N-METHYL-2-PYROLIDONE PURIFICATION METHOD AND PURIFICATION SYSTEM
To provide a technique whereby, when using a vacuum evaporation can to separate and purify NMP from a liquid mixture containing N-methyl-2-pyrolidone (NMP) and water, the resultant purification NMP is prevented from coloring.SOLUTION: The present invention provides a purifying method of vaporizing a...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To provide a technique whereby, when using a vacuum evaporation can to separate and purify NMP from a liquid mixture containing N-methyl-2-pyrolidone (NMP) and water, the resultant purification NMP is prevented from coloring.SOLUTION: The present invention provides a purifying method of vaporizing a treatment liquid containing NMP with a vacuum evaporation can to recover NMP for purification, wherein, when a treatment temperature with the vacuum evaporation can is x[°C] and an NMP recovery rate with the vacuum evaporation can is y[%], the following relations are established: y≤99.95 for x≤100; y≤99.9 for 100 |
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