High-Quality Ion Exchange Resin for Water Treatment | Durable Anion Exchange Resin by Dowex

Product Description

Index

Name	Specification
Appearance	White to pale yellow clear spherical beads
Polymer Structure	Gel polystyrene crosslinked with divinylbenzene
Functional Group	-N(CH₃)₃
Ionic Form as shipped	OH^-
Weight Exchange Capacity	≥3.6mmol/g
Volume Exchange Capacity	≥1.3mmol/ml
Real Density (g/ml）	1.06-1.09g/ml
Bulk Density (g/ml)	0.66~0.71g/ml
Water Retention Capacity	53%~47%
Particle Size Range	0.315~1.25 mm≥95
Uniformity Coefficient	≤1.6
Whole Bead Count（%）	≥95%

Reference Operation Conditions

Maximum operating temperature	100℃
Resin filling height	1~3m
Operating velocity	2~10BV/h
Backwash velocity	4~10BV/h
Regeneration (desorption) velocity	1~2BV/h
Regeneration agent	2BV3~5%HCI，2BV2~4% NaOH

Application

used for preparation of pure water

wastewater treatment

Precautions

Resin should be wet state preservation. The best temperature is above 0℃. Resin should be put into a closed space or add in salt water of 5% or above if not used for a long time.Should be anti-freezing during transportation. Do not place heavy objects on the resin in case being crashed.

Generally requires alkali- water - acid - water flow path for processing. Strict requirement needs three circulation before coming to final ion kenel.

Need to consider different transformation expansion rate to set aside enough space to prevent resin overflow and ensure the appropriate liquid level height; Column diameter ratio should be within a reasonable range and avoid bias current; Use wet packed column or back-flushing to wash away bubbles inside resin layer.

Before liquid going into the resin column, steps as flocculation, filtration, or sand-filtration should be taken so that it doesn’t jam resin pore with suspended solids .

Resin inside the column that hasn’t been used for a long time should be storaged outside of the column after washing, or adding salt water in the salt resistant medium while keeping liquid level not dehydrated with usual backwashing to loosen resin in case of agglomeration.

Strong Base Anion Exchange Resin 201X8 OH FAQ

What is Strong Base Anion Exchange Resin 201×8 (OH⁻ form) used for?

201×8 (OH⁻ form) is primarily used in demineralization and deionization processes, especially for producing high-purity water in power plants, electronics, pharmaceuticals, and laboratories. It effectively removes strong acid anions such as sulfate, nitrate, and chloride.

What is the difference between the OH⁻ form and Cl⁻ form of 201×8 resin?

The OH⁻ form exchanges hydroxide ions, making it suitable for mixed bed or polishing applications, while the Cl⁻ form is generally used in two-bed demineralization systems. The OH⁻ form produces deionized water without adding chloride, which is critical for ultrapure water systems.

What are the key characteristics of 201×8 (OH⁻) resin?

201×8 (OH⁻) is a Type I strong base anion exchange resin with quaternary ammonium functional groups. It offers high chemical resistance, strong basicity, low organic fouling tendency, and excellent operating stability across a wide pH range.

How is 201×8 (OH⁻) regenerated?

The resin in OH⁻ form is typically regenerated using sodium hydroxide (NaOH). After regeneration, the resin must be thoroughly rinsed to remove excess regenerant and ensure high-quality ion exchange performance.

What are common applications of 201×8 (OH⁻) resin?

It is widely used in mixed-bed ion exchange systems, electronic-grade water production, pharmaceutical ultrapure water systems, and high-pressure boiler feed water treatment, where stringent water purity is required.

What is the ideal pH and operating condition for 201×8 (OH⁻) resin?

The resin operates effectively across a pH range of 1–14, with an ideal service temperature below 60°C (140°F) for optimal performance and longevity in ion exchange cycles.