METHODS AND CATALYSTS FOR SELECTIVE HYDROGENATION Russian patent published in 2023 - IPC C07C5/09 B01J23/44 C07C11/04 C07C7/167 

FIELD: hydrogenation of acetylene.

SUBSTANCE: present disclosure relates to processes for the selective hydrogenation of acetylene, methods for starting a selective hydrogenation reactor, and hydrogenation catalysts suitable for use in such processes. Disclosed is a method for the selective hydrogenation of acetylene, which includes contacting a catalyst composition containing a porous support, palladium, and at least one ionic liquid with a process gas. When this process gas contains ethylene present in the process gas in an amount of at least 10% mol.; acetylene present in the process gas in an amount of at least 1 ppm; and hydrogen present in the process gas in an amount of at least 5 mol%. The process gas is contacted with the catalyst at a gas hourly space velocity (GOSV), based on the total volume of catalyst in one bed or multiple beds, ranging from 7500 h^{- 1} to 40000 h^{- 1}. Also present in the process gas is carbon monoxide in an amount of from 0 ppm to 0 ppm up to 190 ppm during the implementation of the method is hydrogenated at least 90% of the acetylene present in the process gas, and not more than 1% mol. of the total amount of acetylene and ethylene present in the process gas is converted to ethane. In addition, used in the way the composition of the catalyst contains a porous carrier in an amount of 90 wt.% up to 99.9 wt%; palladium, in an amount of at least 0.02 wt.% in terms of the mass of the element; and one or more ionic liquids, in a combined amount up to 10 wt%. Also, the hydrogenation catalyst has a BET surface area of not more than 10 m²/g and a pore volume of at least 0.05 ml/g.

EFFECT: creation of a method for the selective hydrogenation of acetylene at high productivity and/ or at a low concentration of CO, but without the risk of uncontrolled thermal conditions.

14 cl, 9 dwg, 1 tbl, 7 ex