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Title: | Ultrasonic precipitation of manganese carbonate: Reactor design and scale-up | Authors: | GIELEN, Bjorn Thimmesch, Y. JORDENS, Jeroen JANSSEN, Geert THOMASSEN, Leen Van Gerven, Tom BRAEKEN, Leen |
Issue Date: | 2016 | Source: | CHEMICAL ENGINEERING RESEARCH & DESIGN, 115, p. 131-144 | Abstract: | This study discusses the reactor design and a possible scale-up strategy for ultrasonic precipitation of manganese carbonate. Preliminary experiments, performed in a 200 mL continuously stirred tank reactor (CSTR) equipped with an ultrasonic transducer or probe, identified the importance of generating a homogenously distributed ultrasonic field of about 40 kHz to improve the sphericity of the powder. In this lab-scale reactor, spherical particles with a tap density of more than 2.0 g/cm(3) were obtained under sonication, compared to only 1.3 g/cm(3) during silent conditions. Alternatively, a design with an ultrasonic unit in a recirculation loop resulted in a similar relative improvement compared to silent conditions. However, since the recirculation reactor did not reach a tap density of above 2.0 g/cm(3), the scale-up of this configuration was discarded. In the end, a basic CSTR was scaled to 50 L by using a single radial oscillating probe, operating at 40 kHz and 1 kW. This semi-pilot scale reactor was able to produce particles with a tap density of about 90% of the value attained at lab-scale although the power density was reduced by more than half. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. | Keywords: | ultrasonic precipitation; particle engineering; reactor design; scale-up | Document URI: | http://hdl.handle.net/1942/26492 | ISSN: | 0263-8762 | e-ISSN: | 1744-3563 | DOI: | 10.1016/j.cherd.2016.09.012 | ISI #: | 000389110400013 | Rights: | (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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