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Solvent crystallization of palm based dihydroxystearic acid with isopropyl alcohol: effects of solvent quantity and concentration on particle size distribution, crystal habit and morphology, and resultant crystal purity


Citation

Koay, Gregory Feng Ling and Chuah, Teong Guan and Zainal Abidin @ Murad, Sumaiya and Ahmad, Salmiah and Choong, Thomas Shean Yaw (2011) Solvent crystallization of palm based dihydroxystearic acid with isopropyl alcohol: effects of solvent quantity and concentration on particle size distribution, crystal habit and morphology, and resultant crystal purity. Industrial Crops and Products, 34 (1). pp. 1135-1140. ISSN 0926-6690; ESSN: 1872-633X

Abstract

Crude dihydroxystearic acid was prepared from palm based oleic acid and was then solvent purified with isopropyl alcohol in a custom fabricated simultaneous batch crystallizer unit. The crystallized dihydroxystearic acid was a functional ingredient that acted as multipurpose intermediate for synthesis of various fine chemicals, cosmetics and personal care products. The effects of solvent quantity and concentration on particle size distribution, crystal habit and morphology, and resultant crystal purity were studied. The crystals were purer but smaller and the span of the distribution curve was wider at higher solvent quantity and concentration. Through scanning electron microscopy and X-ray diffraction, it was observed that the crystals agglomerated into plate-like (flaky) habit with triclinic crystal structure. Solvent crystallization with 80% IPA at 20°C and solute:solvent ratio of 1.0:1.0 was the most optimized and efficient, producing β-DHSA crystals that has high resistance against fat exudation during vacuum filtration process.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Institute of Tropical Forestry and Forest Products
DOI Number: https://doi.org/10.1016/j.indcrop.2011.03.030
Publisher: Elsevier
Keywords: Dihydroxystearic acid; Solvent crystallization; Simultaneous batch crystallizer; Functional ingredient; Process optimization
Depositing User: Nabilah Mustapa
Date Deposited: 03 Dec 2015 07:38
Last Modified: 03 Dec 2015 07:38
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.indcrop.2011.03.030
URI: http://psasir.upm.edu.my/id/eprint/23053
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