PROPYLENE OXIDE RECOVERY FROM PROPYLENE OXIDE AND METHANOL MIXTURE Russian patent published in 2009 - IPC C07D301/32 

FIELD: chemistry.

SUBSTANCE: invention refers to method of propylene oxide recovery from mixture (M) containing 5 to 15 weight percent and 50 to 85 methanol weight percent. The disclosed method involves (i) introduction of specified mixture (M) to an extractive distillation column; (ii) additional introduction of polar solvent to specified extractive distillation column; (iii) predistillation of propylene oxide from specified extractive distillation column at bottom temperature 40 to 70°C and pressure 300 to 750 mbar. The polar solvent is water in amount 2 weight percent of mixture (M) or less.

EFFECT: higher recovery.

10 cl, 3 dwg, 2 tbl, 3 ex