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RISS 인기검색어
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- 저자 : 주창식 (검색결과 144 건)
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주창식 釜山工業大學校 1979 論文集 Vol.20 No.-
In order to obtain the basic data for mass transfer processes in liguid-gas system, study on the bubble formation from single orifice were performed. In this study, following results were obtained. 1) Even in very low gas flow rate, V/d value is not constant. 2) Up to concentration of 336.3mg S.L.S/ℓH2O, the ratio of obtained V/d to theoretical one increase with increasing concentration of S.L.S. 3) Volumes of bubbles fromed can be calculated by following equation D/d=1.787(σ/gd2ρL)0.357
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제주 화산석으로부터 합성한 Na-A 제올라이트에 의한 Cu 이온의 흡착 특성
주창식,이창한,이민규,Ju, Chang-Sik,Lee, Chang-Han,Lee, Min-Gyu 한국환경과학회 2018 한국환경과학회지 Vol.27 No.5
The adsorption characteristics of Cu ions were studied using the zeolite Na-A synthesized from Jeju volcanic rocks. The effects of various operating parameters such as initial concentration of Cu ions, contact time, solution pH, and solution temperature were investigated in batch experiments. The adsorption of Cu ions by Na-A zeolite was fitted well by pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity determined using the Langmuir isotherm model was 152.95 mg/g. In addition, the adsorption of Cu ions by zeolite Na-A was primarily controlled by particle diffusion model in comparison with the film diffusion model. As the temperature increased from 303 K to 323 K, ${\Delta}G^o$ decreased from -2.22 kJ/mol to -3.41 kJ/mol, indicating that the adsorption of Cu ions by Na-A zeolite is spontaneous process.
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지지막을 이용하는 회분 액막 추출기에 의한 수용액 중의 아연이온 분리
주창식,천재기,하홍두 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.1
지지막을 이용하는 회분 액막 추출기를 사용하여 수용액 중의 아연이온을 분리하였다. 액막 추출기는 액막과 두 개의 수용액상(추출상과 회수상)으로 구성된다. 액막으로는 D₂EHPA를 케로신에 30 vol%로 희석시킨 용액을 사용하며, 두 장의 미세공을 가진 친유성 지지막에 의해 양측의 두 수용액상과 격리된다. 추출상으로는 pH를 조절한 아연 수용액을 사용하였고, 회수상으로는 황산 수용액을 사용하였다. 이 액막 추출기는 수용액 중의 아연이온을 지속적이고 효과적으로 분리하였다. 아연의 분배계수와 추출기 내에서의 아연이온 분리속도에 미치는 조작변수들의 영향을 실험적으로 조사하였으며, 이를 바탕으로 초기 분리속도와 조작변수 사이의 실험식을 얻었다. Separation of zinc ion from aqueous solutions by batch liquid membrane permeator with two micro-porous films was studied. The permeator consisted of a liquid membrane and two cells for aqueous solutions. The liquid membrane consisted of D₂EHPA(di-2-ethylhexyl-phosphoric acid), diluted to 30 vol% with kerosine and trapped between two micro-porous hydrophilic films, as the carrier. This liquid membrane separated two aqueous solutions, one of which was the extraction solution containing zinc ion and the other of which was the stripping solutions consisting of H₂SO₄solution. The permeator separated zinc ion from aqueous solutions effectively. The effect of operating parameters on the distribution coefficient of zinc ion and separation velocity of zinc ion were examined on the basis of the experimental results.
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주창식,박흥재,정갑섭 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9
For the purpose of surveying any possibility of anchoring titanium dioxide on activated carbons to promote their activities as catalysts and/or adsorbents, two activated carbons were oxidized with ammonium peroxydisulfate and followed by anchoring titanium dioxide. The anchoring of titanium dioxide on the oxidized activated carbons were performed via the adsorption of tetrabutyltitanate, hydrolysis with deionized water, and calcination. The effect of oxidizing and anchoring treatment on the surface element composition, surface area, and pore texture were analyzed by XPS, BET and TPD. The oxidation of activated carbons with ammonium peroxydisulfate introduced carboxyl groups on the surface of activated carbons and these carboxyl groups promoted the anchoring of titanium oxide on the activated carbons. However, the treatments affected the surface area and the porosity of activated carbons.
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Micronization and characterization of drug substances by RESS with supercritical CO2
주창식,Jung-Teag Kim,Hong-Lyong Kim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
A RESS (rapid expansion of supercritical solution) process for the preparation of ultra-fine drug particles with no organic solvent has been developed with supercritical CO2. Three drug substances with different solubility in supercritical CO2 were used, and orifice disks and capillary tubes were adapted as an expansion device. The solubilities of drug substances in supercritical CO2 and the effects of various operating parameters on the characteristics of the particles prepared by RESS process were experimentally investigated. The solubility of the drug substance in supercritical CO2 had a major effect on the average diameter of the particle prepared by RESS process, and the particle diameter decreased with the solubility for all the drugs and operating conditions. The particle diameter also decreased with preexpansion temperature and increased with the hole diameter of the orifice nozzle and aspect ratio (L/D) of the capillary tube.
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