Other

E.i. Dupont De Nemours and Company

Dsm N.v.

Peter C Borman

Onko Jan Gelling

Petrus W Van Leeuwen

The invention relates to a process to separate linear 5-formylvalerate compound from a crude mixture comprising 5-formylvalerate compound and 2-, 3- and/or 4-formylvalerate compound by vacuum distillation, wherein the distillation is performed in the presence of a phenolic compound with a boiling point which is at least 10&deg; C. higher than the boiling point of the 5-formylvalerate at 0.1-100 kPa.

Process to separate linear alkyl 5-formylvalerate

Process for the continuous preparation of an alkyl 5-formylvalerate by reacting an alkyl-3-pentenoate with carbon monoxide and hydrogen by hydroformylation using a catalyst system comprising rhodium or iridium and a multidentate organic phosphite ligand according to the general formula:

Process for the continuous preparation of alkyl 5-formylvalerate compounds using homogeneous rhodium hydroformylation catalysts

Process for the preparation of an aldehyde through hydroformylation of an unsaturated organic compound in the presence of a catalyst system comprising rhodium of iridium and a multidentate organic phosphite ligand, wherein a monodentate phosphine is present. The process according to the invention can advantageously be carried out for the preparation of methyl-5-formylvalerate, which is an intermediate product in the preparation of a caprolactam or adipic acid, which are in turn raw materials for the preparation of nylon-6 and nylon-6,6, respectively.

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Geleen, Netherlands

Peter C Borman