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흡착제 향류흐름효과를 주는 다탑압력스위흡착 공정의 성능해석
신흥수,서성섭 ( Heung Soo Shin,Sung Sup Suh ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.6
Process performance of a multi-bed pressure swing adsorption(PSA) process to simulate a countercurrent flow of adsorbent for separation of a binary gas mixture was analyzed theoretically. A multi-bed PSA cycle was simplified to an one-bed cycle in order to reduce difficulties in simulation. Material balances were formulated in gas and adsorbent phases under the assumption of linear isotherms for components and isothermal operation. The mass transfer within an adsorbent was described by linear driving force model. The system considered in this study was nitrogen production from air by carbon molecular sieve. Process performance was examined in view of productivity and recovery, and was related to the fraction of bed utilization for oxygen. The effect of complete and incomplete regeneration during a purge step on performance was investigated respectively. Process performance increases or decreases as the number of bed increases depending on the operating conditions and has a close relation with a fraction of bed utilization for oxygen.
고석태(Suk Tai Ko),신흥수(Heung Soo Shin) 대한약학회 1977 약학회지 Vol.21 No.1
Intravenous injection of Mori Radicis Cortex Water Extract (MWE) regularly caused the dose-related, lowering of blood pressure in the rabbits anesthetized with urethane, and then did not show the cumulative effect and the tachyphylaxis. The hypotensive effects of MWE were inhibited by atropine, chlorisodamine, phentolamine and bethanidine, while not altered by diphenhydramine, propranolol and cyproheptadine. Atropine after chlorisondamine did not alter the effect of MWE. MWE potentiated the pressor effect of norepinephrine, but did not influence the pressor effect of angiotensin. The pressure risen by carotid occlusion was inhibited by previous administration of MWE. It is concluded that MWE elicits hypotensive action in the rabbit by the centrally induced cholinergic effect and the inhibition of responses to sypathetic adrenergic nerve activation.
분리기술 열역학 : 수소 정제를 위한 다탑 PSA 공정의 해석
장동근(Dong Geun Jang),신흥수(Heung Soo Shin),김종남(Jong Nam Kim),조순행(Soon Haeng Cho),서성섭(Sung Sup Suh) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
Numerical simulation for hydrogen-recovery multibed PSA process was performed by orthogonal collocation method for the feed mixture gas of hydrogen, carbon dioxide, carbon monoxide, and methane in petrochemical plant. A fourbed and nine-step process using a layered-bed which was consecutively packed with two different adsorbents in one bed was employed to produce high-purity hydrogen. The packing ratio of zeolite to activated carbon affected the purity and recovery of the product. The optimum length of zeolite layer and that of activated carbon layer were 60 ㎝ each. The optimum adsorption pressure and feed velocity could be determined to be 19 atm and 11.0 ㎝/s, respectively, for the given packing ratio. The recovery and purity of the product were strongly affected by Difference-Pressure(DP) which was defined as the difference between the initial high pressure and the final low pressure at the cocurrent blowdown step which delivers purge gas to the low pressure bed. When the DP was larger than 1.3atm, the purity did not change much and the recovery was continuously decreased with increasing DP. As DP increased, the pressure at the pressure-equalization cocurrent depressurization step was lowered and the pressure at the pressure-equalization countercurrent pressurization step following purge step was also lowered. Therefore, the amount of the high-pressure product to pressurize the low-pressure column increased.
전기 방사법을 통해 제조된 Poly(L-Lactide-co-ε -caprolactone)Marine Collagen 나노파이버의 특성 및 세포친화력 평가
김우진(Woo Jin Kim),신영민(Young Min Shin),박종석(Jong Seok Park),권희정(Hui Jeong Gwon),김용수(Yong Soo Kim),신흥수(Heung So Shin),노영창(Young Chang Nho),임윤목(Youn Mook Lim),정무상(Moo Sang Chong) 한국고분자학회 2012 폴리머 Vol.36 No.2
본 연구의 목적은 전기방사법을 사용하여 poly(L-lactide-co-ε-caprolactone) (PLCL)과 marine collagen (MC) 이 혼합된 나노섬유를 제조하는 것이다. 전기방사된 나노섬유의 직경과 형태는 여러 공정 변수에 의해서 변화되 는데, PLCL과 MC의 혼합비, 노즐과 콜렉터와의 거리, 노즐의 직경, 용액의 방출 속도 그리고 전기장의 세기 변 화에 따라 나노파이버의 직경을 주사전자현미경을 통해서 분석하였다. 또한 제조된 나노파이버의 표면변화를 확인하기 위해 물과의 접촉각을 측정하였으며, 나노파이버의 세포 친화성을 평가하기 위해 MG-63을 이용하여 생존율과 흡착형태를 주사전자현미경과 형광현미경을 통해서 관찰하였다. 이와 같은 연구 결과, 방사거리, MC 의 함량, 전기장의 세기가 증가할수록 제조된 나노파이버의 평균직경은 감소하는 경향을 나타냈다. 또한 MC의 함량이 증가할수록 나노파이버의 친수성이 증가하였고 세포독성은 관찰되지 않았다. 이에 따라 해양유래 생물 에서 추출한 콜라겐은 조직공학용 소재에 새롭게 사용될 수 있을 것으로 예상된다. The uniform nanofibers of poly(L-lactide-co-ε-caprolactone) (PLCL) with different contents of marine collagen (MC) were successfully prepared by electrospinning method. The effects of the major parameters in electrospinning process such as tip to target distance (TTD), voltage, nozzle size and flow rate on the average diameter of the electrospun nanofiber were investigated in generating composite nanofiber. The diameter and morphology of the nanofibers were confirmed by a scanning electron microscopy (SEM). Also, we measured a water contact angle to determine the surface wettability of the nanofibers. The average diameter of the nanofibers decreased as the value of TTD, MC contents, and voltages increased in comparison with that of pristine PLCL nanofiber. In contrast, the diameter of the nanofibers increased as the flow rate and inner diameter of nozzle increased in comparison with that of pristine PLCL. In addition, the hydrophilicity of the nanofiber and attachment of MG-63 cells on the sheets increased as incorporated collagen contents increased. Therefore, the marine collagen would be a potential material to enhance cellular interactivity of synthetic materials by mimicking the natural tissue.