Abstract A submicroscopic particulate silica having a particle size range from about 15-20 m mu that is prepared in a hot gaseous environment at about 1100 DEG C by the vapor phase hydrolysis of a silicon compound is reacted with liquid water in a ratio in weight percent of about 1 part water to about 9 parts water to 1 part of the particulate silica to yield a powdered product which remains flowable over a wide temperature range - even when cooled to an extremely low temperature of -196 DEG C. The adsorbed water is liberated on heating the powdered product. The powdered product with adsorbed water up to about 90 weight percent has utility as a coolant by liberating water on heating. The powdered product is useful as moisture source for miscellaneous purposes over a wide temperature range.
The powdered reaction product of liquid water and a submicroscopic particulate silica that is at least 99.9 percent silica and that has a particle size range from about 15-20 mμ, said submicroscopic particulate silica prepared in a hot gaseous environment at about 1100° C by the vapor phase hydrolysis of a silicon compound, said powdered reaction product prepared by adding slowly, while stirring, liquid water in ratio in weight percent of about 1 part water to about 9 parts water to 1 part of said submicroscopic particulate silica to yield said powdered reaction product containing from about 50 weight percent up to about 90 weight percent adsorbed water.
Claim 2
Dependent Claim
108 words
The powdered reaction product of liquid water and a submicroscopic particulate silica that is at least 99.9 percent silica and that has a particle size range from about 15-20 mμ, said submicroscopic particulate silica prepared in a hot gaseous environment at about 1100° C by the vapor phase hydrolysis of a silicon compound, said powdered reaction product prepared by adding slowly, while stirring, liquid water in ratio in weight percent of about 1 part water to about 9 parts water to 1 part of said submicroscopic particulate silica to yield said powdered reaction product containing from about 50 weight percent up to about 90 weight percent adsorbed water.
Claim 3
Dependent Claim
68 words
The powdered reaction product of claim 1 wherein said reacting is accomplished by reacting about 3 parts liquid water with 1 part of said submicroscopic particulate silica to yield said powdered reaction product that contains about 75 weight percent adsorbed water, said powdered reaction product being a flowable, powdered product that remains flowable when cooled to -196° C and which liberates said weight percent adsorbed water when heated.