Liquid–liquid centrifugal separation — New equipment for optical (photographic) evaluation at laboratory scale

Eggert, Armin; Sibirtsev, Stephan; Menne, David; Jupke, Andreas

doi:10.1016/j.cherd.2017.09.005

Cited by 10 publications

(8 citation statements)

References 36 publications

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“…Moreover, the silica nanofibers resist environments with a pH ranging from 0 to 10 for at least 24 h. Exposure of samples in demineralized water at 35 °C and an acidic environment of pH 4 at RT for 10 months show no damage or fiber breakage (Figure S9, Supporting Information). Therefore, it can be stated that due to the high efficiency, simplicity, and high speed, the use of silica nanofibrous membranes as separation technique for heterogeneous mixtures is a promising alternative for energy‐intensive and time‐consuming techniques as centrifugation, decantation, or chromatography …”

Section: Resultsmentioning

confidence: 99%

“…Focus is on the separation of one type of azeotropes, namely, heterogeneous binary azeotropic mixtures, into the two pure phases (e.g., toluene–water, methanol–hexane, and ethanol–heptane). This separation, and more in general that of two immiscible liquids into two separated phases, is an important assignment in various sectors, such as (petro‐)chemical, biotechnological, and pharmaceutical, as well as in the food industry . It is illustrated how (super)hydrophobic or (super)hydrophilic electrospun membranes allow separation in a single‐unit operation by using the difference in capillary forces acting on the two phases with fast gravity‐driven separation (bottom of Figure ) .…”

Section: Introductionmentioning

confidence: 99%

“…It is illustrated how (super)hydrophobic or (super)hydrophilic electrospun membranes allow separation in a single‐unit operation by using the difference in capillary forces acting on the two phases with fast gravity‐driven separation (bottom of Figure ) . In this way, energy‐intensive methods such as heteroazeotropic distillation, extraction, centrifugal separation, or decantation can be avoided …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

Loccufier

Geltmeyer

Daelemans

et al. 2018

Adv Funct Materials

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Nanofibrous materials produced through electrospinning are characterized by a high porosity, large specific surface area, and high pore interconnectivity and, therefore, show potential for, e.g., separation and filtration. The development of more inert nanofibers with higher thermal and chemical resistance extends the application field to high-end purification. Silica nanofibrous membranes produced by direct electrospinning of a sol-gel solution without a sacrificing carrier, starting from tetraethoxysilane, meet these challenging requirements. After electrospinning the membrane is highly hydrophobic. Storage under dry conditions preserves this property. Oppositely, a superhydrophilic membrane is obtained by storage under high humidity (month scale). This switch is caused by the reaction of ethoxy groups, present due to incomplete hydrolysis of the precursor, with moisture in the air, resulting in an increased amount of silanol groups. This transition can be accelerated to hour scale by applying a heat treatment, with the additional increase in cross-linking density for temperatures above 400 °C, enabling applications that make use of hydrophobic and hydrophilic membranes by tuning the functionalization. It is showcased that upon designing the water repellent or absorbing nature of the silica material, fast gravity-driven membrane separation of heterogeneous azeotropes can be achieved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

Loccufier

Geltmeyer

Daelemans

et al. 2018

Adv Funct Materials

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“…Among others, academic applications of these reactor setups include studies covering homogeneous transition metal catalysis, photocatalytic and enzymatic reactions, polymer synthesis and solid processing operations like crystallization reactions or aggregationflocculation. Further applications or occurrences of the apparatus include separation processes like blood plasma filtrations 24 or different liquid-liquid mixing and separations such as extraction [25][26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Taylor‐Couette reactor: Principles, design, and applications

et al. 2021

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The Taylor-Couette reactor (TCR) is an apparatus that capitalizes on the Taylor-Couette flow, which allows many flow regimes and conditions to perform (bio-)chemical conversions with precise control of various reactor characteristics. With the possibility to continuously perfuse the reactor with a reaction medium, the TCR becomes interesting for chemical engineering applications. In this review we introduce this reactor type and provide an overview of its history, principles of the flow regimes, and a description and design aspects of the reactors and their elements. Available information in the literature is summarized and harmonized to present available formulas and correlations in a consistent set of variables. Additionally, a wide number of applications in process technology is covered, including reactions in homogeneous, photo and enzymatic catalysis, polymer synthesis, and crystallization and aggregation-flocculation processes. Focusing on this reactor configuration, this article intends to be used as a hub for scientific groups interested in TCRs. This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

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“…Furthermore, centrifugal extractors are used combining the mixing and separating apparatus in one device. Studies focus on the experimental investigation and model-based description of the droplet break-up and coalescence phenomena in the centrifugal field [2,3]. Instead of a pure pumping action the centrifugal pump can be used for two-phase mixing, thus combines two modes of action, pumping and mixing, as a one-device solution [4].…”

Section: Introductionmentioning

confidence: 99%

Droplet Size Distributions of Liquid‐Liquid Dispersions in Centrifugal Pumps

Schmitt

Sibirtsev

Hlawitschka

et al. 2020

Chemie Ingenieur Technik

Self Cite

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Ing. Matthias Kraume on the occasion of his 65th birthday The generation of liquid-liquid dispersions with defined droplet size distributions is an important aspect for process equipment design. In this work, two centrifugal pumps with different impeller diameters were used to generate dispersions at selected operating points for a paraffin oil-water system. The droplet break-up phenomena within the centrifugal pumps were analyzed using a transparent pump design in combination with high-speed imaging. Droplet size distributions at centrifugal pump discharge nozzle were recorded with optical probe measurement technologies and evaluated by means of image processing using a neural network. The influence of impeller diameter, rotational speed, volumetric flow rate and dispersed phase fraction are discussed. Experimental data is correlated using fluid properties, operating data as well as centrifugal pump dimensions. The correlations developed from results of this work serve as a basis for the equipment design of centrifugal pumps.

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Liquid–liquid centrifugal separation — New equipment for optical (photographic) evaluation at laboratory scale

Cited by 10 publications

References 36 publications

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

Taylor‐Couette reactor: Principles, design, and applications

Droplet Size Distributions of Liquid‐Liquid Dispersions in Centrifugal Pumps

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