The process for process for production of high purity amorphous silica from biogenic matter having a content of amorphous silica, particularly rice hulls, is characterized by use of a solution having an oxidizing solute to reduce the long-chain organic compounds of the biogenic matter prior to volatile removal of the organic compounds by heated oxidation. Prior to reduction of the hydrocarbons the biogenic matter may be finely divided, screened, subjected to surfactant wash, rinsed and soaked in water to accelerate and enhance penetration of the oxidizing solution. Following removal of the volatile impurities by heated oxidation the remaining silica may be rinsed with water, acid solution or other solutions to remove even trace impurities. At the end of the process herein disclosed a fine white amorphous silica of extreme purity can be produced.
Process For Recovering Useful Products And Energy From Siliceous Plant Matter
In the process disclosed herein, siliceous plant matter is steeped in water, soaked in an aqueous solution containing a solute which solubilizes inorganic oxides, soaked in an aqueous solution containing an oxidizing solute, rinsed, dried and thermally pyrolyzed to produce amorphous silica with of low carbon content, low water content, low inorganic impurity content and is of high porosity. Practice of the invention yields usable energy, does not produce carbonization of the atmosphere and is of lower nitrogen oxide and sulphur emission than currently used processes. Lignin, hemicellulose and cellulose derived sugars may be recovered from the steep or soak water. By varying steps of the process herein disclosed, the carbon content, inorganic impurities and porosity of the resulting amorphous silica may be selectively controlled.
Process For Recovering Useful Products And Energy From Siliceous Plant Matter
In the process disclosed herein, siliceous plant matter is steeped in water, soaked in an aqueous solution containing a solute which solubilizes inorganic oxides, soaked in an aqueous solution containing an oxidizing solute, rinsed, dried and thermally pyrolyzed to produce amorphous silica with of low carbon content, low water content, low inorganic impurity content and is of high porosity. Practice of the invention yields usable energy, does not produce carbonization of the atmosphere and is of lower nitrogen oxide and sulphur emission than currently used processes. By varying steps of the process herein disclosed, the carbon content, inorganic impurities and porosity of the resulting amorphous silica may be selectively controlled.
Laura J. Jankower - Lafayette LA Larry W. Shipley - Lafayette LA
Assignee:
Advanced Polymer Systems, Inc. - Redwood City CA
International Classification:
A61K 914 C08J 928
US Classification:
424489
Abstract:
Microscopic particles containing a continuous network of pores open to the particle surface are manufactured of a spongy material. The particles are useful as controlled-release delivery systems for active substances intended for a wide range of uses including topical applications. The spongy character of the particles enhances their usefulness in applications where high pressure or high temperature are encountered, and where exceptional smoothness of feel is required.
Michael Froix - Mountain View CA Larry Shipley - Lafayette LA Hien Nguyen - Los Osos CA Sok L. Khor - Palo Alto CA
Assignee:
Advanced Polymer Systems, Inc. - Redwood City CA
International Classification:
A61L 904
US Classification:
424 45
Abstract:
An apparatus for dispensing pressurized material is comprised of a container, a polymeric matrix having a network of macropores located within the container, and a propellant that may be reversibly sorbed with the network of macropores so as to desorb as the partial pressure of the propellant within the container decreases. The network of pores is substantially non-swellable upon sorption and desorption of the propellant during filling and use of the dispensing apparatus. The polymeric matrix may comprise aggregates of macroporous polymeric particles in which the particles define a substantially non-collapsible pore network and the aggregates define interstitial spaces between the particles, and the interstitial spaces are substantially larger than the pore network.
Michael Froix - Mountain View CA Larry Shipley - Lafayette LA Hien Nguyen - Los Oso CA Sok L. Khor - Palo Alto CA
Assignee:
Advanced Polymer Systems, Inc. - Redwood City CA
International Classification:
A61L 904
US Classification:
424486
Abstract:
An apparatus for dispensing pressurized material is comprised of a container, a polymeric matrix having a network of macropores located within the container, and a propellant that may be reversibly sorbed with the network of macropores so as to desorb as the partial pressure of the propellant within the container decreases. The network of pores is substantially non-swellable upon sorption and desorption of the propellant during filling and use of the dispensing apparatus. The polymeric matrix may comprise aggregates of macroporous polymeric particles in which the particles define a substantially non-collapsible pore network and the aggregates define interstitial spaces between the particles, and the interstitial spaces are substantially larger than the pore network.
Method For Controlling The Properties Of Biogenic Silica
- Jonesboro AR, US Larry W. Shipley - Jonesboro AR, US Leo Gingras - Kinder LA, US
International Classification:
C01B 33/12
Abstract:
Porous amorphous silica can be obtained from siliceous plant matter containing non-siliceous inorganic substances. The siliceous plant matter is soaked in an aqueous solution which includes a chelating agent. The chelating agent is present in an amount which helps to extract at least some of the non-siliceous inorganic matter. The aqueous solution is then separated from the siliceous plant matter. Beneficial properties are imparted to the siliceous plant matter by controlling the amount of at least one preselected non-siliceous inorganic substance in the siliceous plant matter. At the end of the process, the siliceous plant matter is heat treated in the presence of oxygen at a temperature to produce the resulting amorphous silica having the beneficial properties.
St. Anthony School Harlingen TX 1966-1968, Austin Elementary School Harlingen TX 1968-1971, St. Mary's School Brownsville TX 1971-1972, Stell Middle School Brownsville TX 1972-1974
Community:
Benny Garza, Rosa Duarte, Elida Sosa, Alice Garza, Raquel Mendez