Patent ID: 7393436
Filing Date: 2008-07-01
Classification: B01D,C07C,Y10S

Abstract:
1. A thermal separating process for removing at least one stream containing enriched (meth)acrylic monomers from a mixture containing (meth)acrylic monomers and components other than (meth)acrylic monomers, comprising conducting a continuous steady-state operation in at least one thermal separating apparatus which comprises a separating space with or without separating internals, into which separating space at least one stream containing (meth)acrylic monomers is conducted and out of which at least one stream containing (meth)acrylic monomers is conducted, wherein the at least one stream conducted altogether into the separating space contains, based on its total amount, X % by weight of components other than (meth)acrylic monomers, the at least one stream which is conducted out of the separating space with the highest proportion by weight of (meth)acrylic monomers contains Y % by weight of components other than (meth)acrylic monomers, the X %:Y % ratio is ≧5, the separating space, except at the stream inlet and at the stream outlet points, is bounded by a solid phase and comprises at least one circulation heat exchanger, and the total volume filled with liquid phase in the separating space is ≧1 m wherein, in the case that the separating space is divided into n individual volume elements i and the highest and the lowest temperatures of the liquid phase disposed in an individual volume element i do not differ by more than 2° C. and the volume element i is continuous within the separating space, the overall residence time t is ≦20 h, where A=(T T T m {dot over (m)} such that the sum over all volume elements i includes neither volume elements i having a liquid phase mass m