B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/128, 260/639
B01J 27/16 (2006.01) B01J 37/00 (2006.01) C07C 29/08 (2006.01)
Patent
CA 1100477
ABSTRACT A catalyst comprising phosphoric acid supported on porous silica gel particles having both R high water resistance and a high bulk crushing strength and a pore volume of at least 0.6 ml/g, said particles having been obtained by the following successive steps: (a) preparing a silica hydrosol by mixing an aqueous solution of an alkali metal silicate with an aqueous solution of an acid, (b) converting the hydrosol into droplet form, and (c) allowing the droplets to gel in a liquid which is immiscible with water, whereupon the hydrogel particles emerging from said liquid have been separated off and freed from water and alkali metal compounds by the following sequence of consecutive steps: (I) removing by evaporation at least 25% of the amount of water present in the hydrogel particles, (II) decreasing the alkali metal content of the hydrogel particles in an aqueous medium to less than 1%w, calculated on dry material, and (III) drying and calcining the silica particles. These catalysts exhibit improved water resistance and a higher hulk crushing strength than the known phosphonic acid/porous silica gel catalysts used for olefin hydration to produce alkanols.
276092
de Goederen Cornelis W.j.
Spek Theo G.
Shell Canada Limited
Smart & Biggar
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