The processing of a CDON/CDOL mixture by means of a sequence of side withdrawal columns

摘要

Removing a cyclododecanone-rich fraction from a dehydrogenation mixture comprising low boilers, cyclododecanone, medium boilers, cyclododecanol and high boilers, comprises: (a) feeding the dehydrogenation mixture to a preliminary separator column; (b) distillatively removing the low boilers from the dehydrogenation mixture to obtain a first mixture comprising cyclododecanone, medium boilers, cyclododecanol and high boilers; (c) feeding the first mixture into a primary side draw column (7); and (d) drawing off a first cyclododecanone-rich fraction from the top of the primary side draw column. Removing a cyclododecanone-rich fraction from a dehydrogenation mixture comprising low boilers, cyclododecanone, medium boilers, cyclododecanol and high boilers, comprises: (a) feeding the dehydrogenation mixture to a preliminary separator column; (b) distillatively removing the low boilers from the dehydrogenation mixture to obtain a first mixture comprising cyclododecanone, medium boilers, cyclododecanol and high boilers; (c) feeding the first mixture into a primary side draw column (7); (d) drawing off a first cyclododecanone-rich fraction from the top of the primary side draw column; (e) drawing off a first fraction comprising cyclododecanol and high boilers from the bottom of the primary side draw column; (f) drawing off a second mixture comprising cyclododecanone, cyclododecanol and medium boilers from the side draw of the primary side draw column; (g) feeding the second mixture into a secondary side draw column; (h) drawing off a second cyclododecanone-rich fraction from the top of the secondary side draw column; (i) drawing off a second fraction comprising cyclododecanol and high boilers from the bottom of the secondary side draw column; (j) drawing off a third mixture comprising cyclododecanone, cyclododecanol and medium boilers from the side draw of the secondary side draw column; and (k) combining the first cyclododecanone-rich fraction and the second cyclododecanone-rich fraction to obtain the cyclododecanone-rich target fraction.