US3003852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of orthophosphoric acid
Assignee: Kemishka Patenter AB
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Filing: 1958-10-15
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Granted: 1961-10-10
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Expires: 1978-10-15
Abstract
No abstract record available.
Inventors
- 👤 Nordengren Rolf Gunnar Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF PRODUCING A PHOSPHORIC ACID CONTAINING 40 TO 45% OF P2O5 WHICH COMPRISES MIXING AND REACTING PHOSPHATE ROCK WITH PHOSPHORIC ACID IN SUCH RELATIVE AMOUNTS THAT A GEL OF MONOCALCIUM PHOSPHATE IS FORMED, CHARGING SAID GEL OF MONOCALCIUM PHOSPHATE INTO A MIXTURE PRE-HEATED TO A TEMPERATURE OF AT LEAST 130*C. AND CONSISTING OF PHOSPHORIC ACID, SULFURIC ACID AND WATER DURING A TIME PERIOD OF AT LEAST 30 MINUTES TO FORM A REACTION MIXTURE CONSISTING ESSENTIALLY OF PHOSPHORIC ACID, CALCIUM SULFATE IN THE FORM OF ANHYDRITE CRYSTALS, NONREACTED CALCIUM MONOPHOSPHATE, SULFURIC ACID AND WATER, ALLOWING THE TEMPERATURE OF SAID REACTION MIXTURE TO DECREASE TO A VALUE NOT LOWER THAN ABOUT 110*C. DURING SAID CHARGING, THE COMBINED AMOUNT OF PHOSPHORIC ACID MIXED WITH SAID PHOSPHATE ROCK AND PHOSPHORIC ACID IN SAID PRE-HEATED MIXTURE, CONSISTING OF PHOSPHORIC ACID, SULFURIC ACID AND WATER, CALCULATED AS P2O5, BEING AT LEAST TWICE AS LARGE AS THE AMOUNT REQUIRED TO REACT COMPLETELY WITH RAW PHOSPHATE AND SULFURIC ACID TO FORM PHOSPHORIC ACID, WATER AND CALCIUM SULFATE, DISCHARGING SAID PARTIALLY
Claim 2
Independent Claim
174 words
A METHOD OF PRODUCING A PHOSPHORIC ACID CONTAINING 40 TO 45% OF P2O5 WHICH COMPRISES MIXING AND REACTING PHOSPHATE ROCK WITH PHOSPHORIC ACID IN SUCH RELATIVE AMOUNTS THAT A GEL OF MONOCALCIUM PHOSPHATE IS FORMED, CHARGING SAID GEL OF MONOCALCIUM PHOSPHATE INTO A MIXTURE PRE-HEATED TO A TEMPERATURE OF AT LEAST 130*C. AND CONSISTING OF PHOSPHORIC ACID, SULFURIC ACID AND WATER DURING A TIME PERIOD OF AT LEAST 30 MINUTES TO FORM A REACTION MIXTURE CONSISTING ESSENTIALLY OF PHOSPHORIC ACID, CALCIUM SULFATE IN THE FORM OF ANHYDRITE CRYSTALS, NONREACTED CALCIUM MONOPHOSPHATE, SULFURIC ACID AND WATER, ALLOWING THE TEMPERATURE OF SAID REACTION MIXTURE TO DECREASE TO A VALUE NOT LOWER THAN ABOUT 110*C. DURING SAID CHARGING, THE COMBINED AMOUNT OF PHOSPHORIC ACID MIXED WITH SAID PHOSPHATE ROCK AND PHOSPHORIC ACID IN SAID PRE-HEATED MIXTURE, CONSISTING OF PHOSPHORIC ACID, SULFURIC ACID AND WATER, CALCULATED AS P2O5, BEING AT LEAST TWICE AS LARGE AS THE AMOUNT REQUIRED TO REACT COMPLETELY WITH RAW PHOSPHATE AND SULFURIC ACID TO FORM PHOSPHORIC ACID, WATER AND CALCIUM SULFATE, DISCHARGING SAID PARTIALLY
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |