Patent US3734708A successfully refreshed from Google Patents.
US3734708A
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Method for making ammonium phosphate fertilizer
Assignee: Amex Phosphates Inc
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Filing: 1971-02-24
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Granted: 1973-05-22
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Expires: 1991-02-24
Abstract
Abstract Methods and apparatus for reacting ammonia and phosphoric acid in a high temperature vaporous reaction. The apparatus includes a tee mixer wherein hot ammonia is used to heat and atomize phosphoric acid, and a loop reactor wherein the mixed reactants are retained for from 0.10 to 0.18 seconds after which the reaction product is immediately quenched. The apparatus also includes materials handling devices for controlling reactant flows and reaction conditions whereby high analysis polyphosphate fertilizers are produced in dry or liquid form.
Inventors
- 👤 T Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:30
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A method according to claim 1 wherein said mixing zone is provided in a mixing tee, the ammonia being introduced through a first arm of the tee, the phosphoric acid being introduced through a second arm disposed at 180* with respect to the first arm and the mixture being withdrawn through a third arm disposed at 90* with respect to said first and second arms.
Claim 2
Dependent Claim
31 words
A method according to claim 1 wherein the residence time of the mixed reactants in said mixing tee is not more than about 0.04 seconds before introduction into said reaction zone.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein the ammonia is introduced into the mixing zone at approximately sonic velocity.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein the acid is introduced into said reaction zone at a temperature of about 200* to 220*F.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein the ammonia is introduced into said mixing zone at a temperature of 600* to 700*F.
Claim 6
Dependent Claim
34 words
A method according to claim 1 wherein the hot melt is quenched by introducing the hot melt withdrawn from said reaction zone substantially immediately into an aqueous solution to form a liquid fertilizer solution.
Claim 7
Dependent Claim
14 words
A method according to claim 7 wherein said liquid fertilizer solution is about 11-37-0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |