Wholesale China Mekp Catalyst For Polyester Resin Companies Factory - Weak base anion exchange resin – Dongli

Strong Base Anion Resins

Impurity Removal
The industrial products of ion exchange resin often contain a small amount of low polymer and non reactive monomer, 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 into the solution, affecting the quality of effluent water. Therefore, the new resin must be pretreated before use. Generally, water is used to make the resin fully expand, and then, The inorganic impurities (mainly iron compounds) can be removed by 4-5% dilute hydrochloric acid, and the organic impurities can be removed by 2-4% dilute sodium hydroxide solution. If it is used in pharmaceutical preparation, it must be soaked in ethanol.

Periodic Activation Treatment
In the use of resin, it is necessary to prevent contact with oil pollution, organic molecular microorganism, strong oxidant and other metals (such as iron, copper, etc.) so as to avoid reducing ion exchange capacity or even losing function. Therefore, the resin must be activated irregularly according to the situation. The activation method can be determined according to the pollution condition and conditions. Generally, the cation resin is easy to be polluted by Fe in softening by hydrochloric acid immersion, Then dilute gradually, the anion resin is easy to be polluted by organic matter. It can be soaked or washed with 10% NaCl + 2-5% NaOH mixed solution. If necessary, it can be soaked in 1% hydrogen peroxide solution for several minutes. Other, can also use acid-base alternate treatment, bleaching treatment, alcohol treatment and various sterilization methods.

New Resin Pretreatment
Pretreatment of new resin: in industrial products of ion exchange resin, there are 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 contacts water, acid, alkali or other solution, the above substances will be transferred into the solution, which will affect the quality of the effluent. Therefore, the new resin must be pre treated before use. Generally, the resin will expand with water, and then the inorganic impurities (mainly iron compounds) can be removed by 4-5% dilute hydrochloric acid, and the organic impurities can be removed by 2-4% dilute sodium hydroxide solution to be washed to near neutral.