| 摘要 |
Selective hydrogenation process for (4-10)C diolefins with hydrogen gas comprises: (a) at least one palladium-contg. material selected from Pd or Pd-oxide; (b) at least one silver-contg. material selected from Ag and AgO; (c) at least one alkali metal fluoride; and (d) at least one inorganic support material. The inorganic support is pref. alumina, silica, titania, zirconia, aluminosilicate, zinc aluminate and/or zinc titanate. The alkali metal fluoride is pref. potassium fluoride and the support pref. alumina. The catalyst pref. includes 0.05 - 0.6 wt.% Pd, 0.1 - 5 wt.% Ag and 0.2 - 5 wt.% alkali metal. The wt. ratio of Ag:Pd is pref. 2:1 - 10:1. The catalyst pref. comprises particles of size 1-10 nm and surface area 1 - 200 m2/g. The catalyst is pref. made by impregnating a solid material of (a), (b) and (d) with a soln. comprising at least one alkali metal fluoride, drying the impregnated solid material and calcining it at 300 - 600[deg]C. The diolefins and monoolefins are pref. (4-6)C. At least one diolefin is pref. 1.3-butadiene. The feed pref. contains butenes and 0.01-10 wt. % 1,3-butadiene. The feed pref. additionally includes at least one impurity selected from H2S, mercaptans, organic sulphides and CO. 1 - 2 moles of H2 are pref. used per mole of 1,3-butadiene in the feed. The liq. hourly space velocity of the feed is pref. 3 - 100 litres per litre catalyst compsn. per hour. The reaction temp. is pref. 35 - 100[deg]C and pressure 50 - 1000 psig. |
