US 7,498,451 B2
	Obtaining an aliphatic dialdehyde Monoacetal
Gerd Haderlein, Grünstadt (Germany); Hans-Georg Göbbel, Kallstadt (Germany); and Wolfgang Siegel, Limburgerhof (Germany)
Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany)
Appl. No. 10/536,900 PCT Filed Nov. 27, 2003, PCT No. PCT/EP03/13370 § 371(c)(1), (2), (4) Date May 27, 2005, PCT Pub. No. WO2004/048359, PCT Pub. Date Jun. 10, 2004.
Claims priority of application No. 102 55 647 (DE), filed on Nov. 28, 2002.
Prior Publication US 2006/0058538 A1, Mar. 16, 2006
Int. Cl. C07D 317/26 (2006.01); C07C 45/64 (2006.01)

U.S. Cl. 549—454  [549/347; 549/375; 568/465]

22 Claims

1. 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.