TWO-STEP PROCESS OF OBTAINING THE PROPIONIC ALDEHYDE Russian patent published in 2017 - IPC C07C45/50 C07C47/02 C01B3/02 B82B3/00 

FIELD: chemistry.

SUBSTANCE: method includes the step of hydroformylating ethylene with carbon monoxide at elevated temperature and pressure in the presence of a metal rhodium catalyst on a carrier. Prior to the hydroformylation step, a hydrogenation stage of carbon dioxide in the synthesis gas is preliminarily carried out in the presence of a catalyst containing metallic cobalt on a carrier in the form of an organometallic MIL-53 (Al) frame structure obtained in the course of microwave activated synthesis, and the process for producing propionaldehyde is carried out in flow two-way reactor at a pressure of 20-40 atm by contacting a stationary catalyst bed located on the upper shelf of the reactor and heated to a temperature of 500°C, with feed mixture H₂ and CO₂ at a gas feed rate of 500-1000 h^-1 followed by mixing of the formed and heated to a temperature of 500-520°C of reaction gases containing a mixture of CO-H₂-CO_2, with cold ethylene, fed into the inter-bed space, and the resulting gas mixture at a ratio of CO:H₂:C₂H₄=1:(1÷2):1 is fed to the lower shelf of the reactor and contacted at a temperature of 170-230°C with a hydroformylation catalyst present therein, presented by rhodium in the form of the organometallic framework structure MIL-53 (Al), obtained during autogenous hydrothermal synthesis.

EFFECT: method allows to increase the selectivity of the formation of the target product, and the yield, ensuring the utilisation of greenhouse gas.

3 cl, 2 dwg, 1 tbl, 8 ex