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US 6,888,006 B2Granted
Method for processing pyrollidone and n-vinyl pyrollidone residues
AssigneeBASF SE
InventorsHerbert Helfert, Martin Schmidt-Radde, Gerhard Laqua, Ulrich Eiden, Stephan Scholl, Christoph Übler
Life of this patent
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Abstract
A process for working up residues from the preparation of pyrrolidone and/or N-vinylpyrrolidone comprises subjecting the residues to a thermolysis.
Claims7
A process for working up residues from the preparation of pyrrolidone and/or N-vinylpyrrolidone, which comprises
- combining a residue from the preparation of pyrrolidone and a residue from the preparation of N-vinylpyrrolidone to obtain combined residues, and
- subjecting the combined residues to a thermolysis, which is carried out at a residence time, based on the residues used, of from 1 to 10 hours.
Dependencies are inferred from the claim text.