Patent US2675416A successfully refreshed from Google Patents.
Patent US3072461A successfully refreshed from Google Patents.
US3072461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phosphoric acid
Assignee: Dow Chemical Co
•
Filing: 1960-07-29
•
Granted: 1963-01-08
•
Expires: 1980-07-29
Abstract
No abstract record available.
Inventors
- 👤 Ray S Long
- 👤 David A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:48
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID WHICH COMPRISES; ACIDULATING A PHOSPHATE CONTAINING ORE WITH AQUEOUS HYDROCHLORIC ACID SOLUTION SAID ACID BEING FROM ABOUR 5 TO 7 MOLAR IN CONCENTRATION AND THE HYDROGEN ION TO PHOSPHATE RATIO OF SAID ACID AND SAID ORE BEING FROM STOICHIOMETRIC (3 TO 1) TO ABOUT 3.3 TO 1 ON A MOLAR BASIS, CONTACTING THE REACTION MIXTURE OF THE ACIDULATION WITH A SUBSTANTIALLY WATER-IMMISCIBLE TRIALKYL PHOSPHATE ORGANIC EXTRACTANT THEREBY EXTRACTING SAID PHOSPHORIC ACID FROM SAID REACTION MIXTURE, THE NUMBER OF CARBON ATOMS OF EACH ALKYL SUBSTITUENT OF SAID TRIALKYL PHOSPHATE BEING FROM 2 TO UP TO 8, SEPARATING THE PHOSPHORIC ACID LADEN ORGANIC EXTRACT FROM THE SUBSTANTIALLY PHOSPHORIC ACID DEPLETED REACTION MIXTURE, SCRUBBING SAID PHOSPHORIC ACID LADEN EXTRACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION SAID AQUEOUS PHOSPHORIC ACID SOLUTION BEING OF A CONCENTRATION OF FROM ABOUT 15 TO ABOUT 30 PERCENT IN PHOSPHORIC ACID CONTENT AND THE PHASE RATIO OF SAID AQUEOUS PHOSPHORIC ACID TO SAID ORGANIC EXTRACT BEING FROM ABOUT 0.1 TO 1 TO ABOUT 0.5 TO 1, CONTACTING SAID SCRUBBED PHOSPHORIC ACID LADEN ORGAIC EXTRACT WITH WATER, AND SEPARATING THE AQUEOUS PHOSPHORIC ACID SOLUTION SO PRODUCED FROM SAID PHOSPHORIC ACID DEPLETED ORGANIC EXTRACTANT.
Claim 2
Dependent Claim
201 words
A PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID WHICH COMPRISES; ACIDULATING A PHOSPHATE CONTAINING ORE WITH AQUEOUS HYDROCHLORIC ACID SOLUTION SAID ACID BEING FROM ABOUR 5 TO 7 MOLAR IN CONCENTRATION AND THE HYDROGEN ION TO PHOSPHATE RATIO OF SAID ACID AND SAID ORE BEING FROM STOICHIOMETRIC (3 TO 1) TO ABOUT 3.3 TO 1 ON A MOLAR BASIS, CONTACTING THE REACTION MIXTURE OF THE ACIDULATION WITH A SUBSTANTIALLY WATER-IMMISCIBLE TRIALKYL PHOSPHATE ORGANIC EXTRACTANT THEREBY EXTRACTING SAID PHOSPHORIC ACID FROM SAID REACTION MIXTURE, THE NUMBER OF CARBON ATOMS OF EACH ALKYL SUBSTITUENT OF SAID TRIALKYL PHOSPHATE BEING FROM 2 TO UP TO 8, SEPARATING THE PHOSPHORIC ACID LADEN ORGANIC EXTRACT FROM THE SUBSTANTIALLY PHOSPHORIC ACID DEPLETED REACTION MIXTURE, SCRUBBING SAID PHOSPHORIC ACID LADEN EXTRACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION SAID AQUEOUS PHOSPHORIC ACID SOLUTION BEING OF A CONCENTRATION OF FROM ABOUT 15 TO ABOUT 30 PERCENT IN PHOSPHORIC ACID CONTENT AND THE PHASE RATIO OF SAID AQUEOUS PHOSPHORIC ACID TO SAID ORGANIC EXTRACT BEING FROM ABOUT 0.1 TO 1 TO ABOUT 0.5 TO 1, CONTACTING SAID SCRUBBED PHOSPHORIC ACID LADEN ORGAIC EXTRACT WITH WATER, AND SEPARATING THE AQUEOUS PHOSPHORIC ACID SOLUTION SO PRODUCED FROM SAID PHOSPHORIC ACID DEPLETED ORGANIC EXTRACTANT.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |