Abstract

FUENTES, Daria A; DIAZ GRANADOS, Miguel A  and  PERILLA, Jairo E. A METHOD TO OBTAIN HIGH PURITY LACTIDE BY THE DEPOLYMERIZATION OF POLY(LACTIC ACID). Rev.Colomb.Quim. [online]. 2006, vol.35, n.2, pp.115-123. ISSN 0120-2804.

Lactide was synthesized by polycondenzation of lactic acid at 180 °C and a 5.3 kPa for 120 minutes, and a subsequent depolymerization at 220 °C and 5.3 kPa for 40 minutes using dehydrated tin chloride as catalyst. A new reaction separation system was used, collecting the lactide in solid form and leaving water and lactic acid as vapor. This guarantees a high purity product and avoids any reversible reaction of lactide.

Keywords : Lactic Acid; poly(lactic acid); lactide; biodegradable polymers.

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