• Environmental Engineering Research
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• 제21권2호
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• pp.180-187
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• 2016

In the present work, bael shell (aegle marmelos) is used as the feedstock for pyrolysis, using a fixed bed reactor to investigate the characteristics of the pyrolysis oil. The product yields, e.g., liquid, char and gases are produced from the biomass at different temperatures with the particle size of 0.5-1.0 mm, at the heating rate of $150^{\circ}C/min$. The maximum liquid yield, i.e., 36.23 wt.%, was found at $5500^{\circ}C$. Some physical properties of the pyrolysis oil such as calorific value, viscosity, density, pH, flash point and fire point are evaluated. The calorific value of the bael shell pyrolysis oil was 20.4 MJ/kg, which is slightly higher than the biomass, i.e., 18.24 MJ/kg. The H/C and O/C ratios of the bio-oil were found as 2.3 and 0.56 respectively, which are quite higher than some other bio-oils. Gas Chromatography and Mass Spectroscopy (GC-MS) and Fourier Transform Infra-red (FTIR) analyses showed that the pyrolysis oil of bael shell is mostly composed by phenolic and acidic compounds. The results of the properties of the bael shell pyrolysis oil reveal the potential of the oil as an alternate fuel with the essential upgradation of some properties.

• Corrosion Science and Technology
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• 제7권4호
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• pp.193-196
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• 2008

This article briefly tests and analyzes the sulfur content and the distribution of active sulfur in the crude oil of Kurkow Kazakhstan and Siberian Russian, and discusses the relationship between active sulfur content and total sulfur content, active sulfur and corrosion. At the same time, it measures the open circuit potential of X70 steel and X60 steel witch have been immerged in the above two kind of crude oil for a period of time, discusses the sulfur corrosion to metal.

• Korean Chemical Engineering Research
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• 제52권2호
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• pp.154-165
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• 2014

최근 수평시추, 수압파쇄 등의 기술발전에 따라 셰일가스, 셰일오일, 석탄층 메탄가스 등 비전통자원개발이 활성화 되었다. 이러한 기술발전으로 생산성이 향상되었지만, 화학약품이 포함된 수압파쇄 유체와 오일, 가스와 고농도의 염과 방사성 물질을 함유하는 생산수가 가스 생산중 발생하게 된다. 이같이 생성된 대량의 폐수에 따른 부정적인 환경적 요인은 비전통자원개발에 주요 장애요소로 급격히 대두되고 있다. 본 연구에서는 비전통자원개발에 따른 회수수와 생산수의 처리방법에 대한 융합적인 토대를 제시하고, 새롭게 떠오르는 다양한 수처리 기술을 총설하고자 한다. 비전통 자원개발 현장에 적용 가능한 기본적인 분리공정인 막분리, 증발, 결정화, 탈염공정 기술을 소개하고 또한 대량의 수자원을 사용하는 비전통자원개발의 특성상 물의 재이용 및 재활용이 가능한 기술을 소개하고자 한다.

• 자원환경지질
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• 제46권4호
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• pp.359-373
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• 2013

셰일은 입자의 크기가 매우 작은 쇄설성 퇴적물이 고화되어 형성된 퇴적암으로 암석화되는 과정에서 유기물을 잘 보전하는 특성을 가지고 있어 전통적으로 석유나 가스의 탐사 및 개발에서 탄화수소를 생성하는 근원암의 역할을 하였다. 또한 셰일층은 매우 낮은 투과율 때문에 불투과층으로 인식되어 트랩을 형성하는 덮개암의 역할을 하는 것으로 알려져 있다. 하지만 최근 수평채굴과 수압파쇄 등 시추 기술의 획기적인 발달로 북미를 중심으로 셰일층 내에서 막대한 양의 가스를 발견하고 상업적으로 생산함에 따라 셰일을 석유나 가스를 생산하는 지층뿐만이 아니라 탄화수소를 저장하는 저류층으로 새롭게 인식하게 되었다. 셰일층의 지화학 평가 기술은 셰일 내에 함유된 유기물의 특성을 지화학 분석을 통해 파악하여 유기물의 석유 및 가스 생성 능력을 평가하는 기술인데 최근에는 셰일층내에 생성된 가스가 저장되어 있는 셰일 가스층을 평가하고 탐사하는 데에 적용되고 있다. 셰일 가스층을 정확하게 평가하기 위해서는 탄화수소의 생성과 집적 그리고 매장량 예측에 영향을 미치는 지화학적인 과정과 특성을 정확히 이해하는 것이 매우 중요하다. 본 논문에서는 셰일층 내에서 탄화수소 생성 메카니즘을 살펴보고 셰일층 평가 및 특성화에 활용되는 지화학 분석 기술을 고찰하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.1817-1818
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• 2006

In present, most of metallic structures (gas pipeline, oil pipeline, water pipeline, etc) are running parallel with subway in Seoul and Pusan.In this case, subway system make a stray current due to electrical corrosion on metallic structures. The owner of metallic structures has a burden of responsibility for the protection of corrosion and the prevention against big accident such as gas explosion or soil pollution and so on. So, they have to measure and analyze the data about P/S(Pipe to Soil) potential, amplitude of stray current, point of source of stray current and so on. In this paper, results of development about Wireless Remote Monitoring and Control System on Underground Pipeline in Stray Current Conditions are presented. And also field test data should be reporting.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.731-734
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• 2003

In present, most of metallic structures(gas pipeline, oil pipeline, water pipeline, etc) are running parallel with subway and power line in seoul. Moreover subway system and power line make a stray current due to electrical corrosion on metallic structures. The owner of metallic structures has a burden of responsibility for the protection of corrosion and the prevention against big accident such as gas explosion or soil pollution and so on. So, they have to measure and analyze the data about P/S(Pipe to Soil) potential, amplitude of stray current, point of source of stray current and so. In this paper, results of development about data logger apparatus for measurement stray current of subway and power line are presented.

• Journal of Applied Biological Chemistry
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• 제66권
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• pp.15-22
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• 2023

The aim of the present study was to evaluate the chemical composition and antioxidative activity of rhizome essential oil of Kaempferia parviflora Wall. ex Baker. The essential oil extracted by hydrodistillation was chemically profiled by GC/MS analysis. The antioxidative activity was determined and evaluated spectroscopically by the 2,2-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assays. According to the results, the major essential oil components were camphene (18.03%), β-pinene (14.25%), a-pinene (12.38%), endo-borneol (10.23%), β-copaene (8.38%), and linalool (8.20%). K. parviflora rhizome oil possessed antioxidant potential, exhibiting DPPH and ABTS radical scavenging activities as high as 80.90 and 94.04%, respectively, at a concentration of 10 mg/mL. The corresponding IC₅₀ values were 0.451±0.051 and 0.527±0.022 mg/mL, respectively (IC₅₀ values for ascorbic acid, as the standard, were 0.209±0.016 and 0.245±0.022 mg/mL, respectively). The mycelium of F. oxysporum was distorted and collapsed when treated with 0.5 mg/mL of the EO of K. parviflora rhizome for 3 days treatment, which may provide an important information for exploring the metabolism of the fungicide K. parviflora rhizome and its derived compounds against F. oxysporum. This study provides the chemical properties of the essential oil of K. parviflora rhizome grown in Vietnam and their potential antioxidant and antifungal activities.

• Carbon letters
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• 제16권3호
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• pp.183-191
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• 2015

Gas transport through graphene-derived membranes has gained much interest recently due to its promising potential in filtration and separation applications. In this work, we explore Kr-85 gas radionuclide sequestration from natural air in nanoporous graphene oxide membranes in which different sizes and geometries of pores were modeled on the graphene oxide sheet. This was done using atomistic simulations considering mean-squared displacement, diffusion coefficient, number of crossed species of gases through nanoporous graphene oxide, and flow through interlayer galleries. The results showed that the gas features have the densest adsorbed zone in nanoporous graphene oxide, compared with a graphene membrane, and that graphene oxide was more favorable than graphene for Kr separation. The aim of this paper is to show that for the well-defined pore size called P-7, it is possible to separate Kr-85 from a gas mixture containing Kr-85, O₂ and N₂. The results would benefit the oil industry among others.

• 유기물자원화
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• 제16권4호
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• pp.57-63
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• 2008

본 연구에서는 돈분을 이용한 열분해공정(pyrolysis)에 의한 바이오오일의 특성을 분석하여 보고하였다. 기본적으로 bio-oil 생산을 위한 pilot auger형 반응기는 $400^{\circ}C{\sim}600^{\circ}C$의 고온을 유지하였다. 바이오오일의 특성은 수질분석, 열량가, 원소분석, GC/MS를 이용한 마이오일의 원소, $^1H$ NMR분광기에 의한 functional group 구명 등을 포함한다. 돈분시료를 이용한 바이오오일 생산량은 pilot auger 반응기의 온도가 $550^{\circ}C$일 때 바이오일 생산율은 질량의 21%로서 최대를 나타내었다. 이 결과는 본 연구에서 연속 auger형 반응기의 이송이 편리하고 bio-oil 생산량이 적지 않아 대체 축분처리기술의 하나로 검토할 수 있음을 보였다. 그러나 auger 반응기의 원료로의 열전도가 유동상 반응조보다 낮아서 향후 이를 개선하기 위한 연구가 성공적으로 수행되면 바이오오일 생산량을 제고시킬 수 있을 것으로 판단된다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집B
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• pp.818-823
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• 2001

Because the exhaust emissions from automobiles are increased, our environment is faced with very serious problems related to the air pollution in these days. In particular, the exhaust emissions of diesel engine are recognized main cause which influenced environment strong. Lots of researcher have been attempted to develop various alternative fuel on purpose to reduce these harmful emissions. In this study, the potential possibility of esterfied rice bran oil which is a kind of biodiesel fuel was investigated as an alternative fuel for diesel engine. And, we tried to analysis not only total hydrocarbon but hydrocarbon components from $C_1$ to $C_6$ in exhaust gas using gas chromatography to seek the reason for remarkable reduction of exhaust emission. Individual hydrocarbon$(C_1\simC_6)$ as well as total hydrocarbon of biodiesel fuel is reduced remarkably than that of diesel fuel in this experiment.