Cation Exchange Resin Manufacturers Remind Resin Storage in Winter

Most cation exchange resins contain acidic groups such as sulfonic acid (-SO3H), carboxyl (-COOH) or phenol (-C6H4OH), which can exchange hydrogen ions with metal ions or other cations in solution. For example, the sulfonation of styrene and divinylbenzene polymers can obtain a strong acidic cation exchange resin, its structural formula can be simply expressed as R-SO3H, where R represents the resin matrix, the basic principle of exchange is 2R-SO3H +Ca2+ - (R-SO3) 2Ca+2H+, which is also the basic principle of hard water softening.

In use, the cation exchange resin should avoid contact with metal (such as iron, copper, etc.) oil, organic molecular microorganisms, strong oxidants, etc., so that the ion exchange capacity is greatly reduced, or even lost function, therefore, the resin should be activated irregularly according to the situation, and the activation method can be determined according to the pollution situation and conditions. Generally speaking, Yang resin is susceptible to Fe contamination in softening and can be soaked with hydrochloric acid and then gradually diluted, while Yin resin is susceptible to organic matter pollution. It can be soaked or washed with 10%NaC1+2-5%NaOH mixed solution. If necessary, 1% hydrogen peroxide solution can be soaked for a few minutes. Alcohol treatment and various sterilization methods, etc.

In addition, the cation exchange resin in the cold winter storage and transportation should be kept in a temperature environment of 5-40 ° C, to avoid excessive cold or overheating, affecting the quality of the product, if there is no insulation equipment in the cold winter, the resin can be stored in salt water, salt water concentration can be determined according to the temperature.

The industrial products of cation exchange resins often contain a small amount of oligomers and monomers that do not participate in the reaction, and also contain 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 into the solution, affecting the quality of the aquatic product. Therefore, the new resin must be pre-treated before use. Generally speaking, the resin is expanded with water first, and then, the inorganic impurities (mainly iron compounds) can be selected to remove 4-5% diluted hydrochloric acid, and the organic impurities can be selected to remove 2-4% dilute sodium hydroxide solution to nearly neutral.