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US 5,856,494 AGranted
Preparation of 2, 2, 6, 6-tetramethylpiperidin-4-one (TAA)
AssigneeBASF SE
InventorsManfred Julius, Dieter Hermeling, Hardo Siegel, Wolfgang Harder
Life of this patent
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Abstract
A process for preparing 2,2,6,6-tetramethylpiperidin-4-one (TAA) is described, wherein a mixture comprising acetone and/or acetone condensates and ammonia in a molar ratio of from 20:1 to 3:1 at from 50.degree. to 130.degree. C. is reacted in the presence of dimethyl sulfate, the amount of dimethyl sulfate being from 0.5 to 5 mol-%, based on acetone.
Claims5
A process for preparing 2,2,6,6-tetramethylpiperidin-4-one (TAA) which comprises subjecting
- a mixture comprising acetone and/or acetone condensates and ammonia in a molar ratio of from 20:1 to 3:1
- at from 50.degree. to 130.degree. C.
- to reaction in the presence of dimethyl sulfate, the amount of dimethyl sulfate being from 0.5 to 5 mol-%, based on acetone.
Dependencies are inferred from the claim text.