Modeling and scale-up of supercritical fluid processes. Part I: Supercritical drying

Lebedev, Artem; Katalevich, A. M.; Menshutina, Natalia

doi:10.1016/j.supflu.2015.06.010

Cited by 41 publications

(16 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Supercritical drying of the obtained alcogels is carried out in an equipment for conducting supercritical processes [ 25 ]. The following process parameters are maintained: Temperature 40 °C, pressure from 120 to 140 bar, carbon dioxide flowrate 500–1000 g/h, drying time 4 h.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation and CFD Modeling of Supercritical Adsorption Process

2020

View full text Add to dashboard Cite

The kinetics of the supercritical adsorption process was experimentally studied by the example of ”ibuprofen-silica aerogel” composition obtainment at various parameters: Pressure 120–200 bar and temperature 40–60 °C. Computational Fluid Dynamics (CFD) model of the supercritical adsorption process in a high-pressure apparatus based on the provisions of continuum mechanics is proposed. Using supercritical adsorption process kinetics experimental data, the dependences of the effective diffusion coefficient of active substance in the aerogel, and the maximum amount of the adsorbed active substance into the aerogel on temperature and pressure are revealed. Adequacy of the proposed model is confirmed. The proposed mathematical model allows predicting the behavior of system (fields of velocity, temperature, pressure, composition, density, etc.) at each point of the studied medium. It makes possible to predict mass transport rate of the active substance inside the porous body depending on the geometry of the apparatus, structure of flow, temperature, and pressure.

show abstract

Section: Methodsmentioning

confidence: 99%

Experimental Investigation and CFD Modeling of Supercritical Adsorption Process

2020

View full text Add to dashboard Cite

show abstract

“…Researchers have used different types of pumps such as HPLC pump [27], membrane pump [28,29], recirculation gear pump [30], nitrogen-driven piston pump [31], air driven pneumatic pump [5,32,33], and syringe pump [34]. Among these, air driven pneumatic pumps are robust and trouble free.…”

Section: Kinetics Of Supercritical Dryingmentioning

confidence: 99%

“…There are examples of downflow [5,29,30,31,35], upflow [28,32,33,36,37], and horizontal flow [27,34] systems in the literature used for laboratory scale supercritical drying. According to our own experience on drying experiments, we recommend the use of the downflow system.…”

Section: Kinetics Of Supercritical Dryingmentioning

confidence: 99%

“…This led to noise like spikes in the measured concentration profiles and difficulty in closing mass balance with a low percent deviation. More commonly, a large number of researchers utilized a cold trap to capture the solvent with almost 100 percent efficiency [5,28,29,32,33,37]. Dry ice bath was used in several studies as the cooling medium decreasing the temperature of the collector vial down to −70 °C [5,33,37].…”

Section: Kinetics Of Supercritical Dryingmentioning

confidence: 99%

“…Some researchers tried to incorporate the transport mechanism via spillage of the solvent by volume expansion into a theoretical model of supercritical drying of ethanol/silica gel system [29,46]. Mixture molar volumes and percent change in the solvent volume were calculated using the Peng-Robinson equation of state with correction for pressure in the pores by Kelvin equation.…”

Section: Kinetics Of Supercritical Dryingmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of Supercritical Drying of Gels

Şahin

Özbakır

İnönü

et al. 2017

Gels

View full text Add to dashboard Cite

Supercritical drying of gels is considered as the most important step of aerogel production since it enables preservation of the three-dimensional pore structure which lead to unique material properties such as high porosity, low density, and large surface area. An understanding of the kinetics of supercritical drying is necessary to provide insight into material development, scale-up, and optimization of the aerogel manufacturing process. Thus, investigation of supercritical drying is gaining increased attention in recent years. This review paper covers the experimental considerations and techniques to study the kinetics of supercritical drying, fundamental mass transfer mechanisms during the drying process and modeling efforts to predict the drying kinetics for varying operating conditions and gel properties. Transport phenomena involving diffusion, convection, spillage by volume expansion, and axial dispersion are discussed by providing the fundamental equations and empirical correlations to predict transfer coefficients. A detailed review of literature covering experimental and theoretical studies on kinetics of supercritical drying is presented.

show abstract

Aerogels

Смирнова¹,

Gurikov²,

Subrahmanyam³

2021

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Aerogels are a class of open nonfluid porous solid materials known for their low density, high specific surface area, and accessible pores. This combination of characteristics makes them highly promising for a wide gamut of applications ranging from thermal and acoustic insulation, catalysts and sensors, adsorbents and absorbents, energy storage, carriers for drug delivery and nutrition, and scaffolds for tissue engineering and regenerative medicine to starting materials for carbon aerogels and porous mixed oxides. Aerogel technology has faced significant bottlenecks in its commercialization, since its discovery in the 1930s, due to limited technical information and processing expertise required for production scaling. This article presents the significant technology developments in the past 10 years, highlighting the paradigm shift in aerogel processing. Lastly, this article invites the reader to envisage and contribute to a new generation of aerogel materials and applications with the fundamental tenets of aerogel production and pore engineering.

show abstract

Modeling and scale-up of supercritical fluid processes. Part I: Supercritical drying

Cited by 41 publications

References 27 publications

Experimental Investigation and CFD Modeling of Supercritical Adsorption Process

Experimental Investigation and CFD Modeling of Supercritical Adsorption Process

Kinetics of Supercritical Drying of Gels

Aerogels

Contact Info

Product

Resources

About