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Effect of Solvent Concentration and Cooling Modes on Morphology, Particle Size Distribution, and Yield of Dihydroxystearic Acid (DHSA) Crystals

Sumaiya, Zainal Abidin and Luqman Chuah, Abdullah and Koay, Gregory F. L. and Salmiah, A. and P., Siwayanan and Choonga, Thomas S. Y. (2010) Effect of Solvent Concentration and Cooling Modes on Morphology, Particle Size Distribution, and Yield of Dihydroxystearic Acid (DHSA) Crystals. Particulate Science and Technology, 28 (3). pp. 236-246. ISSN 0272-6351 (Print); 1548-0046 (Online)

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Abstract

Palm-based dihydroxystearic acid was purified by employing solvent crystallization using ethanol and ethanol/water mixture as solvents. Two different cooling modes, rapid and natural cooling, were employed for the crystallization process. In this study, the cooling effects on morphology, habit, particle size distribution, and yield of dihydroxystearic acid crystals were investigated. The dihydroxystearic acid crystals appeared to agglomerate into sphere-like and plate-like structures, depending on the cooling modes and the presence of water. By manipulating the solvent and cooling modes, the crystal yield ranged from 0.8% to 42.1%, while the crystal purity ranged from 73.3% to 91.4%. Solvent crystallization using ethanol was best achieved through natural cooling with the dihydroxystearic acid to ethanol ratio of 1.0:1.0, which produced the narrowest particle size distribution curve with the largest average particle size

Item Type: Article
Uncontrolled Keywords: crystal habit, crystal morphology, dihydroxystearic acid, solvent crystallization, particle size distribution
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 09 May 2016 01:39
Last Modified: 18 Apr 2018 01:50
URI: http://umpir.ump.edu.my/id/eprint/8278
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