• Title/Summary/Keyword: 유기용매

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Separation of Phenol from Waste Water (모사폐수로부터 페놀의 분리)

  • 한성록;유홍진
    • Proceedings of the KAIS Fall Conference
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    • 2002.11a
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    • pp.283-286
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    • 2002
  • 막-용매 추출을 이용하여 모사폐수로부터 페놀을 분리하였으며, 이때 미세기공 비친수성 중공사형 모듈을 사용하였다. 전체적인 시스템은 향류, 및 병류로 운영되었으며, 유기오염물은 tube 안쪽으로, 용매는 shell쪽으로 흐르게 하였다. MIBK를 추출용매로 사용하였으며, 페놀의 분리효율은 향류 흐름이 병류흐름보다 더 우수함을 알 수 있었다.

Stability of $4-Chloro-{\alpha}-(4-chlorophenyl)-{\alpha}-(trichloromethyl)$ Benzyl Alcohol(Dicofol) in Various Organic Solvents ($4-Chloro-{\alpha}-(4-chlorophenyl)-{\alpha}-(trichloromethyl)$ Benzyl Alcohol(Dicofol)의 각종유기용매중(各種有機溶媒中)에서의 안정성(安定性))

  • Shin, Hyeon-Hwa;Hong, Jong-Uck
    • Applied Biological Chemistry
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    • v.25 no.3
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    • pp.177-181
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    • 1982
  • This experiment was carried out to investigate the stability of Dicofol solutions which were prepared with various organic solvents such as xylene, toluene, methylisobutyl ketone (M.I.B.K.), cyclohexanone, N.N.-dimetyl formamide (N.N.-D.M.F.) and isophorone under different temperature and storage period. The decomposition rate of Dicofol was increased in the order of cyclohexanone> N.N.-D.M.F.>W.P.>toluene, xylene, M.I.B.K. and isophorone. However, it was shown that precipitation was found in Dicofol solutions such as xylene, toluene and M.I..B.K. except isophorone. Therefore, isophorone was recognized as the best of organic solvents tested for Dicofol in the case of emulsifiable concentrate formulation with it.

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Separation and Distribution Coefficients of Some Transition Metal Ions in Some Mixed Solvents (혼합용매에서의 양이온교환수지에 의한 전이원소의 분리와 분배계수)

  • Kee Won Cha;Si-Joong Kim;Kee Chae Park
    • Journal of the Korean Chemical Society
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    • v.17 no.6
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    • pp.434-438
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    • 1973
  • Distribution coefficients (C) of some transition metal ions such as Ni(II), Cu(II), Cd(II), Zn(II), and Hg(II) have been determined in methanol-, ethanol-, isopropanol-, acetone-, and dimethylsulfoxide-water mixtures by using Rexyn 101 (Na-form) resin and 0.2 M sodium chloride solution. The log C values of the metallic ions decrease almost straightly with the increase in reciprocal values of the dielectric constants of the mixed solvents. In the solvents having the same dielectric constants, the distribution coefficients of the metallic ions decrease with the increase in the basicity of the aprotic organic molecule and with the decrease in the molecular size of the protic organic molecule. The separation of the metallic ions has been accomplished with the eluting agent suggested by the C values.

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Effect of Solubility Parameter of Solvent Additives on the Self-Assembly Behavior of Conjugated Polymers (용매 첨가제의 용해도 계수가 공액고분자의 자기조립 거동에 미치는 영향)

  • Kwon, Eun Hye;Lee, Jeong Ik;Park, So Young;Hahm, Yea Eun;Park, Yeong Don
    • Prospectives of Industrial Chemistry
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    • v.23 no.5
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    • pp.21-32
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    • 2020
  • 유기전자소자는 용액공정을 통한 대량생산이 가능하기 때문에 기존 무기전자소자에 비해 제조비용이 저렴하고 대면적 생산이 가능하며, 유기분자의 본연 특징으로 인해 유연하고 가벼운 소자를 구현할 수 있다. 그러나 무기 반도체에 비하여 현저히 낮은 전하이동도 특성은 유기전자소자의 상용화에 걸림돌이 되고 있다. 따라서 공액고분자의 결정화도, 모폴로지, 분자배향 최적화를 통한 자기조립 박막 제조는 전하이동을 원활히 하기 때문에 유기전자소자의 개발에 필수적이다. 본 기고에서는 유기전자소자의 활성층으로 사용되는 공액고분자의 자기조립을 유도하기 위한 다양한 특성을 갖는 용매 첨가제의 효과에 대해서 알아보고, 특히 첨가제의 용해도 계수가 공액고분자의 자기조립 거동에 미치는 영향에 대해 자세히 논의하고자 한다.

Alcohol-Amine Synergism in the Organic Solvent Extraction of Tungsten (텅스텐의 아민용매 추출과정에서의 알코올의 작용)

  • Lee Hoosung;Uh, Young Sun;Sohn, Youn Soo
    • Journal of the Korean Chemical Society
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    • v.16 no.6
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    • pp.361-368
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    • 1972
  • The organic solvent mixture of 5 % trioctylamine and 5 % n-octyl alcohol in n-hexane could be loaded with tungsten to 62 g $WO_3$/1 whereas the amine alone could be loaded only to 37 g $WO_3$/1. Molecular interaction between amine and tungstate ion during the solvent extraction process and the synergistic effect of alcohol in enhancing the solubility of the amine-tungstate complex have been studied by NMR spectroscopy. Tungsten has been shown to be extracted as a polymeric tungstate ion into the organic phase to form a trioctyl ammonium polytungstate salt, which was more stabilized in the hydrocarbon medium by interacting with alcohol via hydrogen bonding between the tungstate ion and alcohol.

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Optimization of the Optical Resolution of Racemic $\alpha$-Methylbenzylamine Catalyzed by Enzymatic Reaction in Organic Media (유기용매에서 효소반응을 통한 라세믹 $\alpha$-Methylbenzylamine 광학적 분할의 최적화)

  • 강병영;김병기
    • KSBB Journal
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    • v.9 no.3
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    • pp.306-311
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    • 1994
  • Optical resolution of racemic ${\alpha}$-methylbenzylamine was carried out by using Bacillus licheniformis protease in organic media. Enantioselective amidation of racemic amino with an ester as an acyl donor was successfully employed to resolve the racemate. To enhance reaction rate and enantioselectivity, pH-adjustment by lyophilization of enzyme dissolved in buffer, colyophilization with salts or lyoprotectants, selection of solvents and molecular design of esters were investigated. The optimization of the resolution reaction achieved about 30-fold increase in initial reaction rate and about 12-fold increase in enantioselectivity, respectively.

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Enzymatic Synthesis of Lauric Acid Butyl Ester in Organic Media Containing Nonionic Surfactants (비이온 계면활성제를 포함한 유기 용액에서의 효소에 의한 라우르산부틸에스테르의 합성)

  • Cheong, Yong-Il;Lim, Kyung-Hee
    • Applied Chemistry for Engineering
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    • v.16 no.5
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    • pp.705-711
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    • 2005
  • The reaction of lauric acid vinyl ester with n-butanol was established to give lauric acid butyl ester by subtilisin A-catalyzed transesterification in organic media containing nonionic surfactants. Pyridine has been used as an organic solvent since it provides higher yields than other organic solvents. However, because of stench of pyridine, compounds enzymatically synthesized in pyridine may be unsuitable as ingredients for foods and drugs. Hence, in order to select an organic solvent to replace pyridine, sugar esters were synthesized with the protease in various organic media. However, no solvent paralleled pyridine in yields. On the basis of this result, pyridine-based W/O microemulsions containing nonionic surfactants and water were used in enzymatic synthesis of the sugar ester, and when Tween 60, Brij 56, or 1-O-octyl-${\beta}$-D-glucopyranose was used for the W/O microemulsions, the yield was higher.

Solubility of Liquid Crystalline Hydroxypropyl Chitin in Organic Solvent (액정성 히드록시프로필키틴의 유기용매에 대한 용해성)

  • Lee, Young Moo;Kim, Seong Soo;Kim, Seon Jeong;Sung, Yong Kiel;Kang, In Kyu;Son, Tae II
    • Applied Chemistry for Engineering
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    • v.4 no.2
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    • pp.403-408
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    • 1993
  • Hydroxypropyl chitin(HPCH) was prepared from chitin by reacting it with propylene oxide. The formation of liquid crystalline character of HPCH was investigated using halogenated organic solvents. Solid state $^{13}C$ NMR spectra for chitin and HPCH confirmed the incorporation of hydroxypropyl moiety. The degree of substitution of HPCH was around 0.8 as detected by elemental analysis. WAXD patterns of chitin and HPCH showed that an incorporation of hydroxypropyl unit in chitin contributed to reducing the crystallinity and enhancing the solubility in organic solvents. Polarized light microscopic pictures of concentrated HPCH solution showed that HPCH formed cholesteric liquid crystalline character at about 25w/v% solution in dichloroacetic acid and 1, 2-dichloroethane. Inherent viscosity of HPCH solution in a mixed solvent showed a transient decrease.

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Characterization of a New Poly(acrylonitrile-itaconate) based Gel-electrolyte (새로운 poly(acrylonitrile-itaconate)공중합체를 기초로 한 젤-전해질의 특성)

  • Choi B. K.;Kim S. H.;Gong M. S.
    • Journal of the Korean Electrochemical Society
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    • v.3 no.3
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    • pp.169-172
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    • 2000
  • A new gel polymer electrolyte based on the modified polyacrylonitrile (PAN), polyacrylonitrile-co-bis[2-(2-methoxyethoxy)ethyl]itaconate (abbreviated as PANI) copolymer was synthesized in expectation of enhanced trapping ability of liquid electrolytes. PAN and PANI blend was complexed with organic solvents, ethylene carbonate (EC) and dimethyl carbonate (DMC), and $LiClO_4$ salt. The highest room temperature conductivity of $2\times10^{-3}\;Scm^{-1}$ was found for a film of 25PAN+10PANl+50EC/DMC+$15LiClO_4$. The solvent-rich crystalline part decreases due to the blending of PANI and therefore number of charge carriers increases giving higher ionic conductivity. The addition of PAM as a host polymer in the PAN-based gels has beneficial effects such as higher ionic conductivity, better thermal characteristics, better miscibility with solvent, wider electrochemical stability, and better interfacial stability with lithium electrode, though it exhibits slightly less mechanical rigidity.

Optimization of Combined Process of Enzymatic Hydrolysis and Solvent Extraction for Production of Lycopene from Elaeagnus umbellata (보리수 나무 열매로부터 라이코펜 생산을 위한 효소 분해 및 유기용매 추출 복합 공정의 최적화)

  • Oh, Yun Hye;Lee, Ju Mi;Chae, Hee Jeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.293-299
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    • 2020
  • This study was undertaken to optimize combining the processes of enzymatic hydrolysis and extraction for lycopene production from autumn olive berry. The autumn olive berry was pulverized and suspended in water, followed by treatment with various hydrolytic enzymes including Ceremix, Celluclast, AMG, Viscozyme, Pectinex, Promozyme, Ultraflo and Tunicase. Reaction solutions were subjected to extraction by applying different organic solvents including acetone, ethyl acetate, hexane and chloroform. Highest yields of lycopene extraction were obtained with the Ceremix (hydrolysis enzyme) and chloroform (extraction solvent) combination. Subsequently, using this ideal combination, enzymatic hydrolysis conditions, including enzyme concentration, pH and temperature, were statistically optimized to 0.58%, 5.5 and 54.4℃, respectively, by applying the response surface method. The lycopene extraction yield increased 2.3-fold (22.6 mg/100g) by using the selected combined process. We propose that these results could be used for the future development of bioactive materials required for bio-health care products.