• Applied Chemistry for Engineering
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• v.29 no.5
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• pp.630-634
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• 2018

The recovery of paraffin components contained in the fraction as a part of improving the quality for the fraction of waste plastics pyrolysis oil (WPPO) was investigated by batch cocurrent 4 stages equilibrium extraction. The fraction at a distilling temperature of $120-350^{\circ}C$ recovered from WPPO by the simple distillation and a little water-added dimethylformamide (DMF) solution were used as a raw material and solvent, respectively. As the number of equilibrium extraction (n) and the carbon number of paraffin component increased, the concentration of paraffin component contained in the raffinate increased. The concentrations of $C_{12}$, $C_{14}$, $C16$ and $C_{18}$ paraffin components present in the raffinate recovered at n = 4 were about 1.2, 1.5, 1.6 and 1.8 times higher than those of using the raw materials, respectively. Recovery rates (residue rates present in raffinate) of paraffin components rapidly decreased with increasing n, and increased sharply with increasing the carbon number. Furthermore, it was possible to predict the recovery rates at n = 1 - 4 for all paraffin components ($C_7-C_{24}$) contained in the raw material. The raffinate recovered through this study is expected to be used as a renewable energy.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.10 no.3
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• pp.127-136
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• 1990

In this paper, the experimental study was carried out for the removal of olive oil in wastewater by the use of Biological Fluidized Bed(BFB) with the reticulated polypropylene sheets as media. The nonbiodegradable olive oil, one of the animal and vegitable oil, was used bacause of the relative simplicity of constitution. Biological degraciability and removal characteristics of emulsified olive oil were studied by batch and continuous experiments respectively. From the results of batch experiments, it was observed that the emulsified olive oli used in BFB reactor was absorbed by media and sludge in about 12 hours, and degradation of the absorbed olive oli was mostly completed for 24 hours. The functional relationship of Michaelis-Menten's Enzyme reaction equation exists between oil concentration and maximum specific rate of olive oil. From the continuous experiments for the removal of olive oil using BFB reactor, it was proved that the substrate removal rate coefficient $k=0.004d^{-1}$, which is the first order kinetics. It was apperared that oxygen utlization coefficients for synthesis(a') and endogeneous respiration(b') of microorganisms in the reactor are respectively 0.85mg $O_2/mg$ $COD_{cr}$ and 0.011mg $O_2/mg$ BVS. day.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.1
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• pp.1-10
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• 2000

An experimental study regarding the effect of emulsions on RO is presented. Heavy oil was added to the sea water and the distilled water separately and treated for 30 minutes by a homogenizer to make emulsions. For the case of the sea water without heavy oil the permeate decreased from the beginning of the experiment. Chloride and conductivity increased with time, due to the fouling occurring as the suspended solids in the sea water accumulated on the membrane surface. Rejection rate of salt was 99.6~99.7%. As for the sea water containing heavy oil, the permeate decreased slowly from the beginning of the experiment. This result was the same for the case of the sea water only. However. chloride and conductivity increased significantly when heavy oil was added. In the second experiment with sea water containing heavy oil, the operation time of RO was reduced considerably. With addition of oil, the chloride increased greatly, while the permeate reduced comparatively. In the experiment where emulsion of $0.3{\sim}0.8mg/{\ell}$ was supplied to RO. oil concentration was about 10ppb in the permeate at the end of the experiment. In case of the distilled water containing heavy oil. the conductivity increased. However. the permeate reduced to 30% compared to the case of the sea water containing heavy oil. The case of sea water containing heavy oil showed an opposite result, but the effect of the addition of oil on RO was significant. Oil caused fouling of the RO and the contamination of the whole system, and as the result the system could not be operated properly. As a result the membrane capacity, the amount and water quality of permeate deteriorated significantly.

• Applied Chemistry for Engineering
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• v.30 no.2
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• pp.155-159
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• 2019

As a part of improving the quality for the fraction of the waste plastics pyrolysis oil (WPPO), the recovery of paraffin components contained in the fraction was investigated by dimethylformamide (DMF) equilibrium extraction. The fraction of a distilling temperature of $120{\sim}350^{\circ}C$ recovered from WPPO by the simple distillation and the aqueous solution of DMF were used as a raw material and solvent, respectively. The concentrations of paraffin components ($C_{12}$, $C_{14}$, $C_{16}$ and $C_{18}$) contained in the raffinate decreased by increasing the mass fraction of water in the solvent at an initial state ($y_{w,0}$), whereas, the concentrations of paraffin components contained in the raffinate increased by increasing the mass ratio of the solvent to the feed at an initial state $(S/F)_0$. The concentrations of $C_{12}$, $C_{14}$, $C_{16}$ and $C_{18}$ paraffin components present in the raffinate recovered at $(S/F)_0=10$ were about 1.37, 2.0, 2.46 and 3.16 times higher than those of the raw materials, respectively. Recovery rates (residue rates present in raffinate) of paraffin components rapidly increased with increasing $y_{w,0}$, and decreasing $(S/F)_0$. The raffinate recovered through this study was expected to be used as a renewable energy.

• Proceedings of the KSCN Conference
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• 2004.05a
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• pp.413.2-414
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• 2004

본 연구는 건강피부를 유지, 관리하기 위한 기초 자료를 수립하기 위하여 외견상 건강하고 일상 활동을 유지하는 131명의 여대생을 대상으로 안면 피부유형별 신체지수 및 스트레스의 차이를 비교하였다. 피부유형은 전체안면 피부 유분량으로 판정하고 피부유형별 신체계측, 체성분 구성, 비만정도, 체형 및 스트레스정도의 차이는 SPSS11.0 (for Win)을 이용하여 분석하였다.(중략)

• Korea Petroleum Association Journal
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• no.8 s.30
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• pp.66-71
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• 1983

이 자과는 최근 일본의 통산소 산하의 석유심의회석유부회에서 의결된 석유심의회석유부회소위원회의 보고서로서, 이 보고서는 석유산업 구조개편의 현황을 진단하고, 이를 토대로 앞으로의 방향을 제시하고 있다. 이 보고서는 구체적으로 석유산업이 스스로 자주적이면서 적극적으로 과잉시설을 처리하고, 원매의 집약화와 주도회사의 설립을 추진하며, 중간유분 의 안정공급확보와 환리스크대책등을 마련할 것을 건의하고 있다. <편집자 주>

• Korea Petroleum Association Journal
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• no.4 s.14
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• pp.56-57
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• 1982

세계적인 원유의 중질화 추세와 소비의 경질화 추세라는 이율배반적인 현상하에서 중질유 분해기술에 대한 연구가 활발히 진행되고 있다. 아래에 소개하는 것은 일본 통산성 "공업기술원"이 연구하고 있는 중질유을 원료로 하는 올레핀 제조법과 "중질유 대책기술연구조합"의 「중질유분해기술 」이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.5
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• pp.1109-1114
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• 2009

The order to see how the deep cleansing change sebum and moisture condition by skin type, 20 persons with dry skin and oily skin were divided into two groups of scrub group and enzyme group and given the deep cleansing care, totaling 8 time. After 8 times of the deep cleansing care, the scrub group showed a valid change with oily skin while the enzyme group showed a valid change with dry skin. However, both groups did not have change a moisture with any skin types. The outcome from the questionnaire that had been done to find subjective feeling indicated that oil change resulted in a valid feeling whereas change of moisture and sensitivity were barely felt.

• Journal of Convergence for Information Technology
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• v.9 no.6
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• pp.211-217
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• 2019

In this study, the change of skin condition was analyzed by skin analysis equipment using scrub cosmetics, and the morphological characteristics of microbead were observed by dermascope and scanning electron microscope. In the dermascope observation, during the process of cleansing, the microbeads attached to the skin existed in close contact with each other or dispersed. The skin after scrubbing was clean and smooth and the fine wrinkles between epidermal keratinocytes were reduced. In the scanning electron microscopic observation, the microbead surface did not have severe bending or rough surface. The skin moisture and oil content were higher than the scrub skin before the scrub, and there was no significant difference in the pH.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.3
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• pp.225-228
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• 1989

Under the different conditions of planting density, maturation dates, stem length, oil contents, stem yield and seed yield of flax were investigated in 1984. The results were as followed: Wiera and Storment Goss were earlier in the maturation dates with increasing plant density, However Taijungsung #1 was delayed. Though there is a difference between the varieties stem length was getting longer with increasing plant density., Oil contents were getting higher with increasing plant density, stem yield and seed yield were increased with increasing plant density, on the contrary those were decreased by the growth of ciliary flax in the case of 1200 plants per 1.2m$^2$. Therefore optimum planting density of flax culture was 12cm x 6cm.