Аннотация:The process of producing L-Lactide from butyl lactate consists of two stages. In present work optimal conditions for the second stage-depolymerisation of oligomers of butyl lactate were found. Depolymerisation experiments were performed in three types of reactors, the influence of temperature and residual pressure on the yield of by-product - meso-lactide and on productivity of reactor was determined. According to the obtained results, the best type of reactor as well as the optimal conditions for the depolymerisation stage was chosen.