Weak Base Anion Resin


Weak Base Anion Resins

Weak base anion exchange resins refer to a type of ion exchange resin with weakly basic groups, such as primary amine groups (also known as primary amine groups) -NH2, secondary amine groups (secondary amine groups) -NHR, or tertiary amine groups (tertiary amine groups) Base)-NR2. They can dissociate from OH- in water and become weakly alkaline. Due to poor dissociation, this resin can only adsorb other anions in the solution under neutral or acidic conditions (such as pH1-9). The weakly basic anion exchange resin can be regenerated with Na2CO3 and NH4OH.


Lactic acid is an important organic acid, and its commercial production mainly depends on microbial fermentation. However, there are two problems in the fermentation process, namely the good control of pH and the recovery process of acid after fermentation. The use of weak base anion exchange resins can get rid of the dependence on lactic acid neutralizers, and is a simple and economical in-situ high-efficiency separation method. The ion exchange adsorption method has high selectivity and high recovery rate.( Zhang, et al., 2018)

Removal of SO2 in industrial flue gas can effectively improve our air conditions and maintain environmental friendliness. The adsorption of SO2 by the citrate method is currently a feasible and efficient new method to solve the problem of desulfurization. When the SO2 content in the solution tends to be saturated, it needs to be desorbed and collected. In the process of SO2 desorption, the solution will be heated to 95-120°C. The H2SO3 formed at this time will inevitably interact with the trace oxygen in the solution to form H2SO4 accordingly. Therefore, it is very important to remove SO42- from the solution, so as to ensure the normal operation of the entire system. A weak base anion exchange resin can be used to remove SO42- in the citrate solution to ensure its good adsorption performance for SO2. Compared with citrate, weak base anion exchange resin has preferential adsorption to SO42- and can effectively remove this impure anion.( Hong T, et al., 2018)

Schematic diagram of the column apparatus for column experiments.Fig. 1. Schematic diagram of the column apparatus for column experiments. ( Chen Y, et al., 2016)

Typical Applications

  • Ion removal and recovery
  • Syrup decolorization
  • Citric Acid Refined
  • Dye intermediate adsorption
  • Extraction of metals from ore pulp


  1. Zhang, et al. Efficient in situ separation and production of L-lactic acid by Bacillus coagulans using weak basic anion-exchange resin[J]. Bioprocess And Biosystems Engineering, 2018.
  2. Hong T, et al. Adsorption and desorption behavior of anion-exchange resin towards SO42− in the desulphurization process using citric method[J]. Adsorption, 2018.

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