Continuous isolation of dihydrocinnamaldehyde for use in perfume applications involves rectification in a system comprising a feed column and a take-off column with combination columns above and below

摘要

A method for the continuous isolation of dihydrocinnamaldehydes (I) from a crude product mixture involves distillation in an integrated system comprising a feed column (A) and a take-off column (D) with combination columns (B, C) at the upper and lower ends, a lateral feed point in (A) and a lateral take-off point in (D) for pure (I). A method for the continuous isolation of dihydrocinnamaldehydes (I) from a crude product mixture involves (i) feeding the mixture into the side of a column (A) with a booster section above and a stripper section below the feed point, the top of (A) being connected (ii) to an upper combination column (B) with a condenser at the top and the bottom of (A) being connected to a lower combination column (C) with a sump heater, while (iii) a take-off column (D) is connected to (B) and (C), and (iv) taking off (I) as a side stream from (D) while lower-boiling and higher-boiling compounds are taken from the top of column (B) and the bottom of column (C) respectively.