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• W3003911105 abstract "In this study, membrane crystallization is compared to conventional gas–liquid crystallization for the precipitation of ammonium bicarbonate, to demonstrate the distinction in kinetic trajectory and illustrate the inherent advantage of phase separation introduced by the membrane to crystallization in gas–liquid systems. Through complete mixing of gas and liquid phases in conventional crystallization, high particle numbers were confirmed at low levels of supersaturation. This was best described by secondary nucleation effects in analogy to mixed suspension mixed product removal (MSMPR) crystallization, for which a decline in population density was observed with an increase in crystal size. In contrast, for membrane crystallization, fewer nuclei were produced at an equivalent level of supersaturation. This supported the growth of fewer, larger crystals which is preferred to simplify product recovery and limit occlusions. While continued crystal growth was identified with the membrane, this was accompanied by an increase in nucleation rate, which would indicate the segregation of heterogeneous primary nucleation from crystal growth, and was confirmed by experimental derivation of the interfacial energy for ammonium bicarbonate (σ, 6.6 mJ m–2), which is in agreement with that estimated for inorganic salts. The distinction in kinetic trajectory can be ascribed to the unique phase separation provided by the membrane which promotes a counter diffusional chemical reaction to develop, introducing a region of concentration adjacent to the membrane. The membrane also lowers the activation energy required to initiate nucleation in an unseeded solution. In conventional crystallization, the high nucleation rate was due to the higher probability for collision, and the gas stripping of ammonia (around 40% loss) through direct contact between phases which lowered pH and increased bicarbonate availability for the earlier onset of nucleation. It is this high nucleation rate which has restricted the implementation of gas–liquid crystallization in direct contact packed columns for carbon capture and storage. Importantly, this study evidences the significance of the membrane in governing crystallization for gas–liquid chemical reactions through providing controlled phase separation." @default.
• W3003911105 created "2020-02-07" @default.
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• W3003911105 date "2020-01-27" @default.
• W3003911105 modified "2023-10-16" @default.
• W3003911105 title "Is Chemically Reactive Membrane Crystallization Faciliated by Heterogeneous Primary Nucleation? Comparison with Conventional Gas–Liquid Crystallization for Ammonium Bicarbonate Precipitation in a CO₂–NH₃–H₂O System" @default.
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• W3003911105 doi "https://doi.org/10.1021/acs.cgd.9b01276" @default.
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