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Effects of sweating time and cooling strategy on purification of N-vinyl-2-pyrrolidinone using a melt crystallizer

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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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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 136-701, Korea

    Sun Hyung Kim, Myoung Do Seo, Moon Seon Tak, Dae Ryuk Yang & Jeong Won Kang

  2. Department of Chemical Engineering, Kyung Hee University, Suwon, 449-701, Korea

    Woo Sik Kim

Authors
  1. Sun Hyung Kim
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  2. Myoung Do Seo
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  3. Moon Seon Tak
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  4. Woo Sik Kim
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  5. Dae Ryuk Yang
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  6. Jeong Won Kang
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Correspondence to Jeong Won Kang.

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Kim, S.H., Seo, M.D., Tak, M.S. et al. Effects of sweating time and cooling strategy on purification of N-vinyl-2-pyrrolidinone using a melt crystallizer. Korean J. Chem. Eng. 30, 1997–2000 (2013). https://doi.org/10.1007/s11814-013-0158-9

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  • DOI: https://doi.org/10.1007/s11814-013-0158-9

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