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초임계 n - Pentane 용매를 이용한 상압잔사유로부터 중질 탄화수소오일의 추출에 관한 연구
백일현,김춘호,김성현,김영일,홍성선 ( Il Hyun Baek,Choon Ho Kim,Sung Hyun Kim,Young Il Kim,Sung Sun Hong ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
Supercritical extraction of residual oil was performed using n-pentane as a supercritical solvent. The amount of asphaltene, metal complex and sulfur contents of extracted oil as well as the oil-extraction yield were investigated during this experiment. Oil-extraction yield was increased as the system pressure was increased and the temperature was approached to the critical temperature of n-pentane. The metal complex content of extracted oil was much decreased when compared with that of residual oil, however, the sulfur content of extracted oil was slightly decreased when compared with that of residual oil.
Continuous feeding system 을 이용한 상압 잔사유로부터 탈아스팔트오일 분리
백일현,김춘호,김성현,김영일,홍성선 ( Il Hyun Baek,Choon Ho Kim,Sung Hyun Kim,Young Il Kim,Sung Sun Hong ) 한국공업화학회 1993 공업화학 Vol.4 No.3
석유 잔사유 중 고부가가치를 가진 윤활기유와 같은 중질 탄화수소를 얻기 위하여 펜탄 용매를 이용하여 상압 잔사유로부터 탈아스팔트오일을 분리하였다. 분리실험결과 상압 관사유의 분리수율은 펜탄 용매의 밀도에 좌우됨을 보였으며, 임계영역에서 증가되었다. 또한 분리오일 중 금속성분은 시료인 상압 잔사유와 비교할 때 많은 양이 제거되었으나, 황성분의 제거율은 상대적으로 낮았다. Separation of deasphalted oil from atmospheric residue using n-pentane as a solvent was carried out to obtain the valuable heavy hydrocarbon products that can be used lube base oil. After separation experiments, it is shown that the separation yield of oil from atmospheric residue was dependent on n-pentane density and increased in the critical region of n-pentane. Also, the metal content of separated oil was much lowered when eompared with that of atmospheric residue. However, there`s slight differences in sulfur removal between above two cases.
자동차 브레이크 제동시 디스크의 열적거동 및 응력 특성에 관한 연구
백일현,Baek, Il-Hyun 한국트라이볼로지학회 2012 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.28 No.5
Disc brakes and brake linings are part of the braking system in automobiles; this system works due to the braking power between the disc and pad. Vehicle braking systems have complex environments due to the geometry of the disk and pad, the material properties, the braking conditions, etc. Braking energy is converted into thermal energy during the braking process, due to the frictional heat between the disc brake and pad. This heat is changed to a heat flux, which affects the thermal stress of the disc. The purpose of this study was to use the fluid dynamics software ANSYS CFX to investigate the inner flow characteristics of the air and the heat transfer of the disc, and to analyze the effects on the thermal stress of the disc brake.
초임계 공정을 이용한 석유잔사유로부터 경질 탄화수소의 추출
백일현,김춘호,김동식,김성현,홍성선,이동규 ( Il Hyun Baek,Choon Ho Kim,Dong Sik Kim,Sung Hyun Kim,Song Sun Hong,Dong Kyu Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.2
초임계 공정으로 석유잔사유로부터 경질 탄화수소를 추출하기 위하여 펜탄 용매를 이용하였다. 온도 및 압력의 변화에 따른 추출 특성을 조사하기 위하여, 추출실험을 온도 483K, 503K 및 523K에서, 압력 4.4㎫∼12.0㎫에서 수행하였다. 추출수율은 시스템 압력이 증가함에 따라, 펜탄 용매의 초임계 영역에서 임계온도로 접근할수록 증가하였다. 또한 임계밀도 이하에서 급격한 추출수율 감소는 액-액과 같은 시스템에서 기-액과 같은 시스템으로 이동하기 때문이라 예측된다. 추출유의 GC 분석결과 초기 추출물은 비교적 경질 화합물을 포함하고 있으나, 추출시간이 경과함에 따라 탄소수 분포는 중질 탄소수로 이동하고 있음을 나타내었다. Supercritical extraction of light hydrocarbon from residues remaining after distillation of crude oil, has been carried out by n-pentane solvent. In order to investigate the extraction characteristics upon the variation of temperature and pressure, the experiments were performed at 483K, 503K and 523K with pressure range from 4.4㎫ to 12.0㎫, respectively. The extraction yield has shown to be increased with the system pressure and the temperature approaching down to critical state of n-pentane from the supercritical region. A drastic fall down exhibited in yield under critical density may be stemmed from a phase transition from liquid-liquid-like system to a liquid-vapor-like system. GC analysis of extracted oil revealed that the earlier extracts contain relatively lighter compounds, and the carbon number distribution of the extract has shifted toward the heavier carbon number with lapse of operation time.
백일현,김춘호,민병우,황종식,홍성선 ( Il Hyun Baek,Choon Ho Kim,Byoung Moo Min,Jong Sic Hwang,Song Sun Hong ) 한국공업화학회 1997 공업화학 Vol.8 No.2
펜탄용매를 이용하여 상압잔사유로부터 고급 경질 탄화수소의 추출실험을 수행하였다. 추출공정 계산에 앞서 복잡한 혼합물로 구성된 상압잔사유의 진비점을 계산하기 위하여 모사증류방법을 이용하였다. 추출공정 계산절차를 간단히 하기 위하여 재분류 방법을 이용하여 많은 성분을 포함하고 있는 상압잔사유를 성상이 유사한 몇 개의 가상성분으로 분류하였다. 상압잔사유-펜탄계 추출공정의 모사는 등온 플래시 방법에 기초를 두고 있으며, 계산과정 중 기상과 액상에서의 퓨개시티 계수를 계산하기 위하여 Pang-Robinson 상태방정식을 이용하였다. 복잡한 계산과정을 포함하고 있는 추출공정 모사에 비하여 실험치는 계산치와 잘 일치하였다. Extraction of valuable light hydrocarbon from atmospheric residue using pentane as a solvent has been carried out. The SIMDIS was used to calculate the true boiling point of atmospheric residue containing complex components before the modeling of the extraction process could be performed. In order to simplify the procedure, modeling was adopted and a lumping method was used, such that a large number of compounds were divided into similar component classes called pseudocomponents. The modeling of the extraction process of the atmospheric residue-pentane system was based on the isothermal flash calculation, and the Peng-Robinson equation of state was used to calculate the fugacity coefficient of vapor and liquid phase during calculation steps of modeling. The agreement between the experiments and the calculations was reasonable considering the uncertainties involved in modeling such complex processes.
백일현(Il-Hyun Baek),정재연(Jae-Youn Jung),김신(Shin Kim) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Tribology, in other words, interacting surfaces in relative motion, is essential in life. The relative motion on surfaces may cause some problems with heat, vibration, noise, and so on. Unwanted vibrations by friction, which may arise during the operation of machines, are costly in terms of reduction of performance and service life. All these phenomena inolve stick-slip. The telescopic boom operations involves stick-slip oscillations like slideways. Unwanted stick-s oscillations on telescopic boom operations cannot achieve smooth sliding and many developers of that machine makes a lot of effort to remove or reduce it. So this paper presents stick-slip oscillation with pressure of the hydraulic cylinder which drives booms, and attempts a theoretical approach for the numerical analysis for its stick-slip condition.
백일현 ( Il Hyun Baek ),김종혁 ( Jong Hyeok Kim ),백광호 ( Gwang Ho Baik ),한태호 ( Tae Ho Hahn ),박현주 ( Hyun Ju Park ),박상훈 ( Sang Hoon Park ),박충기 ( Choong Kee Park ) 대한내과학회 2002 대한내과학회지 Vol.63 No.5
Esophageal tuberculosis is rare, with only 30 cases previously reported in the English literature. Pulmonary tuberculosis is still endemic in Korea, but esophageal tuberculosis, especially primary esophageal tuberculosis, is very rarely seen. Patients usually present with progressive dysphagia or odynophagia. A case of esophageal tuberculosis in an 43-year-old male is presented massive hematemesis. Endoscopy showed exposed vascular mass lesion with oozing blood in the mid-esophagus. The patient died of massive hematemesis despite endoscopic and surgical intervention.(Korean J Med 63:591-595, 2002) Key Words : Esophagus, Hematemesis, Tuberculosis
백일현(Il Hyun Baek),김병호(Byung Ho Kim),김태형(Tae Hyung Kim),동석호(Seok Ho Dong),김효종(Hyo Jong Kim),이정일(Joung Il Lee),장영운(Young Woon Chang),장린(Rin Chang),김명재(Myung Jae Kim),이주희(Ju Hie Lee) 대한내과학회 2000 대한내과학회지 Vol.59 No.1
Omental leiomyosarcomas are rare intra-abdominal tumors. This report describes a case of primary leiomyosarcoma of the greater omentum. A 76-year-old female complained of palpable abdominal mass which was revealed to be a primary omental tumor by means of UGI, small bowel series, abdominal ultrasonography, and computed tomography. Upon laparotomy, no metastatic focus was found and a part of tumor was found adhered to gastric serosa. Total omentectomy including the mass was performed. Histological examinations of the tumor confirmed a diagnosis of leiomyosarcoma. At 36 months postoperatively, there is no sign of tumor recurrence or metastasis.(Korean J Med 59:69-73, 2000)
이온성 액체 이산화탄소 포집을 위한 이온성액체의 기술 개발 방향 및 동향
백일현 ( Il Hyun Baek ),정순관 ( Soon Kwan Jeong ),박기태 ( Ki Tae Park ) 한국공업화학회 2013 공업화학전망 Vol.16 No.1
화석연료 사용으로부터 발생되는 이산화탄소는 지구 온난화를 유발시키고 있으며 이를 저감하기 위한 방법으로 이산화탄소 포집 및 저장 기술이 이용되고 있다. 본 기술 중 이산화탄소 포집은 대부분의 처리비용을 차지하고 있어 이에 대한 혁신적인 기술개발이 필요하다. 이온성액체는 화학적 안정성, 낮은 부식성, 낮은 증기압, 높은 이산화탄소 용해도 등으로 인한 차세대 이산화탄소 흡수제로 대두되고 있다. 따라서 선진국을 중심으로 집중적인 연구가 수행되고 있으며 국내에서 많은 연구가 수행되었다. 본 고에서는 이산화탄소 포집용 흡수제로 부각되고 있는 이온성 액체에 대한 국내외 연구개발 방향 및 동향에 대하여 살펴보고자 한다.