Properties of Mixtures with Water

Brunner, Gerd

doi:10.1016/b978-0-444-59413-6.00003-0

Cited by 5 publications

(7 citation statements)

References 126 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For each pair of solvent and solute, as in the case of the Henry constant, the infinite dilution distribution parameter K ∞ can be approximated as a function of temperature. Remarkably, however, near the solvent critical point, K ∞ correlates well with the solvent density , where A Kr is the Krichevskii parameter that has units of pressure, ρ l and ρ cr are, respectively, the saturated and critical densities of the solvent, and M is the molar mass of the solvent. Equation shows implicitly the variation of K ∞ , and hence , with the temperature.…”

Section: Methodsmentioning

confidence: 93%

“…In practice, however, the heat of dissolution varies with temperature, and therefore, constructing such an approximation becomes useful only for capturing Henry’s constant variation around a specific temperature. To describe more accurately the Henry’s constant behavior over a wide range of temperatures, semi-empirical correlations have been proposed for non-electrolyte solutes in water and other solvents. , …”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

2022

View full text Add to dashboard Cite

The accurate determination of the solubilities of the typical impurity gases present in captured CO2 in the carbon capture, utilization, and storage chain is an essential prerequisite for the successful modeling of the CO2 stream thermodynamic properties. In this paper, Henry’s law constants and the vapor–liquid distribution coefficients of six noncondensable gases, namely, N2, O2, H2, CH4, Ar, and CO, at infinite dilution in liquid CO2 are derived based on published vapor–liquid equilibrium data at temperatures ranging from the triple point (216.59 K) to the critical point (304.13 K) of CO2. The temperature dependence of Henry’s law constants of the six gases is correlated using approximating functions previously proposed for aqueous solutions. A correlation that provides the best fit for the Henry constants data for all the six gases, with the accuracy (absolute average deviation %) of 4.2%, is recommended. For N2, O2, H2, Ar, and CO, the combined standard uncertainty in the derived Henry constants is less than 6%, whereas for CH4, due to a larger deviation between the utilized data, the uncertainty is less than 18%. Analysis of the temperature variation of the vapor–liquid distribution coefficient at infinite dilution shows that when all the six gases are present in the CO2 stream, separation of N2, O2, Ar, and CO from CO2 can be problematic due to their similar volatilities, while the distinct volatilities of H2 and CH4 at lower temperatures make their separation from CO2 easier.

show abstract

Section: Methodsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

2022

View full text Add to dashboard Cite

show abstract

“…The equilibrium concentration of the hydrogen ions, hence, the pH value and the equilibrium constant are influenced by variations of CO 2 pressure and temperature . The properties of the water–CO 2 mixture were reported in detail by Brunner …”

Section: Introductionmentioning

confidence: 99%

“…In aqueous medium at high pressure and temperature, CO 2 reacts with water to form carbonic acid, which dissociates to increase the hydronium ion concentration of the solution, therefore acting as an acid catalyzer of the process, even if CO 2 is only slightly dissolved and dissociated in water . The equilibrium concentration of the hydrogen ions, hence, the pH value and the equilibrium constant are influenced by variations of CO 2 pressure and temperature . The properties of the water–CO 2 mixture were reported in detail by Brunner …”

Section: Introductionmentioning

confidence: 99%

Valorization of Residual Biomasses from the Agri-Food Industry by Subcritical Water Hydrolysis Assisted by CO₂

et al. 2017

View full text Add to dashboard Cite

In this work, four residual biomasses from the food industry (coconut husk, defatted grape seeds, sugar cane bagasse, and pressed palm fiber) were subjected to subcritical water hydrolysis assisted by CO2 (SubWH + CO2) with the objective of producing fermentable sugars. Hydrolysis kinetics were determined using a semi-batch unit equipped with a 50 mL reactor. The process was conducted at 250 °C for 30 min under 20 MPa. Total reducing sugars recovered using SubWH + CO2 were (wet basis): 13.5% for coconut husk, 10% for defatted grape seeds, 13.2% for sugar cane bagasse, and 11.2% for pressed palm fiber. For coconut husk and defatted grape seeds, adding CO2 increased total reducing sugars by 15 and 56%, respectively. For sugar cane bagasse and pressed palm fiber, adding CO2 to the process did not alter total reducing sugars recovered. In all cases, the byproduct yield increased when adding CO2 to the process.

show abstract

“…Comprehensive studies have shown that when such water goes through industrial pipes, solid mineral phases, known as scale, form (Zhang et al, 2013, Rosenberg et al, 2012, which compromises water ow e ciency. One challenge, therefore, is the fact that there are dynamic chemical interactions of the water components that lead to changing phases because of changing physico-chemical parameters (such as conductivity, alkalinity and pH) (Brunner, 2014). Current research has shown that natural organic matter (NOM) in uences chemical interactions of certain species in natural water.…”

Section: Introductionmentioning

confidence: 99%

Geochemical scaling potential simulations of natural organic matter complexation with metal ions in cooling water at Eskom power generation plants in South Africa

Bosire

Ngila

Nkambule

2018

WSA

View full text Add to dashboard Cite

The modified database in the pH, redox equilibrium calculations code (PHREEQC) with a Tipping and Hurley database (T_H.DAT) coupled with the Windermere’s humic acid model (WHAM) was used to simulate scale formation potential in cooling water circuitry, at Eskom power generating stations in South Africa. This study reports a semi-empirical simulative approach in which organic matter fractions, metals and anions in raw and cooling water were used as modelling experimental inputs. By using the saturation index profiles of Ca2+/ Mg2+ with fulvic acid in a modified Tipping and Hurley (T_H.DAT) database, fulvate complex species such as CaFulvate, MgFulvate, and geochemical modelling predictions, mineral phases that potentially precipitate are discussed. Speciation calculations showed that the increase in fulvic acid levels decreased saturation indices of scaling metal phases due to reduced levels of Ca2+ and Mg2+ in the water. Furthermore, if the concentrations of fulvic acid are known, semi-empirical calculations using the geochemical PHREEQC code with a modified T_H.DAT arepossible. Consequently, mineral phase equilibria outputs may give an indication of how the pH and temperature is to be manipulated to optimally predict and control the incidence of scaling.

show abstract

Properties of Mixtures with Water

Cited by 5 publications

References 126 publications

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

Valorization of Residual Biomasses from the Agri-Food Industry by Subcritical Water Hydrolysis Assisted by CO₂

Geochemical scaling potential simulations of natural organic matter complexation with metal ions in cooling water at Eskom power generation plants in South Africa

Contact Info

Product

Resources

About

Properties of Mixtures with Water

Cited by 5 publications

References 126 publications

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

Henry’s Law Constants and Vapor–Liquid Distribution Coefficients of Noncondensable Gases Dissolved in Carbon Dioxide

Valorization of Residual Biomasses from the Agri-Food Industry by Subcritical Water Hydrolysis Assisted by CO2

Geochemical scaling potential simulations of natural organic matter complexation with metal ions in cooling water at Eskom power generation plants in South Africa

Contact Info

Product

Resources

About

Valorization of Residual Biomasses from the Agri-Food Industry by Subcritical Water Hydrolysis Assisted by CO₂