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US 4,190,457 AGranted
Preparation of inorganic xerogels
AssigneePhillips Petroleum Company
InventorMax P. McDaniel
Life of this patent
Estimating the term…
Abstract
An inorganic xerogel is produced by contacting an inorganic hydrogel with a contacting system which comprises at least one organosilicon compound and thereafter heating the resulting hydrogel to remove essentially all the liquid components therein.
Claims31
A process for preparing an inorganic xerogel which comprises contacting an inorganic hydrogel with a contacting system which comprises at least one organosilicon compound of the formula
- R.sub.n SiA.sub.4-n
- wherein n is an integer of 2 or 3, wherein each R is a saturated or unsaturated hydrocarbon group and each R can be the same or different and wherein A is selected from the group consisting of hydroxy radicals, halides, and alkoxy radicals in which the alkyl group therein contains from 1 to about 10 carbon atoms;
- and,
- heating the thus contacted inorganic hydrogel at an elevated temperature such that essentially all the liquid components contained therein are removed, wherein the amount of the at least one organosilicon compound employed in the contacting step is an amount sufficient to provide an increase in pore volume of the contacted and heated inorganic hydrogel as compared to the pore volume of the heated inorganic hydrogel not contacted with the organosilicon compound.
1 more element
A process for preparing an inorganic xerogel which comprises contacting an inorganic hydrogel with a contacting system which comprises at least one organosilicon compound of the formula
- R.sub.n SiA.sub.4-n
- wherein n is an integer of 2 or 3, wherein each R is a saturated or unsaturated hydrocarbon group and each R can be the same or different and wherein A is selected from the group consisting of hydroxy radicals, halides, and alkoxy radicals in which the alkyl group therein contains from 1 to about 10 carbon atoms;
- and,
- heating the thus contacted inorganic hydrogel at an elevated temperature such that essentially all the liquid components contained therein are removed, wherein the amount of the at least one organosilicon compound employed in the contacting step is in the range of from about 0.1 to about 20 weight percent of the hydrogel employed.
1 more element
Dependencies are inferred from the claim text.