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임종주,Eun-kyung Kang,Jong-mok Park,Ho Cheol Kang,Byung Min Lee 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
In this study, cationic surfactants having mono-, di-, and tri-amminium groups were synthesized by the condensation reaction of alkyl glycidyl ether and alkyl amine followed by the quarternization with dimethyl sulfate. The structure of the product was elucidated by 1H NMR and FT-IR. The minimum surface tension achieved using C12-BHDM surfactant was around 28.88 mN/m, which suggests that C12-BHDM can be used to reduce the surface tension of primarily aqueous formulations and to act as emulsifiers. Dynamic surface tension measurement using a maximum bubble pressure tensiometer indicated that much longer time was required to reach an equilibrium value presumably due to the low mobility rate of a surfactant molecule with high molecular weight. The interfacial tensions measured between 1 wt.% surfactant solution and n-decane were found to be in the same order of magnitude as those exhibited between micellar solutions and nonpolar hydrocarbon oils. It has been observed that the results for foam stability measurement are consistent with those of CMC and contact angle. That is, the percentage of foam volume decrease has been observed to increase with an increase in number of ammonium and hydroxyl groups.
임종주,이의수 동국대학교 산업기술환경대학원 1996 산업기술논총 Vol.3 No.-
The removal of trihalomethanes (THM) by air stripping was examined. Experimental variables studied for air stripping were air flow rate, initial THM concentration, and residence time. In batch aeration experiments, CHCl_3 rejection level was found to increase with an increase in air flow rate., residence time and temperature. In continuous aeration experiments, both rejection levels of CHCl_3 and CHBr_3 increased with an increase in air flow rate. For the maximum air flow rate used (air-to-water ratio=20), about 75% or the initial CHCl_3 was removed by aeration whereas only about 40% of the initial CHBr_3 was removed under the same experimental conditions. When doubling the residence time in each experiment, rejection levels of CHCl_3 and CHBr_3 were shown to be increased by a factor of 1.8 and 1.2 respectively. The CHCl_3 removal level was affected by its intial concentration and the effect was found to become more significant as higher air-to-water ratios were used during aeration. On the other hand, CHBr_3 removal was not greatly affected by the initial CHBr_3 concentration. Preliminary experimental results suggested that aeration could be an effective method for the removal of the more volatile THM component, CHCl_3 but some other method such as carbon adsorption must be accompanied in order to obtain a substantial removal of the less volatile THM component, CHBr_3.
Propylthiouracil에 의한 중증 급성간염 1예
임종주,심미령,이명수,김태현,오석규,안선호,박무림,김남호,박병현,조성구 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.2
PTU에 의한 간염의 발생은 매우 드물게 발생하는 것으로 알려져 있으나 저자들은 Graves씨 병으로 진단 받고 propylthiouracil 투여를 받고있던 환자에서 중증의 급성 간염이 발생한 1예를 경험하였기에 보고하는 바이다. Propylthiouracil is widely used to treat patients with hyperthyroidism. This drug has been associated with severe hepatotoxicity rarely. We presented the case of jaundice and profound liver dysfunction from a 23-year old woman treated with propylthiouracil for hyperthyroidism. Viral, metabolic, and autoimmune liver disease could be excluded and liver biopsy revealed a pattern of acute hepatitis. After discontinuing the drug, there was a progressive resolution of hepatic symptoms and decrease in biochemical data of the liver. Despite propylthiouracil induced hepatitis in rare case, patients receiving propylthiouracil are exposed to develope severe hepatotoxicity. Therefore it might be advisable to monitor level of the transaminase on regular base from patients receiving propylthiouracil.
임종주 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
The effect of oils and hardness on stability of foams made from solutions containing 0.01 wt% of three EO alcohol ethoxysulfate sodium salt of commercial anionic surfactant Neodol 25-3S was investigated. When dissolved calcium was present under alkaline conditions using Na2CO3 instead of NaOH as a pH regulator, solid CaCO3 precipitated. It was found in the absence of oil that CaCO3 particles did not destabilize foam, in contrast to those of the more hydrophobic calcium oleate. The rate of collapse of a foam column was also measured for foams generated from alkaline solutions of an anionic surfactant Neodol 25-3S containing dispersed drops of n-hexadecane, triolein, or mixtures of these oils with small amounts of oleic acid. Oils were added in increments up to oil to surfactant ratio of 1 on a weight basis and the hardness and pH of the aqueous solutions were fixed at 300 ppm and 9 respectively. It was found that triolein has almost no defoaming effect, but the defoaming effect of hexadecane was evident. The same trend was found with mixtures of n-hexadecane/triolein with addition of small amounts of oleic acid. The results of foam stability measurement in the presence of oil could be understood in terms of entry, spreading and bridging coefficients, i.e., ESB analysis. Moreover, as the initial concentration of carbonate ions increased, foam stability was greatly improved for both hexadecane/oleic acid and triolein/oleic acid oils. Evidently, CaCO3 precipitated preferentially, reducing the number of calcium ions available to form calcium oleate. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
고지 재활용을 위한 부유부상 공정에서의 계면 특성이 탈묵 효율에 미치는 영향에 관한 연구
임종주,손종석 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
부유부상법에 의한 신문 고지 탈묵 과정에서 계면활성제, pH, 첨가한 전해질의 농도 및 종류가 탈묵 효율에 미치는 영향을 살펴보았다. 음이온 계면활성제 시스템에서는 산성이나 알칼리 조건에서 첨가한 상대 이온이 잉크 입자와 기포 표면의 음이온 전하를 중화시킴으로써 전기적 반발력을 감소시켜 잉크 제거 효율이 증가하였으며, 음이온 계면활성제와 비이온 계면활성제를 혼합하여 사용한 경우에는 pH감소에 따라 잉크 제거 효율이 감소하였다. 음이온 계면활성제와 혼합 계면활성제 시스템에서 첨가한 전해질 종류와 농도에 따른 탈묵 효율을 각각 살펴 본 결과 두 시스템 모두 잉크 입자 표면에의 전하 존재 유무와 전하의 크기에 의해서 크게 영향을 받음을 알 수 있었다. 한편 펄프의 인장강도와 잉크 입자의 접촉각 및 표면장력은 pH 변화와 전해질의 농도 및 종류에 따라 크게 영향을 받지 않았다. Flotation deinking experiments were conducted in order to understand the effects of surfactant, pH, and electrolyte concentration on old news paper deinking efficiency. Both removal efficiency and brightness were found to increase in anionic surfactant systems both at acid and alkali conditions, because added counter ions reduced electrostatic repulsion between negatively charged air bubbles and ink particles. In mixed surfactant systems, both removal efficiency and brightness were shown to increase with a decrease in pH, mainly due to reduction in electrostatic repulsion by an increase of hydrogen ion concentration. When electrolytes were added in anionic surfactant systems or mixed surfactant systems, ink removal efficiency increased or decreased, depending on the change in electrostatic repulsion between ink particles and air bubbles. On the other hand, both pH change and addition of electrolytes did not have a significant effect on physical strength of the pulp fiber, and contact angle and surface tension of the ink particle.