C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/41 (2006.01) C07C 63/00 (2006.01) C07C 63/04 (2006.01) C07C 63/08 (2006.01)
Patent
CA 2468042
A method for the production of ammonium salts of aromatic carboxylic acids by reaction of an aromatic carboxylic acid with ammonia in an aprotic solvent is disclosed. Said reaction is carried out in a closed vessel and a solution of the aromatic carboxylic acid in an aprotic solvent and gaseous ammonia are continuously introduced into the vessel, such that a partial pressure of ammonia of 0.1 to 3 bars is maintained in the gas chamber of the vessel and a suspension of the ammonium salt separates out in the aprotic solvent. The method permits the production of ammonium salts with defined crystal size and a narrow size distribution.
L'invention concerne un procédé de production de sels d'ammonium d'acides carboxyliques aromatiques, selon lequel on fait réagir un acide carboxylique aromatique avec de l'ammoniac dans un solvant aprotique, cette réaction étant conduite dans une cuve fermée dans laquelle on introduit en continu l'acide carboxylique aromatique dissous dans le solvant aprotique et de l'ammoniac gazeux de telle sorte que l'on maintienne, dans l'espace de tête de la cuve, une pression partielle d'ammoniac comprise dans la plage 0,1-3 bar, puis on extrait le sel d'ammonium en suspension dans le solvant aprotique. Ce procédé permet de produire des sels d'ammonium dont les cristaux sont d'une taille définie, avec une distribution granulométrique étroite.
Bogenstatter Thomas
Franke Dirk
Klopp Ingo
Basf Aktiengesellschaft
Robic
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