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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.
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.
추체외로 증상을 나타낸 간경변 환자에서 담창구 부위의 자기공명 신호증강과 혈중 망간농도와의 상관성
백일현,김병호,김경진,김효종,최우석,장린,이정일,동석호,장영운,이동근,한요셉,장대일 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.1
Backgroud/Aims : Increasing evidence suggests that manganese deposition in globus pallidus is responsible for MRI signal hyperintensity and for extrapyramidal symptoms in cirrhotics. However, the relationships between blood manganese, the severity of liver dysfunction, the pallidal signal intensity, and neurological signs have not been well established. Methods: Blood manganese concentrations were measured together with brain MRI and neurological evaluation in six controls, six patients with Parkinson's disease with normal liver function, and fourteen cirrhotic patients with hepatic encephalopathy including six cirrhotics with extrapyramidal symptoms. The neurological state was evaluated using the Columbia scale and the pallidal index (PI). The ratio of globus pallidus to frontal subcortical white-matter signal intensity was measured-multiplied by 100. Results : Pallidal signal hyperintensity was observed in 85.7% of cirrhotics, and the PI was higher in cirrhotics with extrapyramidal signs or high grade varices than those without them, but there was no increase in the Parkinson's disease patients. No correlations were demonstrated between the blood manganese level and PI as well as the Child-Pugh score. The blood manganese level was not significantly different between cirrhotics and other groups. However, there was an overt increase only in two cirrhotic patients with extrapyramidal signs. The Columbia scale did not reveal any correlations with the blood manganese level and the Child-Pugh score. Conclusions: Cirrhotics with extrapyramidal signs showed a significant increase in PI, but there was no increase in the patients with Parkinson's disease. The PI was not significantly correlated with the blood manganese level. These findings suggest that extrapyramidal signs in cirrhotics might be caused by a different mechanism than those in Parkinson's disease, which could possibly be related with manganese. (Korean J Hepatol 2000;6:24-32)
육골 폐기물 재활용을 위한 파쇄 및 포장 시스템의 개발
백일현 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
Wasted meat & bone has generated as byproducts in the slaughtering process of livestock and also faced with demands for its recycling and environmental protection. Many studies have been conducted to recycle byproducts and carried out mainly on the crushing of bones and the vacuum packing technology of products. In this study, the crushing unit, transporting unit, separated unit and packing unit have designed fordevelopment of the crushing and packing systems. Also, to confirm the performance of this system, the experimental verification were carried out the working noise and packing weight.