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Class Information
Number: 71/40
Name: Chemistry: fertilizers > Processes and products > Inorganic material > Phosphorus-containing > Phosphates > Acid treatment > Sulfuric acid
Description: Processes wherein the acid used in H2SO4.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7534281 |
Organic recycling with a pipe-cross or tubular reactor |
May. 19, 2009 |
| 7452398 |
Phosphate and potash(PK)-containing compound fertilizer |
Nov. 18, 2008 |
| 6346131 |
Fertilizer compositions for administering phosphates to plants |
Feb. 12, 2002 |
| 6231767 |
Treatment of phosphatic wastes |
May. 15, 2001 |
| 5308372 |
Vegetable oil processing to obtain nutrient by-products |
May. 3, 1994 |
| 5275639 |
Recovery of phosphates from elemental phosphorus bearing wastes |
Jan. 4, 1994 |
| 5211735 |
Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock |
May. 18, 1993 |
| 4939165 |
Photoactive bithienyl pesticides |
Jul. 3, 1990 |
| 4836843 |
Fertilizer process |
Jun. 6, 1989 |
| 4834787 |
Phosphate rock utilization |
May. 30, 1989 |
| 4710364 |
Continuous recovery of sulfur oxide from flue gas |
Dec. 1, 1987 |
| 4650682 |
Acidifier-ammoniator |
Mar. 17, 1987 |
| 4594090 |
High nutrient content fertilizers |
Jun. 10, 1986 |
| 4568374 |
Process for the preparation of fertilizers by the partial solubilization of phosphate rocks |
Feb. 4, 1986 |
| 4522638 |
Method and apparatus for regulating the NH.sub.3 content in scrubbing liquid used in a gas scrubbing process |
Jun. 11, 1985 |
| 4469504 |
Process for the partial solubilization of phosphate rock and obtaining acid and phosphate fertilizers therefrom |
Sep. 4, 1984 |
| 4462972 |
Method for producing fertilizer-grade phosphoric acid |
Jul. 31, 1984 |
| 4397675 |
Method of producing urea-sulfuric acid reaction products |
Aug. 9, 1983 |
| 4388101 |
Non-pressure nitrogen carrier fertilizer solutions and dispersions and process of manufacture |
Jun. 14, 1983 |
| 4336053 |
Fertilizer solutions stabilized with inorganic acids |
Jun. 22, 1982 |
| T101901 |
Ammonium polyphosphate sulfate fertilizers from wet-process phosphoric acid |
Jun. 1, 1982 |
| 4321077 |
Method of preparation of multicomponent fertilizers |
Mar. 23, 1982 |
| 4308049 |
Process for the absorption of ammonia in acid solutions or slurries |
Dec. 29, 1981 |
| 4252553 |
Process for production of fertilizers |
Feb. 24, 1981 |
| 4231780 |
Treatment of phosphate rock on soil in situ with sulfuric acid |
Nov. 4, 1980 |
| 4177053 |
Method for the production of phosphoric acid with high contents of fertilizer-nutrients |
Dec. 4, 1979 |
| 4175944 |
Removal of fluorine during production of fertilizer |
Nov. 27, 1979 |
| 4168150 |
Process for production of fertilizers |
Sep. 18, 1979 |
| 4077794 |
Method for the manufacture of soil modifiers from waste materials of the manufacture of titanium dioxide |
Mar. 7, 1978 |
| 4073634 |
Process for production of fertilizers |
Feb. 14, 1978 |
| 4073635 |
Process for producing a slurry suitable for the manufacture of a mixed fertilizer containing nitrogen plus phosphorus |
Feb. 14, 1978 |
| RE29458 |
Potassium phosphate manufacture |
Oct. 25, 1977 |
| 4045205 |
Method for the manufacture of soil modifiers from waste material of the manufacture of titanium dioxide |
Aug. 30, 1977 |
| 4028087 |
Fertilizer processes incorporating scrubbed flue gas sludge byproduct |
Jun. 7, 1977 |
| RE29149 |
Production of ammonium phosphates and product thereof |
Mar. 8, 1977 |
| 4007030 |
Process for the simultaneous manufacture of phosphoric acid or the salts thereof and a complex multi-component mineral fertilizer |
Feb. 8, 1977 |
| 3979199 |
Treatment of phosphate rock in soil to provide fertilizer and gypsum |
Sep. 7, 1976 |
| 3962329 |
Manufacture of granular isobutylidenediurea |
Jun. 8, 1976 |
| 3947262 |
Method of producing phosphorus-containing fertilizers |
Mar. 30, 1976 |
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