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

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

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1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)1997-2000
Number of pages4
JournalKorean Journal of Chemical Engineering
Issue number11
Publication statusPublished - 2013 Nov 1



  • Cascade Melt Crystallizer
  • Cooling Strategy
  • Melt Crystallization
  • N-vinyl-2-pyrrolidinone
  • Sweating

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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