산업단지 휘발성 유기화합물 제거용 활성탄의 저온 탈착 반응 연구 = Investigation on Low Temperature Desorption Reaction of used Activated Carbons Collected from VOCs Adsorption Towers

다국어 초록 (Multilingual Abstract)

Low temperature desorption of the used activated carbons that contain VOCs (Volatile Organic Compounds)produced from Shiwha/Banwal industrial complex were investigated. Iodine number and BET specific surface area of the activated carbons manufactured by N company in China were measured to see their characteristics prior to use in the experiment. Activated carbons were used to adsorb VOCs in a company of Shiwha/Banwal complex. Used activated carbons were collected and desorbed by the desorbing facility. After 1st adsorption and 1st desorption samples were taken for analysis. Desorbed activated carbons were reused in the same company.
After 2nd adsorption and 2nd desorption samples were taken again for analysis. 4 samples were analyzed by TGA (Thermogravimetric Analyzer) at 170℃ with a heating rate of 10℃/min. Also, activation energies and reaction orders of desorption reaction were assessed by employing Friedman method and Freeman-Carroll method. The activation energies were 16.86 kJ/mol by Friedman method and reaction orders were 0.36∼5.16 by Freeman-Carroll method.

국문 초록 (Abstract)

시화/반월 산업단지 내 배출되는 VOCs (Volatile Organic Compounds)를 흡착시킨 활성탄의 저온 탈착에 대해조사하였다. 먼저 본 실험에 사용된 중국 N사의 흡착 전 활성탄 특성을 파악하기 위해 요오드가와 BET비 표면적을 측정하였다. 그 후 활성탄은 시화/반월 산업체에서 배출된 VOCs를 흡착시킨 후 탈착기로 탈착시켰다.
이 과정에서 1차 흡착 후 시료와 1차 탈착 후 시료를 채취하였다. VOCs를 탈착시킨 재생활성탄은 재사용하였으며 마찬가지로 2차 흡착 후 및 탈착 후 시료를 채취하였다. 4개의 시료는 TGA (Thermogravimetric Analyzer)Analyzer)를 이용하여 질소분위기 하 승온속도 10 ℃/min으로 170℃까지 가열한 뒤 등온상태를 100분간 유지해 탈착특성을 확인하였다. 또한 승온속도에 따른 탈착특성 비교를 위해 1차 흡탈착시료를 이용해 활성화 에너지와 반응차수를 구하였다. 활성화 에너지와 반응차수는 Friedman법과 Freeman-Carroll법으로 구하였고, 시료의 반응차수는 5℃/min, 10℃/min, 20℃/min에서 각각 5.16, 3.4, 0.36이였으며, Friedman법으로 구한 활성화 에너지는 16.86 kJ/mol이었다.

참고문헌 (Reference)

1 서봉국, "휘발성 유기 화합물(VOCs) 처리 기술" 한국환경과학회 12 (12): 825-833, 2003

2 양동집, "시화/반월 산단내 화학제품 제조업종에서 수거한 폐활성탄의 탈착특성 연구" 한국냄새환경학회 8 (8): 173-178, 2009

3 Rhee, Y. W, "The study of management plan and appropriate replacement cycle for the activated carbon and scrubbing liquid in Shiwha/Banwal industrial complex" Siheung Environmental Technology Development Center 2008

4 Freeman, E. S, "The application of thermo-analytical techniques to reaction kinetics - the thermo-gravimetric evalution of the kinetics of the decomposition of calcium oxalte monohydrate" 62 : 394-397, 1958

5 Rhee, Y. W, "Investigation on recovery of energy resources from waste activated carbons generated in VOCs adsorption towers of Shiwha/Banwal industrial complex" Siheung Environmental Technology Development Center 2009

6 Rhee, Y. W, "Efficiency Evaluation of Activated Carbon Beds Operated on Shiwha/Banwal Industrial Complex" Siheung Environmental Technology Development Center 2007