METHOD FOR CONTINUOUS HYDROFORMYLATION OF OLEFINS C-C Russian patent published in 2016 - IPC C07C45/50 C07C47/02 B01D61/02 

FIELD: chemistry.

SUBSTANCE: invention relates to continuous hydroformylation of olefins C₂-C₈. Proposed method comprises feeding in reactor raw material, synthesis gas and recycled catalyst solution containing rhodium complexes, organophosphorus ligands and heavy by-products, carrying out chemical reaction hydroformylation, isolated from reactor outlet liquid phase, evaporation of liquid phase separation on product aldehydes, followed by purification and fractionation of catalyst solution, from which part of heavy by-products are separated from catalyst by membrane nano filtration and removed, and remaining after this catalyst solution is returned to system. At that, after evaporation separation aldehydes on nano filtration only part of recycled catalyst solution that is preliminarily diluted with solvent, and remaining part of recycled catalyst solution is fed directly into reactor bypassing stage of nano filtration. At that, fed on nano filtration stream is kept in mass amount determined by empirical formula: P·N_t·K_t/S_t ^ISP, where P is efficiency at aldehydes, N_t is normal formation of heavy products per unit mass of produced aldehydes, S_t ^ISP is concentration of heavy products in catalyst solution at output of evaporator, K_t is empirical coefficient selected in range of 2…5, wherein concentration of heavy products in solution equal to S_t ^ISP, is maintained within range of 0.8…0.95 wt, and as solvent for dilution of catalyst solution to be directed for nano filtration, product aldehydes are used added in filtered flow in weight ratio of 1:1…1:5, before dilution aldehydes via catalyst solution inert gas or hydrogen is passed for 3-10 minutes with volume ratio of gas and catalyst solution not less than 10:1, after nano filtration retentate is directed to evaporation stage separation of aldehydes from catalyst solution for regeneration of diluent and retained by return catalyst and diluent of permeate is removed at rectification of main flow of product aldehydes.

EFFECT: proposed method allows to reduce losses of catalytically active largest complex and organophosphorus ligand with removal of heavy by-products of condensation of aldehydes, as well as reducing speed and normal formation above heavy products.

1 cl, 3 dwg, 1 tbl, 18 ex