Patent ID: 6271171
Filing Date: 2001-08-07
Classification: B01J,C07C

Abstract:
A process for preparing a catalyst for obtaining .beta.-hydroxy and/or .alpha.,.beta.-unsaturated carbonyl compounds from at least one aldehyde or at least one ketone, provided that the .beta.-hydroxy carbonyl compound is not diacetone alcohol, comprising:calcining hydrotalcite to form a double oxide comprising Mg.sub.1-x Al.sub.x O.sub.1+x,hydrating the double oxide in the absence of CO.sub.2 to form a hydrated double oxide of general formula (I):[(Mg.sup.2+).sub.1-x (Al.sup.3+).sub.x (OH.sup.-).sub.2 ].sup.x+ [(OH.sup.-).sub.x ].sup.x- (H.sub.2 O).sub.n (I)wherein 0.20.ltoreq.x.ltoreq.0.33 and n<1, andrinsing the hydrated double oxide with a water-miscible solvent.