High porosity calcium silicate mass for storing acetylene gas
AssigneeWorthington Acetylene Cylinder, Inc.
InventorMichael S. Rabren
Life of this patent
Estimating the term…
Abstract
A hardened asbestos-free, porous, calcium silicate filler material for an acetylene storage vessel is made by mixing quicklime with water to form a first mixture and at the same time mixing water, synthetic silica, cellulose fibers and ground quartz silica to form a second mixture. The first mixture is then added to the second mixture to form a third mixture. The third mixture is homogenized. Then a suspending agent is dispersed in the third mixture to form a fourth mixture. The fourth mixture is transferred into a cylinder to be filled and is cured under saturation steam pressure. Thereafter, the cylinder is dried. A gas storage cylinder so formed has a monolithic dry mass filling a metal shell. The mass has a porosity of about 88 to 91% and a density in the range of 250 g/l to 270 g/l.
Claims19
A process for producing a gas storage cylinder, said process comprising the steps of:
- mixing about 8% to 15% by wet weight quicklime with ambient temperature water to form a first mixture;
- mixing a slurry containing the following ingredients:
- ambient temperature water, about 0.002% to 0.010% by wet weight synthetic silica, about 1.5% to 5% by wet weight cellulose fibers and about 8% to 14% by wet weight ground quartz silica to form a second mixture;
- adding the first mixture to the second mixture to form a third mixture;
- homogenizing the third mixture by stirring;
- dispersing a suspending agent in said third mixture to form a fourth mixture, said suspending agent comprising about 0.002% to 0.010% by wet weight ethyl hydroxyethyl cellulose;
- transferring said fourth mixture into a cylinder to be filled;
- curing said fourth mixture under saturation steam pressure of about 145 psig for about 25 hours;
- and,
- drying said cylinder for about five days at a temperature of about 325.degree. F. to fill said cylinder with a porous calcium silicate mass consisting essentially of cellulose at about 1.5% to 5% total wet weight as a fibrous reenforcing agent;
- water;
- ground quartz silica at about 8% to 14% total wet weight;
- quicklime at about 8% to 15% total wet weight;
- synthetic silica at about 0.002% to 0.01% total wet weight:
- and, ethyl hydroxyethyl cellulose at about 0.002% to 0.010% total wet weight as an organic suspending agent, the water being present in an amount of about 2.5 times greater than the amount of solids.
A gas storage cylinder for storing gases therein, comprising:
- a metal shell;
- and,
- a monolithic dry mass filling said shell, said mass having a porosity of about 88% to 91% and a density range of about 250 g/l to 270 g/l and constituting a dried product of an aqueous paste consisting essentially of:
- cellulose at about 1.5% to 5% total wet weight as a fibrous reenforcing agent,
- water,
- synthetic silica at about 0.002% to 0.01% total wet weight,
- quicklime at about 8% to 15% total wet weight,
- ground quartz silica at about 8% to 14% total wet weight, and
- ethyl hydroxyethyl cellulose at about 0.002% to 0.010% total wet weight as an organic suspending agent, the water being present in an amount of about 2.5 times greater than the amount of solids.
A filler mass for storing a gas therein, comprising:
- a monolithic dry mass, said mass having a porosity of about 88% to 91% and a density range of about 250 g/l to 270 g/l and constituting a dried product of an aqueous paste consisting essentially of:
- cellulose at about 1.5% to 5% total wet weight as a fibrous reenforcing agent,
- water,
- ground quartz silica at about 8% to 14% total wet weight,
- quicklime at about 8% to 15% total wet weight,
- synthetic silica at about 0.002% to 0.01% total wet weight, and
- the water being present in an amount of about 2.5 times greater than the amount of solids.
A process for producing a gas storage cylinder, said process comprising the steps of:
- providing a cylinder to be filled;
- and,
- filling said cylinder with a porous calcium silicate mass consisting essentially of cellulose at about 1.5% to 5% total wet weight as a fibrous reenforcing agent;
- water;
- ground quartz silica at about 8% to 14% total wet weight;
- quicklime at about 8% to 15% total wet weight;
- synthetic silica at about 0.002% to 0.01% total wet weight;
- and, the water being present in an amount of about 2.5 times greater than the amount of solids.
Dependencies are inferred from the claim text.