Modelling of Mass transfer during pervaporation of Ethanol/Water Mixture using Polydimethylsiloxane Membrane

AbstractIn this work, a falling film micro reactor was investigated regarding its ability to continuously eliminate tetrahydrofuran (THF) out of a THF-water mixture via nitrogen stripping. Mass transfer measurements were performed at different temperatures and flow rates. The residual content of THF in the eluate was quantified with high precision (<0.1%) via density measurements. Remarkably, complete elimination of THF could be achieved for liquid volume flow rates smaller than 2 ml/min and nitrogen volume flow rates larger than 400 ml/min at all three investigated temperatures (55°C, 60°C, and 65°C). In order to assist future design processes of such binary microstripping systems, we further developed a mass transfer model for this separation process extending an existing model for evaporation of a pure liquid. The good agreement of experimental data and calculations in the overall investigated parameter range (≤20%, for gas flow rates below 500 ml/min ≤11%) shows the potential of the model for the prediction of alternative operational parameter settings, e.g. at different THF entrance concentrations.

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Development of a slug flow absorber working with ammonia–water mixture: part II—data reduction model for local heat and mass transfer characterization

International Journal of Refrigeration ◽

10.1016/s0140-7007(03)00021-5 ◽

2003 ◽

Vol 26 (6) ◽

pp. 698-706 ◽

Cited By ~ 20

Author(s):

H.Y. Kim ◽

B.B. Saha ◽

S. Koyama

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Data Reduction ◽

Slug Flow ◽

Local Heat ◽

Water Mixture ◽

Ammonia Water ◽

Reduction Model

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Numerical study of heat and mass transfer enhancement for bubble absorption process of ammonia-water mixture without and with nanofluids

Thermal Science ◽

10.2298/tsci170313229b ◽

2018 ◽

Vol 22 (6 Part B) ◽

pp. 3107-3120 ◽

Cited By ~ 6

Author(s):

Hamida Ben ◽

Jalel Belghaieb ◽

Nejib Hajji

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Numerical Study ◽

Water Mixture ◽

Absorption Process ◽

Transfer Enhancement ◽

Ammonia Water ◽

Mass Transfer Enhancement

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The pervaporation performance and mass transfer process of PDMS membranes for acetic acid/water mixture

e-Polymers ◽

10.1515/epoly.2011.11.1.43 ◽

2011 ◽

Vol 11 (1) ◽

Author(s):

Housheng Hong ◽

Longxiang Chen ◽

Qingwen Zhang ◽

Tao You

Keyword(s):

Mass Transfer ◽

Acetic Acid ◽

Separation Factor ◽

Mass Transfer Process ◽

Silica Content ◽

Acid Water ◽

Water Mixture ◽

Acetic Acid Water ◽

And Performance ◽

Feed Temperature

AbstractPolydimethylsiloxane (PDMS) membranes with different silica content were prepared without support. The characterization and performance of the membranes were investigated by scanning electron microscope (SEM), thermogravimetry analysis (TGA), contact angle meter and swelling experiment. The pervaporation process was investigated with acetic acid/water mixture. And the process of mass transfer was analysed depending on the solution-diffusion model. The addition of silica could greatly improve the pervaporation flux and enhance the thermal stability of membrane. With an increase in feed temperature, selectivity decreased and permeation flux increased for the unfilled PDMS membrane. However, the separation factor of silica loading of 10 wt. % membranes, exhibited a maximum at 50 °C, and it was higher than unfilled membrane when feed temperature was above 40 °C. With the enhancement of acetic acid concentration, flux and separation factor increased. And the unfilled membrane and the silica filled membrane were prior permeation membranes for water when the downstream pressure of unfilled membrane and silica filled membrane was over 1000 Pa and 1500 Pa respectively.

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