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A novel method of quantifying the coating progress in a three-dimensional prismatic spouted bed

Particuology 2019年第1期17卷 137-145页

作者： Swantje Pietscha Finn Ole Poppinga Stefan Heinrich Michael Müller Michael Schonherr frank kleine jager Hamburg University of Technology Institute of Solids Process Engineering and Particle TechnologyDenickestraβe 1521073 HamburgGermany BASF SE RCP/TT67056 LudwigshafenGermany

An optical method of experimentally quantifying the coating progress in a laboratory prismatic spouted bed is presented. Microcrystalline cellulose particles with size dp = 0.57 mm are used as core material. Waterborne coating suspensions with methylene blue as a dye are used and sprayed via a two-fluid nozzle in bottom-spray configuration. A high-speed camera with a color filter is positioned in front of the observation window of the three-dimensional plant and records the flow pattern in the process chamber with a certain frequency. With increasing surface coverage, the particles become bluer and darker. The change in brightness is detected by digital image analysis. In the implemented algorithm, the spherical particles are detected, cut from the background and normalized regarding their lighting and area. The detection of coated pixels on the single particles allows the calculation of the coating fraction and coating uniformity after a Kalman filter has been applied to reduce noise. It is shown that the method can be used to determine the time needed to reach the maximum blue value indicating a complete coating of the particle bed. Besides the minimum coating duration, information on the spraying performance (e.g., the time point of a possibly occurring blockage of the nozzle) can be obtained from the data. Two exemplary experiments are presented, showing a connection of the slope of the coating fraction and the uniformity of the coating of the particles in the apparatus that results in the recommendation of a slow liquid injection for obtaining consistent coating layers as desired in many applications.

关键词： Spouted bed Particle coating Granulation Digital image analysis

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Retrospect and prospect: 30 years of Formula conferences!

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Particuology 2019年第3期17卷 3-6页

作者： Alain Durand Jordi Esquena Ning Yang Guanghui Ma Ying Ren frank kleine jager Bernd Sachweh Universite de Lorraine CNRS LCPM F-54000 Nancy France Institute of Advanced Chemistry of Catalonia CSIC 08034 Barcelona Spain Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China BASF SE 67056 Ludwigshafen Germany BASF Advanced Chemicals Co. Ltd. No 300 Shanghai 20013乙 China

The history of Formula conferences was summarized with a particular focus on Formula I and Formula Ⅸ (the first and last conferences of the series).The foundation of formulation during the middle of the 1980s by people from academia and industry in the fields of chemistry and chemical engineering was briefly *** current trends in formulation as well as in product engineering were listed.

关键词： Formulation Engineering Product Formula conferences

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