學校實驗室廢水에 대한 調査 硏究 : 하단캠퍼스를 中心으로 Around the Hadan Compus of Dong-A University

엄태섭,박유미,이종팔 동아대학교 환경문제연구소 1986 硏究報告 Vol.9 No.1

The monthly estimation of the waste water components effluenced from the laboratories of Colleges in Dong-A University has been determined and the laboratory waste water and the sewage in university also analyzed to survey and study for the present situation and disposal treatment plan to get as the basic data It has been come to a conclusion as follows 1) The waste matter of laboratories in University has composed the organic chemical waste of 48% and the inorganic chemical waste of 52%. The large amount of effluence are Cu of 35% Cr of 27% in inorganic chemical waste and there are a little bit amount of Pb As. Fe CN etc. 2) The pollution level of metal ions for each college laboratory has shown the highest in the college of Natural Sciences and October in each month. This view seems that the frequency in use of laboratory are the highest and the laboratories have many students in laboratory of general physics. laboratory of general chemistry and laboratory of general biology. 3) From the analysis and determination the sewage in university has shown the average pH 7.2 as to be neutrality and COD. BOD and the contamination level have shown lower the maximum permissible limit. 4) The components of waste water of college laboratories have diversity. It seems to be proper that the blanket treatment system which recollect separately to treat each component different from the industrial waste disposal treatment because there are many the effluent outlets.

염화나프탈렌 술포닐의 친핵성 치환반응에 관한 연구

엄태섭 東亞大學校 1978 東亞論叢 Vol.15 No.2

The kinetics for solvoysis of 1-naphthalenesulfonyl chloride and 2-naphthalenesulfonyl chloride in ethanol-water and acetone-water mixtures have been studied. The nucleophilic substitution reactions of para-substit-uted anilines with the two substrates have been investigated by means of conductometry. The reactivity and mechanism fo solvolysis have been discussed in terms of solvent composition and activation parameters, but bond-breaking increased with the increase of water content. The reaction rate of 2-naphyhyl compound in solvent was faster than that of 1-naphthyl compound due to the peri-hydrogen effect in the transition state and the ground state stabilization effect. Pseudo-first order rate constants Kobs were determined for the reactions of naphthalenesulfonyl chlorides with para-substituted anilines. The second order rate constants K₂ and third order catalytic constants k₃ were then determined from kobs. For 1-naphthyl compound in this reaction peri-hydrogen effect was also observed. The large Bronsted coefficient βand large negative slope ρfor the Hammett plots were obtained. These results together with the unusually low valuses of activation paremeters were consistent with the SAN-elimination mechanism, but these could be equally well interpreted with the associative SN2 mechanism.

等誘電性 2成分溶媒系에서 鹽化알킬카르보닐의 加알코올 分解反應

柳俊夏,金良姬,成大東,朴現錫,嚴泰燮 東亞大學校 1990 東亞論叢 Vol.27 No.1

The nucleophilic substitution reactions of alkanecarbonyl chlorides with alchohols in the polar aprotic solventls have been studied by means of the conductimerical method. The results are as follows; 1. The order of magnitude of the second-order rate constants in the same substrate is acetyl carbonyl chloride>propionyl choride>X-valeryl iso-vareryl chloride. This is in full accord with the inductive effect by means of the polarizability effect that is due to connect with the σ-bond of alkyl radical to neigboring atom. 2. The reactionis proceeded through the S2 reaction mechanism from the analysis of the values of m and ℓwhich are obtained from the extended Grunwald-Winstein equation. 3. From the prediction on the More O'Ferrall plot the reaction mechanism is favored to the SN route. 4. As shown in the quantum mechanical model, the reaction mechanism is shown to favor an associative S2. 5. The reaction mechanism is in accord with an associative S2 reaction mechanism in consideration of the solvent effect exactly.

삼배위 황화합물의 산촉매 가수분해 반응

성대동,이종팔,엄태섭 東亞大學校 大學院 1995 大學院論文集 Vol.20 No.-

The acid catalyzed hydrolysis of N-substituted sulfinamides have been studied in agueous solution of perchloric acid at 25℃ by spectrophotometrically. The pH-rate profile for N-phenylbenzene-sulfinamide(a); N-p-chlorophenybenzenesulfinamide(d), N-phenyl-p-chlorobe enesulfinamide(f) and N-phenyl-o-chlorobenzenesulfinamide (h) shows linearity, while those for N-p-methoxyphenylbenzenesulfin-amide(b), N-p-methylphenylbenzenesulfinamide(c) and N-phenyl-p-ethylbenzenesulfinamide(e) have a break at about pH 3. The break of pH-rate profile is ascribed to a change in the rate-determining step of the reaction involving a hypervalent intermediate.

親核性 置換反應에서 最大速度現象과 Hammett 相關關係

성대동,이종팔,이미정,엄태섭 東亞大學校 大學院 1996 大學院論文集 Vol.21 No.-

The nucleophilic substitution reactions of p-substituted benyl bromide with p-substituted N,N-dimethyl anilines in methanol and acetonitrile binary solvent mixtures which are known as an isodielectric olvent system kinetically and the results are as follows. 1.The postive dharge is developed on the reaction center of the substrate and it means that the bond cleavage is preceded more than bond formation in the transition on the analogy of Hammett ?? values. 2.The bond formation is not progressed in the case of electron donating substituent of substrate. however, the bond formation is much developed in the case of electron withdrawing substituent of substrate on the anlogy of Hammett ?? values. 3.The nucleophilic attacking ability is shown a highest at 80%(V/V) methanol content and the bond formation is well progressed at the same methanol composition on the result of a cross interacton coefficient, ??.

β-nitrostyrene에 대한 n-propyl과 laurylmercaptan 의 親核性 添加反應 速度常數의 測定

嚴泰燮 東亞大學校 1968 東亞論叢 Vol.5 No.-

The rate-constants for the nucleophilic addition reaction of n-propylmercaptan and of laurylmercaptan to 3. 4-methylenedioxy-β-nitrostyrene, respectively, for various pH at 25℃ were observed by spectrophotometry. Those of the pseudo-first order reaction for n-propylmercaptan in acidic media and those of the second-order reaction for laurylmercaptan over the pH range o to 11 were observed. From the results, it was found that there is the simple proportionality between the rate-constants and pH above the pH;4, but there is no influence of pH on the reaction below the pH:2 for n-propylmercaptan. Therefore, it is shown that kinetics and mechanism of the reaction are obviously different at the both high and low pH range in acidic media. On the other hand, the change of rate-constants of laurylmercaptan accompanying change of pH is too complicated to interpret the mechanism of the reaction. To study for the quantitative analysis of its mechanism, there will be required more informations for the reaction of various nucleophiles to β-nitrostyrene.

염화벤질의 분몰랄 부피와 물 구조

이익춘,윤상기,김봉규,엄태섭 東亞大學校 1971 東亞論叢 Vol.8 No.3

각종 혼합수용액속에서의 Benzylchloride의 분몰랄부피를 측정하였다. 이 결과와 다른 문헌자료를 종합하여 물의구조와 有機混合成分의 첨가에 따르는 물구조의 변화를 논의하였다. (1) 탄화수소 또는 疏水性이 큰 原子團을 가진 화합물이 물속에 도입되면 물은 그 둘레에 clathrate 型의 바구니 구조를 형성한다. 따라서 물의 cluster 구조는 커지고 이 효과는 용질의 농도증가에 따라 最大点에 도달한다. 최대점에 일단 도달하면 물덩어리 곧 cage cluster는 붕괴하기 시작하고 보다 작은 덩어리 集團으로 변한다. 이러한 붕괴현상도 어느 한계점에 이르게 되면 붕괴로서 생긴 작은 덩어리들이 용질분자 사이의 空間을 가장 효과적으로 占有하겠끔 된다. (2) 과산화수소(H??O??)나 DMSO 같이 會合性을 가진 물질이 물에 녹으면 炭化水素의 경우와는 달리 정상적인 구조를 지니게 마련이다. 즉 물의 구조증대(增大)가 일어나지 않으며 共存溶媒, 예컨대 알코올의 몰分率 X??가 이 물의 구조에 영향을 줄 수 있는 단계에 이르기까지 물의 會合덩어리는 안정하게 유지된다.

Anthrone의 合成法 檢討

尹庠基,嚴泰燮 東亞大學校 1964 東亞論叢 Vol.2 No.2

A Synthesis of anthrone by reduction of anthraquinone has been undertaken by the following four methods; (Ⅰ)Reduction of anthraquinone in glacial acetc acid with stannous chloride and concentrated hydrochloric acid. (Ⅱ)Reduction of anthraquinone in glacial acetiic acid with metalic Tin and con-centrated hydrochloric acid. (Ⅲ)Reduction of anthraquinone with alkaline(NaOH)solution of sodium hydros-ulfite. (Ⅳ)The same method as the method(Ⅲ)described above,but with the addition of another reagent, turkey red oil as the weetting and dispersing agent. Each method was examined three times at least. The quantities of anthraqui-none taken in each experiment were 10.4g(0.05mol), and the range of the reac-tion time were from 45 minutes to 80 minutes. Below mentioned solvent were employed for recrystallization of the products; 95% of ethanol, glacial acetic acid, benzene, acetone, ether, the mixture of benzene and petroleum ehter. The results observed throughout the experiments were as follows; (1) The method by which the highest yield was obtained was the method(Ⅰ). Here we obtained 76% of pure product, whereas the crude yield was 97% for the theoritical values, both on the average. But the product obtained by the method (Ⅳ)was the purest in spite of lower yield. (2) The solvent for the recrystallization observed to be the most excellent was ethanol. Benzene was not effective because it dissolved anthrone in a great quantity even at low temperature, and the mixture of benzene and petroleum ehter caused the greatest loss of weight through recrystallizat-ion from crude product. On the other hand, it has been observed that glacial acetic acid and ace tone were not effective. They required a longer time to recrystallize and to decolorize and therefore, caused lower yield. They colorized the prodnct into a greenish-yellow owing in fluorescent phenmoenon of anthrone in such organic solvents as described above. (3) Reaction time was observed to be satisfactory in or about 50 minutes for the method(Ⅲ)and(Ⅳ), but 20 minutes or more longer time for the met-hod(Ⅰ)and(Ⅱ).

‘로스쿨 제도’는 사법개혁에 대한 국민들의 의지이다

엄태섭 열린전북 2011 열린전북 Vol.134 No.-

아미드 가수분해반응에서 2가 금속이온의 촉매작용

이종팔,박유미,엄태섭 東亞大學校附設基礎科學硏究所 1992 基礎科學硏究論文集 Vol.9 No.1

N-Thenoyl imidazole과 N-furoyl imidazole의 가수분해반응속도를 40℃ 물속에서 분광광도법으로 조사하였다. 산촉매반응과 염기촉매반응에 의해 가수분해반응이 진행되었다. 산촉매반응의 2차 반응속도상수는 두 기질이 비슷한 크기를 가졌으나, 염기촉매반응에서는 N-furoyl imidazole이 N-thenoyl imidazole보다 우세하였다. ??, ??, 그리고 ?? 이온에 의해 가수분해반응의 속도는 산촉매반응만을 증가시켰으며, 이때 금속이온의 포화효과도 나타났다. 이와 같은 현상은 아마 헤테로고리를 포함하는 아실기의 특성이 가수분해반응에 중요한 영향을 주는 것 같다. Rate constants have been determined for hydrolysis of N-thenoyl imidazole and N-furoyl imidazole in water at 40℃ by spectrometry. Hydronium ion and hydroxide ion catalyzed reaction were observed. Though the second order rate constants for hydronium ion catalysis of substrates is likely same, but for hydroxide ion catalysis of N-furoyl imidazole is faster than those of the N-thenoyl imidazole. Pronounced metal ion catalysis occurs in hydrolysis of this compound in the presence of ??, ??, or ??. Saturation effect was observed at high metal ion concentration in the hydrolysis of N-thenoyl imidazole and N-furoyl imidazole. Nevertheless, metal ion promoted hydronium ion catalyzed reactions occur with a little bit rate enhancements in ??, ranging from 10-20 fold with ??, ?? and ??. This results are expected that sulfur atom of thenoyl group and oxygen atom of furoyl group may be a important factor in which effects on the rate constant of hydrolysis.