| abstract |
The invention relates to a process for the separation of a cyclododecanone-rich target fraction (A) from a low boiler (LB), cyclododecanone (CDON), medium boiler (MB), cyclododecanol (CDOL) and high-boiling (HB) containing dehydrogenation mixture (O). It is an object of the invention to provide a process for working up a mixture comprising low boilers, CDON, medium boilers, CDOL and high boilers, in which a target fraction is obtained, which consists of pure CDON as possible. This problem is solved by means of a sequence of two side draw columns connected in series, the side stream of the primary side draw column being fed into the secondary side draw column. From the top of both side draw columns, one CDON-rich fraction is withdrawn each, which are combined to form a target fraction which is essentially pure CDON. |