JPH04154980A - Electrolytic cell - Google Patents
Electrolytic cellInfo
- Publication number
- JPH04154980A JPH04154980A JP2276447A JP27644790A JPH04154980A JP H04154980 A JPH04154980 A JP H04154980A JP 2276447 A JP2276447 A JP 2276447A JP 27644790 A JP27644790 A JP 27644790A JP H04154980 A JPH04154980 A JP H04154980A
- Authority
- JP
- Japan
- Prior art keywords
- chamber frame
- gasket
- anode chamber
- flange surface
- exchange 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.)
- Pending
Links
- 239000003513 alkali Substances 0.000 claims abstract description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000012528 membrane Substances 0.000 abstract description 31
- 238000005341 cation exchange Methods 0.000 abstract description 29
- 230000007797 corrosion Effects 0.000 abstract description 19
- 238000005260 corrosion Methods 0.000 abstract description 19
- 238000005868 electrolysis reaction Methods 0.000 abstract description 9
- 229920001971 elastomer Polymers 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 150000002739 metals Chemical class 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 9
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 hypochlorite ions Chemical class 0.000 description 3
- 239000003014 ion exchange membrane Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PEVRKKOYEFPFMN-UHFFFAOYSA-N 1,1,2,3,3,3-hexafluoroprop-1-ene;1,1,2,2-tetrafluoroethene Chemical group FC(F)=C(F)F.FC(F)=C(F)C(F)(F)F PEVRKKOYEFPFMN-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- FAUWSVSZYKETJJ-UHFFFAOYSA-N palladium titanium Chemical group [Ti].[Pd] FAUWSVSZYKETJJ-UHFFFAOYSA-N 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、塩化アルカリ水溶液の電解に用いられる電解
槽に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrolytic cell used for electrolysis of an aqueous alkali chloride solution.
［従来の技術］
従来用いられているイオン交換脱法電解槽としては、陽
極を取付けた金属製の陽極室枠と、陰極を取付けた金属
製の陰極室枠を陽イオン交換膜を介して締め付ける、い
わゆるフィルタープレス型電解槽、並びに袋状陽イオン
交換膜を陽極室枠内、又は陰極室枠内に内装したボック
ス型電解槽などが知られており、これらの電解槽は、室
枠同志の機密性及びシール性を保つために通常、ガスケ
ットをそれぞれの室枠のフランジ面に配して締め付けて
シールし、液及びガスの洩れを防止している。[Prior Art] Conventionally used ion exchange dehydration electrolytic cells are made by tightening a metal anode chamber frame with an anode attached thereto and a metal cathode chamber frame with a cathode attached through a cation exchange membrane. So-called filter press type electrolytic cells and box-type electrolytic cells in which a bag-shaped cation exchange membrane is installed inside the anode chamber frame or the cathode chamber frame are known. In order to maintain safety and sealability, a gasket is usually placed on the flange surface of each chamber frame and tightened to form a seal to prevent leakage of liquid and gas.
このシール方法については、陽イオン交換膜の締め付は
部における損傷を防止するために、適度な硬度及び弾性
を有するガスケットを用いたり、ガスケットの取付は方
法や締め付は面圧を細かく調整したりして種々工夫され
ている。Regarding this sealing method, in order to prevent damage to the cation exchange membrane, a gasket with appropriate hardness and elasticity is used, and the mounting method and tightening of the gasket are adjusted by finely adjusting the surface pressure. Various improvements have been made.
また塩化アルカリ水溶液電解槽の陽極室内には電解反応
によって発生する塩素ガス及び陽イオン交換膜を通して
陰極室側より拡散してくる水酸化アルカリと塩素ガスと
が反応して生ずる次亜塩素酸イオンが常時存在すること
から、通常ガスケットとして、上記塩素ガス等に対して
耐食性が優れているエチレンプロピレンゴム（以下ＥＰ
ＤＭと略す。）などが用いられる。In addition, in the anode chamber of the aqueous alkali chloride electrolyzer, there are chlorine gas generated by the electrolytic reaction and hypochlorite ions produced by the reaction between the alkali hydroxide and chlorine gas that diffuse from the cathode chamber side through the cation exchange membrane. Because it is always present, ethylene propylene rubber (hereinafter referred to as EP), which has excellent corrosion resistance against chlorine gas, etc., is usually used as a gasket.
Abbreviated as DM. ) etc. are used.
しかしながら、ガスケットの内周部のうち、フランジ面
と接触していない露出部は、流動している塩素ガスや次
亜塩素酸イオンによって僅かずっ腐食浸食され、この腐
食は経時的に進行し、次第にガスケットの内周部が減肉
していく。However, the exposed part of the inner circumference of the gasket that is not in contact with the flange surface is slightly corroded by the flowing chlorine gas and hypochlorite ions, and this corrosion progresses over time and gradually The inner circumference of the gasket is becoming thinner.
陽イオン交換膜を用いた塩化アルカリ水溶液の電気分解
において、通常、陰極室内圧力を陽極室内圧力よりも大
きく保ちながら運転される。このため陽イオン交換膜は
常に陽極側に押し付けられた状態にある。従ってガスケ
ットが減肉した空隙部の陽イオン交換膜はフランジ面に
直接に接触する形で押しつけられる事になる。In electrolysis of an aqueous alkali chloride solution using a cation exchange membrane, the operation is usually performed while maintaining the pressure inside the cathode chamber higher than the pressure inside the anode chamber. Therefore, the cation exchange membrane is always pressed against the anode side. Therefore, the cation exchange membrane in the gap where the gasket has thinned is pressed into direct contact with the flange surface.
この空隙部の陽イオン交換膜においては、正常な陽イオ
ン交換膜内で起こる物質移動現象とは異なった物質移行
、例えば塩化アルカリの供給不足、過度の水の移行や拡
散によるアルカリの逆移行が起こり、陽イオン交換膜の
剥離や性能劣化、更には強度低下などの不具合が生じ、
最終的には陽イオン交換膜にピンホールが発生する。こ
のピンホールを通して陰極側より高濃度アルカリが陽極
室枠フランジ面に向って直接漏洩することになり、チタ
ン又はチタン合金よりなる陽極室枠フランジ面は、アル
カリによる腐食及び減肉などの致命的ダメージを受け、
電解槽そのものの再使用に支障をきたすという大きな問
題点が生じる。In the cation exchange membrane in this cavity, mass transfer phenomena that differ from those that occur in a normal cation exchange membrane occur, such as insufficient supply of alkali chloride, excessive water migration, and back migration of alkali due to diffusion. This causes problems such as peeling of the cation exchange membrane, deterioration of performance, and even a decrease in strength.
Eventually, pinholes will occur in the cation exchange membrane. Through this pinhole, highly concentrated alkali will leak directly from the cathode side toward the anode chamber frame flange surface, and the anode chamber frame flange surface made of titanium or titanium alloy will suffer fatal damage such as corrosion and thinning due to the alkali. receive,
This poses a major problem in that it hinders the reuse of the electrolytic cell itself.
［発明が解決しようとする課題］
本発明は、陽イオン交換膜を用いた塩化アルカリ水溶液
を電気分解するための電解槽において、陽極室枠フラン
ジ面の腐食及び減肉を防止し、長期間に亘り、安定した
塩化アルカリ水溶液の電解操業を継続させることのでき
る電解槽を提供することにある。[Problems to be Solved by the Invention] The present invention prevents corrosion and thinning of the flange surface of the anode chamber frame in an electrolytic cell for electrolyzing an aqueous alkali chloride solution using a cation exchange membrane, and provides a long-term solution. The object of the present invention is to provide an electrolytic cell that can continue stable electrolysis operation of aqueous alkali chloride solution.
［問題点を解決するための手段］
塩化アルカリ水溶液電解め長期間に亘る運転後、陽イオ
ン交換膜の更新の為、電解を停止し、電解槽を解体して
点検した所、電解槽の陽極室枠フランジの内側端部から
数ｍｍの＋ｌ］で局部的にフランジ面が腐食及び減肉し
ている事態に幾度か遭遇した。これらの腐蝕及び減肉の
ダメージを受けていた場所のガスケット及び陽イオン交
換膜について詳細に観察した所、ガスケットは腐食及び
減肉によって一部欠落しており、又、陽イオン交換膜で
は、水泡の様な剥離現象が見られ、洩れテストの結果、
小さなピンホールと思われるリークが発見された。一方
、ダメージを受けていない場所の陽イオン交換膜につい
ては異常は見られなかった。[Means to solve the problem] After long-term operation of aqueous alkali chloride electrolysis, electrolysis was stopped in order to renew the cation exchange membrane, and when the electrolytic cell was dismantled and inspected, the anode of the electrolytic cell was Several times, I encountered a situation where the flange surface was locally corroded and thinned several mm away from the inner end of the chamber frame flange. A detailed observation of the gaskets and cation exchange membranes at locations that had been damaged by corrosion and thinning revealed that some parts of the gaskets were missing due to corrosion and thinning, and the cation exchange membrane had blisters. A peeling phenomenon like this was observed, and as a result of the leakage test,
A leak, believed to be a small pinhole, was discovered. On the other hand, no abnormality was observed in the cation exchange membrane in the undamaged area.
本発明者らは、上記の知見から陽極室枠フランジ面の腐
食及び減肉の原因は、陽極室枠に配しているガスケット
の腐食及び減肉に起因し、このガスケット減肉部におい
て、陽イオン交換膜にピンホールが生じ、このピンホー
ルを通じて高濃度アルカリが陽極室枠フランジ面に直接
漏洩して、チタン又はチタン合金よりなるフランジ面を
腐食させることによることを見出だした。Based on the above findings, the present inventors believe that the cause of corrosion and thinning of the anode chamber frame flange surface is due to the corrosion and thinning of the gasket disposed on the anode chamber frame, and that It was discovered that pinholes are formed in the ion exchange membrane, and high concentration alkali leaks directly through the pinholes to the flange surface of the anode chamber frame, corroding the flange surface made of titanium or titanium alloy.
本発明者らは、これらの陽極室枠フランジ面の腐食及び
減肉を抑制する方策について鋭意検討した結果、陽極室
枠フランジ面と陽イオン交換膜との間にフッ素系樹脂シ
ートを介在すれば、陽イオン交換膜のピンホールを通し
ての高濃度アルカリの漏洩によるフランジ面の腐食及び
減肉を防止することか可能となり、安定した塩化アルカ
リ水溶液の電解操業が長期間に亘り達成できることを見
出だし本発明を完成するに至った。As a result of intensive study on measures to suppress corrosion and thinning of the anode chamber frame flange surface, the present inventors found that if a fluororesin sheet is interposed between the anode chamber frame flange surface and the cation exchange membrane. This book is based on the discovery that it is possible to prevent corrosion and thinning of the flange surface due to leakage of highly concentrated alkali through pinholes in the cation exchange membrane, and that stable electrolytic operation of aqueous alkali chloride solutions can be achieved over a long period of time. The invention was completed.
即ち本発明は、金属製の陽極室枠と陰極室枠にそれぞれ
ゴム弾性を有するガスケットを配し、陽イオン交換膜を
締め付けてなる塩化アルカリ水溶液を電気分解するため
の電解槽に於いて、陽極室枠フランジ面とガスケットと
の間にフッ素系樹脂シートが介在していることを特徴と
する電解槽である。That is, the present invention provides an anode in an electrolytic cell for electrolyzing an aqueous alkali chloride solution, in which a metal anode chamber frame and a cathode chamber frame are each provided with a gasket having rubber elasticity, and a cation exchange membrane is tightened. This electrolytic cell is characterized in that a fluororesin sheet is interposed between the chamber frame flange surface and the gasket.
［作用］ 以下、本発明の詳細な説明する。[Effect] The present invention will be explained in detail below.
本発明の電解槽は、塩化アルカリ水溶液の電解に用いら
れる通常の電解槽に適用することができる。The electrolytic cell of the present invention can be applied to a normal electrolytic cell used for electrolysis of an aqueous alkali chloride solution.
本発明の電解槽は、ガスケットと陽極室枠フランジとの
間にフッ素系樹脂シートが介在しているものである。そ
の介在に当たっては、陽極室枠フランジ面内周端部より
外周側へ５ｍｍ以上、好ましくは１０ｍｍ以上行う。In the electrolytic cell of the present invention, a fluororesin sheet is interposed between the gasket and the anode chamber frame flange. The interposition is performed by 5 mm or more, preferably 10 mm or more, from the inner peripheral end of the anode chamber frame flange surface to the outer peripheral side.
本発明において使用するフッ素系樹脂シートは特に限定
されないが、例えば四フッ化エチレン（ＰＴＦＥ）、四
フッ化エチレン六フッ化プロピレン（ＦＥＰ）、フッ化
ヒニリデン（ＰＶＤＰ）あるいは４フッ化エチレン−パ
ーフルオロアルキルビニルエーテル（ＰＦＡ）よりなる
シートなどが挙げられる。The fluororesin sheet used in the present invention is not particularly limited, but for example, tetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene (FEP), hynylidene fluoride (PVDP), or tetrafluoroethylene-perfluorocarbon Examples include sheets made of alkyl vinyl ether (PFA).
シートの厚みは、陽極室枠フランジとガスケット及び陽
イオン交換膜との機密性を損なわないシール性を与える
ために１，０ｍｍ以下であることが好ましく、更に好ま
しくは０．３ｍｍ以下である。シートが厚い場合は、弾
性の大きいガスケットを選択したり、又、締め付は面圧
を大きくすることなどにより機密性を保つ事ができる。The thickness of the sheet is preferably 1.0 mm or less, more preferably 0.3 mm or less, in order to provide a seal that does not impair the airtightness between the anode chamber frame flange, gasket, and cation exchange membrane. If the sheet is thick, airtightness can be maintained by selecting a gasket with high elasticity or by increasing the surface pressure when tightening.
シートの取り付けに当たっては、陽極室枠フランジ部に
予め接着剤を塗布して貼り付けるか、接着剤のついたテ
ープ状のシートを貼り付けても良い。後者の場合、作業
性も良く、又精度良く取り付は可能であり、好ましい。When attaching the sheet, an adhesive may be applied to the flange portion of the anode chamber frame in advance and attached, or a tape-like sheet coated with adhesive may be attached. In the latter case, workability is good and installation can be performed with high precision, which is preferable.
以下、本発明を図面を基に説明する。Hereinafter, the present invention will be explained based on the drawings.
第１図は、フィルタープレス型イオン交換膜法電解槽に
ついて、本発明の一実施態様を示す極室枠フランジ部の
シール部分の断面図である。FIG. 1 is a sectional view of a sealing portion of a flange portion of an electrode chamber frame showing an embodiment of the present invention in a filter press type ion exchange membrane method electrolytic cell.
陽イオン交換膜３は陽極側面にゴム弾性を有するガスケ
ット１を介して陽極室枠５が配置される。In the cation exchange membrane 3, an anode chamber frame 5 is arranged on the side surface of the anode with a gasket 1 having rubber elasticity interposed therebetween.
このガスケット１の内周部はフッ素系樹脂シート２で完
全に覆われている。一方、陰極側面においてもやはりゴ
ム弾性を有するガスケット４を介して陰極室枠６が配置
されている。陽極室枠５及び陰極室枠６にはそれぞれ多
孔性の陽極７及び多孔性の陰極８が取り付けられている
。The inner peripheral portion of this gasket 1 is completely covered with a fluororesin sheet 2. On the other hand, on the side surface of the cathode, a cathode chamber frame 6 is also placed via a gasket 4 having rubber elasticity. A porous anode 7 and a porous cathode 8 are attached to the anode chamber frame 5 and the cathode chamber frame 6, respectively.
このうち本発明の特徴は、陽極側面のガスケット１が陽
極室内に露出しないよう、ガスケットの内周部がフッ素
系樹脂シート２で完全に覆われている点にある。Among these, the present invention is characterized in that the inner circumferential portion of the gasket 1 on the side surface of the anode is completely covered with a fluororesin sheet 2 so that the gasket 1 on the side surface of the anode is not exposed in the anode chamber.
［実施例］
以下、本発明を実施例に基づき説明するが、本発明はこ
れらに限定されるものではない。[Examples] The present invention will be described below based on Examples, but the present invention is not limited thereto.
実施例、１
陽極室枠フランジ材質がパラジウム−チタン合金、又、
陰極室枠フランジ材質がニッケルよりなる内寸法２．３
４０ｍｍ巾、１，４００ｍｍ高、外寸法２，４２０ｍｍ
ｒｌ＞、１，４８０ｍｎｎ高の大きさの電解槽の陽極室
枠フランジ面の内周部に第１図に示すＩｌｌ ２６ ｍ
ｍ ｓ厚さ０．０８ｍｍの片面に接着剤を有したＰＴ
ＦＥからなるフッ素系樹脂シート２を貼り付け、ガスケ
ラｌ−１，４として厚さ２ｍｍのＥＰＤＭ製ゴムシート
（硬度６５）及び陽イオン交換膜（デュポン社製ナフィ
オン９０２０９）３を装着してイオン交換脱法電解槽を
組み立てた。この電解槽を用いて、塩化ナトリウム水溶
液の電解を以下の条件で３６ケ月運転した。Example 1: The material of the anode chamber frame flange is palladium-titanium alloy, and
Cathode chamber frame flange material is nickel Inner dimensions 2.3
40mm width, 1,400mm height, external dimensions 2,420mm
Ill 26 m shown in Fig. 1 on the inner circumference of the anode chamber frame flange surface of an electrolytic cell with a height of 1,480 mnn.
PT with adhesive on one side, 0.08 mm thick
A fluororesin sheet 2 made of FE is attached, and a 2 mm thick EPDM rubber sheet (hardness 65) and a cation exchange membrane (DuPont Nafion 90209) 3 are attached as Gaskera l-1, 4 for ion exchange. Assembled an electrolytic cell. Using this electrolytic cell, electrolysis of a sodium chloride aqueous solution was operated for 36 months under the following conditions.
有効電極、膜面積 ：３．２７６ｍ２電流密度
： ３．５ＫＡ／ｍ”運転温度
：８５〜９０℃陰極室苛性ソーダ濃度 ：３２〜３３
ｗｔ％陽極室塩水濃度 ：２０５±１０ｇ／Ｊ！
運転停止後、陽イオン交換膜、ガスケット及び陽極室枠
フランジ面について点検を行った。陽極室側に使用した
ガスケットの内周部全周に亘り、腐食及び減肉が見られ
、大きい所では１１ｍｍの減肉があった。このガスケッ
トの減肉部に接する陽イオン交換膜に於いては、局所的
に水泡現象が見られ、一部に微細なピンホールが発見さ
れた。Effective electrode, membrane area: 3.276m2 current density
: 3.5KA/m” operating temperature
: 85~90℃ Cathode chamber caustic soda concentration: 32~33
wt% anode room salt water concentration: 205±10g/J!
After the operation was stopped, the cation exchange membrane, gasket, and anode chamber frame flange surface were inspected. Corrosion and thinning were observed all around the inner circumference of the gasket used on the anode chamber side, with the largest thinning being 11 mm. In the cation exchange membrane in contact with the thinned part of the gasket, blistering was observed locally, and fine pinholes were found in some areas.
一方、陽極室枠フランジ面に貼り付けたＰＴＦＥシート
を取り除いて点検したが、フランジ面には表面変化や腐
食及び減肉は全く見られなかった。On the other hand, the PTFE sheet attached to the flange surface of the anode chamber frame was removed and inspected, but no surface change, corrosion, or thinning was observed on the flange surface.
この様に、ＰＴＦＥシートの介在により、陽極室枠のフ
ランジ面の腐食が防止出来た。In this way, the presence of the PTFE sheet prevented corrosion of the flange surface of the anode chamber frame.
比較例、１
陽極室枠フランジ面にＰＴＦＥ製シートを貼り付けずに
実施例、１と同様の条件下で塩化ナトリウム水溶液の電
解を２４ケ月運転した。運転停止後、陽イオン交換膜、
ガスケット及び陽極室枠フランジ面について点検を行っ
た。陽極室枠フランジ面を詳細に調査した所、内周端部
より外周側５■迄のフランジ面において局部的に腐食及
び減肉が見られた。ある所では、巾２ｍｍ、長さ４ｍｍ
。Comparative Example 1 Electrolysis of a sodium chloride aqueous solution was operated for 24 months under the same conditions as in Example 1 without attaching a PTFE sheet to the flange surface of the anode chamber frame. After stopping operation, cation exchange membrane,
The gasket and anode chamber frame flange surface were inspected. When the flange surface of the anode chamber frame was examined in detail, localized corrosion and thinning were observed on the flange surface from the inner circumferential end to the outer circumference up to 5 inches. In some places, it is 2mm wide and 4mm long.
.
深さＱ、 ２ｍｍの減肉が見られ、又、あるところで
は巾３ｍｍ、長さ１５ｍｍに亘り、陽イオン交模膜の補
強材を投影した如き格子状の線状腐食が見られた。これ
ら陽極室枠フランジ面の腐食場所に相当するガスケット
及び陽イオン交換膜に於いて、ガスケットは腐食及び減
肉して一部欠落しており、陽イオン交換膜においては、
水泡現象が見られ、一部に微細なピンホールが発見され
た。Thickness loss of 2 mm in depth Q was observed, and in some places, linear corrosion in a lattice shape, which looked like a projection of the reinforcing material of the cationic exchange membrane, was observed over a width of 3 mm and a length of 15 mm. In the gasket and cation exchange membrane corresponding to the corroded areas on the flange surface of the anode chamber frame, some parts of the gasket are missing due to corrosion and thinning, and in the cation exchange membrane,
Blisters were observed, and minute pinholes were found in some areas.
［本発明の効果］
本発明の塩化アルカリ水溶液の電解槽は、陽極室枠フラ
ンジ内周部のガスケットの腐食及び減肉、更には陽イオ
ン交換膜の損傷によって引き起こされる陽極室枠フラン
ジ面の腐食及び減肉などのトラブルもなく、長期間に亘
り安定した電解操業を継続させることが可能となり、そ
の経済的効果も極めて顕著となる。[Effects of the present invention] The electrolytic cell for an aqueous alkali chloride solution of the present invention prevents corrosion and thinning of the gasket on the inner circumference of the anode chamber frame flange, as well as corrosion of the anode chamber frame flange surface caused by damage to the cation exchange membrane. Moreover, it becomes possible to continue stable electrolytic operation for a long period of time without problems such as thinning, and the economic effects thereof are also extremely significant.
第１図は本発明のフィルタープレス型イオン交模膜法電
解槽に於ける、陽極室枠フランジ部のシール部分の一実
施態様を示す断面図である。
第１図FIG. 1 is a sectional view showing an embodiment of the sealing portion of the anode chamber frame flange in the filter press type ion exchange membrane method electrolytic cell of the present invention. Figure 1
Claims (1)
有するガスケットを配し陽イオン交換膜を締め付けてな
る塩化アルカリ水溶液を電気分解するための電解槽おい
て、陽極室枠フランジ面とガスケットとの間にフッ素系
樹脂シートが介在していることを特徴とする電解槽。1) In an electrolytic cell for electrolyzing an aqueous alkali chloride solution, the flange surface of the anode chamber frame and An electrolytic cell characterized by having a fluororesin sheet interposed between the gasket and the gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2276447A JPH04154980A (en) | 1990-10-17 | 1990-10-17 | Electrolytic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2276447A JPH04154980A (en) | 1990-10-17 | 1990-10-17 | Electrolytic cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04154980A true JPH04154980A (en) | 1992-05-27 |
Family
ID=17569560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2276447A Pending JPH04154980A (en) | 1990-10-17 | 1990-10-17 | Electrolytic cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04154980A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2018139613A1 (en) * | 2017-01-26 | 2019-07-11 | 旭化成株式会社 | Bipolar element, Bipolar electrolytic cell, Hydrogen production method |
| WO2023106412A1 (en) * | 2021-12-10 | 2023-06-15 | 株式会社トクヤマ | Electrolytic cell for alkaline water electrolysis |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6296689A (en) * | 1985-10-08 | 1987-05-06 | Asahi Glass Co Ltd | Sealing method for ion exchange membrane |
| JPH0356691A (en) * | 1989-05-09 | 1991-03-12 | Dow Chem Co:The | Preventing gap of titanium from corrosion |
-
1990
- 1990-10-17 JP JP2276447A patent/JPH04154980A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6296689A (en) * | 1985-10-08 | 1987-05-06 | Asahi Glass Co Ltd | Sealing method for ion exchange membrane |
| JPH0356691A (en) * | 1989-05-09 | 1991-03-12 | Dow Chem Co:The | Preventing gap of titanium from corrosion |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2018139613A1 (en) * | 2017-01-26 | 2019-07-11 | 旭化成株式会社 | Bipolar element, Bipolar electrolytic cell, Hydrogen production method |
| WO2023106412A1 (en) * | 2021-12-10 | 2023-06-15 | 株式会社トクヤマ | Electrolytic cell for alkaline water electrolysis |
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