C - Chemistry – Metallurgy – 12 – P
Patent
C - Chemistry, Metallurgy
12
P
C12P 7/56 (2006.01) C12P 7/62 (2006.01)
Patent
CA 2695458
The invention relates to a process for the production and isolation of lactic acid, the lactic acid being produced by way of fermentation of a carbohydrate-bearing feedstock and the addition of ammonia, the lactic acid being released from the ammonium salt of the lactate by adding a mineral acid and the lactic acid isolation taking place by extraction with the aid of an alkylated amine; the said extraction is preferably operated at a pH value of 4.0 to 2.0, thereby obtaining a multi-phase mixture which is split up; the phase thus obtained with the lactate salt of amine subsequently undergoing distillation, so that lactic acid is obtained as pure product or the said phase with the lactate salt of amine are thermally decomposed, thereby producing an oligolactide that is distillable and thus yields a pure dilactide The invention also encompasses a device suitable for the performance of the inventive process.
L'invention concerne un procédé de préparation et d'isolation d'acide lactique, dans lequel l'acide lactique est préparé par fermentation et addition d'ammoniac à un matériau de départ contenant des hydrates de carbone, et la libération de l'acide lactique du sel d'ammonium de lactate par addition d'un acide minéral ainsi que l'isolation de l'acide lactique par extraction à l'aide d'une amine alkylée, cette extraction ayant lieu de préférence à un pH d'une valeur de 4,0 à 2,0. Il se forme un mélange polyphasé qui est dissocié, suite à quoi la phase qui présente le sel lactate de l'amine est distillée, l'acide lactique étant obtenu sous la forme d'un produit pur, ou la phase qui présente le sel lactate de l'amine est décomposée thermiquement, ce qui fournit un oligolactide qui peut être distillé pour fournir un dilactide pur. L'invention concerne également un dispositif qui permet d'exécuter ce procédé.
Boesmann Andreas
Schulze Joachim
Tietz Wolfgang
Wasserscheid Peter
Fetherstonhaugh & Co.
Uhde Gmbh
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