Process for the hydroformylation of olefins using a cobalt pre-catalyst

1. Process comprising the process steps of:

a) adding an olefin;

b) adding a cobalt pre-catalyst,

wherein the cobalt pre-catalyst is [Co(acac)(C 4 H 8 O 2 ) 4 ] + [BF 4 ] − ;

c) feeding in synthesis gas;

d) heating the reaction mixture from a) to c), with conversion of the olefin to an aldehyde.

2. Process according to claim 1 , wherein the olefin is selected from:

ethene, propene, 1-butene, cis-2-butene, trans-2-butene, mixture of cis- and trans-2-butene, raffinate 1, raffinate 2, isobutene, 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 1-methylcyclohexene, tetramethylethene, 1-octene, 2-octenes, cyclooctene, di-n-butene, diisobutene, undecenes, dodecenes, triisobutene, tri-n-butene.

3. Process according to claim 1 , wherein the olefin is selected from:

1-butene, cis-2-butene, trans-2-butene, isobutene, 1-pentene, 2-pentene, 1-octene, 2-octenes, di-n-butene, diisobutene, triisobutene, tri-n-butene.

4. Process according to claim 1 , wherein the Co pre-catalyst is initially charged as a solution.

5. Process according to claim 4 , wherein the olefin is added to the initially charged Co pre-catalyst solution.

6. Process according to claim 1 , wherein synthesis gas is fed in in process step c) at a pressure in the range from 1 to 8 MPa (10 to 80 bar).

7. Process according to claim 1 , wherein synthesis gas is fed in in process step c) at a pressure in the range from 4 to 6 MPa (40 to 60 bar).

8. Process according to claim 1 , wherein the reaction mixture is heated in process step d) to a temperature in the range from 80° C. to 180° C.

9. Process according to claim 1 , wherein the reaction mixture is heated in process step d) to a temperature in the range from 120° C. to 160° C.