Method for lactic acid oligomerization

Details Method for lactic acid oligomerization Method for lactic acid oligomerization

B - Operations, Transporting

01

D

B01D 3/00 (2006.01) B01J 19/24 (2006.01) C07C 67/08 (2006.01) C07C 67/465 (2006.01)

Patent

CA 2474720

The invention concerns a method for continuously producing a dimer-rich and trimer-rich oligomeric lactic acid composition, starting with a lactic composition by eliminating water from said lactic acid composition. The invention is characterized in that it consists in: carrying out said elimination in an adiabatic reactor provided with a recycling loop, continuously introducing a lactic acid composition in a circulating starter reaction medium, said reaction medium being brought to a temperature ranging between 120·C and 180·C and in eliminating the water in vapour form.

L'invention concerne un procédé continu d'obtention d'une composition oligomérique d'acide lactique riche en dimère et en trimère, à partir d'une composition d'acide lactique par élimination d'eau de ladite composition d'acide lactique, caractérisé en ce que l'on réalise cette élimination dans un réacteur adiabatique muni d'une boucle de recirculation, que l'on introduit en continu une composition d'acide lactique dans un milieu réactionnel pied de cuve en circulation, ledit milieu réactionnel étant porté à une température allant de 120~C à 180~C et que l'on élimine l'eau sous forme vapeur.

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