FR2437386A1 - Dry, granular di:ammonium phosphate prodn. - from phosphoric acid and ammonia, by reacting in tube reactor and granulator, with added energy needed for drying - Google Patents
Dry, granular di:ammonium phosphate prodn. - from phosphoric acid and ammonia, by reacting in tube reactor and granulator, with added energy needed for dryingInfo
- Publication number
- FR2437386A1 FR2437386A1 FR7920201A FR7920201A FR2437386A1 FR 2437386 A1 FR2437386 A1 FR 2437386A1 FR 7920201 A FR7920201 A FR 7920201A FR 7920201 A FR7920201 A FR 7920201A FR 2437386 A1 FR2437386 A1 FR 2437386A1
- Authority
- FR
- France
- Prior art keywords
- drying
- granular
- dry
- prod
- recycled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Prodn. of granular, practically dry (NH4)2HPO4 (I) comprises partial reaction, in a tube reactor, of H3PO4 and NH3 so that the heat of reation causes evaporation of water and formation of a suspension. This is supplied together with NH3 and recycled (I) to a granulator where more water is evapd. and granular prod.formed. This prod. is transported in a flow of air towards an ambient-air cooler, so that during transport it undergoes further drying and cooling as surface moisture evaporates. Pref. the granules are tumbled in a rotating drum in contact with a circulating counterflow of air to ensure additional drying and cooling. Pref. fine granules are recycled and oversize material ground. An appts. for the process is claimed. (I) is used to make fertilisers. A dry (1-2% moisture) prod. is now made without any need for fuel for drying; this represents a saving of 5 Francs per tonne of (I). Fewer stages are required with less material to be recycled, also smaller equipment and reduced emissions of dust and fluoride; and the system needed for purifying off gases operates at a lower temp.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94678578A | 1978-09-28 | 1978-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2437386A1 true FR2437386A1 (en) | 1980-04-25 |
Family
ID=25484988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7920201A Pending FR2437386A1 (en) | 1978-09-28 | 1979-08-07 | Dry, granular di:ammonium phosphate prodn. - from phosphoric acid and ammonia, by reacting in tube reactor and granulator, with added energy needed for drying |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2437386A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0040122A1 (en) * | 1980-05-05 | 1981-11-18 | Société GENERALE DES ENGRAIS S.A. | Process for making solid-particle products, in particular NP/NPK granulated fertilizers containing ammonium phosphates |
| US4744965A (en) * | 1986-08-28 | 1988-05-17 | Conserv, Inc. | Process for producing granular diammonium phosphate |
| WO1999059938A1 (en) * | 1998-05-15 | 1999-11-25 | Kemira Agro Oy | Process for the preparation of compound fertilizers |
-
1979
- 1979-08-07 FR FR7920201A patent/FR2437386A1/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0040122A1 (en) * | 1980-05-05 | 1981-11-18 | Société GENERALE DES ENGRAIS S.A. | Process for making solid-particle products, in particular NP/NPK granulated fertilizers containing ammonium phosphates |
| US4744965A (en) * | 1986-08-28 | 1988-05-17 | Conserv, Inc. | Process for producing granular diammonium phosphate |
| WO1999059938A1 (en) * | 1998-05-15 | 1999-11-25 | Kemira Agro Oy | Process for the preparation of compound fertilizers |
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