Anion exchange resin - anion exchange resin

A solid or gel-like synthetic resin with an ammonium salt structure. The anions of the ammonium salt are exchanged with anions in an aqueous solution. Synthetic resins are styrene-based, acrylic-based, etc., and are broadly divided into strong basic anion exchange resins and weak basic anion exchange resins. Strong basic anion exchange resins have ammonium salts in the form of quaternary ammonium salts (-N(CH ₃ ) ₃ (X)), and are generally used with X in the form of hydroxide ions. They exchange with anions in solution and release OH ^- . Weak basic anion exchange resins have a tertiary amine (-N(CH ₃ ) ₂ ) structure, and are generally used in the free base form. Product names include Amberlite and Sumilite. In addition to being used with cation exchange resins to make pure water, they are also used to purify amino acids and organic acids, to decolorize foods such as sugar, to adsorb metal complex anions, and as anion exchange resin preparations for stomach pain and liver dysfunction. Membrane-like ion exchange resins are called ion exchange membranes.

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

アンモニウム塩の構造をもつ固形またはゲル状の合成樹脂．アンモニウム塩の陰イオンは，水溶液中の陰イオンと交換される．合成樹脂はスチレン系，アクリル系などで，強塩基性陰イオン交換樹脂と弱塩基性陰イオン交換樹脂に大別される．強塩基性陰イオン交換樹脂はアンモニウム塩が第四級アンモニウム塩(-N(CH₃)₃(X))になっており，一般にはXを水酸化物イオンの形にして使用する．溶液中の陰イオンと交換し，OH^－を放出する．弱塩基性陰イオン交換樹脂は第三級アミン(-N(CH₃)₂)の構造になっており，一般に遊離塩基形で使用する．商品名としては，アンバーライト，スミライトなどがある．純水をつくるのに陽イオン交換樹脂とともに用いられるほか，アミノ酸・有機酸の精製，砂糖など食品の脱色，金属錯陰イオンの吸着，また医薬品として腹痛，肝機能障害のための陰イオン交換樹脂製剤として用いられる．膜状のイオン交換樹脂はイオン交換膜とよばれる．

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