DEVICE AND METHOD FOR SEPARATING A CYCLIC DIESTER FROM POLYMER MELTS

摘要

The present invention relates to a device and also to a method for separating and recovering a cyclic diester, in particular dilactide or glycolide from polymer melts which include the cyclic diester as impurity. The device and also the method according to the invention allow recovery of the cyclic diester with a high yield and at the same time high purity.

主权项

1. A device for separating and recovering a cyclic diester of general Formula I R being selected from hydrogen or linear or branched aliphatic radicals with 1 to 6 carbon atoms, from polymer melts, comprising the diester of general formula I, which comprises
a) at least one demonomerisation device for removing the diester of general Formula I in gaseous aggregate state from the polymer melt,b) at least one separation device, which is connected subsequent to the at least one demonomerisation device and which is in fluidic connection with the at least one demonomerisation device, for separating the diester of general Formula I, in which the diester of general Formula I is converted via the solid into the liquid aggregate state, andc) at least one device for producing a vacuum which is connected subsequent to the at least one separation device and which is in fluidic connection with the at least one separation device.