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Title: Image analysis of palm oil crystallisation as observed by hot stage microscopy
Authors: Harrison, Peter D.
Smith, Kevin W.
Bhaggan, Krishnadath
Stapley, A.G.F.
Keywords: Crystal morphology
Growth models
Optical microscopy
Growth from melt
Issue Date: 2016
Publisher: © Elsevier
Citation: HARRISON, P. ... et al., 2016. Image analysis of palm oil crystallisation as observed by hot stage microscopy. Journal of Crystal Growth, DOI: 10.1016/j.jcrysgro.2016.03.026.
Abstract: An image processing algorithm previously used to analyse the crystallisation of a pure fat (tripalmitin) has been applied to the crystallisation of a multicomponent natural fat (palm oil). In contrast to tripalmitin, which produced circular crystals with a constant growth rate, palm oil produced speckled crystals caused by the inclusion of entrapped liquid, and growth rates gradually decreased with time. This can be explained by the depletion of crystallisable material in the liquid phase, whereas direct impingement of crystals (the basis of the Avrami equation) was less common. A theoretical analysis combining this depletion with assuming that the growth rate is proportional to the supersaturation of a crystallisable pseudo-component predicted a tanh function variation of radius with time. This was generally able to provide good fits to the growth curves. It was found that growth rate was a relatively mild function of temperature but also varied from crystal to crystal and even between different sides of the same crystal, which may be due to variations in composition within the liquid phase. Nucleation rates were confirmed to vary approximately exponentially with decreasing temperature, resulting in much greater numbers of crystals and a smaller final average crystal size at lower temperatures.
Description: Closed access until 19/03/2017.
Version: Accepted for publication
DOI: 10.1016/j.jcrysgro.2016.03.026
URI: https://dspace.lboro.ac.uk/2134/21630
Publisher Link: http://dx.doi.org/10.1016/j.jcrysgro.2016.03.026
ISSN: 0022-0248
Appears in Collections:Closed Access (Chemical Engineering)

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