JPH0631452B2 - How to attach the ion exchange membrane - Google Patents
How to attach the ion exchange membraneInfo
- Publication number
- JPH0631452B2 JPH0631452B2 JP61076741A JP7674186A JPH0631452B2 JP H0631452 B2 JPH0631452 B2 JP H0631452B2 JP 61076741 A JP61076741 A JP 61076741A JP 7674186 A JP7674186 A JP 7674186A JP H0631452 B2 JPH0631452 B2 JP H0631452B2
- Authority
- JP
- Japan
- Prior art keywords
- exchange membrane
- ion exchange
- ion
- electrolytic cell
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、アルカリ金属塩水溶液の電解に用いるフィル
タープレス型電解槽にイオン交換膜を装着する方法に関
する。詳しくは、予め寸法安定化処理したイオン交換膜
の特定部分のイオン交換基を除去して電解槽に装着する
方法を提供するものである。TECHNICAL FIELD The present invention relates to a method for mounting an ion exchange membrane in a filter press type electrolytic cell used for electrolysis of an alkali metal salt aqueous solution. More specifically, the present invention provides a method of removing an ion-exchange group from a specific portion of an ion-exchange membrane which has been subjected to a dimension stabilization treatment in advance and mounting it on an electrolytic cell.
（従来技術およびその問題点） フィルタープレス型電解槽は、内部に陽極を収納した陽
極室枠と内部に陰極を収納した陽極室枠（これら両者を
総称して電極室枠とも称する）とをイオン交換膜を介し
て相対させた基本構造（ユニットセルと称する）よりな
る。この場合、１つの陽極室と１つの陰極室とが隔壁を
介して接合し、各室内にある陽極および陰極の間が電気
的に接続された複極式構造、及び陽極室と陰極室とが夫
々独立に形成される単極式構造がある。いずれの構造に
あたっても、これらの電極室は多数重合して締付けら
れ、一個のフィルタープレス型電解槽として形成され
る。(Prior Art and Problems Thereof) A filter press type electrolytic cell comprises an anode chamber frame having an anode housed therein and an anode chamber frame having a cathode housed therein (both of which are also collectively referred to as an electrode chamber frame). It has a basic structure (referred to as a unit cell) opposed to each other through an exchange membrane. In this case, one anode chamber and one cathode chamber are joined via a partition wall, and a bipolar structure in which the anode and the cathode in each chamber are electrically connected, and the anode chamber and the cathode chamber are There is a monopolar structure that is formed independently of each other. In any structure, a large number of these electrode chambers are polymerized and tightened to form one filter press type electrolytic cell.
かかるフィルタープレス型電解槽においては、外部に電
解液および気体が漏れるのを防止するために、電極室枠
である陽極室枠と陰極室枠との間にそれぞれパッキンを
挿着してイオン交換膜を挾み締め付けている。In such a filter press type electrolytic cell, in order to prevent electrolyte and gas from leaking to the outside, a packing is inserted between the anode chamber frame and the cathode chamber frame, which are the electrode chamber frames, to form an ion exchange membrane. It is pinched and tightened.
ところで、上記したようなフィルタープレス型電解槽に
おいては、構造上で陽極側パッキンとイオン交換膜との
隙間に電解時に低濃度のアルカリ金属塩水溶液の溜り部
分を生ずる問題がある。特に工業的な大型のフィルター
プレス型電解槽は、重量も大きくなるため、一般には電
極室枠を架台上に乗せて該枠間にイオン交換膜およびパ
ッキンを一枚づつ順次に挿入し、入手によりこれを保持
しつつ、次の電極室枠を押しつけ挾み込む作業により組
立てられる。このような作業による場合、挾み込む時に
電極室枠間で締付枠部に若干のズレを生じることが避け
られなかったり、また締付時にパッキンを電極室枠の周
縁部に一致するようにはり合わせ挿着しようとしても、
パッキン間でズレが生ずることも避けられなかった。こ
のような陽極室枠のパッキンが陰極室枠のパッキンより
もずれて電極室内に入っている状態の電解槽をアルカリ
金属塩水溶液の電解に供した場合には、締め付けが不十
分な陽極側のパッキン部において、該パッキンとイオン
交換膜とに隙間を生じる塩水が存在することになる。し
たがって、実際に電解を実施した場合、電流は上記した
パッキンとイオン交換膜との隙間部分にもイオン交換膜
を介して流れるが、それに伴い該隙間部分における塩水
の供給が不足をきたす。そのため、上記の隙間部に対応
するイオン交換膜の陽極側面において塩濃度が低下する
ことにより、陰極側面に多量の水ぶくれが生じ、イオン
交換膜の破損を生ずるばかりか、その破損した膜部分か
ら陰極室中へ陽極液が混入し、生成した苛性アルカリ中
へ塩類が混入したり、逆に陽極室へ陰極液が混入して電
流効率の低下を招くなどの問題を起こす。このような状
態が生じてイオン交換膜が破損した場合、該イオン交換
膜の交換を余儀なくされ、アルカリ金属塩水溶液のフィ
ルタープレス型電解槽を長期間にわたり連続運転するこ
とが困難となる。By the way, in the filter press type electrolytic cell as described above, there is a problem in structure that a portion of a low-concentration aqueous solution of alkali metal salt is accumulated during electrolysis in a gap between the anode side packing and the ion exchange membrane. In particular, a large industrial filter press type electrolytic cell also has a large weight, so generally, an electrode chamber frame is placed on a frame, and ion exchange membranes and packings are sequentially inserted between the frames, and the While holding this, the next electrode chamber frame is pressed and sandwiched to assemble. When performing such work, it is inevitable that the clamping frame part will slightly shift between the electrode chamber frames when it is pinched, and the packing should be aligned with the peripheral edge part of the electrode chamber frame when tightening. Even if you try to fit it together,
It was unavoidable that there was a gap between the packings. When an electrolytic cell in which the packing of the anode chamber frame is displaced from the packing of the cathode chamber frame and is in the electrode chamber is subjected to the electrolysis of the alkali metal salt aqueous solution, the tightening of the anode side is insufficient. In the packing part, there is salt water that creates a gap between the packing and the ion exchange membrane. Therefore, when electrolysis is actually carried out, the electric current also flows through the gap portion between the packing and the ion exchange membrane through the ion exchange membrane, but with this, the supply of salt water in the gap portion becomes insufficient. Therefore, a large amount of blistering occurs on the cathode side surface due to a decrease in the salt concentration on the anode side surface of the ion exchange membrane corresponding to the above-mentioned gap portion, which not only causes damage to the ion exchange membrane, but also causes damage to the cathode from the damaged membrane portion. This causes problems such that the anolyte mixes into the chamber, salts are mixed into the generated caustic, and conversely the catholyte mixes into the anode chamber, resulting in a decrease in current efficiency. When such a state occurs and the ion exchange membrane is damaged, the ion exchange membrane is forced to be exchanged, and it becomes difficult to continuously operate the filter press type electrolytic cell of the alkali metal salt aqueous solution for a long period of time.
上記の問題点を解決するために、例えばフィルタープレ
ス型電解槽を締め付けた際に陰極室側パッキンの内縁が
陽極室側パッキンより内側に存在する如く構成すること
（実開昭59-28558号）、陰極室枠側パッキンとイオン交
換膜又は陰極室枠の間にテフロン等の絶縁性フィルムを
該フィルムの内縁が陽極室側パッキンより内側に存在す
るごとく介在させること、或いは陰極室枠の圧接面の内
縁が陽極室枠の内縁よりも内側に存在するごとく構成す
ること（実開昭59-76565号）が提案されている。しかし
ながら、前２者の構成では、上記問題をある程度まで解
決することができるが、陰極室側のパッキン及び絶縁性
フィルムはイオン交換膜と該パッキン又は絶縁性フィル
ムの密着（圧接）が不十分である。他方、後者の構成で
は、イオン交換膜に接するパッキンおよび陽極の面が同
一線上に位置する場合に有効であるが、一般に陽極がチ
タン等の材料ではそのような形状に加工することが難し
いために、パッキンと陽極との面が同一線上に位置でき
ない場合も多く、特にパッキン面の方が凸状になる場合
にはイオン交換膜とパッキンとが十分に密着されない。In order to solve the above problems, for example, when the filter press type electrolytic cell is tightened, the inner edge of the cathode chamber side packing should be located inside the anode chamber side packing (Actual No. 59-28558). The cathode chamber frame side packing and the ion exchange membrane or the cathode chamber frame, an insulating film such as Teflon is interposed so that the inner edge of the film is inside the anode chamber side packing, or the pressure contact surface of the cathode chamber frame. It has been proposed that the inner edge of the anode should be located inside the inner edge of the anode chamber frame (Shokai 59-76565). However, the former two configurations can solve the above problems to some extent, but the packing and the insulating film on the cathode chamber side have insufficient adhesion (pressure contact) between the ion exchange membrane and the packing or the insulating film. is there. On the other hand, the latter configuration is effective when the surfaces of the packing and the anode in contact with the ion exchange membrane are on the same line, but it is generally difficult to process such a shape with a material such as titanium for the anode. In many cases, the surfaces of the packing and the anode cannot be located on the same line, and especially when the packing surface is convex, the ion exchange membrane and the packing are not sufficiently adhered.
（問題点を解決するための手段） 本発明者等は、フィルタープレス型電解槽におけるイオ
ン交換膜の上記した如き劣化について着目して、その防
止するための簡便な手段について鋭意検討した。その結
果、イオン交換膜を予め膨潤等の処理により寸法安定化
した状態で該イオン交換膜の所定部分におけるイオン交
換基を除去した後、該イオン交換膜をフィルタープレス
型電解槽に装着することによって、アルカリ金属塩水溶
液の電解における問題点が容易に解消される効果を見い
出し、本発明を提供するに至った。即ち、本発明はイオ
ン交換膜と電極室枠とを交互に多数配列して締め付けた
フィルタープレス型アルカリ金属塩水溶液の電解槽にお
いて、イオン交換膜を予め寸法安定化処理した後、該イ
オン交換膜を寸法安定化した状態で、少なくとも電極室
枠との締付面の内縁より内側の周辺部に存在する該イオ
ン交換膜のイオン交換基を除去して電解槽に装着するこ
とを特徴とするイオン交換膜の装着方法である。(Means for Solving Problems) The inventors of the present invention paid attention to the above-mentioned deterioration of the ion exchange membrane in the filter press type electrolytic cell, and earnestly studied a simple means for preventing the deterioration. As a result, by removing the ion exchange group in a predetermined portion of the ion exchange membrane in a state where the ion exchange membrane is dimensionally stabilized by a treatment such as swelling in advance, the ion exchange membrane is mounted in a filter press type electrolytic cell. The inventors have found the effect of easily solving problems in the electrolysis of an aqueous solution of an alkali metal salt, and have provided the present invention. That is, the present invention is a filter press type alkaline metal salt aqueous solution electrolytic cell in which a large number of ion-exchange membranes and electrode chamber frames are alternately arranged and tightened, and the ion-exchange membranes are preliminarily subjected to dimensional stabilization treatment and then the ion-exchange membranes. Is dimensionally stabilized, and at least the ion-exchange groups of the ion-exchange membrane present in the peripheral portion inside the inner edge of the tightening surface with the electrode chamber frame are removed and the ion-exchange membrane is attached to the electrolytic cell. This is a method of attaching an exchange membrane.
本発明に用いる電解槽は、イオン交換膜と電極室枠とを
パッキンを介して交互に多数配列して締め付けたフィル
タープレス型の構成を有する限りにおいて、単極型でも
複極型でもよい。電解槽に用いられる電極室枠は、一般
に額縁状の形状を有し、その内部に陽極または陰極がそ
れぞれ取付け構成された陽極室枠および陰極室枠とがあ
る。陽極室枠の材質は耐塩素性の金属やプラスチック、
また陰極室枠は耐アルカリ性の金属やプラスチックが使
用される。この際、電極室枠の細かな形状は電極や電極
の形状により任意に選定すればよく、また電極の材質，
形状等も公知のものが特に制限なく使用できるが、特に
孔径の小さいものが加工性に優れるため好ましく用いら
れる。また、パッキンは中央に欠損部を有する形状で、
該パッキンの外形，欠損部の形状，サイズ，厚み及び材
質等は特に限定されるものでない。The electrolytic cell used in the present invention may be of a single-pole type or a double-pole type as long as it has a filter press type configuration in which a large number of ion exchange membranes and electrode chamber frames are alternately arranged via packing and tightened. The electrode chamber frame used in the electrolytic cell generally has a frame-like shape, and there are an anode chamber frame and a cathode chamber frame in which an anode or a cathode is attached and configured respectively. The material of the anode chamber frame is chlorine-resistant metal or plastic,
The cathode chamber frame is made of alkali-resistant metal or plastic. At this time, the fine shape of the electrode chamber frame may be arbitrarily selected according to the shape of the electrode and the electrode, and the material of the electrode,
Known shapes and the like can be used without particular limitation, but those having a small pore size are particularly preferably used because they have excellent workability. Also, the packing has a shape with a defect in the center,
The outer shape of the packing, the shape, size, thickness, material and the like of the defective portion are not particularly limited.
本発明における最大の特徴は、上記したフィルタープレ
ス型電解槽に装着するイオン交換膜を予め寸法安定化処
理した後、電極室枠との締付面の内縁より内側の周辺部
に存在する該イオン交換膜のイオン交換基を除去するこ
とにある。即ち、このような処理したイオン交換膜を装
着した電解槽においては、電極室枠との締付部の内縁よ
り内側に存在する部分の該イオン交換膜がイオン交換基
を有していないため、その部分には電解電流が流れず、
したがって、上記した締め付け部におけるイオン交換膜
の水ぶくれによる破損が防止される。かかる本発明の効
果を達成するためには、特にイオン交換膜を予め寸法安
定化処理することが極めて重要である。即ち、予め寸法
安定化処理をすることなく単に所定部分のイオン交換基
を抜いたイオン交換膜あるいは所定部分のイオン交換基
を抜いた後に寸法安定化処理したイオン交換膜を装着し
た電解槽においては、該イオン交換膜が電解時に接触す
る溶液により膨潤あるいは収縮してシワまたはピンホー
ルの発生に至ったり、イオン交換基を除去した膜部分の
位置がズレるため締め付け部において水ぶくれが生じる
結果を招く。なお、本発明において「内側」とは電極室
内部という意味で、イオン交換膜においてイオン交換基
を除去する部分は少なくとも締付部の内縁より内側の周
辺部であり、一般には電極室枠の内周縁部より５〜５０
mm程度の内側である。The greatest feature of the present invention is that the ion-exchange membrane to be mounted on the above-mentioned filter press type electrolytic cell is subjected to dimensional stabilization treatment in advance, and then the ions present in the peripheral portion inside the inner edge of the tightening surface with the electrode chamber frame. The purpose is to remove the ion exchange groups of the exchange membrane. That is, in an electrolytic cell equipped with such a treated ion-exchange membrane, since the ion-exchange membrane in the portion existing inside the inner edge of the tightened portion with the electrode chamber frame does not have an ion-exchange group, Electrolytic current does not flow in that part,
Therefore, damage due to blistering of the ion exchange membrane in the above-mentioned tightening portion is prevented. In order to achieve the effects of the present invention, it is extremely important to subject the ion exchange membrane to a dimensional stabilization treatment in advance. That is, in an electrolytic cell equipped with an ion exchange membrane in which a predetermined portion of the ion exchange group is simply removed without performing a dimension stabilization treatment in advance or an ion exchange membrane in which a dimension stabilization treatment is performed after the predetermined portion of the ion exchange group is removed is attached. The ion exchange membrane swells or contracts due to the solution that is contacted during the electrolysis, resulting in the generation of wrinkles or pinholes, or the position of the membrane portion from which the ion exchange groups are removed is displaced, resulting in blistering at the tightening portion. In the present invention, "inside" means the inside of the electrode chamber, and the portion of the ion exchange membrane where the ion exchange groups are removed is at least the peripheral portion inside the inner edge of the tightening portion, and generally the inside of the electrode chamber frame. 5 to 50 from the periphery
The inside is about mm.
本発明に用いられる寸法安定化処理は、イオン交換膜を
アルカリ金属塩水溶液の電解に、供するに際して、該膜
が電解溶液により膨潤または収縮しないように安定化す
ることで、公知の方法が特に制限なく用いられる。例え
ばイオン交換膜をNaHCO3溶液に漬浸し、次いで純水に漬
浸する方法、イオン交換膜を膨潤させる溶媒と接触させ
た後、周辺を固定して収縮させる処理を施こす方法（特
開昭58-163446号）、さらに固定した状態で熱処理を行
い、次いで再び有機溶媒で膨潤させる方法（特開昭59-8
4925号）などがある。これらの方法に用いる溶媒として
は、例えばメタノール，エタノール，プロパノール，エ
チレングリコール、プロピレングリコール，グリセリン
等の１〜３価のアルコールやエーテル，水等が一般的で
ある。また、上記したイオン交換膜の膨潤は、線倍率が
1.1倍以上となるように溶媒に漬浸する方法、また収縮
は乾燥により５０〜１００％の復元率で収縮させる方法
が一般的であり、これらはイオン交換膜の種類や電解条
件等に応じて適宜選定すればよい。The dimensional stabilization treatment used in the present invention, when subjecting the ion exchange membrane to the electrolysis of an aqueous solution of an alkali metal salt, stabilizes the membrane so as not to swell or shrink by the electrolytic solution, and a known method is particularly limited. Used without. For example, a method of dipping the ion exchange membrane in a NaHCO 3 solution and then dipping it in pure water, a method of contacting with a solvent for swelling the ion exchange membrane, and then performing a treatment of fixing and shrinking the periphery (Japanese Patent Laid-Open Publication No. 2006-242242) 58-163446), and further heat treatment in a fixed state, and then swelling again with an organic solvent (JP-A-59-8).
No. 4925). As a solvent used in these methods, for example, a trivalent alcohol such as methanol, ethanol, propanol, ethylene glycol, propylene glycol, glycerin, ether, water, etc. are generally used. Further, the swelling of the above-mentioned ion exchange membrane has a linear magnification
The method is generally soaked in a solvent so that the ratio is 1.1 times or more, and the shrinkage is generally a method of shrinking by drying at a restoration rate of 50 to 100%. These are selected depending on the type of the ion exchange membrane and the electrolysis conditions. It may be selected appropriately.
本発明においてイオン交換膜の所定部分におけるイオン
交換基を除去する方法は、イオン交換膜を寸法安定化し
た状態で実施されるものであれば、該イオン交換膜のイ
オン交換基の種類に応じて公知の方法を適宜採用するこ
とができるが、一般に熱プレスによる方法が好ましい。
したがって、電解槽は、寸法安定化処理したイオン交換
膜の予め決定した所定の位置に熱プレスした該イオン交
換膜を装着する方法、或いはイオン交換膜の装着時に直
接に熱プレスする方法などによって構成される。かかる
熱プレスの条件はイオン交換膜の種類により異なるが、
パーフルオロカーボン系の陽イオン交換膜の場合には一
般に５kg／cm2以上の圧力で３００℃以上の温度に１０
秒以上接触させる方法が適当である。In the present invention, the method for removing the ion-exchange group in a predetermined portion of the ion-exchange membrane is carried out depending on the type of the ion-exchange group of the ion-exchange membrane as long as it is carried out in a state in which the ion-exchange membrane is dimensionally stabilized. A known method can be adopted as appropriate, but a method using hot pressing is generally preferred.
Therefore, the electrolytic cell is constructed by a method of mounting the ion-exchange membrane that has been heat-pressed at a predetermined position on the dimension-stabilized ion-exchange membrane, or a method of directly hot-pressing when mounting the ion-exchange membrane. To be done. The conditions of such hot pressing differ depending on the type of ion exchange membrane,
In the case of a perfluorocarbon-based cation exchange membrane, generally, a pressure of 5 kg / cm 2 or more and a temperature of 300 ° C. or more are used.
A method of contacting for more than a second is suitable.
本発明に用いられるイオン交換膜は、アルカリ金属塩水
溶液の電解に耐久性を有するものであれば特に制限され
ないが、一般には陽イオン交換基を有する所謂パーフロ
ロカーボン系の陽イオン交換膜が好適に用いられる。
又、アルカリ金属塩水溶液の電解方法は、例えば陽極室
に３〜５規定(N)の塩化ナトリウム等の塩水を供給し、
一方の陰極室には水または希釈アルカリ金属塩水溶液を
供給し、一般に常温〜９５℃の温度、電流密度１０〜５
０Ａ／dm2の条件で電解を行なう方法など公知のイオン
交換膜法プロセスにおける条件を特に制限なく採用する
ことができる。The ion exchange membrane used in the present invention is not particularly limited as long as it has durability for electrolysis of an alkali metal salt aqueous solution, but generally a so-called perfluorocarbon cation exchange membrane having a cation exchange group is suitable. Used.
The method of electrolyzing an aqueous solution of an alkali metal salt is, for example, supplying salt water such as sodium chloride of 3 to 5 N (N) to the anode chamber,
Water or a dilute alkali metal salt aqueous solution is supplied to one of the cathode chambers, and the temperature is generally room temperature to 95 ° C. and the current density is 10 to 5
The conditions in the known ion-exchange membrane process such as a method of electrolyzing under the condition of 0 A / dm 2 can be adopted without particular limitation.
（効果） 本発明によれば、イオン交換膜を寸法安定化処理した
後、電極室枠との締付面の内縁より内側に存在するイオ
ン交換基を除去して電解槽に装着するため、電解槽を締
め付けた際に該イオン交換膜の膨潤或いは収縮による寸
法変化がなく、しかも、電極室枠との締付面の内縁より
内側に存在するイオン交換膜の部分がイオン交換基を有
さないため、電解時における前記した諸問題を解決する
ことができる。(Effect) According to the present invention, after the ion-exchange membrane is dimensionally stabilized, the ion-exchange group existing inside the inner edge of the tightening surface with the electrode chamber frame is removed and mounted in the electrolytic cell. There is no dimensional change due to swelling or contraction of the ion exchange membrane when the tank is tightened, and the portion of the ion exchange membrane existing inside the inner edge of the tightening surface with the electrode chamber frame does not have an ion exchange group. Therefore, the above-mentioned various problems at the time of electrolysis can be solved.
（実施例） 以下、本発明を実施例に基づき詳細に説明するが、本発
明は以下の実施例に特に限定されるものではない。(Examples) Hereinafter, the present invention will be described in detail based on examples, but the present invention is not particularly limited to the following examples.
実施例１ パーフロロカーボン系の陽イオン交換膜（Ｋ型）を、膜
面積m2当り６０の２％NaHCO3水溶液に２５℃の温度で
８時間漬浸し、その後に膜面積当り６０の純水に２５
℃の温度で８時間漬浸して寸法安定化処理を行なった。Example 1 A perfluorocarbon type cation exchange membrane (K type) was immersed in 60% 2% NaHCO 3 aqueous solution per membrane area m 2 at a temperature of 25 ° C. for 8 hours, and then in 60 pure water per membrane area. 25
A dimension stabilization treatment was carried out by dipping at a temperature of ° C for 8 hours.
その後、陽イオン交換膜の陽極ガスケットの内縁部に相
当する部分より外側に１０mm幅、内側に２０mm幅で湿状
態（寸法安定化した状態）のまま下記条件で熱プレスを
行い、上記の該当部分のイオン交換基を除去した。得ら
れたイオン交換膜を電解槽に装着し、下記条件で３６０
日間電解した後に膜を取り出したところ、膜面に水ぶく
れの発生は見られなかった。また、電流効率も初期９６
％でスタートし最終的に９５％を保った。After that, hot pressing is performed under the following conditions with a width of 10 mm on the outside and a width of 20 mm on the inside of the cation exchange membrane corresponding to the inner edge portion of the anode gasket, under the following conditions, and the above-mentioned portion The ion-exchange group of was removed. The obtained ion-exchange membrane was attached to an electrolytic cell, and 360
When the film was taken out after electrolysis for a day, no blistering was observed on the film surface. Also, the current efficiency is 96
%, And finally kept 95%.
熱プレス条件： プレス圧：１０kg／cm2Ｇ 温度：３００〜３５０℃ 加熱時間：２０sec 電解条件： 電流密度：４０Ａ／dm2 電解温度：９０℃ 陽極液ＮａＣ濃度：２１０ｇ／ 陰極液NaOH濃度：３２wt％ 通電面積：２．７m2 比較例１ 実施例に示す寸法安定化処理を実施した後、熱プレスを
実施しないままに電解槽に装着し、３６０日間電解した
後に膜を取り出したところ、陽極ガスケット内縁部に沿
って膜面に水ぶくれが生じていた。また電流効率も初期
９６％でスタートしたが最終的に９０％まで低下した。Hot pressing conditions: Pressing pressure: 10 kg / cm 2 G Temperature: 300 to 350 ° C. Heating time: 20 sec Electrolysis conditions: Current density: 40 A / dm 2 Electrolysis temperature: 90 ° C. Anode solution NaC concentration: 210 g / Cathode solution NaOH concentration: 32 wt % Current-carrying area: 2.7 m 2 Comparative Example 1 After carrying out the dimension stabilization treatment shown in the example, the film was taken out after being mounted in an electrolytic cell without hot pressing and electrolyzing for 360 days. Blistering occurred on the film surface along the inner edge. The current efficiency started at 96% in the initial stage, but finally decreased to 90%.
比較例２ 熱プレスを実施した後に実施例に示す寸法安定化処理を
実施したところ、熱プレスを実施した部分と実施しなか
った部分とで膜の伸び率が大きく異なるためシワが発生
し電槽への膜セットが出来なかった。Comparative Example 2 When the dimensional stabilization treatment shown in the example was carried out after the hot pressing was carried out, wrinkles were generated because the elongation of the film was greatly different between the part where the hot pressing was carried out and the part where the hot pressing was not carried out, resulting in a battery case. I could not set the membrane to.
比較例３ 実施例１に基づき、寸法安定化処理を実施した。Comparative Example 3 Based on Example 1, dimension stabilization treatment was performed.
その後、膜を乾燥させ、実施例１の寸法及び条件で熱プ
レスを実施してイオン交換基を除去した。得られたイオ
ン交換膜を電解槽に装着し、２００日間電解した後に膜
を取り出したところ、電解時に接触する溶液により、膜
が膨潤してシワが発生し、シワの頂部にピンホールが発
生していた。また、電流効率も初期９６％でスタートし
たが、最終的に９２％まで低下した。After that, the membrane was dried and hot-pressed under the dimensions and conditions of Example 1 to remove the ion-exchange groups. The obtained ion-exchange membrane was mounted in an electrolysis tank, and after electrolysis for 200 days, the membrane was taken out, and the solution that came into contact during electrolysis swelled the membrane to generate wrinkles and pinholes on the top of the wrinkles. Was there. The current efficiency also started at 96% in the initial stage, but finally dropped to 92%.
Claims (1)
列して締め付けて構成するフィルタープレス型アルカリ
金属塩水溶液の電解槽において、イオン交換膜を予め寸
法安定化処理した後、該イオン交換膜を寸法安定化した
状態で、少なくとも電解室枠との締付面における内縁よ
り内側の周辺部に存在するイオン交換膜のイオン交換基
を除去して電解槽に装着することを特徴とするイオン交
換膜の装着方法。1. In a filter press type alkaline metal salt aqueous solution electrolytic bath constituted by alternately arranging a plurality of ion exchange membranes and electrolysis chamber frames and tightening them, the ion exchange membranes are preliminarily subjected to dimensional stabilization treatment, and then the ions are formed. The dimension of the exchange membrane is stabilized, and at least the ion exchange group of the ion exchange membrane existing in the peripheral portion inside the inner edge of the tightening surface with the electrolytic chamber frame is removed, and the exchange membrane is mounted in the electrolytic cell. How to attach the ion exchange membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61076741A JPH0631452B2 (en) | 1986-04-04 | 1986-04-04 | How to attach the ion exchange membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61076741A JPH0631452B2 (en) | 1986-04-04 | 1986-04-04 | How to attach the ion exchange membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62235492A JPS62235492A (en) | 1987-10-15 |
| JPH0631452B2 true JPH0631452B2 (en) | 1994-04-27 |
Family
ID=13614027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61076741A Expired - Lifetime JPH0631452B2 (en) | 1986-04-04 | 1986-04-04 | How to attach the ion exchange membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631452B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040097603A1 (en) * | 2001-02-07 | 2004-05-20 | Takuya Hasegawa | Ion-exchange fluororesin membrane |
| US7037949B2 (en) | 2001-02-07 | 2006-05-02 | Asahi Kasei Chemicals Corporation | Ion-exchange resin membrane and method for producing the same |
| JP5894787B2 (en) * | 2011-03-17 | 2016-03-30 | 優章 荒井 | Electrolyzed water production equipment |
| JP7136580B2 (en) * | 2018-04-17 | 2022-09-13 | 旭化成株式会社 | Diaphragm, method for manufacturing diaphragm, electrolytic cell, and method for producing hydrogen |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163446A (en) * | 1982-03-25 | 1983-09-28 | Tokuyama Soda Co Ltd | Treatment of ion exchange membrane |
| JPS5928558U (en) * | 1982-08-17 | 1984-02-22 | 株式会社トクヤマ | Filter press type electrolytic cell |
| JPS5984925A (en) * | 1982-11-04 | 1984-05-16 | Tokuyama Soda Co Ltd | Method for treating cation exchange membrane |
| JPS5976565U (en) * | 1982-11-17 | 1984-05-24 | 株式会社トクヤマ | Filter press type electrolytic cell |
| JPS59125972A (en) * | 1983-01-07 | 1984-07-20 | 伴 実 | Treatment for modifying silk fiber |
| JPS6059088A (en) * | 1983-09-09 | 1985-04-05 | Tokuyama Soda Co Ltd | Method for sealing ion exchange membrane and gasket |
-
1986
- 1986-04-04 JP JP61076741A patent/JPH0631452B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62235492A (en) | 1987-10-15 |
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