METHOD OF PREPARING PALLADIUM CATALYST FOR HYDROGENATING ACETYLENE Russian patent published in 2010 - IPC B01J37/02 B01J21/04 B01J23/44 C07C7/163 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of preparing catalysts for purifying ethane-ethylene fractions of pyrolysis gas from acetylene impurities through selective hydrogenation. The invention describes a method of preparing a palladium catalyst on an alumina support for selective hydrogenation of acetylene in an ethane-ethylene fraction, which involves preparation of a support, heating the support and a solution of a palladium organometallic complex, saturation of the support with the solution, removal of solvent from the support and reduction of the metal. The method is distinguished by that, heating and saturation are carried out at 1.0≤T/T_cr≤1.2 and 1.3≤P/P_cr≤5.6 with benzonitrile dissolved in carbon dioxide or with styrene or with a cyclohexane complex of palladium chloride. The solvent is removed from the support through simple release of pressure to P<P_cr and reduction is carried out in a hydrogen current at temperature of about 470 K, where T is temperature, K; P is pressure, MPa; T_cr is critical temperature of the solvent; P_cr is critical pressure of the solvent.

EFFECT: obtaining a highly active, highly selective, finely divided catalyst with long continuous operation periods between regeneration periods, and the method of preparing the said catalyst is characterised by low power consumption owing to a considerably short period for removing the solvent.

4 tbl, 2 dwg, 3 ex