大氣浮遊粉塵中 여러고리 芳香族 化合物에 관한 硏究

朴來正 弘益大學校 1988 弘大論叢 Vol.20 No.2

Polycyclic aromatic hydrocarbons(PAH)/polycyclic aromatic sulfur heterocycles (PASH) and nitrogen containing polycyclic aromatic compounds(NPAC) were investigated in air-borne particulates of Seoul metropolitan area. The samples were fractionated by alumina column chromatography and cleaned by gel filtration using Biobead. These fractions were chromatographed in a fused silica capillary column coated with SE-54(25m×0.03mmi.d.). Nineteen compounds of PAH/PASH and 8 compounds of NPAC were identified according to retention index system, and 10 compounds were further confirmed by GC/MS data. The concentrations were relatively lower compared with previously reported data. It was considered due to photodegradation during long period of sample collection by means of deposit gauge.

아닐린의 산화적 카르보닐화에 의한 에틸페닐카바메이트의 합성

朴來正,金明雄 弘益大學校 科學技術硏究所 1992 科學技術硏究論文集 Vol.2 No.-

Ethylphenyl carbarmate(EPC) was synthesized by oxidative CO carbonylation of aniline in the presence of transition metal catalysts and alkari metal halide cocatalysts at 120℃ under the pressure of 79 atm. Oxygen gas was used for oxidizing agent. About 100% conversion to EPC and 93% selectivity was obtained in 5 hour reaction under this conditions. Increase in pressure and temperature increased conversion. 0.02% of 5% Pd/C was the most effective. Effectiveness of cocatalysts was in the order of KI>KBr>KCI as anion effects. As cation effect CsI and KI were about the same but NaI was a little lower. Iodine itself gave catalytic effect but produced more byproducts of Nethylbenzamine and N, N'-diphenylurea. No dehydration effect of zeolite and triethylorthoformate was not recognized,but decreased the reactor pressure significantly. As the temperature increased, the conversion rate increased. The reaction was apparent first order and activation energy was 5.647kcal/mol.

室素氣流下에서의 셀룰로오즈의 熱分解에 關한 硏究

朴來正 弘益大學校 1976 弘大論叢 Vol.8 No.-

When pure cellulose was pyrolyzed at 300℃ under nitrogen current for 2.5hrs, with collection traps of air cooling, water cooling, and dry ice-acetone bath cooling, 12.3% of tar, 0.01% of water-soluble liquid and 0.25% of light oil were collected and 46.9% of carbonized residue was left in the reactor. Also 41.7% of total sample was volatilized into gas. The components of water-cooled and dry ice-acetone bath cooled traps were separated by gas chromatograph with Porapak Q column. The condensate in water-cooled trap was separated into ten peaks in the chromatogram under temperature programming, 120-120℃, 2℃/min. According to the retention time compared with standard alchohols, aldehydes, ketones, and organic acids, methanol, formaldehyde,acetone, acetaldelyde, and acetic acids were primarily identified in both materials.

여러가지 溫度 및 媒條件下에서 셀룰로로오스의 熱分解時 非凝縮性가스의 成分組成에 關한 硏究

朴來正,姜元萬 弘益大學校 1978 弘大論叢 Vol.10 No.-

The production of non-condensible gases obtained from flash pyrolysis of cellulosic materials at different temperatures and with adid-base catalysts were investigated and the results were as follows. 1. When the sawdust was pyrolyzed below 300℃, major non-condensible gases were CO₂ and H₂O, producing little flammable gases. 2. Pyrolysis above 400℃ produced flammable gases such as hydrogen, carbon monoxide, ethylene, propylene, and propane. 3. The amount of non-condensible gases was plotted against temperatures from 400℃ to 700℃ at 100degree interval. The amount of the gases increases exponentially with temperatures. 4. The acid catalysts such as phosphoric acid and zinc chloride significantly reduced the production of flammable gases, but increased production of carbon dioxide. However, a phosphoric acid catalyst showed some increase in methane production. 5. A base catalyst, calcium carbonate markedly increased the production of flammable gases, in particular, production of carbon monoxide.

The Effect of Fillers on Curing Kinetics of o-Cresol Novolac Epoxy-Phenol Resins

朴來正 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

시차열 주사열량계를 사용하여 승온경화시 충전제로서 실리카를 가하였을 때 오르토-크레솔 노볼락수지와 페놀 경화제계에서 경화반응속도에 미치는 효과를 조사하였다. 경화반응을 n-차반응으로 가정한 Kissinger방법과 자동촉매작용이라고 가정한 Flynn-Wall 방법을 이용하여 활성화 에너지를 계산한 결과 활성화 에너지의 값이 60phr과 70phr에서는 두 방법 모두 큰 차이를 보이지 않다가 80phr에서는 급격히 감소하였다. Flynn-Wall방법에서 활성화 에너지가 약rks 높은 값을 주었으나 그 차이는 그렇게 크지 않고 충전제 양에 따른 효과는 같은 경향을 보였다.

Capillary Gas Chromatography/Mass Spectrometry에 의한 리그닌 타아르의 成分硏究

朴來正 弘益大學校 1983 弘大論叢 Vol.15 No.2

A lignin tar was obtained by flash pyrolysis of Kraft pine lignin at 600℃ in nitrogen atmosphere. The tar was fractionated into four fractions, nonpolar neutral, polar neutral, bases, and acids fractions according to standard solvent partitioning scheme. Each fraction was chromatographed using fused-silica capillary column coated with SE-54 and crosslinked. Individual compound was identified according to retention indices and mass spectra obtained in GC/MS system. Twenty seven polycyclic aromatic compounds were positively identified in nonpolar neutral fraction, and 17 compounds, mostly exygenated hydrocarbons in polar neutral fraction, 12 compounds, mostly quinoline derivatives in base fraction, and 14 compounds, mostly phenolics in acid fraction.

Propylene에 의한 Phenol의 알킬화반응

朴來正,朴濟煥 弘益大學校 1987 弘大論叢 Vol.19 No.2

The alkylation of phenol with propylene was investigated with respect to species and amount of catalysts, speed of stirring, reaction temperature, reaction time, and flow rates of propylene. The effect of various catalysts an propylation was in the order of fuming sulfuric acid, boron trifluoride, phosphoric acid, and aluminum chloride. Speed of stirring increased the conversion rate linearly but slowly. Conversion rate was also increased with flow rate of propylene upto 60cc/min and plateaued afterwards. Conversion rate was increased with reaction temperature but increase rate was not marked above 113℃. Maximum conversion rate of phenol was 0.990 at 164℃, 120cc/min of flow rate, 33)rpm of stirring speed, and 7 hours of reaction time in the presence of fuming sulfuric acid catalyst. The alkylation was carried out in the pseudo second order reaction kinetics with respect to the concentration of phenol. The linear relationship was shown between apparent rate constant and absolute temperatures, and activation energy of 7.70 Kcal/g-mol for the reaction with fuming sulfuric acid catalyst was calculated.

2, 4-Diamino-7-phenyl-6-methylthiopteridine 合性에 關한 硏究

朴來正,金明雄 弘益大學校 1986 弘大論叢 Vol.18 No.2

2, 4, 6-Triamino-5-nitrosopyrimidine was prepared using malononitrile and guanidine carbonate, and acetylated refluxing in acetic acid with acetic anhydride in order to ativate the nitroso group for nucleophilic attack. Nucleophilic attack of phenylpyrimidium bromide on the nitroso group of 2, 4, 6-triacetamido-5-nitrosopyrimidine gave the intermediate, which lost pyridine to give the nitrone derivative. Addition of the methanethiol anion to nitrone gave 2, 4-diacetamido-7-phenyl-6-methylthiopteridine which was hydrolyzed to give 2, 4-diamino-7-phenyl-6-methyl thiopteridine. Spectral data(IR, M.S, NMR) were provided to identify the reaction products during synthesis.

人蔘의 揮發性 香氣成分에 關한 硏究

朴來正 弘益大學校 1984 弘大論叢 Vol.16 No.2

Volatile ginseng flavor Components were obtained from the manufacturing process of ginseng extract. Flavor components were separated by fused silica capillary column coated with SE-52. Individual components were identified by means of GC/MS system. Twenty six compounds were identified as esters, ethers, monoterpenes, and sesquiterpenoids. Some of them were β-pinene, isobutyl propionate, 2-isopropyl-5-methyl anisole, β-maaliene, α-guaiene, and β-elemene.

活性汚泥 및 塵芥堆肥中 水溶性 鐵킬레이트의 分離와 特性에 關한 硏究

朴來正,프랑크 알 스터미츠,윌라드 엘 린지 弘益大學校 1974 弘大論叢 Vol.6 No.-

이 硏究는 都市有機廢物을 利用한 有機質肥料로서 活性汚泥 및 塵芥堆肥를 킬레이트화 物質로서의 利用價値를 評價하기 爲하여 수행되었다. 鐵킬레이트화에 관여하는 水溶性物質을 分子체 分劃法으로 分離하여 紫外線 및 赤外線分光分析法으로 그 構造를 조사하였고 Fe 등과의 安定度常數를 이온交換平衡法으로 測定하여 이들을 킬레이트물질로 使用하였을 때 그 安定性을 調査하였다. 塵芥堆肥에서 抽出된 有機物質은 Sephadex G-25에 依해 4個分劃으로 分離되었고 이중 鐵과 킬레이트를 이루고 있던 分劃은 分子量이 5,000~10,000 사이에 있었고 polyphenol 構造의 酸素群이 킬레이트화에 關與하고 있었다. 活性汚泥 抽出物은 Sephadex G-25에 依해 6個의 分劃으로 分離되었고 이중 킬레이트를 이루고 있던 分劃은 5,000~10,000 또는 5,000에 약간 未達하는 分子量을 가지고 있고 polypeptide 構造의 amide기가 킬레이트화에 關與했다. 이들의 安定度常數도 合成킬레이트 물질의 安定度와 크게 差異가 없을 程度로 安定하였다. This study was conducted to study the properties of the water-soluble natural chelating agents from garbage compost and activated sewage sludge responsible for Fe chelation, which is closely asso챠ated with the effectiveness in correcting iron chlorosis in plant. The water-soluble fractions of Fe chelates were traced by radioactive Fe. The fractions were examined by ultraviolet and infrared. spectoscopy and stability canstants for Fe. The water-soluble fraction from garbage compost was separated by Sephadex G-25 into approximately four fractions. Most of the added Fe was associated with fraction I, which appeared at the void volume. Further fractionation by Sephadex G-50 indicated that the molecular weight of water-soluble chelating agents is in the approximate range of 5000 to 10,000. The water-soluble fraction from activated sewage sludge gave six fractions by Sephadex G-25. Most of the added Fe was found in the fraction Ⅰ, Ⅱ, and Ⅲ. The molecular weights of most chelating agents associated with Fe appeared to be less than 5,000 and those of fraction I that appeared at the void volume was in th range of 5,000 to 10,000. Discrepancy between radio activity count and UV absorption indicated the heterogeneity of the fractions obtained by Sephadex gel filtration. Ultraviolet absorption spectra of all fractions separated by Sephadex G-25 and containing chelating agents showed no differences. Fraction Ⅳ and Ⅴ of sewage extract showed absorption maxima and shifting similar to nucleic acid components suggesting the presence of decomposition products of nucleic acid. Similarily fraction Ⅵ contained phenolic type amino acid groups. Fraction Ⅰ of compost extract contained most of the added Fe and showed weak but extra definite absorption in the 1230, and 1270㎝ region, suggesting that extra oxygen groups in polyphenolic structure were probably involved in Fe chelation. In sewage extract, fraction Ⅰ, Ⅱ, and Ⅲ in which most of the Fe was found, showed strong definite polypeptide absorption in the region of 1540㎝ due to NH deformation and C-N stretching of amide groups in the peptide bond. These extra functional groups in fraction Ⅰ, Ⅱ, and Ⅲ appeared to be associated with Fe cheltion. The other fractions, not associated with Fe, still have carboxyl and hydroxyl groups, suggesting that these functional groups in thess water extracts may not independently form the Fe chelates. Precipitation of ferric hydroxide precluded measuring the stability constants for Fe chelates. However, the formation constraints for Zn chelates as log K values for compost extract and sewage extract at pH 4.0, from which the strength of chelation with Fe could be presumed, were 8.23, and 9.75, respectively, indicating strong complexation with metals. The chelating capacity of compost of extract containing 6.5g organic matter per liter was 0.82 mM, and that of sewage extract containing 5.3g per liter was 0.64 mM.