A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.

A process for preparing aldehydes by a homogeneously catalyzed hydroformylation of C.sub.4 to C.sub.20 olefins involves withdrawing a biphasic stream (liquid/gaseous) and expanding in two stages. Before, between, or after the two stages, the liquid phase is cooled. Only after expansion and cooling is the homogeneously dissolved rhodium catalyst system separated from the residual stream in a three-stage removal.

A process for producing branched alcohols through isomerization, hydroformylation and hydrogenation.

A process for producing branched alcohols through isomerization, hydroformylation and hydrogenation.

Diphosphites having an open, 3-methylated outer unit and use thereof in hydroformylation.

Diphosphites having an open, 3-methylated outer unit and use thereof in hydroformylation.

A process for producing branched alcohols through isomerization, hydroformylation and hydrogenation.

A process for producing branched alcohols through isomerization, hydroformylation and hydrogenation.

Disclosed is a method for the producingtiona target compoundby oxidative coupling of methane. A starting gas mixture is provided which contains an olefin, carbon monoxide, carbon dioxide and optionally hydrogen, wherein the olefin is subjected to hydroformylation with the carbon monoxide and the hydrogen of the starting mixture to obtain an aldehyde, wherein the paraffin and the olefin have a carbon chain with a first carbon number and the aldehyde has a carbon chain with a second carbon number which is greater by one than the first carbon number. The carbon dioxide present in the starting mixture is removed upstream and/or downstream of the hydroformylation. The carbon dioxide is subjected to dry reforming with methane to obtain carbon monoxide, and that the carbon monoxide subjected to hydroformylation comprises at least part of the carbon monoxide obtained in the dry reforming .

Disclosed is a method for the producingtiona target compoundby oxidative coupling of methane. A starting gas mixture is provided which contains an olefin, carbon monoxide, carbon dioxide and optionally hydrogen, wherein the olefin is subjected to hydroformylation with the carbon monoxide and the hydrogen of the starting mixture to obtain an aldehyde, wherein the paraffin and the olefin have a carbon chain with a first carbon number and the aldehyde has a carbon chain with a second carbon number which is greater by one than the first carbon number. The carbon dioxide present in the starting mixture is removed upstream and/or downstream of the hydroformylation. The carbon dioxide is subjected to dry reforming with methane to obtain carbon monoxide, and that the carbon monoxide subjected to hydroformylation comprises at least part of the carbon monoxide obtained in the dry reforming .