What should be paid attention to in ion exchange resin pretreatment?

　　Industrial products of ion exchange resins often contain a small amount of oligomers and non-reactive monomers, as well as inorganic impurities such as iron, lead and copper. When the resin is in contact with water, acid, alkali or other solutions, the above substances will be transferred to the solution, affecting the quality of the effluent. Therefore, the new resin must be pretreated before use. Generally, the resin is expanded with water, then the inorganic impurities (mainly iron compounds) are removed with 4-5% dilute hydrochloric acid, and then the organic impurities are washed to near neutrality with 2-4% dilute sodium hydroxide solution.

　　Water treatment resins are used to prevent contact with metals such as iron and copper. Oil contamination, organic molecular microorganisms, strong oxidants, etc. to avoid the reduction of ion exchange capacity. Therefore, the resin must be activated irregularly according to the situation. The activation method can be determined according to the pollution conditions and conditions. In general, the positive resin is susceptible to iron pollution during softening process. It can be soaked in hydrochloric acid and then diluted gradually. Anionic resins are easily contaminated by organic matter. It can be immersed or eluted in 10% NaCl+2-5% NaOH mixed solution. If necessary, 1% hydrogen peroxide solution can be immersed for several minutes. Other resins can be treated by acid-base alternation and bleaching. Alcohol treatment and various disinfection methods. Pretreatment of New Resin

　　The industrial products of ion exchange resins contain a small amount of oligomers and non-reactive monomers, as well as inorganic impurities such as iron, lead and copper. 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. When the resin is in contact with water, acid, alkali or other solutions, the above substances will be transferred to the solution, affecting the quality of the effluent. Therefore, the new resin must be pretreated before use. Inorganic impurities (mainly iron compounds) can be removed by 4-5% dilute hydrochloric acid, and organic impurities can be removed by 2-4% dilute sodium hydroxide solution and washed to near neutral. If used in the preparation of drugs, ethanol treatment is applied.

　　4. (Storage and transportation in winter should be kept in the temperature environment of 5-40 degrees Celsius to avoid supercooling or overheating, which will affect the quality. 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. If there is no insulation equipment in winter, the resin can be stored in brine, and the concentration of brine can be determined according to the temperature.

　　5: Ion exchange resin contains a certain amount of water and should not be stored in the open air. 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. During storage and transportation, the resin should be kept moist to avoid dry dehydration, such as resin dehydration during storage, soaking in concentrated brine (10%) and then gradually diluting, not directly into the water, in order to avoid rapid expansion and fracture of the resin.