Improvement on Productive Process of Lactide
Guo Xi-kun · Fain kemikaru · 2004
Zinc oxide,stannous chloride,stannous sulfate,stannous octanoate and their mixture were used as catalyst for the synthesis of lactide.The results showed that variety and quantity of the catalyst had marked influence on the yield of lactide.Thus,with 2% (based on total mass of reactants) ZnO/Sn(Oct)_2,yield of lactide reached 45.2%.Meanwhile,distilling lactide under reduced pressure of 400 Pa in N_2 stream of 2 L/min,the yield was 8.1% higher than that by traditional vacuum distillation.In addition,a device,which could seperate lactide from lactic acid effectively,was used to receive the lactide in the productive process.