• Title/Summary/Keyword: 증류성상

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Study on Characteristics of Change of Physical/Chemical Property in Domestic Aviation Fuel by the Quality Monitoring Analysis (국내 항공유(Jet A-1) 품질모니터링을 통한 물성 변화 특성 연구)

  • Doe, Jin-woo;Youn, Ju-min;Jeon, Hwa-yeon;Yim, Eui-soon;Lee, Joung-min;Kang, Hyung-kyu
    • Journal of the Korean Applied Science and Technology
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    • v.35 no.4
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    • pp.1327-1337
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    • 2018
  • Aviation fuel oil is more strictly controlled than other transport fuels because it can lead to major accidents in the event of a problem. The quality standards of the aircraft are specified by the domestic Korean Standard, the American Society for Testing and Materials and the International Air Transport Association, respectively. From 2016 to 2017, the quality analysis of 6 items such as aromatic content, sulfur content and distillation characteristics was carried out on the jet fuel produced at five domestic refineries. Domestic production of jet fuel has been shown to be in conformity with the quality standards and has been maintained at a constant level throughout the year. Compared with the specification of ASTM and IATA the aromatic content of domestic KS specification is set to be strictly 1.5 wt% higher than the ASTM and IATA setting specification, but it satisfies this specification sufficiently. In addition, other items such as sulfur content, distillation property and flash point satisfied both domestic and international specification.

Quality property of bioethanol blends & counterplan of infrastructure (바이오에탄올 혼합가솔린 품질특성 및 유통인프라 대응)

  • Jung, Choong-Sub
    • New & Renewable Energy
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    • v.2 no.4 s.8
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    • pp.102-106
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    • 2006
  • 에탄올은 금속, 고무 수지를 부식시키고 열화시키기 때문에 FFV 등 알코올 대응차량이 아닌 경우 에탄올 허용도가 제한되고 있으며, 물과의 상호용해성과 흡습성으로 수분혼입에 의한 상분리가 발생하여 혼합가솔린의 유통에서의 취급에 어려움이 야기되고 있다. 또한, 에탄올은 가솔린과 혼합되면 공비현상으로 인하여 50% 유출온도가 크게 떨어지고 증기압이 7kPa 정도 상승을 초래하는 점도 간과하지 않을 수 없다. 따라서, 자동차용휘발유에 에탄올을 혼입하여 사용할 경우, 가솔린기재를 적절히 선택하여 적정품질을 유지하여야 하며 무엇보다도 에탄을 혼입농도에 따른 저장탱크와 주유기 등의 부품에의 영향과 저장시의 상분리 문제를 충분히 규명하여 유통인프라에서의 적절한 대응책이 마련되어져야 한다. 유통 인프라 대응을 위해서는 우선 생산단계에서 수분 혼입을 최소화하기 위하여 저유소의 출하지점에서 서브옥탄가솔린과 에탄올을 라인브랜딩에 의해 제조하는 방법이 가장 타당하며, 수송부문에서는 탱크로리 등의 공급라인인 파이프와 실링 재질 등에 대해서 면밀한 검토가 필요하다고 할 수 있다. 주유소에서의 대응은 에탄을 혼합연료와 직접 접촉하는 연료계 등 부품재질을 내부식성의 재질로 변환시켜야 하며, 수분혼입을 최소화하기 위한 이중탱크 설치, 지하탱크 환기구내의 대기벨브 설치 등이 필요하며, 기타, 품질 및 수분관리 대책 등도 마련되어야 할 것이다.

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Liquefation Characteristics of Polypropylene by Low-Temperature Pyrolysis by using Co and Mo Dispersed Catalysts under time and loading variations (Co 및 Mo 분산촉매 반응시간과 농도 변화에 따른 PP의 저온열분해 액화특성)

  • Park, Jun-Gyu;Lee, Bong-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.32 no.2
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    • pp.281-289
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    • 2015
  • This study investigated the conversion of oil products from polypropylene by using dispersed Co and Mo catalyst on reaction time and concentration change for knowledging liquefation characteristics at low-temperature (425, 450 and $475^{\circ}C$) pyrolysis in a batch reactor. The reaction time was set in 20~80 minutes and the oil products formed during pyrolysis were classfied into gas, gasoline, kero, diesel and heavy oil according to the domestic specification of petroleum products. The pyrolysis conversion rate was showed as Mo catalyst > Co catalyst > Thermal in all reaction time at reaction temperature $450^{\circ}C$. The conversion rate and yields of the pyrolysis products were the most height when Co and Mo Catalyst ratio was 50:50.

Characteristic Analysis of GTL Fuel as an Automobile Diesel (자동차용 경유로서 GTL의 연료특성분석)

  • Lim, Young-Kwan;Shin, Seong-Cheol;Kim, Jong-Ryeol;Yim, Eui-Soon;Song, Hung-Og;Kim, Dongkil
    • Applied Chemistry for Engineering
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    • v.19 no.6
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    • pp.617-623
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    • 2008
  • GTL (gas-to-liquid) fuel produced by the Fischer-Tropsch reaction of carbon monoxide (CO) and hydrogen ($H_2$) is expected to be one of the environmental friendly biomass based alternatives and blended to petrodiesel. In this study, the characteristic of the fuel was analyzed by its concentration differences after blending petrodiesel in domestic market with different amounts of GTL fuel which produced from Shell. Gas chromatography shows that GTL fuel consists of longer paraffin chain than common diesel. GTL fuel showed a high flash point, distillation, kinematic viscosity, and derived cetane number. In addition, GTL fuel showed lower lubricity due to low sulfur content.

A Impact Study on Combustion Characteristics of the Engine by Changing the Gasoline Properties (휘발유 물성변화가 엔진의 연소특성에 미치는 영향 연구)

  • Noh, Kyeong-ha;Im, Sang-bin;Lee, Min-ho;Kim, Ki-ho;Ha, Jong-han
    • Journal of Energy Engineering
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    • v.24 no.4
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    • pp.166-174
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    • 2015
  • This study examined combustion characteristics by selecting the fuel which have a different physical properties compared to gasoline in order to examine the effects of vehicle performance and environment depending on the physical properties. The experiment examined the combustion characteristic in the optimum ignition timing according to the physical properties change and the lean burn by performing control about ignition timing and air-fuel ratio for each fuel, and it was also evaluated the exhaust gas according to the experiment. We used a single-cylinder engine for the experiment, and tested for gasoline properties change by selecting a fake fuel that beyond the fuel quality standards in 석대법. As a result, in the case of the selected fuel showed a difference in Octane and distillation characteristics, vapor pressure and it was also found to unstable combustion, and leads to a large amount of harmful exhaust gas.

Characteristics of Flexibacter columnaris Isolated from Tilapia (Tilapia sp.) (틸라피아(Tilapia sp.)에서 분리한 Flexibacter columnaris의 성상)

  • Chun, Seh-Kyu;Sohn, Sang-Gyu
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.18 no.4
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    • pp.369-373
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    • 1985
  • The characteristics of a pathogen isolated from infected tilapia, which showed the external symptoms of fin erosion and body deceleration, were examined. The strain of isolated pathogen was identified as Flexibactor columnaris, The normal tilapia dipped into suspensions of the isolated pathogens has developed the infective symptoms. The strain of Flexibactor columnaris was sensitive to kanamycin, tetracycline, and amikacine, but resistant against sulfa drugs. This strain could not grow in the cytophaga media containing over $2\%$ NaCl or over $50\%$ sea water. In cytophaga broth containing more than $50\%$ or sea water instead of distilled water, the number of Flexibacter columnaris decreased from about $10^6/ml\;to\;10^4ml$ within one hour after inoculation. On the other hand, in cytorhaga broth containing more than $5\%$ of NaCl, the number rapidely reached less than 10/ml from about $10^5/ml$ within one hour after inoculation.

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Liquefaction Characteristics of ABS-polyethylene Mixture by a Low-Temperature Pyrolysis (ABS-Polyethylene 혼합물의 저온 열분해 특성평가)

  • Choi, Hong-Jun;Jeong, Sang Mun;Lee, Bong-Hee
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.223-228
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    • 2012
  • The low-temperature pyrolysis of ABS, polyethylene (PE) and an ABS-polyethylene (ABS-PE) mixture was conducted in a batch reactor at $450^{\circ}C$. The conversion and the product yield were measured as a function of the reaction time with a variation of the mixture composition. The oil products formed during pyrolysis were classified into gas, gasoline, kerosene, gas oil and heavy oil according to the petroleum product quality standard of the Ministry of Knowledge Economy. The pyrolysis conversion increases with an increase in the content of PE. The yield of the pyrolytic products was ranked as heavy oil>gas>gasoline>gas oil>kerosene as the content of PE in the mixture increases.

A study on the characteristics of fuel performance according to the oxygenated additive type for gasoline fuel Part 1. Fuel properties and evaporative emission characteristics (휘발유 연료용 함산소 첨가제 종류에 따른 성능 특성 연구 Part 1. 연료물성 및 증발가스 배출 특성)

  • Lee, Min-Ho;Kim, Jong-Ryeol;Kim, Ki-Ho;Ha, Jong-Han
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.1
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    • pp.118-128
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    • 2016
  • As the interest on the air-pollution is gradually rising up at home and abroad, automotive and fuel researchers have been working on the exhaust emission reduction from vehicles through a lot of approaches, which consist of new engine design, innovative after-treatment systems, using clean (eco-friendly alternative) fuels and fuel quality improvement. This research has brought forward two main issues : exhaust emission and PM (particulate matter) particle emissions of gasoline vehicle. Exhaust emission and PM particle of automotive had many problem that cause of ambient pollution, health effects. In addition, researcher studied the environment problems of the MTBE contained in the fuel as oxygenate additives. The researchers have many data about the health effects of ingestion of MTBE. However, the data support the conclusion that MTBE is a potential human carcinogen at high doses. Based on the oxygenated fuel additive types (MTBE, Bio-ETBE, Bio-ethanol, Bio-butanol), this paper discussed the influence of oxygen contents on gasoline fuel properties and evaporative emission characteristics. Also, this paper assessed the acceleration and power performance of gasoline vehicle for the fuel property.

The Study on Characteristics of Polystyrene by Low Temperature Pyrolysis by using Co and Mo Dispersed Catalysts (Co 및 Mo 기반 촉매에 의한 폴리스티렌의 저온 열분해 특성에 관한 연구)

  • Park, Jun-Gyu;Kim, Jae-Kon;Lee, Bong-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.4
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    • pp.676-685
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    • 2016
  • This study investigated the conversion of oil products from polystyrene by using dispersed Co and Mo catalyst on reaction time and concentration change for knowledging on characteristics at low temperature (425, 450 and $475^{\circ}C$) pyrolysis and reaction time(20~80 min, 15 min interval) in a batch reactor. It will be showed the conditions for optimum pyrolysis at reaction temperature $450^{\circ}C$ and the reaction time 35min, and the main components of the converted liquid oil were styrene and benzene derivatives by GC/MS. The oil products formed during pyrolysis were classified into gas, gasoline, kero, diesel and heavy oil according to the domestic specification of petroleum products. The pyrolysis conversion rate was showed as Co catalyst > Mo catalyst > Thermal in all reaction time at reaction temperature $450^{\circ}C$. The yields rate of gas, kerosine, diesel were the most hight at Mo Catalyst, gasoline was at thermal and heavy oil was at Co catalyst. The conversion rate and yields of the pyrolysis products were the most height when Co catalyst ratio was 100%.

Necessity of Quality Control for Aviation Fuel(Jet A-1) to Secure Aviation Safety (항공안전 확보를 위한 항공유(Jet A-1) 품질관리 필요성)

  • Junbeom Heo;Yumi Kang;Heejin Lee
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.30 no.2
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    • pp.194-199
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    • 2024
  • Accidents due to aircraft fuel defects rank in the top 13 of the 34 accident types described by CAST-ICAO Common Taxonomy Team(CICTT). Aircraft accidents occur because of the inflow of moisture or pollutants depending on the distribution process and storage environment. To confirm the change in physical properties of the aircraft oil stored for a long time, we stored JET A-1 aircraft oil in a metal can to observe the change after six months. We confirmed that the aircraft oil stored for a long time satisfied the quality standards, and the stability of the fuel oil was high. However, in scenarios in which aircraft oil is stored separately on ships, onshore storage facilities, oil fields, etc., owing to the nature of missions, such as in marine police aircraft, the inflow of moisture or pollutants may likely occur due to changes in the internal and external environment. In addition, pollutants can be analyzed using existing tests and distillation properties, but for moisture, domestic and international standards and domestic laws determine the moisture separation ability of aircraft oil through the water separation index, but the moisture content is not analyzed. Therefore, aviation safety must be secured by adding quality control standards for moisture content and performing revisions to uniformize domestic and international standards and laws.