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폐벌목(廢伐木)에서 활성탄(活性炭) 개발(開發)을 위한 목탄(木炭) 제조(製造)의 최적화(最適化) 방안(方案)에 관(關)한 연구(硏究)
김종문,정찬교,민병훈,Kim, Jong-Moon,Chung, Chan-Kyo,Min, Byong-Hoon 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.5
Using a pinus koraiensis and pinus rigida which are normally being discarded in South Korea, the optimal condition of producing charcoals has been studied to develop activated carbons which can be recycled as a higher value-added product. A study on manufacture of activated carbons from a discarded timber consists of two processes, the production process of charcoals from a discarded timber by low temperature pyrolysis process and the production process of activated carbons from the charcoals by chemical activation reaction. This study deals with the production process of charcoals from a discarded timber by low temperature pyrolysis process. As a results of experiment, it was investigated that charcoals produced through drying at $150^{\circ}C$ for 6hr and pyrolysis process at $500^{\circ}C$ for 1hr had the highest values in physical properties such as iodine number and BET surface area. Furthermore, through observing SEM images, the maximum development of porosity had been founded in this condition. It was confirmed that values of physical properties on using a pinus koraiensis are superior to the ones when using a pinus rigida. When charcoals were produced from a pinus koraiensis in this condition, BET surface area was approx. $640m^2/g$. 국내에서 대표적으로 버려지는 폐벌목인 잣나무와 리기다소나무를 이용하여 고부가가치 제품으로 활용할 수 있는 활성탄 개발을 위해 목탄 제조의 최적조건을 측정하였다. 폐벌목 활성탄 제조에 관한 연구는 저온열분해 공정에 의한 폐벌목의 목탄 제조공정과 화학적 활성화반응을 이용한 목탄의 활성탄 제조공정으로 나누어지며 본 논문은 저온열분해에 의한 폐벌목의 목탄 제조공정을 다루고 있다. 실험결과, 목탄 제조공정의 경우 $150^{\circ}C$에서 6시간 건조 후 $500^{\circ}C$에서 60분 동안 열분해 공정을 거쳐 생성된 목탄이 요오드 흡착력과 비표면적(BET)등의 물성이 가장 우수하였으며 SEM사진을 관찰한 결과 이 조건에서 세공이 발달함을 알 수 있었다. 일반적으로 잣나무를 이용하여 제조된 목탄의 물성치가 리기다소나무를 이용한 목탄보다 우수함을 알 수 있었다. 본 연구의 최적 실험조건에서 잣나무를 이용한 목탄의 경우 BET값이 약 $640m^2/g$에 이르렀다.
폐벌목(廢伐木)을 이용(利用)한 활성탄(活性炭) 개발(開發)에 관(關)한 연구(硏究)
김종문,정찬교,민병훈,Kim, Jong-Moon,Chung, Chan-Kyo,Min, Byong-Hoon 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.6
국내에서 대표적으로 버려지는 폐벌목인 잣나무와 리기다소나무를 이용하여 고부가가치 제품으로 활용할 수 있는 활성탄 개발을 위해 활성탄 제조의 최적조건을 측정하였다. 폐벌목 활성탄 제조에 관한 연구는 저온열분해 공정에 의한 폐벌목의 목탄 제조공정과 화학적 활성화 반응을 이용한 목탄의 활성탄 제조공정으로 나누어지며 본 논문은 화학적 활성화 반응을 이용한 목탄의 활성탄 제조공정을 다루고 있다. 일반적으로 활성화제는 알칼리 약품을 이용하고 있으며 본 연구에서는 탄소와 활성화 반응이 잘 이루어지는 KOH와 NaOH를 사용하였다. 실험결과, KOH로 제조된 활성탄이 NaOH로 제조된 활성탄 보다 요오드 흡착력과 비표면적(BET) 등 물성이 우수하였으며 이는 세정공정 후 활성탄의 잔류물이 KOH는 검출되지 않았으나 NaOH는 $3{\sim}4%$의 잔류물이 있는 것으로 보아 목탄과 KOH의 반응이 더 활발함을 알 수 있었다. 일반적으로 잣나무를 이용하여 제조된 활성탄의 물성치가 리기다소나무를 이용한 활성탄 보다 우수함을 알 수 있었다. 목탄과 활성화제의 최적 침적비율은 400 wt.%임을 알 수 있었다 세정방법은 5M 염산용액으로 세척하여 중화시킨 후 증류수로 세정하는 방법이 활성탄의 물성을 높일 수 있었다. 본 연구의 최적 실험조건에서 잣나무를 이용하여 제조된 활성탄의 경우 BET값이 약 $2400\;m^2/g$에 이르렀다. Using a Pinus koraiensis and Pinus rigida which are normally being discarded in South Korea, optimal conditions of producing activated carbons have been studied to recycle as a higher value-added product. This study consists of two processes, the production process of charcoals from waste timbers by low temperature pyrolysis and the production process of activated carbons from the charcoals by chemical activation reaction. This paper deals with the production process of activated carbons from the charcoals by chemical activation reaction. As an alkali has been generally used as an activating agent, KOH and NaOH which react well with a carbon were used in this study. As a result of the experiments, it is confirmed that activated carbons made with KOH treatment had superior values in physicochemical properties to NaOH, showing that there was no remain of KOH at the surface of the charcoals while there was $3{\sim}4%$ of NaOH remaining after the experiments. Thus, it is concluded that KOH reacted more actively with a charcoal than NaOH. Moreover, it was also found that values in physicochemical properties when using a Pinus koraiensis are superior to the ones when using a Pinus rigida. The optimal mixing ratio of an activating agent to a charcoal was 400 wt.%. To improve the physicochemical properties, activated carbons were washed out by distilled water after neutralization with SM hydrochloric acid solution. When activated carbons were produced from a Pinus koraiensis in this optimal conditions, value of BET surface area was found to be approx. $2400\;m^2/g$.
강성원(Sung Won Kang),민병훈(Byong Hoon Min),서성섭(Sung Sup Suh) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.2
The VOCs(Volatile Organic Compounds) is one of the major cause for the atmosphere pollution. Breakthrough behavior of benzene and toluene in adsorption bed packed with activated carbon was experimentally studied. Composition and temperature of the gas flowing in the bed was measured and breakthrough curves for each component was obtained. Breakthrough time of benzene was earlier than that of toluene due to relatively weak adsorptivity. The relationship between breakthrough time and flow rate was obtained. The shape of temperature change with time was dependent on the position in the bed. Temperature changed faster and sharper in the inlet than in the outlet. It was noted that breakthrough behavior could be affected by the heat transfer properties.
활성탄을 충전한 흡착탑에서 벤젠 회수를 위한 세정공정의 연구
강성원(Sung Won Kang),민병훈(Byong Hoon Min),서성섭(Sung Sup Suh) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.2
N/A Experimental Study was carried out for benzene desorption by purge gas or evacuation in an activated carbon bed. As purge gas flow rate increased, desorption rate increased due to the higher interstitial linear gas velocity. For various purge gas flow rates, desoption curves almost got together if they were plotted against dimensionless time. At a higher flow rate, mass transfer zone became narrower. Temperature drop in the bed was more fast and severe at higher flow rates and higher outer temperature. It was found out that desorption was almost completed when the temperature in the drop of the bed returned to the initial temperature before temperature drop. Desorption by vacuum purge was completed in shorter time than desorption by purge gas. Counter current purge was more effective than cocurrent purge.