• 대한약학회:학술대회논문집
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• 대한약학회 2001년도 Proceedings of the Pharmaceutical Society of Korea
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• pp.108.1-108.1
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• 2001

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2011년도 춘계학술논문집 1부
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• pp.489-492
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• 2011

Supercritical fluid technology has been an alternative for purification and separation of biological compounds in cosmetic, food, and pharmaceutical products. Solubility information of biological compounds in supercritical fluids is essential for choosing a supercritical fluid processes. The equilibrium solubility of hinokitiol was measured in supercritical carbon dioxide with a static method in the pressure range from 8 to 40 MPa and at temperatures equal to 313.2, 323.2 and 333.2 K. The experimental data were correlated well by Peng.Robinson equation of state and quasi-chemical nonrandom lattice fluid model.

• 한국염색가공학회지
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• 제31권1호
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• pp.48-64
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• 2019

With evolution in the production environment of the textile industry, the need for non-water-based dyeing technologies and eco-friendly process facilities in the dyeing and processing stages has increased. In recent years, supercritical fluid dyes have been developed and commercialized in Europe, centering on this demand. However, so far, such dyes have been mainly applied in the processing of PET fibers. Basic research has mainly involved investigation of dyeing by supercritical carbon dioxide or solubility of such dyes, and more in-depth research should be continuously carried out. In this review, we describe the types and characteristics of supercritical fluids that exhibit specific properties at pressures and temperatures over the critical point. In addition, the state of the art in the dyeing and processing technology using supercritical fluids and associated, processing problems, environmental regulation, and wastewater treatment issues are described in detail. We hope this review can contribute to the supercritical fluid technology being further developed as an environment friendly dyeing processing method. Furthermore, we expect that the technique can be used as a means of ensuring different, high-quality dyed products.

• KSBB Journal
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• 제20권5호
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• pp.329-337
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• 2005

Because of their unique properties, supercritical fluids have been known as one of the most promising materials for the future technology. Supercritical fluid technologies have been widely applied to various operations such as extraction, impregnation, nano-particle generation, oxidation, reaction etc. Industrial applications, especially their successful usage of supercritical fluid, have been reviewed. A special case for the first successful industrial application of supercritical $CO_2$ extraction in Korea was reviewed. Its unique characteristics of enriched antioxidant, $'\grmma-tocopherol'$ enabled this industrial application in Korea in spite of its low market price. Also its size and operation conditions were known as world records.

• 분석과학
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• 제5권2호
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• pp.153-158
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• 1992

본 연구에서는 이동상 성질이 GC와 HPLC와는 전혀 다른 초임계 유체 크로마토그래피(SFC)를 사용함으로써 종래의 크로마토그래피의 방법으로는 분석하기 힘든 물질을 분석하는 방법을 개발하였다. GC로는 분리하기 힘든 긴 고리를 가진 Hydrocarbons이나 Mink Oils, Soybean oils 등이 SFC로 잘 분리될 수 있었다. 그 이유는 SFC에서는 시료가 갖고 있는 낮은 기화성이나 열에 불안정한 점 등이 이동상을 초임계 상태의 이산화탄소를 사용함으로써 극복되어질 수 있었다. 이 연구에서는 한걸음 더 나아가 극성이 강한 지방산 및 농약류를 분석하는 방법을 개발함으로써 SFC의 가장 큰 약점인 극성이 있는 시료의 처리 문제를 극복하고자 시도하였다.

• Nuclear Engineering and Technology
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• 제40권2호
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• pp.133-138
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• 2008

The use of Supercritical Fluids(SCF) has been proposed for numerous power cycle designs as part of the Generation IV advanced reactor designs, and can provide for higher thermal efficiency. One particular area of interest involves the behavior of SCF during a blowdown or depressurization process. Currently, no data are available in the open literature at supercritical conditions to characterize this phenomenon. A preliminary computational analysis, using a homogeneous equilibrium model when a second phase appears in the process, has shown the complexity of behavior that can occur. Depending on the initial thermodynamic state of the SCF, critical flow phenomena can be characterized in three different ways; the flow can remain in single phase(high temperature), a second phase can appear through vaporization(high pressure low temperature) or condensation(high pressure, intermediate temperature). An experimental facility has been built at the University of Wisconsin to study SCF depressurization through several diameter breaks. The preliminary results obtained show that the experimental data can be predicted with good agreement by the model for all the different initial conditions.

• 한국분말재료학회지
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• 제10권1호
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• pp.6-14
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• 2003

The purpose of the present study is to investigate the method decreasing debinding time as well as lowering operation condition than pure supercritical $CO_2$ debinding by using cosolvent or binary mixture of propane + $CO_2$. First method is to add cosolvent, such as n-hexane, DCM, methanol, 1-butanol, in supercritical $CO_2$. In case of adding cosolvent, we were found the addition of non-polar cosolvent (n-hexane) improves dramatically the binder removal rate (more than 2 times) compared with pure supercritical $CO_2$ debinding, second method is to use mixture of supercritical propane + $CO_2$, as solvent. In case of using mixture of supercritical propane + $CO_2$, the rate of debinding speeded up with increasing of pressure and concentration of propane at 348.15 K. It was found that addition of cosolvent (e.g., n-hexane, DCM) and binary mixture propane + $CO_2$ for supercritical solvent remarkably improved binder removal rate for the paraffin wax-based binder system, in comparison with using pure supercritical $CO_2$.

• 자원리싸이클링
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• 제23권3호
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• pp.71-77
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• 2014

초임계 유체공정 및 반응상용화에 의한 불융/불용성 폐플라스틱 재활용은 다양한 분야에서 응용이 가능하며, 고부가가치의 신제품생산과 연계하여, 국내 유화산업의 국제 경쟁력 확보가 가능하다고 판단된다. 본 연구에서는 초임계유체를 이용하여 불융/불용 폐플라스틱의 자원순환기술에 대한 특허와 논문을 분석하였다. 분석범위는 1993년에서 2012년까지의 미국, 유럽연합, 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였으며, 기술의 정의에 의해 필터링하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술 등에 따라 분석하여 고찰하였다.

• 한국세라믹학회지
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• 제37권7호
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• pp.625-631
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• 2000

In this study, the characteristics and sinterablities of TiO2 powders which were fabricated on sol-gel process and supercritical fluid process were examined. The powders fabricated on sol-gel process were amorphous. The particle size and shape were changed with the amount of water used for hydrolysis of titanium ethoxide. The powders were changed from amorphous to crystalline by heating at 400℃. The crystalline anatase TiO2 powders were directly prepared in ethanol supercritical fluid condition that temperature was 270±3℃ and pressure was 7.3 MPa. It's primary crystalline size was 20 nm and agglomerated as spherical shape whose size was 0.7∼1㎛. The powders prepared on sol-gel process were not sintered densely at 900℃ because of abnormal grain growth. However, the powders which prepared on supercritical fluid process were sintered densely at the comparatively low temperature of 800℃ by ideal growth of grain, which are fired at 900℃.

• Korean Chemical Engineering Research
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• 제40권6호
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• pp.715-718
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• 2002

폴리에스터의 염색공정에서 발생하는 폐수문제를 근원적으로 해결하기 위해서 초임계 유체를 이용한 건식염색기술이 관심의 대상이 되고 있다. 본 연구에서는 반 유통형인 초임계유체 평형실험장치를 이용하여 초임계 상태의 HFC-134a에 대한 분산염료인 C. I. disperse red 60의 용해도를 382.2 K와 413.2 K의 온도와 50, 70, 100, 130, 160 bar의 압력에서 측정하였다. 초임계유체를 고압의 액체로 간주하는 확장액체모델에 측정된 데이터들을 상관하면 실험값과 계산값이 잘 일치하였다.