Effect of pH and Concentrated Salt on the Droplet Size and Mass Transfer Coefficient in a Stirred Liquid–Liquid Reactor

Park, Jeil; Lee, Shinbeom; Lee, Jae Woo

doi:10.1021/acs.iecr.7b04793

Cited by 11 publications

(4 citation statements)

References 45 publications

(77 reference statements)

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“…After the complete replacement of the system gas by oxygen, the object gas was distributed, and the variation of DO in the system liquid was measured using a polarographic DO meter (Hanna Instruments, HI98193). The collected DO data were transferred to the PC, and the experimental k l a was calculated by the following equation 36,46,47 Bubble velocity was measured by a stopwatch. Once a bubble was released above the sparger, exact time measurement began.…”

Section: Methodsmentioning

confidence: 99%

Prediction of Main Regime Transition with Variations of Gas and Liquid Phases in a Bubble Column

Park

Lee

2019

ACS Omega

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Industrial bubble columns mainly operate in a heterogeneous flow regime and identifying transition from homogeneous to heterogeneous flow is important. This work addresses the determination of flow regimes with gas–liquid systems in a bubble column. Various parameters of gas holdup, volumetric mass transfer coefficient, drift flux, and pressure standard deviations were investigated to precisely determine the superficial gas velocity at the transition regime. For a column aspect ratio ( H / D : static liquid height to column diameter ratio) of 2.5 to 5, the transitional superficial gas velocity generally became higher with lower liquid height. However, the reverse trend was observed with a low density gas system due to the difference in force balance acting around the bubble. The weak body force and drag force in a lower axial position interrupted the mass transfer process. The experimental results showed similar ranges of the transitional superficial gas velocity regardless of the choice of parameter for detecting it. Because there is no precise correlation about transition regime properties, we proposed new correlations to predict both transition regime superficial gas velocity and gas holdup by taking the intersection of the two regimes. The correlations precisely captured the transition regime properties within 15% deviations even in gas–liquid systems that are not tested in this work.

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Section: Methodsmentioning

confidence: 99%

Prediction of Main Regime Transition with Variations of Gas and Liquid Phases in a Bubble Column

Park

Lee

2019

ACS Omega

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“…As such salt addition to a suspension alters its physiochemical properties (salinity effect, A). It's been earlier reported that addition of salt leads to increase in oil droplet size as it induces the thinning of the Electric Double Layer (EDL) because of the electrostatic screening effect of salt (Park et al, 2018). The EDL prevents the coalescence of oil droplets by electrostatic repulsion, by its thinning oil droplets tend to combine.…”

Section: Droplet Sizementioning

confidence: 99%

Design and formulation of surfactant stabilized O/W emulsion for application in enhanced oil recovery: effect of pH, salinity and temperature

Kumar

Ali

Kumar

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Mobilization of crude oil from the subsurface porous media by emulsion injection is one of the Chemical Enhanced Oil Recovery (C-EOR) techniques. However, deterioration of emulsion by phase separation under harsh reservoir conditions like high salinity, acidic or alkaline nature and high temperature pose a challenge for the emulsion to be a successful EOR agent. Present study aims at formulation of Oil-in-Water (O/W) emulsion stabilized by Sodium Dodecyl Sulfate (SDS) using the optimum values of independent variables – salinity, pH and temperature. The influence of above parameters on the physiochemical properties of the emulsion such as average droplet size, zeta (ζ) potential, conductivity and rheological properties were investigated to optimize the properties. The influence of complex interactions of independent variables on emulsion characteristics were premeditated by experimental model obtained by Taguchi Orthogonal Array (TOA) method. Accuracy and significance of the experimental model was verified using Analysis Of Variance (ANOVA). Results indicated that the experimental models were significantly (p < 0.05) fitted with main influence of salinity (making it a critical variable) followed by its interactions with pH and temperature for all the responses studied for the emulsion properties. No significant difference between the predicted and experimental response values of emulsion ensured the adequacy of the experimental model. Formulated optimized emulsion manifested good stability with 2417.73 nm droplet size, −72.52 mV ζ-potential and a stable rheological (viscosity and viscoelastic) behavior at extensive temperature range. Ultralow Interfacial Tension (IFT) value of 2.22E-05 mN/m was obtained at the interface of crude oil and the emulsion. A favorable wettability alteration of rock from intermediate-wet to water-wet was revealed by contact angle measurement and an enhanced emulsification behavior with crude oil by miscibility test. A tertiary recovery of 21.03% of Original Oil In Place (OOIP) was obtained on sandstone core by optimized emulsion injection. Therefore, performance assessment of optimized emulsion under reservoir conditions confirms its capability as an effective oil-displacing agent.

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“…Under this circumstance, the volume fraction of NaI solution is 50%. For the homogenization of each phase, an overhead stirrer unit and double Rushton impellers are used, and each impeller is placed at the half of each liquid depth, which is also adopted by Park et al 25 to estimate the partition coefficient, as shown in Figure 6. Impeller speed N is set as 50 rpm, which is slow enough to maintain a flat interface and prevent droplet formation.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…Fang et al 23 studied the mass transfer in a liquid−liquid−solid system and found that the presence of inert solid particles enhanced the liquid−liquid mass transfer at high rotational speeds. The mass transfer characteristics and hydrodynamics of the liquid− liquid laminar flow in microchannels were studied by Zhang et al 24 Park et al 25 studied the effect of pH and concentrated salt solution on the mass transfer coefficient in a stirred liquid− liquid reactor, and they found that the mass transfer coefficient increased with the increase of NaOH and NaCl concentrations. Some previous works used acoustic-assisted technology to study the liquid−liquid mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Visual Study on the Interphase Mass Transfer of Immiscible Liquid–Liquid System in a Stirred Tank

Duan

Yang

2019

Ind. Eng. Chem. Res.

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A novel experiment is designed to visually study the interphase mass transfer in an immiscible liquid–liquid system using the planar laser-induced fluorescence method combined with the refractive index matching technique. Rhodamine B is chosen as the fluorescence tracer because it can dissolve in both aqueous and organic phases. The experimental results indicate that the mass transfer equilibrium time is negatively correlated to the agitation speed. For the Rushton disk turbine, the interphase mass transfer efficiency is enhanced as the impeller clearance increases from T/10 to 2T/5. Furthermore, the interphase mass transfer process is dampened and the equilibrium time increases continuously when the volume fraction of NaI solution increases from 2 to 50%. When the impeller eccentricity increases, the mass transfer equilibrium time increases correspondingly and the trend of its change in the immiscible liquid–liquid system is contrary to that of mixing time in the single phase.

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Effect of pH and Concentrated Salt on the Droplet Size and Mass Transfer Coefficient in a Stirred Liquid–Liquid Reactor

Cited by 11 publications

References 45 publications

Prediction of Main Regime Transition with Variations of Gas and Liquid Phases in a Bubble Column

Prediction of Main Regime Transition with Variations of Gas and Liquid Phases in a Bubble Column

Design and formulation of surfactant stabilized O/W emulsion for application in enhanced oil recovery: effect of pH, salinity and temperature

Visual Study on the Interphase Mass Transfer of Immiscible Liquid–Liquid System in a Stirred Tank

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