| abstract |
A method for obtaining pure CDON from a mixture containing a low-boiling component, cyclododecanone (CDON), medium-boiling component (MB), cyclododecanol (CDOL), and high-boiling component (HB). SOLUTION: Oxidation of cyclododecane (CDAN) 1, mixture O obtained by dehydrogenation 5 of generated CDOL, a low-boiling component LB is separated in a distillation column 6, and CDON, MB, CDOL obtained from the column bottom , HB-containing first mixture ABC1 is fed to the first side take-out column 7, fraction A1 is taken out from the top of the column, CDOL and HB-containing column bottom liquid C1 are taken out, and contain CDON, CDOL, MB The second mixture ABC2 is fed from the side take-out section to the second side take-out tower 8, the fraction A2 is taken out from the top of the tower, the bottom liquid C2 containing CDOL and HB is taken out, and the third mixture ABC3 is taken into the side. Taking out from the side take-out section, A1 and A2 are combined into one to obtain the target fraction A with an increased CDON. [Selection] Figure 1 |