Strong-Base Anion Uniform-Particle Resin (Type I)
Uniform-particle Type I gel resin for final demineralization and silica removal.
Type I quaternary-ammonium strong-base anion resin with the strongest basicity and better silica removal than Type II—suited as the anion component of final demineralization and polishing mixed beds. Uniform structure improves regeneration efficiency and reduces rinse-water use.
| Grade | XR-SBA-002 Uniform Strong Base Anion Exchange Resin, Type I |
|---|---|
| Ionic Form | OH- strong-base anion (Type I quaternary ammonium) |
| Matrix | Styrene-divinylbenzene (DVB) |
| Structure | Uniform-Particle Gel |
| Suitable Conditions | Final demineralization / silica removal · anion component of polishing mixed beds · demineralization systems needing high regeneration efficiency |
| Not Recommended (assess first) | Direct feed of high-organic raw water (precede with macroporous weak base) · long-term high-temperature alkaline service (evaluate against TDS temperature limit) |
| Particle Size · Packaging · Shelf Life | 0.3 - 1.2 mm · packaging and shelf life per grade TDS |
| Total exchange capacity | 1.0 - 1.4 eq/L (Cl⁻ form) |
| Moisture retention | 50 - 58 % |
| Particle size | 0.3 - 1.2 mm, uniform |
| Operating pH | 0 - 14 |
| Max. operating temperature | 60 °C (OH⁻ form) |
| Regeneration | 2 - 4 BV, 4 - 8 % NaOH |
| Functional group | Quaternary ammonium (Type I) |
| Typical values for this grade family; contract values are set by the batch CoA/TDS. | |
| Documents | Download TDS / MSDS from the top of the page; CoA samples and third-party verification reports are available on request on request |
Parameters on this page are representative descriptions under typical test conditions and do not constitute a performance commitment; specific values are governed by the corresponding grade's batch CoA and TDS. Where operating boundaries are unclear, we recommend starting with a service assessment。
Type I, type II or weak base?
Type I quaternary ammonium resin is the standard for demineralization and silica removal: it is more thermally stable and holds capacity at low pH. Type II offers higher capacity but lower stability, and weak base resin removes strong acids only — it is a workhorse for organic removal and partial demineralization, not for silica.
Silica is the parameter that sizes the bed
Silica removal is slow and pH-dependent. In a two-bed demineralizer, the anion bed does the silica work and needs enough contact time and caustic to regenerate. If the outlet silica target is tight, a polishing mixed bed is usually cheaper than over-sizing the primary anion bed.
Regeneration with caustic
| Regenerant | 4 – 8% NaOH |
|---|---|
| Dosage | 2 – 4 BV, or 60 – 120 g NaOH per litre |
| Temperature | 40 – 50 °C improves silica removal; check the resin's limit |
| Rinse | 2 – 4 BV, to a conductivity and silica target |
Hot caustic improves silica elution but accelerates degradation of the quaternary group. If you run hot, verify the resin's thermal stability data and monitor capacity annually; the cheapest operating point is not always the lowest chemical consumption.
Organic fouling
Surface water with high TOC fouls anion resin irreversibly if the organics are not removed upstream. A macroporous grade tolerates more organic load and can be cleaned with caustic brine; a gel grade in the same service will lose capacity faster. If you see rising rinse conductivity, declining silica removal or a darkening bed, treat it as a pre-treatment problem first.
Frequently asked
Can I use SBA for nitrate removal?
Standard SBA removes nitrate but without selectivity; sulfate competes. For nitrate-selective duty, use a nitrate-selective resin and design for brine regeneration.
Why does the outlet pH rise after regeneration?
Residual caustic in the bed. Extend the rinse or improve distribution; a short polish bed downstream can also buffer it.