Dsm IP Assets B.v.

Hubertus Adrianus Smits

Otto E Sielcken

Imre Toth

Johan Thomas Tinge

Michael S Doelman

Gerardus Wa Hangx

The invention relates to a process to separate butadiene dimers from a mixture comprising butadiene dimers and alkyl-3-pentenoate and/or isomers thereof wherein the butadiene dimers are separated from said mixture by distillation in the presence of an alcohol and in that the distillation is effected at a bottom temperature of between 80 and 200&#xb0; C. Examples of frequent occurring butadiene dimers are 4-vinylcyclohexene and 1,3,7-octatriene. Examples of the alcohol are monohydroxy aliphatic alcohols.

Process to separate butadiene dimers

A continuous hydroformylation process for producing an aldehyde comprising 1) reacting an olefinically unsaturated compound, carbon monoxide and hydrogen in the presence of a rhodium-organobisphosphite complex catalyst at a partial pressure of carbon monoxide and hydrogen, and 2) exposing a mixture comprising at least a portion of the catalyst of 1) to a gaseous mixture comprising hydrogen at a pressure that is greater than the partial pressure of carbon monoxide and hydrogen during the reaction.

Continuous hydroformylation process for producing an aldehyde

A continuous hydroformylation process for forming an aldehyde comprising 1) reacting an olefinically unsaturated compound containing from 2 to 30 carbon atoms with carbon monoxide and hydrogen in the presence of a rhodium-bisphosphite ligand complex catalyst and 2) distilling a mixture comprising at least a part of the catalyst of 1), wherein the distilling is performed in the substantial absence of molecular hydrogen.

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Maastricht, Netherlands

Hubertus Adrianus Smits