Abstract
For the first time, continuous ultrasound assisted tubular crystallizer dynamics is studied in pilot scale operation. It is vital to understand process dynamics for continuous crystallizers as robust crystallization processes are developed. The mixing time using tracer impulses and experimental continuous crystallization runs to understand the performance of process variables, with focused beam reflectance measurement (FBRM), process video microscope measurements and off-line particle size analytics are reported. Model system was phthalic acid crystallization from water. The effect of power ultrasound and residence time on the crystallization dynamics and on the product crystal size distribution (CSD) were studied. The use of ultrasound was found to be vital in the crystallization operations in order to prevent pipe clogging. It was shown that ultrasound power increase improves mixing in tubular reactors, and it decreases the product CSD. Also, residence time increase decreases the CSD. It increases ultra...
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