Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Chemistry
Class Information
Number: 423/320
Name: Chemistry of inorganic compounds > Phosphorus or compound thereof > Oxygen containing > Ternary compound containing hydrogen > Orthophosphoric acid > Reacting an acid and phosphate rock > Sulfuric acid
Description: Processes in which the acid includes sulfuric acid (H2










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
7736526 Method of filtering phosphate utilizing a rotary table filter or horizontal table filter Jun. 15, 2010
7678354 Integrated lime kiln process Mar. 16, 2010
7172742 Method of preparing wet process phosphoric acid Feb. 6, 2007
6544489 Defoaming compositions for high acid strength media Apr. 8, 2003
6365117 Method for preparing phosphoric acid Apr. 2, 2002
6251351 Wet-process technique for refining phosphoric acid Jun. 26, 2001
6235257 Process waters in phosphate manufacturing May. 22, 2001
5679315 Method of production of high purity silica Oct. 21, 1997
5395603 Automatic control system for a chemical process, especially a wet process phosphoric acid plant Mar. 7, 1995
5366640 Conversion of phosphoric acid waters Nov. 22, 1994
5318707 Method of clarifying phosphoric acid Jun. 7, 1994
5316748 Phosphoric acid manufacturing with converted waters May. 31, 1994
5236679 Removal of aluminum contamination during production of phosphoric acid Aug. 17, 1993
5211928 Method of improving gypsum slurry filtration in the production of phosphoric acid May. 18, 1993
5211735 Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock May. 18, 1993
5188812 Automatic control system for a phosacid attack tank and filter Feb. 23, 1993
5185135 Method of dewatering a wet process phosphoric acid slurry Feb. 9, 1993
5173280 Method of clarifying phosphoric acid using high charge sulfonic-type polymers Dec. 22, 1992
5120519 Scale control in phosphoric acid manufacture Jun. 9, 1992
5084261 Recovery and utilization of gypstack leachate in hemihydrate phosphoric acid process Jan. 28, 1992
5009873 Crystal modification in wet process phosphoric acid production Apr. 23, 1991
5002744 Method for defluorinating wet process phosphoric acid Mar. 26, 1991
4994248 P.sub.2 O.sub.5 recovery and phosphoric acid purification Feb. 19, 1991
4853201 Recovery of P.sub.2 O.sub.5 values from phosphoric acid hemihydrate crystals Aug. 1, 1989
4834787 Phosphate rock utilization May. 30, 1989
4828811 Method for producing phosphoric acid from phosphate ore May. 9, 1989
4822582 Process for the removal of heavy metals from acid, phosphate-containing, aqueous media Apr. 18, 1989
4800071 Filtration aids for removal of calcium solids from aqueous phosphoric acid Jan. 24, 1989
4797265 Process for the production of highly concentrated phosphoric acid Jan. 10, 1989
4780294 Process for making crude phosphoric acid Oct. 25, 1988
4777027 Continuous process for preparing phosphoric acid and calcium sulphate Oct. 11, 1988
4762698 Method for increasing fluosilicic acid recovered from wet process phosphoric acid production Aug. 9, 1988
4743438 Process for producing phosphoric acid from low purity phosphate rock May. 10, 1988
4734272 Phospho-gypsum recovery process Mar. 29, 1988
4714600 Process for production of phosphoric acid from dry matrix by SO.sub.3 treatment and extraction Dec. 22, 1987
4684512 Phosphate recovery from wet phosphoric acid purification process Aug. 4, 1987
4683127 Process for making wet-process phosphoric acid Jul. 28, 1987
4643882 Process for recovery by a solvent of the uranium present in phosphoric acid Feb. 17, 1987
4637922 Method for removing organic materials from a wet process phosphoric acid Jan. 20, 1987
4636372 Aluminum fluorophosphates made from impure phosphoric acids and conversion thereof to alkalimetal phosphates Jan. 13, 1987
4632814 Process for stabilizing phosphoric acid Dec. 30, 1986
4623528 Recovery of fluorine from waste gases Nov. 18, 1986
4608238 Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid Aug. 26, 1986
4606897 Method to improve acidulation quality of Idaho phosphate rock Aug. 19, 1986
4592901 Method of removing suspended solids from phosphoric acid Jun. 3, 1986
4588570 Method for the preparation of phosphoric acid and calcium sulphate May. 13, 1986
4581156 Control of foam formation in the manufacture of wet process phosphoric acid Apr. 8, 1986
4577804 Wet grinding phosphate rock in an acidic slurry Mar. 25, 1986
4559204 Treatment of phosphate ore used in preparing phosphate matrix slurries Dec. 17, 1985
4557915 Production of phosphoric acid Dec. 10, 1985

1 2 3 4










 
 
  Recently Added Patents
Malicious attack detection and analysis
Satellite communication network
Evolutionary clustering algorithm
Leg stretching device
Emergency whistle, flashlight, and compass
Agglutination judgment method
High voltage circuit for electrical stimulation
  Randomly Featured Patents
Apparatus for measuring ozone concentration
Alteration of plant embryo/endosperm size during development
Drag reducing aerostabilizer for pickup trucks
Switchgear and switchgear operating mechanism
Ambient light detector, laser lighting control device using the same suitable for bar code reader, and bar code reader
Water stop structure for wire harness
Low power DVD playback in a portable computing system
Four wheel drive vehicle with slip control system
Wavelength-division multiplexing optical transmission system
Liquid crystal cell window