Modeling Gas Holdup in Gas−Liquid−Fiber Semibatch Bubble Columns

Su, Xiaoqiang; Heindel, Theodore J.

doi:10.1021/ie050816e

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…These advantages allow researchers to easily measure the size of gas bubbles using image acquisition and data analysis [32][33][34]. Another important factor that can be measured is the gas holdup [35][36][37][38]. Unlike bubble size measurement, which is a local measurement, gas holdup is a global measurement and can be used to calculate residence time.…”

Section: Introductionmentioning

confidence: 99%

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Orlando

Barca

Klein

et al. 2019

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

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Chemical Enhanced Oil Recovery (EOR) can boost oil extraction in offshore operations, however one of the main concerns regarding its application is how the efficiency of flotation units for treating produced water is affected. The present work thus focuses on investigating the impact of EOR chemicals on the physical properties of EOR effluents and how this can affect flotation performance parameters such as bubble size and gas holdup. Design of experiments has been used to assess the influence of polymer, surfactant and sodium chloride concentrations on bubble size and gas holdup of a laboratorial bubble column. The influence of superficial gas velocity has also been assessed together with chemicals concentrations, yet at low levels in order to avoid clusters, swarms and foam. The characterization of the synthetic effluent containing polymer, surfactant and sodium chloride has indicated that the fluid behaves as a non-Newtonian fluid, what makes separation processes in flotation cells challenging. Results showed that polymer concentration of 2000 mg/L can lead to significant increases in fluid viscosity, promote a growth of more than 40% in bubble size and only increases gas holdup when surfactant is present at high concentration. Therefore, polymers are expected to be detrimental to produced water treatment. Surfactants decrease both fluid surface tension and bubble size, increasing gas holdup. For the range studied, superficial gas velocity favors gas holdup and sodium chloride concentration seems to weakly influence bubble size and gas holdup. This work highlights the fact that changes in physical properties of produced water do modify bubble size distribution and gas holdup and this must therefore be taken into account when flotation-like systems are designed to deal with EOR effluents.

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Section: Introductionmentioning

confidence: 99%

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Orlando

Barca

Klein

et al. 2019

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

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show abstract

“…As for minerals flotation, research in the flotation deinking field focuses on specific sub-processes and, to the best of our knowledge, a basic mechanistic description of the flotation deinking process accounting for both physicochemical and hydrodynamic phenomena is actually missing. Recent studies investigated the contribution of fibre type and consistency on gas hold-up [21,22] and deinking [23,24], the effect of froth drainage on fibre transport [25,26] and of de-inking chemicals on ink attachment to air bubbles and their removal [27][28][29][30][31]. Few works try to simulate industrial flotation processes using a semi-empirical approach [32,33] and the design of flotation deinking units often relies on empiricism and on the extrapolation of laboratory results to the industrial scale.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Surfactant Contribution to Ink Removal Selectivity in Flotation Deinking Lines

Beneventi,

Allix,

Zeno

et al. 2009

Trans. Of the XIVth Fund. Res. Symp. Oxford, 2009

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Transport coefﬁcients and correlations recently used to describe surfactant contribution to particle and water transport in a laboratory ﬂotation column were used to simulate the impact of surfactant contamination on the ﬂotation selectivity of industrial two-stage deinking lines. Simulation results showed that surfactants are slightly removed in the ﬁrst ﬂotation stage and are concentrated in the second one, where they induce a drop in ink ﬂotation and in ﬁbre entrainment. Subsequently, ﬂotation units in the second stage displayed lower ink removal than in the ﬁrst stage. In the presence of a constant water reject ﬂow, the increase in surfactant contamination in the pulp stock gave a general decrease in the removal of suspended solids. Surfactant removal increased from 5 to 50%, however, this increase was not sufﬁcient to prevent surfactant accumulation in the deinking line. Simulation results were compared with data collected in an industrial deinking line running in similar conditions and pulp composition, ink and surfactant removal obtained with low surfactant contamination were in line with experimental data.

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Bibliography

2014

An Introduction to Bioreactor Hydrodynamics and Gas‐Liquid Mass Transfer

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Modeling Gas Holdup in Gas−Liquid−Fiber Semibatch Bubble Columns

Cited by 9 publications

References 27 publications

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Effects of EOR chemicals and superficial gas velocity on bubble size and gas holdup of a bubble column

Simulation of Surfactant Contribution to Ink Removal Selectivity in Flotation Deinking Lines

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