ENERGY-EFFICIENT SYNTHESIS OF ALIPHATIC ALDEHYDES MADE OF ALKANES AND CARBON DIOXIDE

摘要

It is the aim of the invention to provide a method for producing aldehydes, by means of which the production of CO2 can be reduced as compared to the conventional hydroformylation and which utilizes alternative raw material sources, and can dispense with the provision of carbon monoxide. Said aim is achieved by methods comprising the following steps: a) providing at least one alkane; b) photocatalytically dehydrogenating the alkane to obtain a mixture containing at least one olefin and hydrogen; c) adding carbon dioxide and hydrogen to the mixture; d) hydroformylating the olefin to obtain at least one aldehyde. In particular, n-butane is first photocatalytically dehydrogenated, and the resulting 1-butene is reacted with CO2 in a hydroformylation process to obtain valeraldehyde. The exemplary overall process on the basis of n-butane and CO2 is as follows: n-butane -> 1-butene + H2 (photocatalytic dehydrogenation); 1-butene + CO2 + 2 H2 -> valeraldehyde + H2O (hydroformylation with CO2).