イオン交換樹脂

関: ionic exchange resin

WordNet

hand over one and receive another, approximately equivalent; "exchange prisoners"; "exchange employees between branches of the company"
chemical process in which one atom or ion or group changes places with another
reciprocal transfer of equivalent sums of money (especially the currencies of different countries); "he earns his living from the interchange of currency" (同)interchange
the act of changing one thing for another thing; "Adam was promised immortality in exchange for his disobedience"; "there was an interchange of prisoners" (同)interchange
(chess) gaining (or losing) a rook in return for a knight or bishop; "black lost the exchange"
(chess) the capture by both players (usually on consecutive moves) of pieces of equal value; "the endgame began after the exchange of queens"
a workplace for buying and selling; open only to members
the act of giving something in return for something received; "deductible losses on sales or exchanges of property are allowable"
a mutual expression of views (especially an unpleasant one); "they had a bitter exchange"
give to, and receive from, one another; "Would you change places with me?"; "We have been exchanging letters for a year" (同)change, interchange
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules (同)rosin
a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
changed for (replaced by) something different

PrepTutorEJDIC

…‘を'『取り替える』;(…と)…‘を'取り替える《+『名』+『for』+『名』》 / …‘を'『取り交わす』;(人と)…‘を'取り交わす《+『名』+『with』+『名』〈人〉》 / (化幣が)両替される / 〈U〉〈C〉(物の物との)『取り替え』《+『of』+『名』+『for』+『名』》;(相手と物を)『交換すること』《+『of』+『名』(複数)+『with』+『名』〈人〉》 / 〈C〉交換物,取り替え品 / 〈C〉取引所;(電話の)交換局 / 〈U〉両替;為替(かわせ),為替相場 / 〈C〉=employment exchange
樹脂,松やに(ワニスや薬品の製造に使う)
イオン

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/19 18:43:15」(JST)

wiki en

[Wiki en表示]

Ion exchange resin beads

An ion-exchange resin or ion-exchange polymer is an insoluble matrix (or support structure) normally in the form of small (0.5-1 mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate. The beads are typically porous, providing a high surface area. The trapping of ions occurs with concomitant releasing of other ions; thus the process is called ion-exchange. There are multiple types of ion-exchange resin. Most commercial resins are made of polystyrene sulfonate.^[1]

Ion exchange resin beads

Ion-exchange resins are widely used in different separation, purification, and decontamination processes. The most common examples are water softening and water purification. In many cases ion-exchange resins were introduced in such processes as a more flexible alternative to the use of natural or artificial zeolites. Also, ion exchange resins are highly effective in the biodiesel filtration process.

Types of resins

Most typical ion-exchange resins are based on crosslinked polystyrene. The actual ion exchanging sites are introduced after polymerisation. Additionally, in the case of polystyrene, crosslinking is introduced via copolymerisation of styrene and a few percent of divinylbenzene (non-crosslinked polymers are soluble in water). Crosslinking decreases ion-exchange capacity of the resin and prolongs the time needed to accomplish the ion exchange processes but improves the robustness of the resin. Particle size also influences the resin parameters; smaller particles have larger outer surface, but cause larger head loss in the column processes.^[2]

Besides being made as bead-shaped materials, ion exchange resins are produced as membranes. The membranes, which are made of highly cross-linked ion exchange resins that allow passage of ions, but not of water, are used for electrodialysis.

Four main types of ion exchange resins differ in their functional groups:

strongly acidic, typically featuring sulfonic acid groups, e.g. sodium polystyrene sulfonate or polyAMPS.
strongly basic, typically featuring quaternary amino groups, for example, trimethylammonium groups, e.g. polyAPTAC)
weakly acidic, typically featuring carboxylic acid groups.
weakly basic, typically featuring primary, secondary, and/or ternary amino groups, e.g. polyethylene amine.

Specialised ion exchange resins are also known such as chelating resins (iminodiacetic acid, thiourea-based resins, and many others.)

Anion resins and cation resins are the two most common resins used in the ion exchange process. While anion resins attract negatively charged ions, cation resins attract positively charged ions.

Anion Resins

Anion resins may be either strongly or weakly basic. Strongly base anion resins can maintain their positive charge across a wide pH range, whereas weakly base anion resins at high pH.^[3] Weakly basic resins do not maintain their charge at a high pH because they undergo deprotonation.^[3] They do, however, offer excellent mechanical and chemical stability. This, combined with a high rate of ion exchange, make weakly base anion resins well suited for the organic salts.

For anion resins, regeneration typically involves treatment of the resin with a strongly basic solution, e.g. aqueous sodium hydroxide. During regeneration, the regenerant chemical is passed through the resin and trapped negative ions are flushed out, renewing the resins’ exchange capacity.^[4]

Uses

Water softening

In this application, ion-exchange resins are used to replace the magnesium and calcium ions found in hard water with sodium ions. When the resin is fresh, it contains sodium ions at its active sites. When in contact with a solution containing magnesium and calcium ions (but a low concentration of sodium ions), the magnesium and calcium ions preferentially migrate out of solution to the active sites on the resin, being replaced in solution by sodium ions. This process reaches equilibrium with a much lower concentration of magnesium and calcium ions in solution than was started with.

Idealised image of water softening process, involving replacement of calcium ions in water with sodium ions donated by a cation exchange resin.

The resin can be recharged by washing it with a solution containing a high concentration of sodium ions (e.g. it has large amounts of common salt (NaCl) dissolved in it). The calcium and magnesium ions migrate off the resin, being replaced by sodium ions from the solution until a new equilibrium is reached. The salt is used to recharge an ion-exchange resin which itself is used to soften the water.

Water purification

In this application, ion-exchange resins are used to remove poisonous (e.g. copper) and heavy metal (e.g. lead or cadmium) ions from solution, replacing them with more innocuous ions, such as sodium and potassium.

Few ion-exchange resins remove chlorine or organic contaminants from water – this is usually done by using an activated charcoal filter mixed in with the resin. There are some ion-exchange resins that do remove organic ions, such as MIEX (magnetic ion-exchange) resins. Domestic water purification resin is not usually recharged – the resin is discarded when it can no longer be used.

Production of high purity water

Water of highest purity is required for electronics, scientific experiments, production of superconductors, and nuclear industry, among others. Such water is produced using ion-exchange processes or combinations of membrane and ion-exchange methods. Cations are replaced with hydrogen ions using cation-exchange resins; anions are replaced with hydroxyls using anion-exchange resins. The hydrogen ions and hydroxyls recombine producing water molecules. Thus, no ions remain in the produced water. The purification process is usually performed in several steps with "mixed bed ion-exchange columns" at the end of the technological chain.

Ion-exchange in metal separation

A drum of yellowcake

Ion-exchange processes are used to separate and purify metals, including separating uranium from plutonium and other actinides, including thorium; and lanthanum, neodymium, ytterbium, samarium, lutetium, from each other and the other lanthanides. There are two series of rare earth metals, the lanthanides and the actinides. Members of each family have very similar chemical and physical properties. Ion-exchange was for many years the only practical way to separate the rare earths in large quantities. This application was developed in the 1940s by Frank Spedding. Subsequently, solvent extraction has mostly supplanted use of ion exchange resins except for the highest purity products.

A very important case is the PUREX process (plutonium-uranium extraction process) which is used to separate the plutonium and the uranium from the spent fuel products from a nuclear reactor, and to be able to dispose of the waste products. Then, the plutonium and uranium are available for making nuclear-energy materials, such as new reactor fuel and nuclear weapons.

Ion-exchange beads are also an essential component in In-situ leach uranium mining. In-situ recovery involves the extraction of uranium-bearing water (grading as low as .05% U₃O₈) through boreholes. The extracted uranium solution is then filtered through the resin beads. Through an ion exchange process, the resin beads attract uranium from the solution. Uranium loaded resins are then transported to a processing plant, where U₃O₈ is separated from the resin beads and yellowcake is produced. The resin beads can then be returned to the ion exchange facility where they are reused.

The ion-exchange process is also used to separate other sets of very similar chemical elements, such as zirconium and hafnium, which incidentally is also very important for the nuclear industry. Zirconium is practically transparent to free neutrons, used in building reactors, but hafnium is a very strong absorber of neutrons, used in reactor control rods.

Catalysis

In chemistry ion-exchange resins in the acid form are known to catalyze organic reactions. See for instance self-condensation.

Juice purification

Ion-exchange resins are used in the manufacture of fruit juices such as orange and cranberry juice where they are used to remove bitter tasting components and so improve the flavor. This allows tart or poorer tasting fruit sources to be used for juice production.

Sugar manufacturing

Ion-exchange resins are used in the manufacturing of sugar from various sources. They are used to help convert one type of sugar into another type of sugar, and to decolorize and purify sugar syrups.

Pharmaceuticals

Ion-exchange resins are used in the manufacturing of pharmaceuticals, not only for catalyzing certain reactions but also for isolating and purifying pharmaceutical active ingredients. Three ion-exchange resins, sodium polystyrene sulfonate, colestipol, and cholestyramine, are used as active ingredients. Sodium polystyrene sulfonate is a strongly acidic ion-exchange resin and is used to treat hyperkalemia. Colestipol is a weakly basic ion-exchange resin and is used to treat hypercholesterolemia. Cholestyramine is a strongly basic ion-exchange resin and is also used to treat hypercholesterolemia. Colestipol and cholestyramine are known as bile acid sequestrants.

Ion-exchange resins are also used as excipients in pharmaceutical formulations such as tablets, capsules, gums, and suspensions. In these uses the ion-exchange resin can have several different functions, including taste-masking, extended release, tablet disintegration, increased bioavailability, and improving the chemical stability of the active ingredients.

Notes

^ François Dardel and Thomas V. Arden "Ion Exchangers" in Ullmann's Encyclopedia of Industrial Chemistry, 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.a14_393.pub2
^ IUPAC "strongly discourages" the use of the term 'ion-exchange resin' to refer to an ion-exchange polymer, but the usage remains common: International Union of Pure and Applied Chemistry (2004), "Definitions of Terms Relating to Reactions of Polymers and to Functional Polymeric Materials (IUPAC Recommendations 2003)", Pure Appl. Chem. 76 (4): 889–906, doi:10.1351/pac200476040889
^ ^a ^b Grell, Laura. "Proteomics/Protein Separations - Chromatography/Ion exchange". Retrieved October 2013.
^ "Ion Exchange". WaterProfessionals®. Retrieved 2014.

Additional reading

"Ion Exchange Chemistry and Operation". Remco Engineering. Retrieved 2014-05-16.
Friedrich G. Helfferich (1962). Ion Exchange. Courier Dover Publications. ISBN 978-0-486-68784-1.
Ion Exchangers (K. Dorfner, ed.), Walter de Gruyter, Berlin, 1991.
C. E. Harland, Ion exchange: Theory and Practice, The Royal Society of Chemistry, Cambridge, 1994.
Ion exchange (D. Muraviev, V. Gorshkov, A. Warshawsky), M. Dekker, New York, 2000.
A. A. Zagorodni, Ion Exchange Materials: Properties and Applications, Elsevier, Amsterdam, 2006.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 成人における高カリウム血症の治療および予防 treatment and prevention of hyperkalemia in adults
2. 小児における高カリウム血症のマネージメント management of hyperkalemia in children
3. 代謝性アルカローシスの原因 causes of metabolic alkalosis
4. 挫滅関連の急性腎障害（急性腎不全） crush related acute kidney injury acute renal failure
5. 透析患者における消化管疾患 gastrointestinal disease in dialysis patients

English Journal

Novel simple process for tocopherols selective recovery from vegetable oils by adsorption and desorption with an anion-exchange resin.

Hiromori K1, Shibasaki-Kitakawa N2, Nakashima K1, Yonemoto T1.
Food chemistry.Food Chem.2016 Mar 1;194:1-5. doi: 10.1016/j.foodchem.2015.07.137. Epub 2015 Jul 29.
A novel and simple low-temperature process was used to recover tocopherols from a deodorizer distillate, which is a by-product of edible oil refining. The process consists of three operations: the esterification of free fatty acids with a cation-exchange resin catalyst, the adsorption of tocopherols
PMID 26471519

Purification of free arginine from chickpea (Cicer arietinum) seeds.

Cortés-Giraldo I1, Megías C1, Alaiz M1, Girón-Calle J1, Vioque J2.
Food chemistry.Food Chem.2016 Feb 1;192:114-8. doi: 10.1016/j.foodchem.2015.07.001. Epub 2015 Jul 3.
Chickpea is a grain legume widely consumed in the Mediterranean region and other parts of the world. Chickpea seeds are rich in proteins but they also contain a substantial amount of free amino acids, especially arginine. Hence chickpea may represent a useful source of free amino acids for nutrition
PMID 26304327

Chelating resin immobilizing carboxymethylated polyethyleneimine for selective solid-phase extraction of trace elements: Effect of the molecular weight of polyethyleneimine and its carboxymethylation rate.

Kagaya S1, Kajiwara T2, Gemmei-Ide M3, Kamichatani W4, Inoue Y5.
Talanta.Talanta.2016 Jan 15;147:342-50. doi: 10.1016/j.talanta.2015.09.071. Epub 2015 Oct 20.
The effect of the molecular weight of polyethyleneimine (PEI), defined as a compound having two or more ethyleneamine units, and of its carboxymethylation rate (CM/N), represented by the ratio of ion-exchange capacity to the amount of N on the resin, on the selective solid-phase extraction ability o
PMID 26592617

Japanese Journal

Preparation method of barium sulfate from mercuric sulfide for sulfur isotope ratio measurement

Kawano Maya,Tsutsui Akiho,Minami Takeshi
Science and technology = 理工学総合研究所研究報告 (27), 49-54, 2015-02
NAID 40020409531

イオン交換樹脂法によるカルシウム除去技術 (特集最終処分場技術の変遷と今後の展望)

田村典敏,野村幸治,石田泰之
廃棄物資源循環学会誌 = Material cycles and waste management research 26(1), 53-58, 2015
NAID 40020457322

酸素処理プラントへの復水脱塩装置アンモニア型運用の導入評価

鈴木孝,菱田純,中島守,富本五郎
火力原子力発電大会論文集 11(0), 63-69, 2015
現在，酸素処理プラントにおける復水脱塩装置イオン交換樹脂の運用は，水質純度の高い処理水が得られるＨ型運用に限定している。一方，近年の復水脱塩装置再生技術の高度化により，アンモニア型運用時においても高純度水が得られるようになり，酸素処理プラントにアンモニア型運用を導入できる可能性がある。今回，過去の研究実績等も踏まえ，酸素処理プラントにおいてアンモニア型運用実機試験を行ったので，その試験結果等につい …
NAID 130005069330

Related Pictures

★リンクテーブル★

リンク元	「ionic exchange resin」「イオン交換樹脂」
拡張検索	「anion exchange resin」「cation exchange resin」
関連記事	「exchange」「ion」「ION」