The purpose of this research is to absorb and remove sulfur dioxide existing in the air by using ion exchange non-woven fabric. So we found out very appropriate condition of anionic exchange fabric scrubber by measuring amount of SO2 adsorption under the atmosphere that concentration, velocity, and humidity was 100~200 ppm, 0.6~1.0 m/sec, and 30~90 RH%, respectively. Ion exchange capacity of ion exchanger showed the maximum value, 3.75 meq/g at pH 4, and adsorption equilibrium time was the maximum value, 30 h when gas velocity was 0.6 m/sec, moreover, at 80 ℃, adsorption equilibrium time tended to decrease more than 10 h. When concentration was 200 ppm, while reaction speed between SO2 and ligand of fibrous ion exchanger was getting faster, adsorption break point had a tendency to get faster as well. In addition, when relative humidity in the scrubber was 90%, adsorption efficiency was 7.6%/h that seemed to be 30% higher than 4.6%/h coming from the condition that relative humidity had been 30%, and it was totally adsorbed under 5 wt% NaOH solution in 5 minutes.

본 연구는 이온교환 부직포를 이용하여 대기중의 아황산 가스를 흡착제거 시키기 위하여 가스의 농도는 100~200 ppm, 유속을 0.6~1.0 m/sec, 습도를 30~90 RH%로 하여 SO2의 흡착량을 측정하여 음이온교환 섬유 스크러버의 최적조건을 도출하였다. 이온교환체의 이온교환 용량은 pH=4에서 최대 3.75 meq/g이였으며 또한 유속이 0.6 m/s일 때 흡착평형시간이 30시간으로 최대를 나타냈으며, 온도가 80 ℃일 때 흡착평형시간이 최대 10시간이상 짧아지는 경향을 나타냈다. 농도가 200 ppm의 경우 이온교환 섬유의 리간드와 SO2와의 반응속도가 빨라져 흡착 파괴가 빨라지는 경향을 나타냈으며 또한 스크러버 내의 상대습도가 90%일 때 7.6%/h의 제거율을 보였는데 이는 상대습도가 30% 일 때 4.6%/h보다 30%정도 높은 제거율을 나타내었으며 또한 5 wt% NaOH용액으로 5분 이내에 완전 탈착이 되었다.

Keywords: scrubber; fibrous ion exchanger; sulfur dioxide; swelling ratio; adsorption capacity