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남정광 ( Jung Kwang Nam ),김병석 ( Byung Seok Kim ),김경수 ( Kyung Soo Kim ),문덕진 ( Duk Jin Moon ) 대한소화기학회 2010 대한소화기학회지 Vol.55 No.1
목적: 숙변성 대장 천공은 드물지만 치명적인 질환이다. 이 연구의 목적은 이 질환의 임상적 분석을 통해 진단과 치료에 도움이 되고자 한다. 대상 및 방법: 2000년 1월부터 2009년 2월까지 대장천공으로 수술한 92예를 대상으로 후향 분석을 하였다. 숙변성 천공의 진단은 Maurer의 진단기준에 따랐다. 결과: 8예(8.7%)에서 숙변성 천공으로 진단되었다. 연령분포는 59세에서 85세였다. 모든 환자가 여성이었으며 만성변비의 과거력이 있었다. 수술 전에 숙변성 천공으로 진단된 경우는 2예(25%)였다. 천공은 모두 에스상결장에서 발생하였다. 7예에서 하트만 술식을 하였고 1예에서 일차봉합 및 에스상 결장의 루프식 장루술을 시행하였다. 1예에서 재발이 있었고 2예(25%)에서 패혈증과 다발성장기부전으로 사망하였다. 결론: 만성변비가 있거나 거동제한이 있는 환자가 급성 복증을 보일 때 숙변성 천공을 반드시 고려해야 할 것이다. 수술은 하트만 술식이 추천되며, 높은 사망률을 보이지만 즉각적인 수술로 낮출 수 있을 것으로 생각한다. Background/Aims: A stercoral perforation of the colon (SPC) is a rare, life-threatening disease. The aim of this study was to represent the definition of SPC and help the diagnosis and treatment of this condition. Methods: We reviewed 92 medical records of patients who underwent operation due to colonic perforation from January 2000 to February 2009 retrospectively. Maurer`s diagnostic criteria were used for the diagnosis of SPC. Results: Eight patients (8.7%) were diagnosed as SPC. The age of the patients ranged from 59 to 85 years old. All of the patients were female and had a history of long-standing constipation. Only two patients (25%) were diagnosed as SPC preoperatively. The site of perforation of all patients was sigmoid colon. The methods of operation were Hartmann`s procedure (7 cases), and primary repair with sigmoid loop colostomy (1 case). There were one recurrence and two deaths (25%) due to sepsis and multiple organ failure. Conclusions: SPC should be considered in chronically constipated, and bedridden patients who present with acute abdomen. Hartmann`s procedure is the treatment of choice in most situations. Mortality is high but can be minimized with early definitive surgery. (Korean J Gastroenterol 2010;55:46-51)
성형 Co-Ru-Zr-Si 촉매를 이용한 이산화탄소에 의한 메탄 리포밍
남정광 ( Jeong Kwang Nam ),이지혜 ( Ji Hye Lee ),송상훈 ( Sang Hoon Song ),안홍찬 ( Hong Chan Ahn ),장태선 ( Tae Sun Chang ),서정권 ( Jeong Kwon Suh ),김성보 ( Seong Bo Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.2
메탄 개질반응(CH4 reforming)은 온실가스(CH4와 CO2)를 합성가스(CO, H2)로 전환시켜 온실가스를 자원화 한다는 점에서 활발하게 연구가 진행되고 있다. 그러나 촉매 비활성화와 고온 반응으로 인해 아직 상업화된 공정이 없는 상황이다. 본 연구에서는 Co, Ru, Zr 금속과 담지체로 SiO2를 이용해 Co-Ru-Zr-Si (CRZS)촉매를 제조하고 이를 성형하여 메탄 개질반응 특성을 연구하고, 공정 개발을 위한 기초 자료를 얻고자 하였다. 성형촉매의 특성을 알아보기 위해 XRD, BET 그리고 EDS로 분석하였고, 메탄 및 이산화탄소 전환율은 GC (TCD detector)로 분석하였다. 또한 반응속도론적 연구로부터 반응속도상수를 구하였으며 반응물의 물질전달영향을 받지 않는 촉매크기를 선정하였다. 선정된 성형촉매는 850℃, 720 h에서도 활성을 유지하였다. The methane dry reforming has received the considerable attention in recent years, mainly as an attractive route to produce synthesis gas (CO, H2) from green-house gases (CH4, CO2) for resources. However, this process has not been commercialized due to the high temperature and catalyst deactivation. In this study, Co-Ru-Zr catalysts supported on SiO2 were studied for the characterization of methane dry reforming reaction and the preliminary data for process development were achieved. The crystal structure of catalysts was measured by XRD, the surface area and pore size were analyzed by BET, and the element composition of catalyst were analyzed by EDS. Conversions of methane and carbon dioxide were analyzed by GC. In addition, reaction rate constants were obtained from the reaction kinetic study and the optimum catalyst size that does not affect mass transfer from reactants was also determined. The selected pellet-type catalyst maintained activation for 720 h at 850 ℃.
남정광 ( Jeong Kwang Nam ),조득희 ( Deug Hee Cho ),서정권 ( Jeong Kwon Suh ),김성보 ( Seong Bo Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
The synthesis of dimethyl carbonate by liquid phase oxidative carbonylation of methanol was studied under batch reaction system. Reaction factors such as effect on various metals, anion containing in copper catalyst, temperature, carbon monoxide and oxygen molar ratio and copper content were investigated. In particular CuCl2·2H2O showed the excellent of the methanol conversion 65.2%, DMC selectivity 96.6% reaction condition under 1.0 g, 150 °C, MeOH/CO/O2=0.2/0.215/0.05 (molar ratio). CuCl2 led to corrosion of the reactor. Thus, a new catalyst system using supports was investigated to resolve these corrosion problem. Influence on various supports were examined and copper catalyst supported on zeolite Y showed the most excellent activity on the formation of dimethyl carbonate. The amount of Fe dissolved during the reaction using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometer) was compared with catalysts, calcined Cu/zeolite Y showed the lower value below 5% than CuCl2-2H(2)O.
박승조,남정광,김정섭,박정훈 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1
Phenol removal efficiency was 65-70 percent according to the results of phenol adsorption experiment loaded with activated carbon derived from leather waste by chemical activation with K₂CO₃ [ACLW], but phenol removal efficiency was 100 percent added with commercia1 activated carbon [AC]. Phenol adsorption experiment reacted with the phenol solution containing 1.25, 2.50, 5.00, 6.25 g/L during 90 minutes. However removal efficiency of Blue 79 was 100 percent loaded with waste by chemical activation with K₂CO₃ [ACLW] and removal efficiency was poor added with commercial activated carbon [AC]. Concentration of Blue79 [2-Bromo- 4,6, dinitroaniline-3-Bis-(2-acetoxyethylene) amino-p-aceto pheneridide] was 40 mg/L.