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Solid separation from a mixed suspension through electric-field-enhanced crystallization

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Author: Li, W.W. · Radacsi, N. · Kramer, H.J.M. · Heijden, A.E.D.M. van der · Horst, J.H. ter
Publisher: Wiley-VCH Verlag
Source:Angewandte Chemie - International Edition, 52, 55, 16088-16091
Identifier: 575379
doi: doi:10.1002/ange.201609832
Keywords: Crystal engineering · Dielectrophoresis · Electrophoresis · Multicomponent mixtures · Separation technology · Crystal engineering · Electric fields · Electrodes · Electrophoresis · Separation · Crystal separation · Crystalline compounds · Electric field-enhanced crystallization · Industrial processs · Inhomogeneous electric fields · Multicomponent mixture · Separation technologies · Subsequent cooling · Suspensions (fluids) · Observation, Weapon & Protection Systems · EM - Energetic Materials · TS - Technical Sciences


When applied to a pure component suspension in an apolar solvent, a strong inhomogeneous electric field induces particle movement, and the particles are collected at the surface of one of the two electrodes. This new phenomenon was used to separately isolate two organic crystalline compounds, phenazine and caffeine, from their suspension in 1,4-dioxane. First, crystals of both compounds were collected at different electrodes under the influence of an electric field. Subsequent cooling crystallization enabled the immobilization and growth of the particles on the electrodes, which were separately collected after the experiment with purities greater than 91 %. This method can be further developed into a technique for crystal separation and recovery in complex multicomponent suspensions of industrial processes. © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim