• 멤브레인
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• 제8권3호
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• pp.138-147
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• 1998

접촉분해 경유에 함유된 유용 방향족 성분(나프탈렌류 성분:탄소수 10-12)의 분리법으로서 추출법과 액막법을 분리성능 면에서 비교했다. 추출법의 용매로서는 dimethylsulfoxide수용액을, 액막법의 막상으로서는 dimethylsulfoxide와 saponin의 혼합수용액을 각각 사용했다. 추출법에서 얻어진 노르말-노난을 기준 성분으로한 나프탈렌류 성분의 선택도는 온도가 낮아짐에 따라 급격히 증가했으나, 액막법에서 얻어진 선택도는 온도에 무관한 경향을 나타내어, 실온에서의 추출법에 의한 나프탈렌류 성분의 선택도는 액막법에서 얻어진 선택도는 온도에 무관한 경향을 나타내어, 실온에서의 추출법에 의한 나프탈렌류 성분의 선택도는 액막법에 비해 컸다. 또, 회분 교반조를 사용하여 두 분리법으로 부터 나프탈렌류 성분의 물질이동속도를 측정한 결과, 추출법의 연속상측 물질이동계수는 액막법의 막상측 투과계수에 비해 약 280배 컸다.

• 대한화학회지
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• 제24권1호
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• pp.34-43
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• 1980

아세토니트릴 용매에 녹은 티안트렌 양이온 자유라디칼 과염소산염과 티오크잔틴을 반응시키면 티안트렌과 티오크잔틴 양이온 라디칼 대신에 티오크잔틸이움 이온이 생성된다. 이 혼합물에 아니솔, 아닐린, N,N-디에틸아닐린, 카테콜, 에틸벤젠 등을 가해 줌으로서 각각 9위치에 치환기를 가진 티오크잔틴을 얻었다. 디벤조-18-크라운-6-에테르, 디페닐수은과 삼페닐포스핀과의 반응에서도 같은 유형의 생성물이 얻어진다. 그러나 전자받게를 가진 방향족 화합물과의 반응은 너무 느리거나 반응이 일어나지 않았다.

• Preventive Nutrition and Food Science
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• 제13권1호
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• pp.18-22
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• 2008

Volatile components in field bean (Dolichos lablab) were collected by simultaneous steam distillation and solvent extraction and analyzed by gas chromatography-mass spectrometry. One hundred and five components were identified including alcohols (32), ketones (18), aldehydes (9), acid (1), alkanes (5), aromatics compounds (4), esters (2), furans (2), naphthalene (1), pyrazines (4), pyridine (3), sulfur-containing compounds (4) and terpenes (7) and miscellaneous compounds (13). Relatively high concentration of n-hexanal found in the field bean might be undesirable to some consumers.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.503-506
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• 2008

Liquid hydrocarbon fuels, such as gasoline, kerosene, diesel and JP 8, can be good candidates for SOFC (solid oxide fuel cell) system fuel due to their high hydrogen density. Autothermal reforming (ATR) is suitable for liquid hydrocarbon fuel reforming because oxygen can decompose the aromatics in liquid fuel and steam can suppress the carbon deposition during catalytic reaction. The advantage of ATR is that it has a simple system construction due to exothermicity of ATR reaction. We control the exothermicity of reaction, make the reaction possible design a self-sustaining ATR reactor. A self-sustained 1kW-class kerosene autothermal reformer is introduced in this paper. The 1kW-class kerosene reformer was continuously operated for about 140 hours without degradation of reforming performance.

• 한국대기환경학회지
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• 제17권2호
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• pp.169-177
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• 2001

The concentrations of ambient volatile organic compounds (VOC) were investigated from the Kwangju area. A total number of sixty six sample were collected and analyzed during day/night periods from June to September 1999. Each of the canister sample ws analyzed for alkane and aromatic compounds using a GC/MSD sys-tem. The concentration of VOC in mean day/night time, when compared, was in the order: toluene(16%)> isobu-tane(14%)= acethylene(14%)> propane(12%)> ethane(11%)> butane(9%). The VOC concentrations were gene-rally higher during the daytime than the nighttime. The VOC with light weight(such as an alkane group, $C_2$-C(suh)5) showed generally higher concentrations during day/nighttime than the VOC with heavy weight (such as an aromatic group). High correlations were among the VOC emitted from the similar sources.

• 한국응용과학기술학회지
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• 제30권3호
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• pp.431-443
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• 2013

Sulfur content of diesel fuel has been cut down to under 10 ppm ULSD (ultra low sulfur diesel) level by environmental regulation with the aim of reducing exhaust emissions. This review discusses the methods and principles of sulfur reduction in diesel and presents an overview of new approaches for ultra-deep desulfurization. The deep HDS (hydrodesulfurization) problems of diesel streams is exacerbated by the inhibiting effect of co-existing aromatics, nitrogen compounds and $H_2S$. The new approaches to deep desulfurization includes non-HDS type processing schemes such as adsorptive, extractive and oxidative desulfurization.

• 제어로봇시스템학회논문지
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• 제14권4호
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• pp.365-368
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• 2008

Feasibility test for radical reactions in organic light emitting diode(OLED) has been applied on OLED consisting of hole transport layer(HTL) and electron transport layer(ETL). Organic molecules such as 4,4',-Bis[N-(1-naphthyl)-N-phenylamino] biphenyl(NPD) and 4,4',4"-tris(3-methylphenylphenylamino)triphenylamine(m-MTDATA) are chosen for hole transport layer(HTL) and Bathocuproine(BCP) for electron transport layer(ETL) in this study. Informations on energy and shape of frontier orbitals and data on radical reactions of simple aromatics from semiconductor($TiO_2$) photocatalysis have provided basis for determining feasibility for radical reactions in OLED. The outcome of our feasibility test would be useful in designing optimum molecule for organic layer with a view to extending the lifetime of OLED.

• 대한화학회지
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• 제25권3호
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• pp.172-176
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• 1981

형상 선택성 ZSM-5 제올라이트 촉매상에서 메탄올로부터 $C_2-C_{10}4의 탄화수소 형성을 조사하였다. 메탄올로 부터 dimethylether를 거쳐 생성되는 $C_2-C_5$의 올레핀들이 ZSM-5의 강한 산점에서 고리화 반응등에 의하여 방향족 화합물이 많이 포함된 탄화수소화합물로 전환된다고 생각된다. 메탄올의 전환반응에 대한 ZSM-5 촉매의 높은 활성과 활성저하에 대한 안정성은 특유의 교차되는 세공관구조와 소수성에 기인하는 것으로 보인다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.67-70
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• 2007

Diesel autothermal reforming has several problems such as carbon deposition in reforming reactor, sulfur poisoning of catalyst, difficulty of aromatics decomposition and mixing problems of reactants(diesel, steam, oxygen). Severe carbon deposition causes the rapid performance degradation of reformer. Carbon deposition is formed from ethylene, carbon precursor. Ethylene was generated at the homogeneous reaction zone of the reactor entrance. This phenomenon is closely linked to the mixing of reactants. In this investigation, we try to minimize the ethylene generation at the reactor entrance atomization technique.

• 환경위생공학
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• 제15권4호
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• pp.44-51
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• 2000

The reactivity of a range of volatile organic compounds with differing functional groups observed over 0.5% $Pt/{\gamma}-Al_2O_3$ catalyst. In general, the reactivity pattern observed was alcohols > aromatics > ketones > cycloalkane > alkanes. The deep conversion was increased as reaction temperature was increased. A correlation was found between the reactivity of the individual and the strength of the weakest C-Hbond in structure. The conversion of volatile organic compounds increases in order methanol > benzene > cyclohexane > MEK > n-hexane. That is the effect of differences in total dissociation energy. An apparent zeroth-order kinetics with respect to inlet concentration have been observed. A simple multicomponent model based on two-stage redox model made reasonably good predictions of conversion over the range of parameters studied. thus, the catalytic process was suggested as the new VOCs control technology.