MASS TRANSFER IN SEMI-FLUIDIZED AND FLUIDIZED ION-EXCHANGE BEDS

Park, Young Gun; Cho, Sung Yong; Kim, Seung Jai; Lee, Byung Gwon; Kim, Byung Hoon; Park, Song-Ja

Environmental Engineering Research 1999;4(2): 71-80.

Young Gun Park¹^†, Sung Yong Cho¹, Seung Jai Kim¹, Byung Gwon Lee², Byung Hoon Kim³, and Song-Ja Park⁴

¹Dept. of Environmental Engineering, Chonnam National University, Kwang-Ju, Korea
²Dept. of Environment and CFC, KIST, Seoul, Korea
³Dept. of Chem. Eng., Sunchon National University, Sunchon, Korea
⁴Dept. of BBRC, KIST, Seoul, Korea

Corresponding Author: Young Gun Park ,

Received: April 19, 1998; Accepted: August 19, 1998.

ABSTRACT

Mass transfer of copper ion between aqueous solution of copper sulfate and ion exchange resin particles was studied experimentally in fluidized and semi-fluidized beds. The beds were made of transparent acrylic resin tubes, 60mm in diameter, and the solid particle is strong cation exchange resin(Amberlyst 200C, 0.651, 0.774mm in mean diameter). The bed height, pressure drop, and exit concentration change in semi-fluidized bed were continuously measured during the experiment. The initial conversion(X_ε) and mass transfer coefficients(k_L) of semi-fluidized beds were 0.936 — 0.957 and 0.0624 — 0.0734(mm/s), respectively. The mass transfer coefficients in fixed, fluidized and semi-fluidized beds were 0.0681, 0.0659 and 0.0690 We have found that k_L of semi-fluidized bed has shown the largest in three ones. The experimental breakthrough curves were compared with the predicted ones from the axial dispersion model for fixed, fluidized and semi-fluidized beds.

Keywords: semi-fluidized bed | fluidized bed | ion-exchange resin | mass transfer