Characteristics of Ion Exchange Resins

Characteristic of ion exchange resin: Strong acidic resin is chemically stable, resistant to strong acid, strong alkali, oxidant and reducing agent, insoluble in acid, alkali and common organic solvents, and heat resistance is above 100 C. Ion exchange resins can be divided into styrene resin and acrylic resin according to their matrix types. The main properties and types of resins are determined by the types of chemical active groups in resins. Firstly, it can be divided into cationic resins and anionic resins, which can exchange ions with cations and anions in solution respectively. Cationic resins can be divided into strong acidity and weak acidity. Anionic resins can be divided into strong alkalinity and weak alkalinity. The ionization rate of strong acidic resin is not affected by pH value, and the range of pH value of ion exchange is wide. After a period of recycling, the functional groups of the resin can be reduced to their original state by chemical substances. Strong acid resin is regenerated with strong acid. Because of the weak binding force between strong acid resin and H+, it is difficult to regenerate hydrogen type and consume more acid, which is

Weak acid ion exchange resin: Weak acid ion exchange resin is a cationic exchange resin containing carboxyl (-COOH) and phenolic hydroxyl (-C6H4OH). Ion exchange resin is composed of classification name, skeleton (or gene) name and basic name. The pore structure is divided into two types: gel type and large pore type. All macroporous resins with physical pore structure are added "big hole" before the full name. If the classification is acidic, the word "yang" should be added before the name, while the classification is alkaline, and the word "yin" should be added before the name. Such as: macroporous strong acidic styrene cation exchange resin. Among them, carboxyl resin is the most widely used.

Characteristic: The ionization degree of weak acidic groups is greatly affected by the pH value of the solution. Ion exchange resin is composed of classification name, skeleton (or gene) name and basic name. The pore structure is divided into two types: gel type and large pore type. All macroporous resins with physical pore structure are added "big hole" before the full name. If the classification is acidic, the word "yang" should be added before the name, while the classification is alkaline, and the word "yin" should be added before the name. Such as: macroporous strong acidic styrene cation exchange resin. There is almost no exchange reaction in acidic solution, that is, only in the solution of pH 7 has better exchange capacity. The smaller the pH value is, the smaller the ion exchange capacity is. Weak acid resin has strong binding force with H + and is easy to regenerate into hydrogen type with less acid consumption. The overcontamination of cationic exchange resin coagulant is introduced.