Water vapor adsorption isotherm expressions based on capillary condensation

Liu, Xiang Jun; Shi, Yun Fei; Kalbassi, Mohammad Ali; Underwood, R.P.; Liu, Ying Shu

doi:10.1016/j.seppur.2013.05.020

Cited by 16 publications

(12 citation statements)

References 14 publications

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“…Liu et al [18] recently proposed four isotherm expressions to account for various water vapor adsorption mechanisms. The Langmuir and Freundlich models are adopted to describe water vapor adsorption in micropores and on macropore walls, respectively.…”

Section: Adsorption Equilibrium Model and Fitting Resultsmentioning

confidence: 99%

“…The Kelvin equation determines equilibrium pressure. Analogous to the derivation of the F-G adsorption equation [18], the equation for the desorption branch is derived as follows:…”

Section: Simplified F-g Desorption Equation and Fitting Resultsmentioning

confidence: 99%

“…The Freundlich-Gaussian (F-G) equation [18] is applied to predict the water vapor adsorption isotherm. Two expressions for the desorption branch are derived from the adsorption F-G equation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A comprehensive description of water vapor equilibriums on alumina F-200: Adsorption, desorption, and H2O/CO2 binary adsorption

Liu

Shi

Kalbassi

et al. 2014

Separation and Purification Technology

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Section: Adsorption Equilibrium Model and Fitting Resultsmentioning

confidence: 99%

“…The Kelvin equation determines equilibrium pressure. Analogous to the derivation of the F-G adsorption equation [18], the equation for the desorption branch is derived as follows:…”

Section: Simplified F-g Desorption Equation and Fitting Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A comprehensive description of water vapor equilibriums on alumina F-200: Adsorption, desorption, and H2O/CO2 binary adsorption

Liu

Shi

Kalbassi

et al. 2014

Separation and Purification Technology

Self Cite

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“…3) is a two-term isotherm model developed by Liu et al (2013). The first term describes water adsorption in the pore volume of micropores and the region next to macropore walls using the Langmuir model.…”

Section: Langmuir-gaussian (L-g) Modelmentioning

confidence: 99%

“…The linear relationship can be described by the Henry's law. As an upturn curve at high a w levels, the third region can be described using the Raoult's law (Pascual-Pineda et al 2014), Kelvin's law (Liu et al 2013) and Flory-Huggins theory (Chu et al 2006). Then, a group of isotherm models (called composite models) have been developed in literatures, in which sorbed water are expressed as the sum of the two or three contributing isotherms.…”

Section: Introductionmentioning

confidence: 99%

The states of water in glutinous rice flour characterized by interpreting desorption isotherm

et al. 2017

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Water content of glutinous rice flour were determined after equilibrium at water activity (a w ) of 0.06-0.98 and temperature of 10, 20 and 30°C. Distribution of water in different states and its evolution with a w were characterized using four composite models. Interactions of water molecules with solid matrix and themselves were further evaluated. The Park model was a more realistic and mechanism-based approach for describing water desorption of glutinous rice flour. Increased equilibrium water induced by lowering temperature existed mostly as strongly bound water with only a few parts as weakly bound water. The water-polymer thermodynamic incompatibility predominated the water mobility, and resulted in a rapid decrease of diffusion coefficient at a w [ *0.7. Water diffusivity behavior with a w suggested water clustering at high a w levels. The Zimm-Lundberg theory, Park model and Brown analysis all revealed that critical a w of water clustering was of 0.81-0.85, depending on temperature, but gave inconsistent prediction about mean cluster size.

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Desorption characteristics of H2O and CO2 from alumina F200 under different feed/purge pressure ratios and regeneration temperatures

et al. 2017

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Air pre-purification is an important process for industrial air separation with cryogenic distillation method. This process is typically realized by pressure swing adsorption or temperature swing adsorption. H2O and CO2 are the two major components to be removed among the contaminants. In this paper, we establish a mathematical model describing the mass and heat balances in the adsorption bed, and the double-component adsorption/desorption equilibriums of H2O/CO2 on alumina F200. To conduct desorption performance analysis, a one-cycle process consisting of feed, blowdown, and purge step under different operating conditions, such as feed/purge pressure ratio and regeneration temperature, is numerically studied. The effect of heat on the desorption performance of H2O and CO2 is investigated by changing the purge gas temperature within 30 °C to 200 °C under feed/purge pressure ratios of 6:1.1 and 10:1.1, respectively. Detailed results of the H2O and CO2 adsorption/desorption behaviors in the bed are demonstrated. The mass and heat transfer characteristics during desorption are also analyzed. Suggestions on the optimization of the heating temperature and duration of purge gas are also proposed.

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Water vapor adsorption isotherm expressions based on capillary condensation

Cited by 16 publications

References 14 publications

A comprehensive description of water vapor equilibriums on alumina F-200: Adsorption, desorption, and H2O/CO2 binary adsorption

A comprehensive description of water vapor equilibriums on alumina F-200: Adsorption, desorption, and H2O/CO2 binary adsorption

The states of water in glutinous rice flour characterized by interpreting desorption isotherm

Desorption characteristics of H2O and CO2 from alumina F200 under different feed/purge pressure ratios and regeneration temperatures

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