Method for the crystallization of 2-(4-N,N-diethyl amino-2-hydroxy benzoyl)-benzoic acid-N-hexyl ester
AssigneeBASF SE
InventorsSamantha Champ, Manfred Hetterich, Günther Gottwald
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Abstract
The present invention relates to a method for the crystallization of n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate, to a method for the production of pourable or flowable particles of crystalline n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate and to specific pourable or flowable particles of crystalline n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate.
Claims16
A method for the crystallization of n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate comprising the steps
- a) providing a clear melt of n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)-benzoate at a temperature above 57° C., and
- b) crystallizing out n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate at a temperature below 57° C.,
- wherein the clear melt from process step a) is stirred at a temperature below 57° C. until opacity arises, before process step b) is carried out and wherein the n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate has an average particle diameter of from 0.1 to 5 mm and a bulk density greater than 0.35 g/ml.
A method for the production of pourable or flowable particles of crystalline n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate having an average particle diameter of from 10 μm to 22 cm comprising the steps
- a′) providing a clear melt of n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)-benzoate at a temperature above 57° C.,
- b′) stirring the melt from process step a′) at a temperature below 57° C. until opacity arises,
- c′) transferring the opaque melt to a mold,
- d′) crystallizing out the transferred melt of n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate at a temperature below 57° C. in the mold,
- e′) removing the crystallized-out n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate from the mold and optionally
- f′) comminuting the crystalline n-hexyl 2-(4-N,N-diethylamino-2-hydroxybenzoyl)benzoate from process step e′) to the desired particle size.
Dependencies are inferred from the claim text.