• Proceedings of KOSOMES biannual meeting
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• 2006.05a
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• pp.103-108
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• 2006

Treatment of O/W Emulsion is very important to develop 15ppm Bilge Separator for new IMO regulation It is too difficult to demulsify the emulsion in the bilge waste water, so we use chemical treatment to break emulsion stability. Broken oil particle is treated by flotation 15ppm Bilge Separator on the Ship doesn't have enough time to treat Bilge waste water because of limited space in the ship. For the solution to this problem, we experiment to find primary factors as coagulant, pH, amount of inputting coagulant, and type of flotation. On the basis of test results, we decided primary factors.

• Applied Chemistry for Engineering
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• v.9 no.2
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• pp.193-199
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• 1998

The mixtures of ultra-high molecular weight polythylene (UHMWPE), high density polyethylene (HDPE), process oil (mineral oil) and potassium hexatitanate whisker were melted and mixed at $150^{\circ}C$ for 30min, and prepared by compression molding to the specimen of separator of about $200{\mu}m$ thickness at the same temperature and 5000 psi. Thereafter the pores were formed by extracting process oil with organic solvents. In this study, the range of PR (the ratio polymer to process oil) was varied from 0.1 to 0.5 because the specimen turned into rubbery phase at which PR was below 0.1 whereas it changed into gel phase at which PR was above 0.5. When the specimen was treated with nonpolar organic solvents, process oil was extracted nearly 98%. Tensile strength was $31kg/cm^2$ at PR = 0.426, and resistance of specimen was $37m{\Omega}/cm^2$ at PR = 0.186, and $53m{\Omega}/cm^2$ at PR = 0.426. The $N_2$ adsorption-desorption isotherm showed a hysteresis representing regions of capillary condensation, and the surface area at PR = 0.186 was relatively large as $130cm^2/g$. Potassium hexatitanate whisker was randomly dispersed in between PE layers. It might be that the whisker is intercalated through the PE thin layers oriented by compression.

• Applied Chemistry for Engineering
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• v.30 no.2
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• pp.141-144
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• 2019

Oil-water separators are commonly used in the oily wastewater treatment for the reuse of water resources. Recently, various approaches have been conducted to design and manipulate the oil-water separator installed with highly functionalized membranes. Membrane technologies should encompass the selectivity, durability, economics and processability of materials, and effective oil water separators be also developed to exhibit the optimal performance of the materials. In this mini-review, we highlight the large scale fabrication of membrane materials and the effective design of oil water separators.

• Clean Technology
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• v.19 no.1
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• pp.30-37
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• 2013

Low-rank coal with high water content (32.3 wt%) was dried by fry drying, and the fuel characteristics of the dried coal from which the oil was separated by using a high-speed centrifugal separator were analyzed. After fry drying for 6 min and 10 min, the water content decreased to 5.0 wt% and 4.2 wt% respectively. The higher calorific value (HCV) of the coal increased remarkably after fry drying, from 11,442.0 kJ/kg-wet. The oil content of the fry-dried coal was 15.0 wt% and it decreased with an increase in the reheating temperature: 9.7 wt% at $80^{\circ}C$ to 9.3 wt% at $100^{\circ}C$, and then to 8.5 wt% at $120^{\circ}C$. The recovered oil could then be reused. According to of thermogravimetric analysis (TGA), there was no difference in the weight loss patterns of the coal samples with different coal diameters at a reheating temperature of $120^{\circ}C$. This was because the amount of oil separated by the centrifugal separator was affected by the reheating temperature rather than the coal diameter. And derivative thermogravimetry (DTG) curves of raw coal before the fry-drying process, a peak is formed at $400^{\circ}C$ in which the volatile matter is gasified. In case of the fry-dried coal, the first peak is generated at $350^{\circ}C$, and the second peak is generated at $400^{\circ}C$. The first peak is caused by the oil that is replaced with the water contained in the coal during the fry-drying process. Further, the peaks of the coal samples in which the oil is separated at a reheating temperature of $80^{\circ}C$, $100^{\circ}C$, $120^{\circ}C$, respectively are smaller than that of the coal in which the oil is not separated, and this is caused by that the oil is separated by the centrifugal separator.

• Korean Chemical Engineering Research
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• v.54 no.6
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• pp.800-805
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• 2016

Rapid growth in nanotechnologies promises novel benefits through the exploitation of their unique industrial applications. However, as the production volume of nanomaterials increases, their unintentional exposure to the environment has been occured. Potential impacts of nanoproducts on the environment can be evaluated in the life cycle assessment (LCA). LCA is the systematic analysis of the resource usages and emissions over the life time from the primary resources to the moment of disposal. In this study, we performed LCA for fabrication processes of superhydrophilic oil/water separator using nano-$TiO_2$. $TOTAL^{TM}$ freeware was used to analyze for all fabrication processes, and 6-environmental impact factors (resource depletion, climate change, ozone depletion, acidification, eutropication, and photochemical oxidation) were introduced. In addition, the use of nano-$TiO_2$ in the fabrication of superhydrophilic oil/water separator was actively contributed to the environmental impact factors, compared to the bulk-$TiO_2$.

• Proceedings of the KAIS Fall Conference
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• 2011.12b
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• pp.593-595
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• 2011

본 논문은 전산해석을 통하여 일반적으로 가솔린엔진에 적용되는 오일분리기의 성능을 분석하였다. 현재 상용화된 제품을 해석한 결과 Labyrinth부분에서는 포집 능력이 거의 없는 것을 확인하였다. 오일입자 포집효율이 전체적으로 분포되지 않고 5개의 작은 홀이 있는 격판 부분에서만 집중적으로 나타나는 것을 확인하였다. 또한, 일반적인 Cyclone형태의 오일분리기보다 압력강하량이 높은 것을 확인할 수 있었다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1585-1588
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• 2003

Based on the design requirements for the rubber-tired AGT light rail vehicle. the braking system was designed. Its major components are a brake operating unit, a pneumatic-hydraulic transfer, screw compressor, oil separator. air dryer, hydraulic caliper. After the components of braking system were manufactured. some factory tests were executed to evaluate their performances. The Results of these tests can guarantee a performance. safety of the braking system developed.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1254-1257
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• 2007

본 연구에서는 유류-유사 분리기내에서 유체의 흐름거동을 상용 3차원 수치모형인 FLOW-3D를 이용하여 해석하였다. 유류-유사 분리기는 도심지의 우수로 인한 유출발생시 동반되는 이물질을 여과시키는 기능을 가진 지하구조물이다. 우수로 인한 유출이 발생하여 유류-유사 분리기내로 흘러들어오는 유입수는 3차원적 거동을 하고 다양한 흐름특성을 갖는다. 따라서, 분리기내에서의 흐름거동을 정확히 해석하는데 많은 어려움이 있다. 본 연구에서는 정류판(baffle)과 유류흡착기(oil skimmer)로 구성된 유류-유사 분리기에서의 유류와 유사를 포함하고 있는 유출수의 복잡한 거동을 해석하기 위해 수치모의를 실시하였다. 유류와 유사에 대한 포착률(oil and grit trap)은 유류-유사 분리기내에서 유체의 흐름거동과 관계된다. 따라서, 본 연구에서는 유류와 유사의 포착률을 향상시키기 위한 수치모의의 기초적인 단계로서 유류-유사 분리기내에서 유류흡착기(oil skimmer)를 설치한 경우와 설치하지 않은 경우에 대한 유체의 흐름거동을 FLOW-3D를 이용하여 3차원 수치모의를 실시하였다. 수치모의를 통해 유류흡착기의 유무에 따른 유류-유사 분리기내에서의 흐름거동을 알 수 있었으며, 유류흡착기를 설치한 경우엔 유류 흡착기에 의해 여과될 수 있는 유류와 유사에 대한 각각의 포획률이 높아짐을 알 수 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.10
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• pp.1835-1841
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• 2006

Demand of enhanced bilge separation sensor system has been recently increased due to the severe regulation reinforcement of MEPC(Marine Environment Production Committee). Up to date bilge separation sensor has to be extremely accurate and highly reliable. To design and build such a bilge separator. a precise oily water separation level sensor that distinguishes oil from water is critical. Three dimensional simulations have been carried out to figure out the characteristics of capacitive level sensors, which grounds the finding of the parameters required to design the sensors. The parasitic capacitance problem which is inherent to capacitive level sensors has been taken care of. This paper concludes with the future research direction that can be pursued with the newly defined parameters of the capacitive level sensors.

• Applied Chemistry for Engineering
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• v.30 no.1
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• pp.39-42
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• 2019

We report on the design of oil-water separators and the selection of materials for the effective application of highly selective membranes fabricated by commercial PET (polyester) fabrics. The waterproof ability of PET fabrics was optimized to improve the separation selectivity. The density of individual PET fabrics should be over $60g/m^2$, and the multi-layered structure is more favorable for the waterproof ability together with maintaining the removal efficiency. For the continuous adsorption and removal process, the rotating perforated cylinder was selected, and covered with membranes. Furthermore, more improved and stable removal efficiency was obtained by installing floating baffles which forces the oil content to move toward membranes.