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폐감귤박으로 제조한 활성탄에 의한 아세톤, 벤젠 및 메틸메르캅탄의 흡착특성
감상규 ( Sang-kyu Kam ),강경호 ( Kyung-ho Kang ),이민규 ( Min-gyu Lee ) 한국공업화학회 2017 공업화학 Vol.28 No.6
활성화제로 KOH, NaOH 및 ZnCl<sub>2</sub>를 사용하여 폐감귤박으로부터 활성탄을 제조하였다. 최적조건(활성화제의 침적비율 300%, 활성화 온도 : KOH의 경우 900 ℃, NaOH의 경우 700 ℃, ZnCl<sub>2</sub>의 경우 600 ℃, 활성화 시간 1.5 h)에서 제조한 활성탄을 각각 ACK, ACN 및 ACZ로 명명하였다. 이들 활성탄을 사용하여 회분식 반응기에서 아세톤, 벤젠 및 메틸메르캅탄(MM) 등의 3가지 대상가스에 대한 흡착 특성을 검토하였다. 이들 활성탄에 의한 3가지 대상 가스의 흡착은 Langmuir 모델식보다는 Freundlich 모델식에 더 부합되는 것으로 나타났다. 그리고 흡착 속도실험결과는 유사1차 속도식보다는 유사 2차 속도식에 잘 부합하였으며, 입자 내 확산 모델 결과는 흡착 과정에서 외부물질전달과 입자확산이 동시에 일어나는 것을 시사해 주었다. Activated carbons were prepared from waste citrus peels using KOH, NaOH, and ZnCl<sub>2</sub> as activating chemicals. They were prepared at optimal conditions including the chemical ratio of 300%, activation time of 1.5h, and activation temperature of 900 ℃ for KOH, 700 ℃ for NaOH, and 600 ℃ for ZnCl<sub>2</sub>, which were named as ACK, ACN, and ACZ, respectively. Using the activated carbons, their adsorption characteristics for three target gases such as acetone, benzene, and methylmercaptan (MM) were carried out in a batch reactor. The adsorption behavior of activated carbons for three target gases followed the Freundlich model better than the Langmuir. And the experimental kinetic data followed a pseudo-second-order kinetic model more than pseudo-first-order one. Following the intraparticle diffusion model suggested that the external mass transfer and particle diffusion were occurred simultaneously during the adsorption process.
감상규 ( Sang-kyu Kam ),강경호 ( Kyung-ho Kang ),이민규 ( Min-gyu Lee ) 한국공업화학회 2017 공업화학 Vol.28 No.6
제주도에서 다량 발생하고 있는 폐감귤박을 활성화제로 KOH를 사용하여 활성탄을 제조하였고, 제조된 활성탄의 특성을 검토하였다. KOH 침적비율(100~300%), 활성화 온도(400~900 ℃) 및 활성화 시간(0.5~1.5 h)의 조건에서 각 조건이 증가할수록 요오드 흡착능은 증가하였으나 활성탄의 수율은 감소하였다. 그리고 활성화 시간의 경우 1.5 h 이상에서는 요오드 흡착능 및 활성탄 수율에서 비슷하였다. 또한 KOH 침적비율이 증가할수록 비표면적 및 세공부피는 증가하였으나 세공크기는 감소하였으며, 제조된 평균 세공크기는 20~25 Å이었다. KOH의 침적비율 300%, 활성화 온도 900 ℃, 활성화 시간 1.5 h에서 제조된 활성탄은 비표면적 및 요오드 흡착능이 각각 1,527 m<sup>2</sup>/g 및 1,246 mg/g으로 가장 높았다. An activated carbon was prepared from waste citrus peel produced in large amounts in Jeju Island, Korea, using KOH activa-tion and its characteristics was examined. Under the condition of the KOH ratio between 100 and 300%, activation temper-ature from 400 to 900 ℃ and activation time from 0.5 to 1.5 h, the iodine adsorptivity of the activated carbon prepared increased but the yield decreased with respect to the increase of each conditions. The iodine adsorptivity and yield of the activated carbon prepared at the activation time of more than 1.5 h were similar to those of using 1.5 h. In addition, as the KOH ratio increased, the specific surface area and pore volume of the activated carbon increased, but the pore diameter decreased. The activated carbon has an average pore diameter of 20~25 Å. Also, the activated carbon prepared at 300% KOH and 900 ℃ for 1.5 h has the highest specific surface area of 1,527 m<sup>2</sup>/g and iodine adsorptivity of 1,246 mg/g.
폐감귤박으로 제조한 활성탄을 충전한 고정층 반응기에서 아세톤, 벤젠 및 메틸메르캅탄의 흡착특성
감상규 ( Sang-kyu Kam ),강경호 ( Kyung-ho Kang ),이민규 ( Min-gyu Lee ) 한국공업화학회 2018 공업화학 Vol.29 No.1
폐감귤박으로 제조한 활성탄(WCAC)을 충전한 고정층 반응기에서 아세톤, 벤젠 및 메틸메르캅탄(MM)의 3종류의 대상가스에 대한 흡착특성을 검토하였다. 단일성분계의 경우에 파과곡선으로부터 구한 파과시간은 유입농도 및 유량이 증가할수록 감소하였으나 형상비(L/D)가 증가할수록 증가하였다. WCAC에 의한 대상가스의 흡착량은 유입농도 및 형상비가 증가할수록 증가하였으나 유량증가에 따른 흡착량은 대상가스에 따라 차이를 나타내었다. 파과시간 및 흡착량 결과에 의하면 WCAC에 대한 친화력은 벤젠이 가장 높고, 다음으로 아세톤 그리고 MM의 순서이었다. 한편, 2성분계 및 3성분계 혼합가스의 흡착 경우에 파과곡선은 WCAC와 친화력이 작은 흡착질은 친화력이 큰 흡착질로 치환되면서 roll-up 현상을 보였다. 그리고 WCAC에 의한 아세톤의 흡착은 황화합물인 MM보다 비극성인 벤젠과 혼합되어 있을 경우에 영향을 크게 받는 것으로 나타났다. Adsorption experiments of three target gases such as acetone, benzene, and methyl mercaptan (MM) were carried in a continuous reactor using the activated carbon prepared from waste citrus peel. In a single gas system, the breakthrough time obtained from using the activated carbon (WCAC) prepared from waste citrus peel. In a single gas system, the breakthrough time obtained from the breakthrough curve decreased with increasing the inlet concentration and flow rate, but increased with respect to the aspect ratio (L/D). Adsorbed amounts of the target gases by WCAC increased as a function of the inlet concentration and aspect ratio. However, adsorbed amounts with the increase of the flow rate were different depending upon target gases. Results from the breakthrough time and adsorbed amount showed that the affinity for WCAC was the highest in benzene, followed by acetone and then MM. On the other hand, in the binary and ternary systems, the breakthrough curve showed a roll-up phenomenon where the adsorbate having a small affinity for WCAC was replaced with the adsorbate with a high affinity. The adsorption of acetone on WCAC was more strongly affected when mixing with the nonpolar benzene than that of using sulfur compound MM.
갑상선 수술 시 Fibrin Tissue Glue의 사용에 대한 후향적 연구
김찬호,최준호,정유승,강경호,한원식,노동영,오승근,윤여규,Chan Ho Kim,Jun Ho Choe,Yu Seung Jung,Kyung Ho Kang,Wonshik Han,Dong- Young Noh,Seung Keun Oh,and Yeo-Kyu Youn 대한갑상선-내분비외과학회 2006 The Koreran journal of Endocrine Surgery Vol.6 No.1
Purpose: This study was designed to determine the effectiveness of fibrin tissue glue for reducing the amount of drainage and shortening the hospital stay. Methods: 255 patients who underwent thyroidectomy due to papillary thyroid carcinoma (179 cases of total thyroidectomy and 76 cases of total thyroidectomy with unilateral modified radical neck dissection) were analyzed retrospectively. The clinical factors were compared between the case group (fibrin glue) and the control group (conventional hemostasis). This comparison was separately done for the cases of total tyroidectomy alone and for the cases of total thyroidectomy with MRND. Results: There were no significant differences between the two groups for the amount of drainage and the length of the hospital stay for patients who underwent total thyroidectomy alone. On the other hand, for patients who underwent total thyroidectomy with unilateral MRND, a significant reduction of the average amount of drainage (case group: 37.52±9.41 ml, control group: 42.89±10.82 ml, P*=0.025) and a significantly shortened hospital stay (case group: 3.43±0.50 days, control group: 3.75±0.69 days, P*=0.021) were observed in the case group. Conclusion: From the results of this study, we recommend the use of fibrin glue after extensive radical neck surgery such as modified radical neck dissection. Prospective randomized studies should be carried out to confirm and expand our results. (Korean J Endocrine Surg 2006;6:22-26)