High-porosity silicocalcareous mass for storing of gas, and production process
AssigneeL'Air Liquide
InventorsPhilippe Deck, Georges Delode, Gerard Vagnard, Bartolomeo Colturri
Life of this patent
Estimating the term…
Abstract
A silicocalcareous mass obtained from an aqueous paste with a base of natural silica and quicklime. The mass is at least doubly stabilized by two mineral suspending agents, and reinforced by a fibrous reinforcing agent. The suspending agent comprises cellulose fibers which may be partially chemically delignified, partially mechanically delignified, or delignified by a combination of chemical and mechanical processes, introduced in an amount of from about 3 to about 30% by weight of the solids. The porous silicocalcareous masses are used for lining containers for gas storage, particularly for containers for storing acetylene gas.
Claims7
A process for lining a bottle with a silicocalcareous mass of good strength and uniformity in order to provide a gas storage bottle, said process comprising:
- slaking quickline with hot water at a temperature of about 40.degree.-85.degree. C. to form a first mixture;
- adding additional water to said first mixture and homogenizing the suspension formed by stirring at a slow speed to provide a second mixture;
- dispersing a reinforcing agent in said second mixture to form a third mixture, said reinforcing agent comprising about 3-30% by weight, based on the final dry weight of the lining, of cellulose fibers selected from the group consisting of cellulose fibers which are partially mechanically delignified, partially chemically delignified, and partially chemically delignified and mechanically refined;
- introducing with stirring into the third mixture, a mixture of natural silica and a member selected from the group consisting of about 8-20% by weight of calcium silicate and about 2-5% by weight of amorphous ultrafine synthetic silica having a specific surface area between about 150 and 300 m.sup.2 per gram, said amounts being based on the final dry weight of the lining, so as to form a fourth mixture;
- dispersing into the fourth mixture a second mineral suspending agent selected from the group consisting of about 0.5-5% by weight of glass fibers, and purified clay in an amount of about 0.1-2% by weight, these quantities being based on the final dry weight of the lining, and thereby forming a paste;
- transferring said paste under partial vacuum into a bottle to be lined;
- maintaining said bottle containing said paste in autoclave under saturation steam pressure of about 1 MPa for about twenty hours;
- and
- drying said bottle in furnace for about seven days at a temperature no greater than 170.degree. C.
A gas storage bottle for storing gases therein, said gas storage bottle being filled with a dried homogeneous silicocalcareous mass having a high porosity of 88-90.5% and having a density between 0.240 kg/l and 0.280 kg/l and a compressive strength between 1.5 MPa to 3.5 MPa and constituting
- a dried product of an aqueous paste consisting essentially of and formed by mixing in order
- quicklime slaked with hot water at a temperature of about 40.degree.-85.degree. C.;
- water;
- 3-30% by weight based on solids of reinforcing cellulose fibers selected from the group consisting of cellulose fibers which are partially mechanically delignified, partially chemically delignified, and partially chemically delignified and mechanically refined, a mixtured of natural finely ground silica and a member selected from the group consisting of 8-20% based on solids of calcium silicate and 2-5% based on solids of amorphous ultrafine synthetic silica having a specific surface area between about 150 and 300 m.sup.2 per gram, the total quantity of silica being such as to provide a weight ratio of lime to silica of between 0.7 and 1.1;
- a mineral suspending agent selected from the group consisting of 0.5-5% by weight based on solids of glass fibers and 0.1-2% by weight based on solids of purified clay;
- the water being present in an amount of at least 3 times greater than the amount of solids.
Dependencies are inferred from the claim text.