A comparison of compacting and caking behaviour of carbonate-based washing powders


Two types of sodium carbonate powder produced by spray drying (SD) and dry neutralisation (DN) were studied for their compaction properties using a uniaxial compression tester. Dry neutralised sodium carbonate showed a greater resistance to compression and also produced a weaker compact when compressed to 100kPa. Differential Scanning Calorimetry (DSC) showed that both types of powder were predominantly amorphous in nature. Moisture sorption measurements showed that both powders behaved in a similar way below 50% RH. However, dry neutralised sodium carbonate had a high moisture affinity above this RH. On examining the particle structures using Scanning Electron Microscopy (SEM), the most likely explanation for the increased tendency of spray dried sodium carbonate to form strong compacts was the hollow particle structure.

Additional Information: This is an Author's Accepted Manuscript of an article published in Leaper, M. C., Leach, V., Taylor, P. M., & Prime, D. C. (2013). A comparison of compacting and caking behaviour of carbonate-based washing powders. Drying technology, 31(7), 769-774. Drying technology 2013 © Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/07373937.2012.757553
Uncontrolled Keywords: caking, compaction characteristics, spray drying
Publication ISSN: 0737-3937
Published Date: 2013
Authors: Leaper, M.C.
Leach, V.
Taylor, P.M.
Prime, D.C.


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