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김광민,김충익 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The effect of electrolyte on methane-water volumetric mass transfer coefficient (kLa) was investigated in this study. Various electrolytes including MgSO4, K2SO4, Na2SO4, MgCl2, KCl, NaCl, MgBr2, NaBr, KBr,Mg(NO3)2, KNO3, and NaNO3 were employed and enhancement of kLa from 103 h-1 (in pure water) to 711 h-1 was observed, depending on electrolyte type and concentration. This is the highest methane-water kLa value reported. For all electrolytes, ions with large charge density (charge valency per ionic volume) exhibited larger enhancement in methane-water kLa values. Furthermore, anions exhibited larger influence than cations on the enhancement of kLa. Enhancement of methanewater kLa by electrolytes was due to the inhibition of methane bubble coalescence.
김광민,서경준,김유진,양정모,하경수,이진원,김충익 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
In this paper, we conducted an investigation into the use of bubbles modified with cationic surfactants in bubble coalescence inhibition and enhancement of methane-water volumetric mass transfer rate. Various cationic surfactants including hexyltrimethylammonium bromide (HTAB), octyltrimethylam- monium bromide (OTAB), dodecyltrimethylammonium bromide (DTAB), and hexadecyltrimethylam- monium bromide (HDTAB) were added to aqueous solution and the methane-water volumetric mass transfer coefficient (kLa) values were determined for each of the solutions. Enhancement of methanewater kLa was observed from 14 h1 to 69 h1, depending on the cationic surfactant type and concentration. Enhanced methane-water kLa in aqueous solution by addition of cationic surfactants was employed for the fermentation of methanotroph (Methylosinus trichosporium OB3b), and cell growth rate and maximum optical density was increased by 391% and 498%, respectively.
Kim, K.,Kim, Y.,Yang, J.,Ha, K.S.,Usta, H.,Lee, J.,Kim, C. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.46 No.-
<P>The effect of alcohol on methane-water volumetric mass transfer coefficient (1(0) and solubility of methane was investigated in this study. Various alcohols including methanol, ethanol, 1-propanol, butanol, and pentanol were added to aqueous solution and enhancement of both methane-water k(L)a (from 72h(-1) to 471 h(-1)) and solubility (from 21.72 mg/L to 30.41 mg/L) was observed, depending on alcohol type and concentration. Among all alcohols, 1-propanol exhibited largest enhancement via bubble coalescence inhibition effect. Enhanced methane-water kLa and methane solubility in aqueous solution were employed for the fermentation of Methylosinus trichosporium OB3b, and cell growth rate and maximum optical density were increased by 700% and 730%, respectively, by addition of 1-propanol. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Amina Fadili,Abdel Hafid Essadki 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
Experiments of hydrodynamic and gas liquid mass transfer were carried out in a bubble column of 19.4 cm internal diameter and of 4m height. The liquid phase can be either tap water or a coalescence inhibitor system, using aqueous solutions of three alcohols (ethanol, 2-propanol and 1-butanol) with a volumetric concentration of 0.05% v/v and sodium dodecyl sulfate: SDS (103mol/L) as an anionic surfactant. The hydrodynamic study involved placing wall pressure sensors in different axial positions of a bubble column to determine the gas hold-up in different regions and the influence of non-coalescing system on its evolution. The overall liquid movement induced by bubbles and the residence time distribution analysis of liquid phase was performed by using inductivity sensors. Gas hold-up results showed that the presence of the gas is more important in the zone far enough to the gas distributor (zone II). The results of the volumetric mass transfer coefficient (KLa) revealed that KLa decreased with the addition of alcohol, especially when the number of carbons in alcohol increased. KLa decreased more with the addition of anionic surfactant. It was also proven that a decrease in KLa was due to a decrease in KL, which was due to a decrease of bubble rise velocity as well as of the diffusivity when alcohol or ionic surfactant was added. Correlations were developed linking gas holdup and gas-liquid mass transfer coefficient to superficial gas velocity and surface tension gradient.
김광민,김유진,양정모,하경수,Hakan Usta,이진원,김충익 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
The effect of alcohol on methane–water volumetric mass transfer coefficient (kLa) and solubility ofmethane was investigated in this study. Various alcohols including methanol, ethanol, 1-propanol,butanol, and pentanol were added to aqueous solution and enhancement of both methane–water kLa(from 72 h 1 to 471 h 1) and solubility (from 21.72 mg/L to 30.41 mg/L) was observed, depending onalcohol type and concentration. Among all alcohols, 1-propanol exhibited largest enhancement viabubble coalescence inhibition effect. Enhanced methane–water kLa and methane solubility in aqueoussolution were employed for the fermentation of Methylosinus trichosporium OB3b, and cell growth rateand maximum optical density were increased by 700% and 730%, respectively, by addition of 1-propanol.