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D301
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D301

D301 is a macroporous weakly basic anion exchange resin with a polystyrene skeleton, containing -N(CH3)2 groups. It is less basic than strong base resins, easy to regenerate, and has a working exchange capacity three times that of strong base resins, with resistance to organic pollution. Manufactured using a unique process, it possesses high mechanical strength and chemical stability. It is used for the preparation of pure water and ultrapure water, especially suitable for treating water sources with high salt and organic content. It can also be used for treating chromium-containing wastewater and decolorizing sugar solutions.

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  • 1. Product Introduction:

    D301 is a macroporous weakly basic anion exchange resin with a polystyrene skeleton, containing -N ( CH3 ) 2 , with alkalinity weaker than strong base resins, easy to regenerate, and its working exchange capacity is 3 times that of strong base resins, resistant to organic pollution. It is made using a unique process and composition, thus possessing high mechanical strength and chemical stability. It is used for pure water and ultrapure water preparation, especially suitable for treating water sources with high salt and organic content. It can also be used for chromium-containing wastewater treatment and sugar solution decolorization.

     

    2. Performance Indicators:

    Appearance

    Milky white or light yellow opaque spherical beads

    Maximum Regeneration Capacity

    ≥4.8 mmol/g

    Strong Base Group Capacity

    ≤1.0 mmol/g

    Volume Exchange Capacity

    ≥1.45 mmol/ml

    Moisture Content

    48%~58%

    Wet True Density

    1.03~1.06 g/ml

    Wet Apparent Density

    0.65~0.72 g/ml

    Particle Size Range

    0.315~1.25 mm

    Effective Particle Size

    0.40-0.70mm

    Uniformity Coefficient

    ≤1.6

    Sphericity and Abrasion Resistance Rate

    ≥90%

     

    3. Reference Operating Conditions:

    Maximum Operating Temperature

    ≤100℃

    Resin Bed Height

    1~3 m

    Operating Flow Rate

    2~10 BV/h

    Backwash Flow Rate

    4~10 BV/h

    Regeneration (Desorption) Flow Rate

    1~2 BV/h

    Regenerant Dosage

    2 BV of 3~5% HCl, 2 BV of 2~4% NaOH

     

    4. Product Applications:

      1. Water Treatment:

      D301 resin can remove free strong acids in water (such as hydrochloric acid, sulfuric acid, nitric acid). It can also remove carbonate in the early stage of operation but will release it again in the mid to late stages, so it cannot remove weak acids. In deionization systems, D301R should be placed before the strong base anion exchanger to reduce organic contamination of the latter; when the decarbonation tower is placed after the weak base anion exchanger, its working exchange capacity can be improved. The regeneration waste liquid from the strong base unit can be used to regenerate D301R, thus reducing environmental pollution and saving regenerants.

      2. Xylose Desalting and Decolorization:

      D301R used in combination with 001X7 strong acid resin has good decolorization ability for corn cob hydrolysate (after activated carbon decolorization). The process can use strong acid resin (001X7) followed by weak base resin (D301R), or weak base–strong acid–weak base processes. The desalting and decolorization of this material with D301R differs from general water treatment applications; sugar addition should be increased before operation, and sugar removal should be increased before regeneration to reduce material loss. The regenerant dosage is about twice that of general water treatment.

      3. Formaldehyde Acid Removal:

      D301 can remove formic acid contained in formaldehyde.

      4. Chromium-containing Wastewater Treatment:

      D301 can be used to recover chromates from electroplating rinse water and cooling tower discharge, exhibiting excellent oxidation resistance.

     

    5. Precautions:

      1. Product Transportation and Storage:

      Store the product wet, preferably above 0°C; for long-term storage, seal tightly or add more than 5% brine; during transportation, prevent freezing and do not place heavy objects on the resin to avoid crushing.

      2. Resin Pretreatment:

      Generally, an alkali-water-acid-water process can be used; for strict requirements, three cycles are needed, finally treating to the required ionic form.

      3. Resin Loading:

      Consider the resin's swelling rate during ion exchange, reserve enough space to prevent overflow and ensure proper liquid level; the column diameter ratio should be reasonable to avoid channeling; use wet loading or backwash to remove air bubbles inside the resin bed.

      4. Before liquid enters the resin column, it should be flocculated, filtered, or sand filtered to ensure no suspended solids to avoid clogging resin pores.

      5. Resin unused in the column for a long time should be washed out and stored, or kept in saltwater in a salt-resistant medium, maintaining the surface moisture and periodically backwashed to loosen the resin to prevent caking and spoilage.

D301


D301 is a macroporous weakly basic anion exchange resin with a polystyrene skeleton, containing -N(CH3)2 groups. It is less basic than strong base resins, easy to regenerate, and has a working exchange capacity three times that of strong base resins, with resistance to organic pollution. Manufactured using a unique process, it possesses high mechanical strength and chemical stability. It is used for the preparation of pure water and ultrapure water, especially suitable for treating water sources with high salt and organic content. It can also be used for treating chromium-containing wastewater and decolorizing sugar solutions.

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