Uptake rate of tannic acid by strong-base gel-type anion resins

A series of experiments were conducted to determine the uptake rates of tannic acid by styrenic strong-base Type-1, anion-exchange resins with 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 show a strong correlation between the increasing moisture content and improved exchange of chlorides for tannin. It was found that initial performance and performance stability as defined by the height of the transfer unit (HTU), for tannin/chloride exchange was dependent on the moisture content of the gel phase of the resin. The resins tested had gel-phase moisture contents that ranged from 40.7% to 80.8% (chloride form).