Workup of a cyclododecanone cyclododecanol mixture in a sequence of side draw columns
AssigneeEvonik Degussa GmbH
InventorsLuca Cameretti, Daniel Demicoli, Ralf Meier
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Abstract
A process for removing a cyclododecanone-rich target fraction (A) from a dehydrogenation mixture (O) comprising low boilers (LB), cyclododecanone (CDON), medium boilers (MB), cyclododecanol (CDOL) and high boilers (HB) is provided. According to the process, substantially pure CDON is obtained via a distillative sequence of two side draw columns connected in series, wherein the sidestream of the primary side draw column is fed into the secondary side draw column. From the top of each of the two side draw columns, a CDON-rich fraction is drawn off, and these are combined to form a target fraction, which is essentially pure CDON.
Claims13
A process for removing a cyclododecanone-rich fraction (A) from a dehydrogenation mixture (O), the dehydrogenation mixture (O) comprising:
- components having a boiling point less than cyclododecanone (CDON) (LB);
- cyclododecanone (CDON);
- components having a boiling point between CDON and cyclododecanol (CDOL) (MB);
- cyclododecanol (CDOL);
- and
- components having a boiling point above CDOL (HB);
- the process comprising:
- a) feeding the dehydrogenation mixture (O) to a preliminary separator column;
- b) distillatively removing the LB components from the dehydrogenation mixture (O) to obtain a first mixture (ABC1) comprising the cyclododecanone (CDON), the MB components, the cyclododecanol (CDOL) and the HB components;
- c) feeding the first mixture (ABC1) into a primary side draw column (7);
- d) drawing off a first cyclododecanone-rich fraction (A1) from the top of the primary side draw column (7);
- e) drawing off a first fraction (C1) comprising cyclododecanol (CDOL) and the HB components from the bottom of the primary side draw column (7);
- f) drawing off a second mixture (ABC2) comprising cyclododecanone (CDON), cyclododecanol (CDOL) and the MB components from the side draw of the primary side draw column (7);
- g) feeding the second mixture (ABC2) into a secondary side draw column (8);
- h) drawing off a second cyclododecanone-rich fraction (A2) from the top of the secondary side draw column (8);
- i) drawing off a second fraction (C2) comprising cyclododecanol (CDOL) and the HB components from the bottom of the secondary side draw column (8);
- j) drawing off a third mixture (ABC3) comprising cyclododecanone (CDON), cyclododecanol (CDOL) and the MB components from the side draw of the secondary side draw column (8);
- k) combining the first cyclododecanone-rich fraction (A1) and the second cyclododecanone-rich fraction (A1) to obtain the cyclododecanone-rich target fraction (A).
Dependencies are inferred from the claim text.