041785B1 (en) | 1998-10-13 | 1998-12-28 | Discharge method of gas diffusion electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3041785B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1471589A3 (en) * | 2003-03-31 | 2007-05-02 | CHLORINE ENGINEERS CORP., Ltd. | Gas diffusion electrode assembly, bonding method for gas diffusion electrodes, and electrolyzer comprising gas diffusion electrodes |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005034120B4 (en) * | 2005-07-21 | 2013-02-07 | Siltronic Ag | Method for producing a semiconductor wafer |
-
1998
- 1998-12-28 JP JP10373787A patent/JP3041785B1/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1471589A3 (en) * | 2003-03-31 | 2007-05-02 | CHLORINE ENGINEERS CORP., Ltd. | Gas diffusion electrode assembly, bonding method for gas diffusion electrodes, and electrolyzer comprising gas diffusion electrodes |
| US7404878B2 (en) | 2003-03-31 | 2008-07-29 | Chlorine Engineers Corp., Ltd. | Gas diffusion electrode assembly, bonding method for gas diffusion electrodes, and electrolyzer comprising gas diffusion electrodes |
| US7569083B2 (en) | 2003-03-31 | 2009-08-04 | Chlorine Engineers Corp. Ltd. | Gas diffusion electrode assembly, bonding method for gas diffusion electrodes, and electrolyzer comprising gas diffusion electrodes |
| EP2237349A1 (en) | 2003-03-31 | 2010-10-06 | Chlorine Engineers Corp., Ltd. | Bonding method for a gas diffusion electrode assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3041785B1 (en) | 2000-05-15 |
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