Dual Bed Macroporous-type Weak Basic
Polystyrene Anion Exchange Resin


D301DB is a premium-grade weakly basic polystyrene anion exchange resin of chemosynthetic macropores, linking dimethylamino as functional groups, synthesized by special technology.

Due to its high intensity and macropore-structure, excellent regeneration efficiency as well as strong rinse performance, especially its peculiar selectivity towards strong anions, this resin is optimally specialized in removing all the strong acids radicals of the inorganic salts as well as strong negative organic macro-molecules(ie. pigment, odor impurities) within raw water.

Moreover, attributed to its weak-basic feature, this resin is more prone to perform reversible displacement reactions so that organics are easily to be discharged during its regeneration. Thereby it can prevent strong-basic resin from being polluted by those organics when both strength of the resins are configured with one dual-bed exchange column in water treatment system.

This resin model is primarily used in precise anionic dual-bed water treatment system for securing pure and ultrapure water preparation within various industries, mainly applied in de-mineralization, substance refining or de-colorization.

Matrix: Styrene-divinylbenzene copolymer
Functional groups: -N+(CH3 )2
Physical form: Off-white opaque spherical beads
Moisture holding capacity(%): 50 to 60%
Ionic form as shipped: NH3–  form
Total mass exchange capacity: ≥4.8mmol/g
Total bulk exchange capacity: ≥1.4mmol/mL
Moisture true density: 1.03~1.06g/mL
Moisture bulk density: 0.65~0.72g/mL
Effective particle size: 0.40~0.70mm
Particle size: 0.315~1.25mm
Uniformity coefficient: ≤1.6
Integrated beads ratio after grinding test: ≥90℅
Max swelling rate of resin after ionic state transition: NH3 ->Cl : 20%
Maximum operating temperature: 100°C
Minimum bed depth: 700mm
Service flow rate: 5~40 BV/h
Maximum service velocity: 60 m/h
Regenerant: NaOH Na2CO3   NH3H2O
Level(Counted by100%) 50-110g/L 60-140g/L 40~100g/L
Concentration: 2~4℅ 2~4℅2~4℅
Flow rate: 2~8 BV/h 4~8 BV/h2~8 BV/h
Minimum contact time: 30min
Slow rinse: 5 BV at regeneration flow rate
Fast rinse: 10 BV at service flow rate
*1 BV(Bed Volume)= 1 solution per resin