Patent ID: 8293075

Claim:
A process for the continuous fractional distillation of a mixture comprising morpholine (MO), monoaminodiglycol (ADG), ammonia and water from a reaction of diethylene glycol (DEG) with ammonia, the process comprising: separating off ammonia from the mixture at a top of a first distillation column K 10 ; feeding a bottom fraction from K 10 to a second distillation column K 20 in which water and organic products are separated off at the top at a temperature at the top in the range from 45 to 198° C. and a pressure in the range from 0.1 to 15 bar, feeding a bottom fraction from K 20 to a third distillation column K 30 , wherein the column K 30 is a dividing wall column (DWC) which preferably has a dividing wall (DW) in the longitudinal direction of the column to form an upper combined column region ( 1 ), a lower combined column region ( 6 ), an inflow part ( 2 , 4 ) having an enrichment section ( 2 ) and a stripping section ( 4 ), and also an offtake part ( 3 , 5 ) having an enrichment section ( 3 ) and a stripping section ( 5 ), with the bottoms from K 20 being fed in in the upper or middle third of the inflow part ( 2 , 4 ), based on the number of theoretical plates of the inflow part, ADG and organic products having a boiling point of >190° C. (1.013 bar) being discharged at the bottom, organic products having a boiling point of ≦128° C. (1.013 bar) being discharged at the top and MO being discharged from the middle or lower third of the offtake part ( 3 , 5 ) (side offtake), based on the number of theoretical plates of the offtake part.