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Effects of sweating time and cooling strategy on purification of N-vinyl-2-pyrrolidinone using a melt crystallizer
- Authors
- Kim, Sun Hyung; Do Seo, Myoung; Tak, Moon Seon; Kim, Woo Sik; Yang, Dae Ryuk; Kang, Jeong Won
- Issue Date
- 11월-2013
- Publisher
- KOREAN INSTITUTE CHEMICAL ENGINEERS
- Keywords
- N-vinyl-2-pyrrolidinone; Melt Crystallization; Sweating; Cooling Strategy; Cascade Melt Crystallizer
- Citation
- KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.30, no.11, pp.1997 - 2000
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- KOREAN JOURNAL OF CHEMICAL ENGINEERING
- Volume
- 30
- Number
- 11
- Start Page
- 1997
- End Page
- 2000
- ISSN
- 0256-1115
- 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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