• Title/Summary/Keyword: Organic Se

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Removal Rates of VOCs(Volatile Organic Compounds) for Treatment Condition using DAF(Dissolved Air Flotation) in Water Treatment (DAF(Dissolved Air Flotation)를 이용한 정수처리에서 처리조건에 따른 VOCs(Volatile Organic Compounds)의 처리효율에 대한 연구)

  • Kim, Mi-Jeong;Jun, Se-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.13 no.3
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    • pp.91-100
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    • 1999

  • Treatment conditions of DAF(Dissolved Air Flotation) and removal rates of VOCs(Volatile Organic Compounds) in mixed water of H raw water and VOCs were investigated. The used VOCs were benzene, toluene, ethylbenzene, and xylene in aromatic compounds and iso propyl mereaptan, n-butyl mereaptan, dimethyl disulfide, and iso butyl mercaptan in odors. The related parameters include water type, treatment method, clay concentration, pH condition, flocculation time, flotation time, per-cent recycle, water temperature, pressure. The removal rates of VOCs were different on treatment process and water condition. Treatment time was longer, removal rates of VOCs was higher. Water temperature was more important than pressure in DAF parameters. Molecular weight was related with removal rate in several kinds of VOCs were decraesed by competition of each component in II raw water. When algac blooming D water was treated by DAF, TCOD(Total chemical Oxygen Demand) and chorophyll a was removed over 96%.

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Colloidally stable organic-inorganic hybrid nanoparticles prepared using alkoxysilane-functionalized amphiphilic polymer precursors and mechanical properties of their cured coating film

  • Kim, Nahae;Li, Xinlin;Kim, Se Hyun;Kim, Juyoung
    • Journal of Industrial and Engineering Chemistry
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    • v.68
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    • pp.209-219
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    • 2018

  • Colloidally stable organic-inorganic (O-I) hybrid nanoparticles could be prepared using an alkoxysilanefunctionalized amphiphilic polymer (AFAP) precursor. O-I hybrid sols could maintain colloidal stability for six months even at 45% solid content and be coated onto glass as well as PET film to form transparent O-I hybrid films. The formation of O-I hybrid nanoparticles dispersed in cured coating films could be confirmed using scanning electron microscopy. The cured coating film showed 3H and 5H pencil hardness on PET and glass, respectively. Nanoindentation measurements also showed that their modulus and hardness was varied with the type of AFAP used in its preparation.

  • https://doi.org/10.1016/j.jiec.2018.07.047 인용 KSCI

Raction of Thexylbromoborane-Methyl Sulfide in Methylene Chloride with Selected Organic Compounds Containing Representative Functional Groups$^\dag$

  • Cha, Jin-Soon;Kim, Jin-Euog;Oh, Se-Yeon
    • Bulletin of the Korean Chemical Society
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    • v.8 no.4
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    • pp.313-318
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    • 1987

  • The approximate rate and stoichiometry of the reaction of excess Thexylbromoborane-methyl sulfide, $ThxBHBr{\cdot}SMe_2,$ with selected organic compounds containing representative functional groups under standardized conditions (methylene chloride, $0^{\circ}C)$ were studied in order to characterize the reducing characteristics of the reagent for selective reductions. The selectivity of the reagent was also compared to the selectivity of thexylchloroborane-methyl sulfide. Thexylbromoborane appears to be a much milder and hence more selective reducing agent than thexylchloroborane. The reagent tolerates many organic functionalities. Thus, the reagent shows very little reactivity or no reactivity toward acid chlorides, esters, epoxides, amides, nitro compounds including simple olefins. However, this reagent can reduce aldehydes, ketones, carboxylic acids, nitriles, and sulfoxides. Especially the reagent reduces carboxylic acids including ${\alpha},{\beta}$ -unsaturated ones and nitriles to the corresponding aldehydes. In addition to that, thexylbromoborane shows good stereoselectivity toward cyclic ketones, much better than the chloro-derivative.

  • https://doi.org/10.5012/bkcs.1987.8.4.313 인용 PDF