Young-Kwan Lim

The SIMDIST (Simulated Distillation) Analysis of Distributing Engine Oil

The vehicle lubricant occupies upto 35% in a total lubricant market and engine oil occupies upto 77% in the vehicle lubricant market in Korea. A suitable quality management of the circulating engine oil is necessary for driver and engine protection. But, KS and synthetic engine oil products (involved over 30% synthetic oil) are exempt to any quality management under Petroleum and Alternative Fuel Business Act. It is also known that synthetic oils such as PAO (poly alpha olefin) have excellent properties and performance like anti-wear, varnish control and oxidation stability than those of mineral oils. For this reason, PAO has been used for an engine oil, rotary screw and reciprocating compressor in addition to heavy duty and other extreme service applications. In this study, our research group analyzed the chromatogram pattern for the mineral oil, PAO and mineral oil involved a typical ratio of PAO using SIMDIST (simulated distillation). In the SIMDIST chromatogram, the mineral oil showed a broad peak, while PAO showed a sharp typical peak. Also the oil with a large viscosity grade exhibited a long retention time due to the heavy molecular weight and high boiling point. In particular, the blended mineral oil with 20% PAO sample showed a distinctly different pattern compared to that of using the conventional mineral oil. For monitoring PAO contents in distributing engine oils, we analyzed the SIMDIST for 27 kinds of engine oils which were popularly sold in Korea. The analytic results indicate that all kinds of engine oils showed that PAO contents were below 20% in engine oil products. Moreover, the PAO titled product was found to have a small amount of PAO. Thus, we conclude that the related laws for the proper quality management of synthetic oils are needed to be established.

A study on the evaluation of metal component in automatic transmission fluid by vehicle driving

요약 자동변속기유는 자동차의 자동변속기의 성능을 유지시키기 위해 사용되는 유체이다최근 자동차 제조. 사에서는 일반적으로 자동변속기유를 주행후 교환 또는 무교환을 보증하고 있지만 국내에80000~100000 km 서는 많은 운전자들이 이하에서도 자동변속기유를 교환하고 있는 것으로 조사되었다빈번한 50000 km . 자동변속기유의 교환은 환경오염과 차량유지비용을 상승시키는 원인으로 작용되고 있다 . 본 연구에서는 사용하지 않은 신유와 와 를 각각 주행한 뒤 회수된 자동변속기유를 50000 km 100000 km대상으로 인화점연소점유동점동점도저온겉보기점도전산가금속분과 같은 물리적 특성을 분석하였, , , , , , 다연구결과신유에 비해 사용유는 전산가유동점금속분이 증가되는 것을 확인하였지만두 종류의 사용. , , , , 유 의 물리적 특성과 금속분 함량의 차이는 크지 않음을 알수 있었다(50000 km, 100000 km) . : , , , , , 주요어 자동변속기유교환주기유도결합플라즈마신유사용유금속분Abstract - Automatic transmission fluid (ATF) is used for automatic transmissions in the vehicle as the characterized fluid. Recently, the vehicle manufacture usually guarantee for fluid change over 80000~100000 km mileage or no exchange, but most drivers usually change ATF below every 50000 km driving in Republic of Korea. It can cause to raise environmental contamination by used ATF and increase the cost of driving by frequently ATF change.In this study, we investigate the various physical properties such as flash point, fire point, pour point, kinematic viscosity, cold cranking simulator, total acid number, and metal component concentration for fresh and used ATF after driving (50000 km, 100000 km). The result showed that the total acid number, pour point, Fe, Al and Cu component had increased than fresh ATF, but 2 kind of used oil (50000 km and 100000km) had similar physical values and metal component concentration

Analytic Study of Lubricity of DME as Alternative Fuel

In recent years, there have been increased concerns for the global warming and the exhaustion of resources caused by the heavy consumption of the fossil fuel. For this reason, biomass has been brought to great attention as a renewable source of energy to mitigate the situation. In this particular area, DME (dimethyl ether) fuel produced from biomass, biogas, and coal is expected to be useful as one of the eco-friendly synthetic fuel alternatives to petrodiesel. Diesel engine need fuel lubricity due to their severe condition (high pressure and temperature) but DME have low lubricity. In this study, we developed the analytic system for DME lubricity test which is pressurized chambered tester. Also we synthesized various of biodisel from 12 kinds of vegetable oil under base catalyst system. Oxygen compounds definitely contributed to the natural lubricity of fuel, biodiesel have ester group which is polar oxygenated functional group. After prepared test system and biodiesel as lubricant, we analyzed the lubricity of neat DME, neat biodiesels and DME-lubricant blended (100 ppm to 2000 ppm) fuel.Copyright