UPTAKE RATE OF TANNIC-ACID BY STRONG-BASE GEL-TYPE ANION RESINS

A series of experiments were conducted to determine the uptake rates o f tannic acid by styrenic strong-base Type-1, anion-exchange resins wi th a wide variety of moisture contents. Our goal was to determine the relationships between gel-phase moisture, total capacity, and physical structure for tannic acid uptake capacity and leakage. The results sh ow a strong correlation between the increasing moisture content and im proved exchange of chlorides for tannin. It was found that initial per formance and performance stability as defined by the height of the tra nsfer unit (HTU), for tannin/chloride exchange was dependent on the mo isture content of the gel phase of the resin. The resins tested had ge l-phase moisture contents that ranged from 40.7% to 80.8% (chloride fo rm).