OP-II-3

PP-III-28Different reaction conditions had been varied for these reactors in both stages ofprocess: temperature, pressure, type of catalyst, contact time, medium.ResultsThe best results on synthesis of BLAO were obtained in the semibatch mixedreactor. The process can be carried out catalytically under temperature 170-180°C.Reaction should be conducted preferably under continuous flow of N 2 in order tofacilitate butanol removing. This method provides to produce BLAO with degree ofoligomerisation in the range of n = 9-10; with yield up to 95% and specific capacityabout 15-20 g (BLAO)/(l×h). The most active catalyst on this stage is tin (II) octoatewith concentration 0,5% wt.The best results on synthesis of lactide were obtained in the molecular distillationevaporator working in the continuous flow regime. The process preferably wascarried out with catalyst witch was added on the stage of producing BLAO undervacuum (pressure = 1-5 torr) and temperature 220°C. This method provides toproduce lactide with yield up to 90 % and specific capacity of reactor (concerningevaporation surface) 3,5 kg(lactide)/(m2×h).ConclusionsThe three types of reaction units were examined for two reactions:oligomerisation of butyllactate and formation of lactide. The best reactor type andreaction conditions were experimentally determined for both of processes.491