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Soybean Sludge 로부터 Tocopherol 을 농축하기 위한 초임계 유체 추출공정 기초연구
박영훈,이흔,정봉현 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.2
초임계 탄산가스를 이용하여 soybean sludge에 함유된 17-l8wt% tocopherol을 농축할 수 있는 추출공정을 개발하기 위한 기초연구로 sterol 성분이 제거된 soybean sludge와 초임계 탄산가스계의 용해도 및 연속적 추출실험을 온도범위 45-70℃와 압력범위 200-400 bar에서 수행하였다. 각 온도에서 추출물내의 tocopherol 농도는 250 bar에서 가장 낮았고 300 bar 근처에서 cross-over point가 나타났다. 이 결과를 토대로 sterol 제거된 soybean sludge의 tocopherol을 농축하기 위하여 일반적인 연속식 역류 추출법이 적절히 이용될 수 있음을 확인 하였다. A fundamental study has been carried out to develop the extraction process for concentration 17-18 wt% tocopherols from soybean sludge using supercritical carbon dioxide. In this regard, the equilibrium solubility and continuous extraction experiments for the system sterol-removed soybean sludge and supercritical carbon dioxide were performed over the temperature and pressure ranges of 45-70℃ and 200-400 bar, respectively. Tocopherol concentration in the extract was the lowest at 250 bar for all temperatures studied and the cross-over point was appeared in the vicinity of 300 bar. On the basis of these results, it was confirmed that a general countercurrent extraction method can be properly used for the concentration of tocopherols from sterol-removed soybean sludge.
Seo, Young-ju,Park, Seongmin,Kang, Hyery,Ahn, Yun-Ho,Lim, Dongwook,Kim, Se-Joon,Lee, Jaehyoung,Lee, Joo Yong,Ahn, Taewoong,Seo, Yongwon,Lee, Huen Elsevier 2016 APPLIED ENERGY Vol.178 No.-
<P>A replacement technique has been regarded as a promising strategy for both CH4 exploitation from gas hydrates and CO2 sequestration into deep-ocean reservoirs. Most research has been focused on replacement reactions that occur in sI hydrates due to their prevalence in natural gas hydrates. However, sII hydrates in nature have been also discovered in some regions, and the replacement mechanism in sII hydrates significantly differs from that in sI hydrates. In this study, we have intensively investigated the replacement reaction of sII (C3H8 + CH4) hydrate by externally injecting CO2/N-2 (50:50) gas mixture with a primary focus on powder X-ray diffraction, Raman spectroscopy, NMR spectroscopy, and gas chromatography analyses. In particular, it was firstly confirmed that there was no structural transformation during the replacement of C3H8 + CH4 hydrate with CO2/N-2 gas injection, indicating that sll hydrate decomposition followed by sI hydrate formation did not occur. Furthermore, the cage-specific replacement pattern of the C3H8 + CH4 hydrate revealed that CH4 replacement with N-2 in the small cages of slI was more significant than C3H8 replacement with CO2 in the large cages of sII. The total extent of the replacement for the C3H8 + CH4 hydrate was cross-checked by NMR and GC analyses and found to be approximately 54%. Compared to the replacement for CH4 hydrate with CO2/N-2 gas, the lower extent of the replacement for the C3H8 + CH4 hydrate with CO2/N-2 gas was attributable to the persistent presence of C3H8 in the large cages and the lower content of N-2 in the feed gas. The structural sustainability and cage-specific replacement observed in the C3H8 + CH4 hydrate with external CO2/N-2 gas will have significant implications for suggesting target gas hydrate reservoirs and understanding the precise nature of guest exchange in gas hydrates for both safe natural gas production and long-term CO2 sequestration. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Lee, Huen,Kang, Seong Pil,Lee, Yoon Young,Lee, Hoon Wu 한국화학공학회 1996 NICE Vol.14 No.1
The vapor-liquid equilibrium data of the binary CFC, HCFC, and FC mixtures were correlated with the Soave-Redlich-Kwong equation of state incorporated with some types of mixing rules the conventional one fluid, Panagiotopoulos-Reid and modified Huron-Vidal second order mixing rules. the Panagiohtpoulos-Reid mixing rule showed the superiority to the other models in predicting the VLE of freon mixtures with low errors. the modified Huron-Vidal second order model showed good convergence ability, which was due W is robustness to parameter variation.