Method of preparing silicate composition
AssigneeUop LLC
InventorJean-Pierre Gilson
Life of this patent
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Abstract
A method of preparing a silica-containing composition from a lithium silicate sol is disclosed. The compositions are prepared by heating shaped particles of lithium silicate sol to a temperature of about 70.degree. C. or more in the absence of a gelling agent and thereafter subjecting the particles to a washing step to remove lithium therefrom. By means of the novel method it is possible to prepare silica-containing compositions which are suitable as catalyst and/or adsorbent supports.
Claims35
A method of preparing a silica-containing composition comprising the steps of:
- (a) forming a shaped particle of a lithium silicate sol;
- (b) heating the particle to a temperature of about 70.degree. C. or more in the absence of a gelling agent to form a gel while maintaining the shape thereof;
- and,
- (c) subjecting the shaped particle to a washing step prior to cooling of said gel to a temperature of less than 70.degree. C. to remove lithium therefrom and thereby prevent reversion of said gel to said sol.
A method of preparing a spheroidal silica-containing composition comprising the steps of:
- (a) forming spheroidal particles of lithium silicate sol;
- (b) raising the temperature of the spheroidal particles to at least about 70.degree. C. by dispersing them into hot oil in the absence of a gelling agent to form a gel;
- and,
- (c) subjecting the spheroidal particles to a washing step prior to cooling of said gel to a temperature of less than 70.degree. C. to remove lithium therefrom and thereby prevent reversion of said gel to said sol.
A method or preparing a spheroidal silica-containing composition comprising the steps of:
- (a) preheating lithium silicate sol to a temperature of from about 10.degree. C. to about 50.degree. C.;
- (b) forming spheroidal particles of the preheated lithium silicate sol;
- (c) raising the temperature of the spheroidal particles to a temperature of at least 70.degree. C. by dispersing them into hot oil in the absence of a gelling agent to form a gel;
- (d) subjecting the spheroidal particles to an aging step;
- (e) subjecting the spheroidal particles to a washing step prior to cooling of said gel to a temperature of less than 70.degree. C. to remove lithium therefrom and thereby prevent reversion of said gel to said sol;
- (f) subjecting the washed spheroidal particles to a drying step;
- and,
- (g) calcining the dried spheroidal particles.
Dependencies are inferred from the claim text.