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Schmalenberg M, Mensing L, Lindemann S, Krell T, Kockmann N. Miniaturized draft tube baffle crystallizer for continuous cooling crystallization. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2021.12.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Sonnenschein J, Wohlgemuth K. Archimedes tube crystallizer: Design and characterization for small-scale continuous crystallization. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2021.12.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mathew Thomas K, Nyande BW, Lakerveld R. Design and Characterization of Kenics Static Mixer Crystallizers. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.01.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Continuous Cooling Crystallization in a Coiled Flow Inverter Crystallizer Technology—Design, Characterization, and Hurdles. Processes (Basel) 2021. [DOI: 10.3390/pr9091537] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Continuous small-scale production is currently of utmost interest for fine chemicals and pharmaceuticals. For this purpose, equipment and process concepts in consideration of the hurdles for solids handling are required to transfer conventional batch processing to continuous operation. Based on empirical equations, pressure loss constraints, and an expandable modular system, a coiled flow inverter (CFI) crystallizer with an inner diameter of 1.6 mm was designed. It was characterized concerning its residence time behavior, tested for operation with seed crystals or an ultrasonic seed crystal unit, and evaluated for different purging mechanisms for stable operation. The residence time behavior in the CFI corresponds to ideal plug flow behavior. Crystal growth using seed crystals was demonstrated in the CFI for two amino acids. For fewer seed crystals, higher crystal growth rates were determined, while at the same time, secondary nucleation was observed. Feasibility for the interconnection of a sonicated seeding crystal unit could be shown. However, the hurdles are also identified and discussed. Prophylactic flushing combined with a photosensor for distinguishing between solvent and suspension phase can lead to stable and resource-efficient operation. The small-scale CFI technology was investigated in detail, and the limits and opportunities of the technology are presented here.
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Abstract
AbstractNucleation in continuously operated capillary coiled cooling crystallizers is experimentally investigated under the influence of ultrasound. It was found that there is no sharp boundary but rather a transition zone for nucleation under sonication. For this purpose, a tube with an inner diameter of 1.6 mm and a length of 6 m was winded in a coiled flow inverter (CFI) design and immersed into a cooled ultrasonic bath (37 kHz). The CFI design was chosen for improved radial mixing and narrow residence time distribution, which is also investigated. Amino acid l-alanine dissolved in deionized water is employed in a supersaturation range of 1.10 to 1.46 under quiet and sonicated conditions. Nucleation is non-invasive detected using a flow cell equipped with a microscope and camera.
Graphical abstract
Since the interest and demand for small-scale, continuous crystallization increases, seed crystals were generated in a coiled tube via sonication and optically investigated and characterized. No distinct threshold for nucleation could be determined in a wide range of supersaturations of l-alanine in water
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Benitez-Chapa AG, Nigam KDP, Alvarez AJ. Process Intensification of Continuous Antisolvent Crystallization Using a Coiled Flow Inverter. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04160] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrea G. Benitez-Chapa
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N. L. 64849, México
| | - Krishna D. P. Nigam
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N. L. 64849, México
- Indian Institute of Technology Delhi, Department of Chemical Engineering, Hauz Khas, New Delhi 110016, India
| | - Alejandro J. Alvarez
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N. L. 64849, México
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Krieger W, Hörbelt M, Schuster S, Hennekes J, Kockmann N. Kinetic Study of Leuco‐Indigo Carmine Oxidation and Investigation of Taylor and Dean Flow Superposition in a Coiled Flow Inverter. Chem Eng Technol 2019. [DOI: 10.1002/ceat.201800753] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Waldemar Krieger
- TU Dortmund UniversityDepartment of Biochemical and Chemical Engineering, Laboratory of Equipment Design Emil-Figge-Strasse 68 44227 Dortmund Germany
| | - Max Hörbelt
- TU Dortmund UniversityDepartment of Biochemical and Chemical Engineering, Laboratory of Equipment Design Emil-Figge-Strasse 68 44227 Dortmund Germany
| | - Simon Schuster
- TU Dortmund UniversityDepartment of Biochemical and Chemical Engineering, Laboratory of Equipment Design Emil-Figge-Strasse 68 44227 Dortmund Germany
| | - Julian Hennekes
- TU Dortmund UniversityDepartment of Biochemical and Chemical Engineering, Laboratory of Equipment Design Emil-Figge-Strasse 68 44227 Dortmund Germany
| | - Norbert Kockmann
- TU Dortmund UniversityDepartment of Biochemical and Chemical Engineering, Laboratory of Equipment Design Emil-Figge-Strasse 68 44227 Dortmund Germany
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