Patent ID: 7498451

Claim:
A process for obtaining a pure aliphatic dialdehyde monoacetal comprising a reaction of the corresponding aliphatic dialdehyde or a precursor of the corresponding aliphatic dialdehyde with one or more aliphatic mono- or polyhydric alcohols while distillatively removing water to obtain a reaction mixture which is separated distillatively, said process further comprising carrying out the distillative separation continuously in (i) a dividing wall column to obtain pure aliphatic dialdehyde monoacetal as a sidestream from the dividing wall column, or (ii) in two distillation columns to obtain crude aliphatic dialdehyde monoacetal as a sidestream in the first distillation column, feeding the crude aliphatic dialdehyde monoacetal to the second distillation column, and obtaining pure aliphatic dialdehyde monoacetal as the sidestream from the second distillation column.