Process for the preparation of sodium salt of ibuprofen of...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/41 (2006.01) C07C 51/44 (2006.01) C07C 51/46 (2006.01) C07C 51/47 (2006.01) C07C 57/30 (2006.01)

Patent

CA 2659865

A free-flowing hydrated sodium salt of ibuprofen of controlled median particle size and water content is provided. It can be produced by adding aqueous NaOH to a non-boiling solution or slurry of ibuprofen in an organic solvent that can be distilled along with water at a temperature in the range of 50 to 120°C. The rate of NaOH addition is at a rate that does not cause the resultant reaction mixture to boil before the addition has been completed. After completing the addition, the water is removed with some of the organic solvent by distillation. After cooling, the hydrated sodium salt of ibuprofen is recovered from the resultant slurry. The process enables the median particle size of the sodium salt of ibuprofen formed to be controlled by selection and use of a predetermined effective concentration of NaOH in the aqueous NaOH solution used.

L'invention concerne un sel de sodium d'ibuprofène hydraté à écoulement libre à dimension de particule et teneur en eau moyennes. Ce sel peut être produit par addition de NaOH aqueux à une solution ou une suspension d'ipubrofène sans ébullition dans un solvant organique qui peut être distillé avec de l'eau à une température comprise entre 50 et 120 °C. Le taux d'addition de NaOH se situe à un taux n'entraînant pas l'ébullition du mélange de réaction obtenu avant l'achèvement de l'addition. Après achèvement de l'addition, l'eau, et certains solvants organiques sont éliminés par distillation. Après refroidissement, le sel de sodium d'ibuprofène hydraté est récupéré de la suspension obtenue. Le procédé permet à la dimension de particule moyenne du sel de sodium d'ibuprofène formé d'être contrôlée par sélection et utilisation d'une concentration efficace prédéfinie de NaOH dans la solution de NaOH aqueuse utilisée.

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