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US 5,710,284 AGranted
Purification of N-vinylpyrrolidone by crystallization
AssigneeBASF SE
InventorsMartin Schmidt-Radde, Herbert Helfert, Bernd Eck, Bernhard Maltry
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Abstract
In a process for purifying N-vinylpyrrolidone by crystallization in a crystallizer, those surfaces of the crystallizer from which crystals grow during the crystallization are covered with an N-vinylpyrrolidone seed layer before the crystallization.
Claims8
A process for purifying N-vinylpyrrolidone by crystallization in a crystallizer, wherein those surfaces of the crystallizer from which crystals grow during the crystallization are covered with an N-vinylpyrrolidone seed layer before the crystallization.
Dependencies are inferred from the claim text.