Measurement of activity coefficient at infinite dilution for some bio-oil components in water and mass transfer study of bubbles in the dilutor

Qureshi, Muhammad Saad; Uusi–Kyyny, Petri; Richon, Dominique; Nikiforow, Kaj; Alopaeus, Ville

doi:10.1016/j.fluid.2015.01.010

Cited by 5 publications

(10 citation statements)

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“…The dilutor cell, which is subject to modeling in this work, has been designed and used for IDAC measurements by Qureshi et al (2015), from where the details of the apparatus and its operating principles can be found. The dilutor cell has a diameter of 24 mm and working volume of either 18 cm 3 or 27 cm 3 , corresponding to liquid levels of either 40 mm or 60 mm, respectively.…”

Section: Apparatus and Vle Measurementmentioning

confidence: 99%

“…The mixing in the dilutor is induced by magnetic stirrer bar. There are no baffles in the (Qureshi et al, 2015) dilutor. Nitrogen, which is used as the carrier gas, is introduced in the cell by evenly spaced capillaries, with 0.2 mm diameter.…”

Section: Apparatus and Vle Measurementmentioning

confidence: 99%

“…Inert gas, in this case nitrogen, is used for stripping the dilute solute from a solution and solute concentration is detected from the inert gas stream exiting the apparatus by using gas chromatography (GC). Six bio-oil based compounds (n-butanol, valeraldehyde, furan, crotonaldehyde, toluene, and acrolein) are used as solutes in the work of Qureshi et al (2015) and are tested from a numerical point of view in this study. The measured infinite dilute activity coefficients for the above-mentioned compounds are shown in Table I.…”

Section: Apparatus and Vle Measurementmentioning

confidence: 99%

“…0034-6748/2017/88(10)/105110/13 88, 105110-1 © Author(s) 2017 Qureshi et al (2015) have conducted measurements for infinite dilution activity coefficients (IDAC) for various bio-oil related components and fitted thermodynamic model parameters against the experimental results. IDAC measurements are carried out in the region where the solute is in trace level in the solution.…”

Section: Introductionmentioning

confidence: 99%

“…In the IDAC cells, gas is bubbled through the liquid phase, which is also mixed to improve the contact between gas and liquid and to level out concentration differences in the liquid phase. In the work of Qureshi et al (2015), equilibrium was assumed based on an earlier work by Richon et al (1980). Approach to equilibrium was further assessed by sensitivity analysis, for example, by observing the variation in the measured activity coefficient with respect to gas flow rates.…”

Section: Introductionmentioning

confidence: 99%

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CFD analysis of laboratory scale phase equilibrium cell operation

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et al. 2017

Review of Scientific Instruments

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For the modeling of multiphase chemical reactors or separation processes, it is essential to predict accurately chemical equilibrium data, such as vapor-liquid or liquid-liquid equilibria [M. Šoóš et al., Chem. Eng. Process.: Process Intensif. 42(4), 273–284 (2003)]. The instruments used in these experiments are typically designed based on previous experiences, and their operation verified based on known equilibria of standard components. However, mass transfer limitations with different chemical systems may be very different, potentially falsifying the measured equilibrium compositions. In this work, computational fluid dynamics is utilized to design and analyze laboratory scale experimental gas-liquid equilibrium cell for the first time to augment the traditional analysis based on plug flow assumption. Two-phase dilutor cell, used for measuring limiting activity coefficients at infinite dilution, is used as a test case for the analysis. The Lagrangian discrete model is used to track each bubble and to study the residence time distribution of the carrier gas bubbles in the dilutor cell. This analysis is necessary to assess whether the gas leaving the cell is in equilibrium with the liquid, as required in traditional analysis of such apparatus. Mass transfer for six different bio-oil compounds is calculated to determine the approach equilibrium concentration. Also, residence times assuming plug flow and ideal mixing are used as reference cases to evaluate the influence of mixing on the approach to equilibrium in the dilutor. Results show that the model can be used to predict the dilutor operating conditions for which each of the studied gas-liquid systems reaches equilibrium.

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Section: Apparatus and Vle Measurementmentioning

confidence: 99%

Section: Apparatus and Vle Measurementmentioning

confidence: 99%

Section: Apparatus and Vle Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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