JPH0978276A - Refining method of alkali solution - Google Patents
Refining method of alkali solutionInfo
- Publication number
- JPH0978276A JPH0978276A JP7264904A JP26490495A JPH0978276A JP H0978276 A JPH0978276 A JP H0978276A JP 7264904 A JP7264904 A JP 7264904A JP 26490495 A JP26490495 A JP 26490495A JP H0978276 A JPH0978276 A JP H0978276A
- Authority
- JP
- Japan
- Prior art keywords
- sodium hydroxide
- cathode chamber
- hydroxide solution
- chamber
- cathode
- 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.)
- Granted
Links
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルカリ溶液の精
製方法に関する。TECHNICAL FIELD The present invention relates to a method for purifying an alkaline solution.
【０００２】[0002]
【従来の技術】例えば塩化ナトリウム等の食塩水を電気
分解して水酸化ナトリウム溶液（ＮａＯＨ）を製造する
方法の１つにイオン交換膜法がある。この方法は、陽極
室と陰極室とを陽イオン交換膜で区画した電解槽内にて
実施される。即ち、ｐＨが２程度の酸性状態にある食塩
水を陽極室に注入し、陽極にて以下の（１）式に示す塩
素（Ｃｌ2 ）発生反応を進行させると共に、陽極室に存
在するナトリウムイオン（Ｎａ+ ）を陽イオン交換膜を
介して陽極室から陰極室へ通過させ、陰極室において以
下の（２）式に示す水酸化ナトリウムの生成反応を進行
させるものである。 ２Ｃｌ- → Ｃｌ2 ＋２ｅ …（１） ２Ｎａ+ ＋２Ｈ2 Ｏ＋２ｅ → ２ＮａＯＨ＋Ｈ2 …（２）2. Description of the Related Art An ion exchange membrane method is one of the methods for producing a sodium hydroxide solution (NaOH) by electrolyzing a saline solution such as sodium chloride. This method is carried out in an electrolytic cell in which the anode chamber and the cathode chamber are partitioned by a cation exchange membrane. That is, a salt solution in an acidic state having a pH of about 2 is injected into the anode chamber, the chlorine (Cl 2 ) generation reaction shown in the following formula (1) is advanced at the anode, and sodium ions existing in the anode chamber are (Na + ) is passed from the anode chamber to the cathode chamber through the cation exchange membrane, and the sodium hydroxide production reaction represented by the following formula (2) is allowed to proceed in the cathode chamber. 2Cl - → Cl 2 + 2e ... (1) 2Na + + 2H 2 O + 2e → 2NaOH + H 2 ... (2)
【０００３】[0003]
【発明が解決しようとする課題】ここで上述の方法で製
造した水酸化ナトリウム溶液には、例えば金属イオンや
水酸化物等の不純物が数ｐｐｍ程度存在する。この理由
については次のように推察される。即ち原料となる食塩
水には鉄（Ｆｅ）、ニッケル（Ｎｉ）、マグネシウム
（Ｍｇ）やカルシウム（Ｃａ）等の金属が不純物として
含まれており、これらの金属は酸性雰囲気である陽極室
では陽イオンとして存在する。このためこれらの金属も
ナトリウムイオンと共に陽イオン交換膜を通過して陰極
室に侵入し、アルカリ性雰囲気である陰極室にて、金属
は水酸化物として沈殿したり、イオンあるいは酸素と結
びついて陰イオンとして存在する。従って陰極室にて得
られる水酸化ナトリウム溶液にはこれらが不純物として
存在することとなる。The sodium hydroxide solution produced by the above-mentioned method contains impurities such as metal ions and hydroxide in the order of several ppm. The reason for this is presumed as follows. That is, the salt solution as a raw material contains metals such as iron (Fe), nickel (Ni), magnesium (Mg), and calcium (Ca) as impurities, and these metals are positive in an acidic atmosphere in the anode chamber. It exists as an ion. Therefore, these metals also penetrate into the cathode chamber through the cation exchange membrane along with sodium ions, and in the cathode chamber, which is an alkaline atmosphere, the metal precipitates as hydroxides or combines with ions or oxygen to form anions. Exists as. Therefore, these are present as impurities in the sodium hydroxide solution obtained in the cathode chamber.
【０００４】ところで最近産業の高度化やファイン化が
進行しつつあり、これに伴い水酸化ナトリウム溶液の不
純物の許容量が低下し、不純物濃度が５０ｐｐｂ以下程
度の水酸化ナトリウム溶液が要求されつつある。ここで
従来は電気分解を行う前に原料となる食塩を精製するこ
とにより不純物を除去する方法が採られているが、上述
の水酸化ナトリウム溶液の製造方法では食塩に含まれて
いる不純物がそのまま水酸化ナトリウム溶液に存在する
こととなるため、水酸化ナトリウム溶液の不純物濃度に
応じて食塩の精製度を変える必要がある。従って不純物
濃度の極めて低い水酸化ナトリウム溶液を得るために
は、食塩の精製度をかなり高める必要があり、食塩の精
製に時間と手間がかかり面倒であると共に、その分コス
トが高くなるという問題があった。また電解槽や配管か
ら溶出して水酸化ナトリウム溶液中に存在する不純物も
あった。By the way, recently, the industrialization is becoming more sophisticated and finer, and along with this, the permissible amount of impurities in the sodium hydroxide solution is decreasing, and a sodium hydroxide solution having an impurity concentration of about 50 ppb or less is being demanded. . Here, conventionally, a method of removing impurities by refining salt as a raw material before performing electrolysis has been adopted, but in the above-described method for producing a sodium hydroxide solution, impurities contained in the salt remain unchanged. Since it exists in the sodium hydroxide solution, it is necessary to change the degree of purification of the salt according to the impurity concentration of the sodium hydroxide solution. Therefore, in order to obtain a sodium hydroxide solution having an extremely low impurity concentration, it is necessary to considerably improve the degree of purification of sodium chloride, and it takes time and labor to purify the sodium chloride, which is troublesome, and the cost increases accordingly. there were. In addition, some impurities were eluted from the electrolytic cell or piping and existed in the sodium hydroxide solution.
【０００５】本発明はこのような事情の下になされたも
のであり、その目的は、不純物濃度の極めて低いアルカ
リ溶液を得ることができるアルカリ溶液の精製方法を提
供することにある。The present invention has been made under such circumstances, and an object thereof is to provide a method for purifying an alkaline solution capable of obtaining an alkaline solution having an extremely low impurity concentration.
【０００６】[0006]
【課題を解決するための手段】本発明は、陽イオン交換
膜により陽極室と陰極室とに区画された電解槽におい
て、前記陽極室に不純物濃度の高いアルカリ溶液を供給
する工程と、前記陰極室に水を供給する工程と、前記電
解槽において電気分解を行なう工程と、を含み、前記陽
極室から前記陽イオン交換膜を介して金属の陽イオンを
前記陰極室に通過させ、当該陰極室において前記電気分
解反応によりこの金属の陽イオンの水酸化物を生成し、
当該水酸化物を水に溶解させることにより、不純物濃度
の低いアルカリ溶液を生成することを特徴とする。According to the present invention, in an electrolytic cell divided into an anode chamber and a cathode chamber by a cation exchange membrane, a step of supplying an alkaline solution having a high impurity concentration to the anode chamber, and the cathode. A step of supplying water to the chamber, and a step of performing electrolysis in the electrolytic cell, wherein metal cations are passed from the anode chamber through the cation exchange membrane to the cathode chamber, In the electrolysis reaction to produce a hydroxide of the cation of this metal,
It is characterized in that an alkaline solution having a low impurity concentration is produced by dissolving the hydroxide in water.
【０００７】例えばアルカリ溶液として水酸化ナトリウ
ム溶液を精製する場合には、陽極室に不純物濃度の高い
水酸化ナトリウム溶液を供給し、陰極室に水を供給して
電気分解を行う。ここで陽極室には金属の陽イオンであ
るナトリウムイオン（Ｎａ＋）と、水酸化物イオン（Ｏ
Ｈ−）と、不純物である金属が存在するが、不純物であ
る金属はアルカリ性雰囲気中では陰イオンとして存在す
るか水酸化物となって沈殿する。このため陽極室におけ
る陽イオンはナトリウムイオンのみであり、このナトリ
ウムイオンのみが陽イオン交換膜を介して陰極室に通過
する。陰極室では電気分解によりナトリウムの水酸化物
である水酸化ナトリウムが生成され、この水酸化ナトリ
ウムが水に溶解して水酸化ナトリウム溶液が生成される
が、陰極室には不純物が入り込まないので得られる水酸
化ナトリウム溶液は不純物濃度の極めて低いものとな
る。For example, when a sodium hydroxide solution is purified as an alkaline solution, a sodium hydroxide solution having a high impurity concentration is supplied to the anode chamber and water is supplied to the cathode chamber to perform electrolysis. Here, in the anode chamber, sodium ions (Na + ) which are metal cations and hydroxide ions (O 2
H − ) and a metal as an impurity exist, but the metal as an impurity exists as an anion or precipitates as a hydroxide in an alkaline atmosphere. Therefore, the cations in the anode chamber are only sodium ions, and only these sodium ions pass through the cation exchange membrane to the cathode chamber. In the cathode chamber, sodium hydroxide, which is a hydroxide of sodium, is generated by electrolysis, and this sodium hydroxide is dissolved in water to form a sodium hydroxide solution, but it is obtained because impurities do not enter the cathode chamber. The sodium hydroxide solution obtained has an extremely low impurity concentration.
【０００８】[0008]
【発明の実施の形態】次に本発明方法の実施の形態につ
いて説明する。図１は本発明方法を実施する電解槽１を
示すものである。図中１１は陽極室、１２は陰極室であ
り、両者は陽イオン交換膜２により区画されている。３
１は例えば白金ネットからなる陽極、３２は同じく白金
ネットからなる陰極であり、両者は直流電源４に接続さ
れている。電極としては、この他にニッケル板等を用い
ることができる。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the method of the present invention will be described. FIG. 1 shows an electrolytic cell 1 for carrying out the method of the present invention. In the figure, 11 is an anode chamber and 12 is a cathode chamber, both of which are partitioned by the cation exchange membrane 2. 3
Reference numeral 1 is an anode made of, for example, a platinum net, and 32 is a cathode made of a platinum net, both of which are connected to a DC power supply 4. In addition to this, a nickel plate or the like can be used as the electrode.
【０００９】また図中１１ａは不純物を含む粗製水酸化
ナトリウム溶液を陽極室１１に注入するための供給管、
１１ｂは陽極室１１内の溶液を排出するための排出管、
１１ｃは陽極３１での電極反応により発生する酸素（Ｏ
2 ）ガスを排気するための排気管であり、１２ａは陰極
室１２に水を注入するための供給管、１２ｂは陰極室１
２内にて生成された高純度水酸化ナトリウム溶液を排出
するための排出管、１２ｃは陰極３２での電極反応によ
り発生する水素（Ｈ2 ）ガスを排気するための排気管で
ある。Ｖ１〜Ｖ４はバルブである。In the figure, 11a is a supply pipe for injecting a crude sodium hydroxide solution containing impurities into the anode chamber 11.
11b is a discharge pipe for discharging the solution in the anode chamber 11,
11c is oxygen (O) generated by the electrode reaction at the anode 31.
2 ) An exhaust pipe for exhausting gas, 12a is a supply pipe for injecting water into the cathode chamber 12, and 12b is a cathode chamber 1.
An exhaust pipe for exhausting the high-purity sodium hydroxide solution generated in 2 and an exhaust pipe 12c for exhausting hydrogen (H 2 ) gas generated by the electrode reaction at the cathode 32. V1 to V4 are valves.
【００１０】本発明方法はこのような電解槽１におい
て、先ず陽極室１１に例えばＦｅ、Ｎｉ、Ｍｇ、Ｃａ等
の不純物を含む粗製水酸化ナトリウム溶液を供給管１１
ａを介して注入すると共に、陰極室１２に水例えば超純
水を供給管１２ａを介して注入して電気分解を行うこと
により実施される。In the electrolytic cell 1 according to the method of the present invention, a crude sodium hydroxide solution containing impurities such as Fe, Ni, Mg, and Ca is first supplied to an anode chamber 11 in a supply pipe 11.
It is carried out by injecting water through a and simultaneously injecting water, for example, ultrapure water into the cathode chamber 12 through the supply pipe 12a to perform electrolysis.
【００１１】即ち陽極室１１では、水酸化ナトリウム溶
液はＮａ+ とＯＨ- （水酸化物イオン）の状態で存在
し、このうちＮａ+ は陽イオン交換膜２を通過して陰極
室１２に浸入していく。一方ＯＨ- は陽イオン交換膜２
を通過できないため陽極室１１に存在し、陽極室１１に
て進行する以下の（３）式に示す電解反応に用いられ
る。そしてこの反応により発生する酸素ガスは排気管１
１ｃを介して排気される。 ４ＯＨ- → ２Ｈ2 Ｏ＋Ｏ2 ＋４ｅ …（３）That is, in the anode chamber 11, the sodium hydroxide solution exists in the state of Na + and OH − (hydroxide ion), of which Na + enters the cathode chamber 12 through the cation exchange membrane 2. I will do it. On the other hand, OH - is a cation exchange membrane 2
Is used in the electrolytic reaction shown in the following formula (3), which is present in the anode chamber 11 because it cannot pass through. The oxygen gas generated by this reaction is exhaust pipe 1
Exhausted via 1c. 4OH - → 2H 2 O + O 2 + 4e ... (3)
【００１２】一方陰極室１２では以下の（４）式に示す
電解反応が進行し、この反応によって水酸化ナトリウム
が生成する。そしてこのように生成された水酸化ナトリ
ウムは超純水に溶解されて高純度水酸化ナトリウム溶液
が生成され、この水酸化ナトリウム溶液は排出管１２ｂ
を介して取り出される。また電解反応により発生した水
素ガスは排気管１２ｃを介して排気される。 ４Ｎａ+ ＋４Ｈ2 Ｏ＋４ｅ → ２Ｈ2 ＋４ＮａＯＨ …（４）On the other hand, in the cathode chamber 12, an electrolytic reaction represented by the following equation (4) proceeds, and this reaction produces sodium hydroxide. The sodium hydroxide produced in this way is dissolved in ultrapure water to produce a high-purity sodium hydroxide solution, and the sodium hydroxide solution is discharged from the discharge pipe 12b.
Is taken out through. The hydrogen gas generated by the electrolytic reaction is exhausted through the exhaust pipe 12c. 4Na + + 4H 2 O + 4e → 2H 2 + 4NaOH (4)
【００１３】このような方法では、Ｆｅ、Ｎｉ、Ｍｇ、
Ｃａ等の不純物を含む水酸化ナトリウム溶液を陽極室１
１に注入すると、水酸化ナトリウム溶液はアルカリ性で
あるため、陽極室１１内では上記不純物である金属は陰
イオンの状態で存在するか、水酸化物の状態で存在す
る。例えばＦｅの場合では、アルカリ性雰囲気では水酸
化ナトリウム溶液中にＨＦｅＯ2 - 、ＦｅＯ4 2-として
存在するか、Ｆｅ（ＯＨ）2 、Ｆｅ（ＯＨ）3 として沈
殿する。従ってこれら不純物である金属は陽イオン交換
膜２を通過できず、陽極室１１に留まることになる。こ
の結果陰極室１２には不純物は入り込まないので、陰極
室１２にて生成される水酸化ナトリウム溶液は不純物濃
度が極めて低いものとなる。In such a method, Fe, Ni, Mg,
Anode chamber 1 containing sodium hydroxide solution containing impurities such as Ca
When injected into No. 1, since the sodium hydroxide solution is alkaline, the metal that is the impurity exists in the anode chamber 11 in the anion state or in the hydroxide state. For example, in the case of Fe, it exists as HFeO 2 − , FeO 4 2− in the sodium hydroxide solution in an alkaline atmosphere, or precipitates as Fe (OH) 2 or Fe (OH) 3 . Therefore, these impurities metals cannot pass through the cation exchange membrane 2 and remain in the anode chamber 11. As a result, impurities do not enter the cathode chamber 12, so that the sodium hydroxide solution produced in the cathode chamber 12 has an extremely low impurity concentration.
【００１４】またこの方法では、得ようとする水酸化ナ
トリウム溶液の濃度は電解反応で生成する水酸化ナトリ
ウム溶液の量と、陰極室１１に供給される超純水の量と
により決定される。従って電流値と電解時間とにより水
酸化ナトリウムの生成量を制御し、一方陰極室１１に供
給する超純水の注入速度の制御により超純水の陰極室１
１内の滞留時間を制御すれば所望の濃度の水酸化ナトリ
ウム溶液を得ることができる。In this method, the concentration of the sodium hydroxide solution to be obtained is determined by the amount of sodium hydroxide solution produced by the electrolytic reaction and the amount of ultrapure water supplied to the cathode chamber 11. Therefore, the production amount of sodium hydroxide is controlled by the current value and the electrolysis time, while the injection rate of the ultrapure water supplied to the cathode chamber 11 is controlled so that the cathode chamber 1 for the ultrapure water is generated.
If the residence time in 1 is controlled, a sodium hydroxide solution having a desired concentration can be obtained.
【００１５】従ってこのようなアルカリ溶液の精製方法
によれば不純物濃度の高い水酸化ナトリウム溶液を精製
して極めて不純物濃度の低い水酸化ナトリウム溶液を得
ることを簡単な手法で確実に行うことができる。従って
精製度が低い食塩を原料として製造した粗製水酸化ナト
リウム溶液を本発明方法によって精製することにより、
不純物濃度を極めて低くすることができる。Therefore, according to such a method for purifying an alkaline solution, it is possible to surely purify a sodium hydroxide solution having a high impurity concentration to obtain a sodium hydroxide solution having an extremely low impurity concentration by a simple method. . Therefore, by refining the crude sodium hydroxide solution produced using low-purity sodium chloride as a raw material by the method of the present invention,
The impurity concentration can be made extremely low.
【００１６】また電解槽等から溶出する不純物について
は、陽極室にて溶出する不純物は上述のように、陽極室
内に陰イオン又は水酸化物の状態で残存するため、精製
後の水酸化ナトリウム溶液に含まれる不純物は陰極室に
て溶出する分のみとなる。従って陰極室にて溶出する量
は電解槽全体から溶出する場合と比べて少なくなるた
め、この点においても不純物濃度は低くなる。Regarding the impurities eluted from the electrolytic cell or the like, the impurities eluted in the anode chamber remain in the anode chamber in the state of anions or hydroxides as described above, so that the purified sodium hydroxide solution is used. The impurities contained in are only the amount eluted in the cathode chamber. Therefore, the amount of elution in the cathode chamber is smaller than that in the case of elution from the entire electrolytic cell, and the impurity concentration is also low in this respect.
【００１７】なお本発明方法を実施するにあたっては、
図１に示す単極式の電解槽１のみならず、例えば図２に
示すような複極式の電解槽５を用いるようにしてもよ
い。この電解槽５は例えば２枚の陽イオン交換膜５１、
５２により槽５を陰極室５３と、この両側に設けられた
陽極室５４、５５との３つの室に区画して構成される。
またこの図において、５６は陰極、５７、５８は陽極で
あり、供給管、排気管、排出管は省略して示してある。
このような電解槽５では、陽極室５４、５５に不純物濃
度が高い粗製水酸化ナトリウム溶液が注入され、陰極室
５３にて不純物濃度が低い高純度水酸化ナトリウム溶液
が生成されるが、１回の電気分解により濃度の高い水酸
化ナトリウム溶液を得ることができ、電解槽の設置に要
する面積の有効利用を図ることができる。In carrying out the method of the present invention,
In addition to the monopolar electrolytic cell 1 shown in FIG. 1, for example, a bipolar electrolytic cell 5 as shown in FIG. 2 may be used. The electrolytic cell 5 includes, for example, two cation exchange membranes 51,
The tank 5 is divided by 52 into three chambers, that is, a cathode chamber 53 and anode chambers 54 and 55 provided on both sides of the cathode chamber 53.
Further, in this figure, 56 is a cathode, 57 and 58 are anodes, and supply pipes, exhaust pipes, and discharge pipes are omitted.
In such an electrolytic cell 5, a crude sodium hydroxide solution having a high impurity concentration is injected into the anode chambers 54 and 55, and a high-purity sodium hydroxide solution having a low impurity concentration is generated in the cathode chamber 53. A highly concentrated sodium hydroxide solution can be obtained by the electrolysis of, and the area required for the installation of the electrolytic cell can be effectively utilized.
【００１８】さらに本発明方法は、上述の単極式の電解
槽１や複極式の電解槽５を複数連結した電解槽において
実施してもよいし、その他各種の電解槽において実施す
ることができる。Further, the method of the present invention may be carried out in an electrolytic cell in which a plurality of the above-mentioned single-electrode type electrolytic cell 1 and multiple-electrode type electrolytic cell 5 are connected, or in various other electrolytic cells. it can.
【００１９】さらにまた本発明方法は、水酸化ナトリウ
ム溶液の他、水酸化カリウム溶液、水酸化バリウム溶液
等のアルカリ金属あるいはアルカリ土類金属の水酸化物
からなるアリカリであって可溶性のものの精製に適用す
ることができる。Furthermore, the method of the present invention is applicable to the purification of soluble alkalinity potassium hydroxide solutions, barium hydroxide solutions, and other alkali metal or alkaline earth metal hydroxides in addition to sodium hydroxide solutions. Can be applied.
【００２０】[0020]
【実施例】 （実施例１） 上述の図１に示す電解槽１の陽極室１１
に、不純物として鉄を１．７ｐｐｍ含む３０〜４０％水
酸化ナトリウム溶液を注入し、陰極室１２に超純水を１
０リットル／時の速度で注入しながら、１０アンペアの
電流を通じて１時間電気分解を行った。電圧は水酸化ナ
トリウム生成に必要な理論分解電圧１．３ボルトの２倍
以上の値を用いた。陰極室１２にて得られた水酸化ナト
リウム溶液は濃度が１３％、不純物濃度が３０ｐｐｂ以
下であった。 （実施例２） 実施例１と同様の操作を、陰極室１２に
て得られる水酸化ナトリウム溶液の１部例えば４／５量
を循環させながら行ったところ、濃度が３７％、不純物
濃度が３０ｐｐｂ以下の水酸化ナトリウム溶液が得られ
た。 （実施例３） 実施例１の操作を、陰極室１２への超純
水の注入速度を３リットル／時に設定し、１０００アン
ペアの電流を通じて行ったところ、濃度が３９％、不純
物濃度が３０ｐｐｂ以下の水酸化ナトリウム溶液が得ら
れた。EXAMPLES Example 1 Anode chamber 11 of electrolytic cell 1 shown in FIG. 1 described above.
A 30 to 40% sodium hydroxide solution containing 1.7 ppm of iron as an impurity is injected into the cathode chamber, and ultrapure water is added to the cathode chamber 12 in an amount of 1%.
Electrolysis was carried out for 1 hour with a current of 10 amps while injecting at a rate of 0 liters / hour. As the voltage, a value twice or more of the theoretical decomposition voltage of 1.3 V required for producing sodium hydroxide was used. The sodium hydroxide solution obtained in the cathode chamber 12 had a concentration of 13% and an impurity concentration of 30 ppb or less. (Example 2) The same operation as in Example 1 was performed while circulating 1 part of the sodium hydroxide solution obtained in the cathode chamber 12, for example, 4/5, and the concentration was 37% and the impurity concentration was 30 ppb. The following sodium hydroxide solution was obtained. (Example 3) The operation of Example 1 was carried out while setting the injection rate of ultrapure water into the cathode chamber 12 at 3 liters / hour and applying a current of 1000 amperes. To give a sodium hydroxide solution.
【００２１】[0021]
【発明の効果】 陽イオン交換膜により陽極室と陰極室
とに区画された電解槽において、陽極室に不純物濃度の
高いアルカリ溶液を供給し、陰極室に水を供給して電気
分解を行なうと、陽極室に存在する不純物は陽イオン交
換膜を通過できないため、陰極室において極めて不純物
濃度の低いアルカリ溶液を生成することができる。EFFECT OF THE INVENTION In an electrolytic cell divided into an anode chamber and a cathode chamber by a cation exchange membrane, an alkaline solution having a high impurity concentration is supplied to the anode chamber and water is supplied to the cathode chamber to perform electrolysis. Since impurities existing in the anode chamber cannot pass through the cation exchange membrane, it is possible to generate an alkaline solution having an extremely low impurity concentration in the cathode chamber.
【図１】本発明方法を実施するための電解槽を示す断面
図である。FIG. 1 is a cross-sectional view showing an electrolytic cell for carrying out the method of the present invention.
【図２】本発明方法を実施するための電解槽の他の例を
示す断面図である。FIG. 2 is a sectional view showing another example of an electrolytic cell for carrying out the method of the present invention.
１、５ 電解槽 １１、５４、５５ 陽極室 １２、５３ 陰極室 ２、５１、５２ 陽イオン交換膜 ３１、５７、５８ 陽極 ３２、５６ 陰極 1, 5 Electrolyzer 11, 54, 55 Anode chamber 12, 53 Cathode chamber 2, 51, 52 Cation exchange membrane 31, 57, 58 Anode 32, 56 Cathode
Claims (1)
に区画された電解槽において、前記陽極室に不純物濃度
の高いアルカリ溶液を供給する工程と、 前記陰極室に水を供給する工程と、 前記電解槽において電気分解を行なう工程と、を含み、 前記陽極室から前記陽イオン交換膜を介して金属の陽イ
オンを前記陰極室に通過させ、当該陰極室において前記
電気分解反応によりこの金属の陽イオンの水酸化物を生
成し、当該水酸化物を水に溶解させることにより、不純
物濃度の低いアルカリ溶液を生成することを特徴とする
アルカリ溶液の精製方法。1. A step of supplying an alkaline solution having a high impurity concentration to the anode chamber and a step of supplying water to the cathode chamber in an electrolytic cell divided into an anode chamber and a cathode chamber by a cation exchange membrane. And a step of performing electrolysis in the electrolytic cell, wherein cations of the metal are passed from the anode chamber to the cathode chamber through the cation exchange membrane, and the metal is formed by the electrolysis reaction in the cathode chamber. A method for purifying an alkaline solution, which comprises producing a hydroxide of a cation and dissolving the hydroxide in water to produce an alkaline solution having a low impurity concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26490495A JP3380658B2 (en) | 1995-09-19 | 1995-09-19 | Purification method of alkaline solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26490495A JP3380658B2 (en) | 1995-09-19 | 1995-09-19 | Purification method of alkaline solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0978276A true JPH0978276A (en) | 1997-03-25 |
| JP3380658B2 JP3380658B2 (en) | 2003-02-24 |
Family
ID=17409837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26490495A Expired - Lifetime JP3380658B2 (en) | 1995-09-19 | 1995-09-19 | Purification method of alkaline solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3380658B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1168423A1 (en) * | 1999-12-28 | 2002-01-02 | Shin-Etsu Handotai Co., Ltd | Etching solution, etching method, and semiconductor silicon wafer |
| DE10217096B4 (en) * | 2001-04-18 | 2006-03-09 | Tsurumi Soda Co., Ltd., Yokohama | Apparatus and method for purifying alkaline solution |
| JP2007138233A (en) * | 2005-11-17 | 2007-06-07 | Toagosei Co Ltd | Method of manufacturing high purity alkaline metal hydroxide |
| US7288206B2 (en) | 2003-12-22 | 2007-10-30 | Siltronic Ag | High-purity alkali etching solution for silicon wafers and use thereof |
| JP2010234297A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Method of regenerating ion exchange resin and ultrapure water producing apparatus |
| JP2010260758A (en) * | 2009-05-01 | 2010-11-18 | Tsurumi Soda Co Ltd | Sodium hydroxide aqueous solution reduced in potassium content, solid-shaped sodium hydroxide and method for producing them |
| JP2014121709A (en) * | 2014-03-31 | 2014-07-03 | Kurita Water Ind Ltd | Method for preventing ion exchange resin from being contaminated with boron |
| CZ305048B6 (en) * | 2014-01-21 | 2015-04-08 | Vysoká škola chemicko- technologická v Praze | Refining hydroxides using membrane electrolysis method with iron electrode |
| KR102025559B1 (en) * | 2018-12-20 | 2019-09-26 | (주) 테크로스 | Method for treating ballast water and marine exhaust gas using electrolysis |
| CN114008848A (en) * | 2019-06-14 | 2022-02-01 | 罗兰大学 | Polypropylene-or polyethylene-based separator for use in electrochemical cells for the production of alkali metal ferrate |
-
1995
- 1995-09-19 JP JP26490495A patent/JP3380658B2/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1168423A1 (en) * | 1999-12-28 | 2002-01-02 | Shin-Etsu Handotai Co., Ltd | Etching solution, etching method, and semiconductor silicon wafer |
| EP1168423A4 (en) * | 1999-12-28 | 2007-01-24 | Shinetsu Handotai Kk | Etching solution, etching method, and semiconductor silicon wafer |
| DE10217096B4 (en) * | 2001-04-18 | 2006-03-09 | Tsurumi Soda Co., Ltd., Yokohama | Apparatus and method for purifying alkaline solution |
| US7288206B2 (en) | 2003-12-22 | 2007-10-30 | Siltronic Ag | High-purity alkali etching solution for silicon wafers and use thereof |
| JP2007138233A (en) * | 2005-11-17 | 2007-06-07 | Toagosei Co Ltd | Method of manufacturing high purity alkaline metal hydroxide |
| JP2010234297A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Method of regenerating ion exchange resin and ultrapure water producing apparatus |
| JP2010260758A (en) * | 2009-05-01 | 2010-11-18 | Tsurumi Soda Co Ltd | Sodium hydroxide aqueous solution reduced in potassium content, solid-shaped sodium hydroxide and method for producing them |
| CZ305048B6 (en) * | 2014-01-21 | 2015-04-08 | Vysoká škola chemicko- technologická v Praze | Refining hydroxides using membrane electrolysis method with iron electrode |
| JP2014121709A (en) * | 2014-03-31 | 2014-07-03 | Kurita Water Ind Ltd | Method for preventing ion exchange resin from being contaminated with boron |
| KR102025559B1 (en) * | 2018-12-20 | 2019-09-26 | (주) 테크로스 | Method for treating ballast water and marine exhaust gas using electrolysis |
| WO2020130222A1 (en) * | 2018-12-20 | 2020-06-25 | (주) 테크로스 | Method for treating ship ballast water and ship exhaust gas by using electrolysis |
| CN114008848A (en) * | 2019-06-14 | 2022-02-01 | 罗兰大学 | Polypropylene-or polyethylene-based separator for use in electrochemical cells for the production of alkali metal ferrate |
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| Publication number | Publication date |
|---|---|
| JP3380658B2 (en) | 2003-02-24 |
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