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Microcapsule의 효소고정화에 따른 CSTR에서의 물질전달에 관한 연구(I)
권창오 ; 차시환 김천대학교 1997 김천대학교 논문집 Vol.18 No.-
I. 緖論 I實驗 1.試藥 2. 固定化 GOD 캡슐의 製造 2-1, 나일론 캡슐의 製造 및 GOD의 固定化 2-2. 合成 2분자막 GOD 캡슐 製造 I. 結果 및 考察 1. 나일론 캡슐막의 특성 2. 합성 2분자막 캡슐의 특성 V. 結論
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Microcapsule의 효소고정화에 따른 CSTR 에서의 물질전달에 관한 연구(II)
차시환 ; 권창오 김천대학교 1998 김천대학교 논문집 Vol.19 No.-
Polyamide capsules containing aqueous solution of GOD were prepared by the interfacial polymerization of ethylenediamine and terephthaloyl chloride, and were coated with the bilayer membrane of dialkyldimethylammonium bromide(2CnN+2C1, n=11, 12, 13, 15). The activity control of the immobilized GOD through the capsule membrane was investigated for the effect of temperatures and pH changes.
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절벽의 보호재로 사용하는 철근의 부식에 따른 안정성 평가
차시환 ; 권창오 김천대학교 1994 김천대학교 논문집 Vol.15 No.-
The corrosion of metals is understood to be the degradation of the metallic structure at its surface through chemical reactions of the meal with species of the environment. From the standpoint of physical chemistry, corrosion processes belong to the general class of the phase boundary reactions. The subject of principal interest in this context is corrosion in the soil. Thus, the corrosion of steel by soil is the essential subject here. In many respects, similar basic principles apply for corrosion by pH, Temperature and rainfall : However, such special cases remain outside our consideration here. Evey study of corrosion processes has as its principal goal, if not to achieve apredictive calculation of the corrosion, at least to understand the data on the basic of a theory anal-ysis. if possible, then the corrosion rate much be quantitatively established as a function of the assential influencing parameters.
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차시환 ; 권창오 김천대학교 2000 김천대학교 논문집 Vol.21 No.-
Dangerous materials have found wide application in the manufac-ture, the flash point is of great importance as far as the prevention of chemical disasters is concerned. Data on the fire hazard of such solutions are needed for the safe performance of technological processes. The measurement of flash point is not easy, and the number of compounds for which systematic data have been collected pitifully small. Therefore, a need exists for some means of predicting the flash point of compound for which experimental data are unavail-able, not only those which are currently in use or at the production stage, but also, those not compounds which are in the process of synthesis and design. The present research concerns the application of OCD(organic conception diagram)to the association between chemical structures and flash points, and an attempt made to discover a method of predicting the approximate flash point of a compound from its chemical structure alone
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쓰레기 매립지의 안정화처리에 관한 연구(I) : 침출수 및 우수처리
권창오 ; 차시환 김천대학교 1995 김천대학교 논문집 Vol.16 No.-
This study is an experimental research on the stabilization of landfill of the domestic solid waste. The purpose of this study is to investigate the environmental aspects which are accompanied by carrying and landfilling the domestic into the Changsin-dong Young ju city landfill site. In order to know the hydrogeolosical condition, we carried out the multipurpose experimental excavation for surveying the groundwa-ter level, hydraulic conductivity of aquifer and taking the natureal soil samples. The experiment was done by in-situ and instrumental analysis for soil in order to evaluate the physi-co-chemical characteristics of the solid.
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술폰화된 polysulfone 비대칭막의 제조와 이를 이용한 물-부탄올 수용액의 탈수거동
변인섭,백귀찬,차시환,권창오,서종원,김용욱 한국막학회 1999 멤브레인 Vol.9 No.3
Polysulfone을 술폰화하여 물-부탄올 용액의 분리를 위한 투과증발용 비대칭막을 제조하였다. 술론화제로는 chlorosulfoneic acid-trimethyulchlorosilane을 반응시킨 후 이용하였다. FT-IR과 1H-NMR을 이용하여 치환여부를 살펴보았고 술폰화정도는 역적정법과 1HH-NMR을 이용하여 구하였다. DSC와 TGA를 이용하여 열적특성변화를 알아보았다. 비대칭막을 제조하기 위하여 N-methyl-2-pyrrolidone(NMP)rhkdiethyleneglycol dimethyl ether (DGDE)의 혼합용매를 사용하였다. SEM을 이용하여 단면과 skinlayer 의 구조변화를 살펴보았다. 한 연구에서 제조한 비대칭막은 dense film에 비하여 물에 대한 선택도는 거의 변화가 없고 투과유량은 약 80배 정도 증가하였다. Asymmetric membranes for pervaporation were prepared with poly sulfone and sulfonated poly sulfone in order to separate water from 90% by weight butanol solution. Chlorosulfonic acid was reacted with trimethylchlorosilane for using as a sulfonating agent. The prepared polymers were characterized with FT-IR and 1H-NMR. The thermal properties of the polymers were examined with DSC and TGA. Back titration method was used for the evaluation of the degree of sulfonation or the ion exchange capacity. N-methyl-2-pyrrolidone (NMP) and diethyleneglycol dimethyl ether (DGDE) cosolvent were used for the preparation of asymmetric membranes. The cross section and skin layer of the membranes were examined with scanning electron michroscopy to investigate membrane structure formed with cosolvent composition in the casting solution. In this article, the selectivity of the dense films were not different from each other so much. However, the permeation rates were significantly increased as much as 80 times compared to that of dense film.
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