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

Zainal Abidin @ Murad, Sumaiya and Abdullah, Luqman Chuah and Koay, Gregory Feng Ling and Ahmad, Salmiah and Choong, Thomas Shean Yaw (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

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Official URL: http://dx.doi.org/10.1080/02726351.2010.481583


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
Keyword:crystal habit, crystal morphology, dihydroxystearic acid, solvent crystallization, particle size distribution
Faculty or Institute:Faculty of Engineering
Publisher:Taylor & Francis
ID Code:11273
Deposited By: Anas Yahaya
Deposited On:29 Mar 2011 09:40
Last Modified:06 Jun 2011 03:33

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