GB788682A - Manufacture of compositions containing sodium triphosphate - Google Patents
Manufacture of compositions containing sodium triphosphateInfo
- Publication number
- GB788682A GB788682A GB28845/55A GB2884555A GB788682A GB 788682 A GB788682 A GB 788682A GB 28845/55 A GB28845/55 A GB 28845/55A GB 2884555 A GB2884555 A GB 2884555A GB 788682 A GB788682 A GB 788682A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tower
- water vapour
- phosphate
- passed
- spraying
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/40—Polyphosphates
- C01B25/41—Polyphosphates of alkali metals
- C01B25/412—Preparation from alkali metal orthophosphates
- C01B25/414—Apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Fertilizers (AREA)
Abstract
<PICT:0788682/III/1> Sodium triphosphate in the low temperature modification is prepared by dehydrating one or more sodium ortho-phosphates and/or pyrophosphates at a temperature below 450 DEG C. in an atmosphere containing from 20-100 per cent by volume of water vapour. The dehydration of the starting phosphates may be effected by heating powdered mixtures thereof in a humid atmosphere, but is preferably effected by spray drying solutions thereof in a gaseous phase consisting of superheated water vapour with a temperature of 200 DEG to 450 DEG C. The solution may be sprayed through a binary nozzle by means of water vapour or a mixture containing it, under pressure, and in addition superheated water vapour may be injected into the spraying tower preferably so that it strikes the sprayed phosphate solution as it enters. As shown in the drawing a vessel 1 is fed with water, sodium carbonate and ortho-phosphoric acid from pipes 3, 4 and 5 and the solution so formed is pumped by pump 6 to a spraying nozzle 7 in a tower 8. Superheated steam from heater 10 at a temperature of about 420 DEG C. is passed in at 9 around the nozzle 7 and air heated to 450 DEG C. is passed in at 11. The gases leave the spraying tower at 14 at about 300 DEG to 350 DEG C. and the sodium triphosphate product is removed by a conveyer 15. The waste gases pass through a dust remover 18 and a heat exchanger 12 where their heat is transferred to fresh air entering the system for supply to the spraying tower by means of line 11. Examples refer to the dehydration of a finely-powdered mixture containing disodium phosphate and monosodium phosphate in a molar proportion of 2 : 1 at 400 DEG C., the starting phosphate being placed in a heated tube through which is passed air and water vapour; a further example describes the neutralization of ortho-phosphoric acid with sodium carbonate solution to obtain a starting phosphate which is sprayed at 6 atmospheres pressure into a spraying tower through which air at 450 DEG C. is passed. Additional water vapour is blown into the tower so that the waste gas leaving the tower contains 40 per cent by volume of water vapour. The sodium triphosphate formed leaves the tower at 350 DEG C., and contains 98 per cent of the low temperature form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28845/55A GB788682A (en) | 1955-10-10 | 1955-10-10 | Manufacture of compositions containing sodium triphosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28845/55A GB788682A (en) | 1955-10-10 | 1955-10-10 | Manufacture of compositions containing sodium triphosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB788682A true GB788682A (en) | 1958-01-08 |
Family
ID=41066784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28845/55A Expired GB788682A (en) | 1955-10-10 | 1955-10-10 | Manufacture of compositions containing sodium triphosphate |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB788682A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110309A (en) * | 2015-09-08 | 2015-12-02 | 武汉东晟捷能科技有限公司 | Comprehensive utilization system for heat energy of flue gas generated in production of sodium tripolyphosphate |
-
1955
- 1955-10-10 GB GB28845/55A patent/GB788682A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110309A (en) * | 2015-09-08 | 2015-12-02 | 武汉东晟捷能科技有限公司 | Comprehensive utilization system for heat energy of flue gas generated in production of sodium tripolyphosphate |
| CN105110309B (en) * | 2015-09-08 | 2017-05-31 | 武汉东晟捷能科技有限公司 | Smoke heat energy utilization system for producing sodium tripolyphosphate |
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