Patent ID: 7520964

Claim:
A process for rectificatively separating at least one (meth)acrylic monomer-containing fluid, comprising feeding the at least one (meth)acrylic monomer-containing fluid into a rectification column which comprises at least one sieve tray without a runoff segment, wherein an elementary cell, of parallelogram shape, is obtained from a number of centers of passages present in the at least one sieve tray, and the elementary cell shifts regularly and repeatedly along its edges, the length of each of two shifting vectors being the length of the edge of the elementary cell along which the shifting is effected; an arrangement of the centers of passages of the at least one sieve tray, in at least 90% of all cases, is such that the position of an ideal center and the position of a corresponding real center are separated by ≦1% of half of the sum of the lengths of the two shifting vectors; and an arrangement of the passages, as a whole, of the at least one sieve tray, in at least 90% of all cases, is such that the sum of non-overlapping surface area of an ideal passage with a corresponding real passage and non-overlapping surface area of the corresponding real passage with the ideal passage is ≦1% of the surface area of the ideal passage (S Rem ).