• Title/Summary/Keyword: iso-Propanol

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Measurement of Autoignition Temperature for Toluene + iso-Propanol (IPA) and p-Xylene+n-Butanol Systems (Toluene과 iso-Propanol계 및 p-Xylene과 n-Butanol계의 자연발화온도 측정)

  • Yoon, Yeo-Song;Ha, Dong-Myeong;Yu, Hyun-Sik;Lee, Yong-Soon
    • Fire Science and Engineering
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    • v.24 no.2
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    • pp.172-177
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    • 2010
  • The values of the AIT (autoignition temperature) for fire and explosion protection are normally the lowest reported. The MAITB (Minimum Autoignition Temperature Behavior) of flammable liquid mixture is exhibited when the AITs of mixture is below the AIT of the individual components. The MAITB is an interesting experimental features, which can be significant from the perspective of industrial fire safety. In this study, the AITs of toluene + iso-propanol(IPA) and p-xylene + n-butanol systems were measured using ASTM E659-78 apparatus. The AITs of toluene, iso-propanol (IPA), pxylene and n-butanol which constituted two binary systems were $547^{\circ}C,\;463^{\circ}C,\;557^{\circ}C$ and $340^{\circ}C$ respectively. The toluene + iso-propanol(IPA) system is exhibited MAITB at 0.3 mole fraction of toluene, and its minimum autoignition temperature was $460^{\circ}C$.

Higher Alcohols composition in Korean Alcoholic Beverages (국내산 증류주의 고급 알콜 조성에 관하여)

  • 이해금;최용순;정의호
    • Journal of Food Hygiene and Safety
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    • v.4 no.3
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    • pp.257-261
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    • 1989
  • In order to evaluate the characteristics and quality of various Korean alcoholic beverage, the higher alcohols profiles were analyzed by gas-chromatography. Total amount of the higher alcohols depended on the type and class of the liquors. Gaschromatographic analysis showed that the type of Gin, Rum and Vodka except for SB contain n-propanol mainly. The amount of the higher alcohols determined was proportional to the content of the originally fermented liquor in the whisky. The difference in the ratio of iso-amyl alcohol content to that of iso-butanol may be useful as a parameter in evaluating the class of the whisky.

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Gamma-Radiolysis of Carbon Dioxide (V). Radiolysis of Carbon Dioxide-Alcohol Mixtures (이산화탄소와 알코올류의 혼합물에 대한 방사선 분해반응에 관한 연구)

  • Choi Sang Up;Pyun Hyung Chick;Jin Joon Ha
    • Journal of the Korean Chemical Society
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    • v.35 no.1
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    • pp.3-15
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    • 1991
  • The gaseous mixtures of iso-propanol of 10 torr with carbon dioxide of 0∼1990 torr were irradiated with Co-60 gamma radiation up to 50 kGy, and the products such as carbon monoxide, acetone, methane, ethane, C$_3$H$_a$, C$_4$H$_b$ and tert-butanol were analyzed by gas chromatography. G(CO) value of 4 was obtained from the gas mixtures containing more than 490 torr of carbon dioxide. The production rates of the organic products and the decomposition rate of iso-propanol increased linearly with the pressure of carbon dioxide, and G(-iso-Propanol) and G(Acetone) values increased by 4 and 2, respectively, with each 10 torr increment of carbon dioxide pressure. The mechanisms of the radiolytic decomposition of iso-propanol and the production of carbon monoxide and organic materials are discussed on the basis of the experimental results of the present study.

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Comparison of the Aroma Components in the Korean Traditional Yakjus. (전통(傳統) 약주(藥酒)의 향기성분(香氣成分) 비교(比較))

  • Jung, Ji-Heun;Jung, Soon-Teck
    • Applied Biological Chemistry
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    • v.30 no.3
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    • pp.264-271
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    • 1987
  • Baikhaju, Nockpaju, Dongdongju and Chungmyungju of the traditional Yakjus - the native alcoholic beverage of Korea - with the different fermentation methods were brewed and the volatile odor components were analized by gas chromatography methods of headspace gas. The general constituent content in them was different a little, and formaldehyde, acetone, acetaldehyde, ethylacetate, ethylalcohol, n-propanol, iso-butanol, iso-amylalcohol, diacetyl and dimethyl sulfide were separated and quantified into the volatile aroma components. The contents of acetaldehyde, ethylacetate and n-propanol were $17{\sim}73ppm$, and iso-amylalcohol were $418{\sim}925ppm$. The contents of formaldehyde and acetone were $0{\sim}2.15ppm$, and that of diacetyl and dimethyl sulfide were $0.032{\sim}1.012ppm$, and $5{\sim}65ppb$.

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Preparation and Characterization of Al-Zr Mixed Oxide Catalysts (Al-Zr 혼합산화물 촉매의 제조 및 특성분석)

  • Park, Jung-Hyun;Youn, Hyun Ki;Shin, Chae-Ho
    • Clean Technology
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    • v.22 no.1
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    • pp.9-15
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    • 2016
  • xAl-yZr mixed oxide catalysts with different molar ratios of Al/(Al+Zr) were prepared by a co-precipitation method and its catalytic performance was compared in the iso-propanol dehydration as a model reaction. The catalysts were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), N2 adsorprion-desorption, NH3 temperature programmed desorption (NH3-TPD), and iso-propanol TPD analyses. The addition of Al into ZrO2 promoted the formation of relatively small particles with large surface areas and retarded the transformation of teragonal phase to monoclnic phase. NH3-TPD results revealed that the relative acidity of the catalysts increased along with the increase of Al molar ratio. The catalytic activity for the dehydration of iso-propanol to propylene was also increased with the same tendency. The catalytic activity could be correlated with high surface area, acidity and easy desorption of iso-propanol.

Electrophoretic Deposition of YBCO powder in mixed suspension solution of iso-prophanol and iso-buthanol (이소프로판올과 이소부탄올 용매에서의 YBCO 분말 영동전착)

  • Soh, Dae-Wha;Li, Ying-Mei;Park, Jung-Cheul;N., Korobova
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.288-291
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    • 2001
  • It is very important to select suspension solution for forming electrophoretic deposited YBCO thick mm, because it is heavily affected to its superconducting properties. In this paper, high-temperature superconductor films of $YBa_{2}Cu_{3}O_{7-x}$ were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension such as iso-propanol, iso-butanol, and their mixture. For the formation of YBCO dense and adherent coating on a silver wire by EPD, 1 % PEG(1000) 2 ml, as a additive for making their surface crack-free, was used for electrophoresis. As a results, the cracks were considerably decreased and the superconducting critical current density $(J_e)$ without/with PEG was $1200A/cm^2$ and $2020A/cm^2$, which films deposited in mix iso-propanol and iso-butanol suspension.

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Electrophoretic Deposition of YBCO powder in mixed suspension solution of iso-prophanol and iso-buthanol (이소프로판올과 이소부탄을 용매에서의 YBCO 분말 영동전착)

  • ;;;Korobova N.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.288-291
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    • 2001
  • It is very important to select suspension solution for forming electrophoretic deposited YBCO thick film, because it is heavily affected to its superconducting properties. In this paper, high-temperature superconductor films of YBa$_2$Cu$_3$$O_{7-x}$ were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension such as iso-propanol, iso-butanol, and their mixture. For the formation of YBCO dense and adherent coating on a silver wire by EPD, 1% PEG(1000) 2 $m\ell$, as a additive for making their surface crack-free, was used for electrophoresis. As a results, the cracks were considerably decreased and the superconducting critical current density (J$_{c}$) without/with PEG was 1200 A/$\textrm{cm}^2$ and 2020 A/$\textrm{cm}^2$, which films deposited in mix ism-propanol and iso-butanol suspension.ion.

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Odor Threshold and Agreeability of Aroma Components of Yakju (약주(藥酒) 향기성분(香氣成分)의 역치와 쾌감도(快感度))

  • Jung, Ji-Heun;Jung, Soon-Teck
    • Applied Biological Chemistry
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    • v.30 no.3
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    • pp.272-277
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    • 1987
  • The odor threshold and agreeability of aroma components in Korean Yakju were measured in Null-Yakju, 19% ethyl alcohol solution, $20^{\circ}C$ distilled water and $50^{\circ}C$ distilled water by 20 panels. The measurement of the odor threshold in Null-Yakju was as follows: Formal-dehyde 5ppm, acetaldehyde 20ppm, ethylacetate 30ppm, ethyl alcohol 5g/l, acetone 7ppm, diacetyl 0.2ppm, n-propanol 20ppm, iso-butanol 80ppm, iso-amyl alcohol 10ppm and dimethyl sulfide 2ppm were found. The most agreeability of amyl alcohol, ethyl alcohol and acetaldehyde were $80{\sim}350ppm$, $2.6{\times}10^4{\sim}1{\times}10^5ppm$ and $75{\sim}160ppm$.

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Acidic Properties of Mg-Al Mixed Oxides in the Dehydration of iso-Propanol (이소프로판올의 탈수반응에 있어서 Mg-Al 혼합 산화물의 산점 특성)

  • Youn, Hyunki;Ahn, Ji-Hye;Park, Jung-Hyun;Shin, Chae-Ho
    • Clean Technology
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    • v.20 no.3
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    • pp.330-336
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    • 2014
  • Mg-Al mixed oxides with molar ratio of Mg/Al = 1-3 were prepared by co-precipitation and characterized by using X-ray diffraction, scanning electron microscopy, BET surface area and pore volume measured by $N_2$ sorption analysis, and temperature programmed desorption of iso-propanol. As Al content in Mg-Al mixed oxide increased, the acidity and BET surface area proportionally increased. This increase of acidity directly influenced the catalytic activity of iso-propanol conversion and selectivity to propylene.