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Received May 9, 2013
Accepted August 18, 2013
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Effects of sweating time and cooling strategy on purification of N-vinyl-2-pyrrolidinone using a melt crystallizer
Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Korea 1Department of Chemical Engineering, Kyung Hee University, Suwon 449-701, Korea
jwkang@korea.ac.kr
Korean Journal of Chemical Engineering, November 2013, 30(11), 1997-2000(4), 10.1007/s11814-013-0158-9
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Abstract
A melt crystallization process is proposed to produce high-purity n-vinyl-2-pyrrolidinone (NVP). To produce high purity products, operation strategy plays key role in the melt crystallizer. We investigated the cooling strategy and optimal sweating time using a batch-type melt crystallizer. A slow cooling followed by a slow heating was found to be an effective temperature profile to produce high purity of NVP. The optimal sweating time was found to be about 20 minutes. For industrial application, a cascade melt crystallizer which consists of four stages was constructed and the proposed crystallization/sweating scheme was applied. Using the new melt crystallizer, NVP more than 99.99% purity can be produced in semi-continuous mode.
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References
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