GB495192A - Process for the manufacture of polyphosphates - Google Patents
Process for the manufacture of polyphosphatesInfo
- Publication number
- GB495192A GB495192A GB9999/37A GB999937A GB495192A GB 495192 A GB495192 A GB 495192A GB 9999/37 A GB9999/37 A GB 9999/37A GB 999937 A GB999937 A GB 999937A GB 495192 A GB495192 A GB 495192A
- Authority
- GB
- United Kingdom
- Prior art keywords
- melt
- production
- temperature
- tempered
- ratio
- 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
- C01B25/418—After-treatment
Abstract
In the production of alkali polyphosphates or mixtures thereof from melts of alkali orthophosphates in which the ratio Alk2O : P2O5 lies between 1 : 1 and 2 : 1, the melts or the solid products obtained therefrom are tempered, i.e. maintained for several hours at a constant or slightly falling temperature, within the range 650 to 200 DEG C., followed by rapid or slow cooling. Products which have solidified may be heated up to the softening temperature and tempered at this temperature. In the production of tripolyphosphate from a melt having a Na2O : P2O5 ratio of 5 : 3, tempering is effected at a temperature between 500 and 200 DEG C., followed by slow cooling, whilst in the production of tetrapolyphosphate from a melt having a Na2O : P2O5 ratio of 3 : 2 tempering is effected at temperatures between 550 and 650 DEG C., until the melt solidifies, and the melt is then suddenly cooled; in the latter case slow cooling of the tempered melt gives a mixture of tripolyphosphate and trimeta phosphate. The Specification as open to inspection under Sect. 91 comprises also the following subject-matter: the production of crystals from the polyphosphates obtained by dissolving them in water and salting them out with a sodium compound such as sodium hydroxide or sodium chloride, or by introducing them into solutions of such sodium compounds. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE495192X | 1936-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB495192A true GB495192A (en) | 1938-11-08 |
Family
ID=6544851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9999/37A Expired GB495192A (en) | 1936-04-11 | 1937-04-08 | Process for the manufacture of polyphosphates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB495192A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2747964A (en) * | 1952-04-02 | 1956-05-29 | Fisons Ltd | Manufacture of polymeric phosphates |
| US2811419A (en) * | 1953-03-21 | 1957-10-29 | Knapsack Ag | Process for producing monomeric phosphates |
| US2898189A (en) * | 1954-03-08 | 1959-08-04 | Knapsack Ag | Process for preparing alkali metal triphosphates, alkali metal pyrophosphates and mixtures thereof |
| US2916354A (en) * | 1956-10-16 | 1959-12-08 | Monsanto Chemicals | Method of producing phosphates |
| US2986449A (en) * | 1955-11-10 | 1961-05-30 | Knapsack Ag | Process for the production of alkali metal polyphosphates |
| US3171733A (en) * | 1961-09-08 | 1965-03-02 | Tennessee Valley Authority | High-analysis ammonium polyphosphate fertilizer |
| CN112875668A (en) * | 2021-03-17 | 2021-06-01 | 云南云天化股份有限公司 | Method for preparing water-soluble ammonium polyphosphate by two-step method |
-
1937
- 1937-04-08 GB GB9999/37A patent/GB495192A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2747964A (en) * | 1952-04-02 | 1956-05-29 | Fisons Ltd | Manufacture of polymeric phosphates |
| US2811419A (en) * | 1953-03-21 | 1957-10-29 | Knapsack Ag | Process for producing monomeric phosphates |
| US2898189A (en) * | 1954-03-08 | 1959-08-04 | Knapsack Ag | Process for preparing alkali metal triphosphates, alkali metal pyrophosphates and mixtures thereof |
| US2986449A (en) * | 1955-11-10 | 1961-05-30 | Knapsack Ag | Process for the production of alkali metal polyphosphates |
| US2916354A (en) * | 1956-10-16 | 1959-12-08 | Monsanto Chemicals | Method of producing phosphates |
| US3171733A (en) * | 1961-09-08 | 1965-03-02 | Tennessee Valley Authority | High-analysis ammonium polyphosphate fertilizer |
| CN112875668A (en) * | 2021-03-17 | 2021-06-01 | 云南云天化股份有限公司 | Method for preparing water-soluble ammonium polyphosphate by two-step method |
| CN112875668B (en) * | 2021-03-17 | 2022-12-02 | 云南云天化股份有限公司 | Method for preparing water-soluble ammonium polyphosphate by two-step method |
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