METHOD FOR PREPARING ALDEHYDES COMPRISING 3-21 CARBON ATOMS Russian patent published in 2006 - IPC C07C45/50 C07C47/02 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the hydroformylation process of olefins with using rhodium catalyst for preparing aldehydes comprising 3-21 carbon atoms. Reaction products from the hydroformylation reactor are separated for: (a) gaseous and liquid phase; (b) liquid phase is fractionated for a head fraction containing unreacted olefins and aldehydes and a vat fraction containing by-side products and rhodium catalyst, and (c) the vat fraction is cooled to temperature lower than the hydroformylation point into reactor, preferably, to 10-120°C. Then the vat fraction is saturated with carbon monoxide-containing gas under partial pressure of carbon monoxide 0.1-300 bars. The vat fraction containing catalyst and carbon monoxide are recovered completely or partially into the hydroformylation reactor. Invention provides prolonged working life of catalyst due to prevention of its inactivation in stages for isolation of the end product.

EFFECT: improved preparing method.

11 cl, 3 tbl, 3 dwg, 2 ex