Dry water
First Claim
1. 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.
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Abstract
A submicroscopic particulate silica having a particle size range from about5-20 mμ that is prepared in a hot gaseous environment at about 1100° 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° 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.
47 Citations
2 Claims
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1. 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. - View Dependent Claims (2)
- , said submicroscopic particulate silica prepared in a hot gaseous environment at about 1100°
Specification
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- Resources
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Current AssigneeThe United States Of America As Represented By The Secretary Of The Army
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Original AssigneeThe United States Of America As Represented By The Secretary Of The Army
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InventorsAllan, Barry D.
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Primary Examiner(s)Lovering, Richard D.
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Application NumberUS05/636,328Time in Patent Office445 DaysField of Search252/194, 252/449, 423/336US Class Current252/194CPC Class CodesC04B 40/0633 Chemical separation of ingr...C09K 5/066 Cooling mixtures; De-icing ...
