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Received September 16, 2006
Accepted October 19, 2006
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Purification of 2-mercaptobenzothiazole by solvent extraction
Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Patumwun, Bangkok, Thailand 1Department of Organic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, Slovakia (Slovak Republic)
ura.p@chula.ac.th
Korean Journal of Chemical Engineering, March 2007, 24(2), 282-287(6), 10.1007/s11814-007-5042-z
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Abstract
Purification of 2-mercaptobenzothiazole (91.9% purity) by solvent extraction was studied. The extraction of impurities present in crude 2-MBT (e.g. benzothiazole, sulfides and sulfur containing compounds) was carried out at temperatures between 70-180 ℃ using various solvents and their mixtures of different polarity. The highest purity of 2-MBT, above 99% was obtained using nitrobenzene, toluene and ethanol, even at a concentration of 2-MBT above 50 wt%. Increasing temperature and decreasing concentration of the raw material have a positive influence on the purification process. A comparable efficiency of purification was observed also with mixed solvents, (toluene with ethanol, acetone and aniline) possessing the same polarities. A correlation between the polarity indexes (PI) of mixed solvents and experimentally obtained purity of 2-MBT was found. The highest purity of 2-MBT provides extraction of the raw material with mixed solvents having PI 3.8-4.4
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