GB799429A - Manufacture of alkali metal phosphates - Google Patents
Manufacture of alkali metal phosphatesInfo
- Publication number
- GB799429A GB799429A GB6821/55A GB682155A GB799429A GB 799429 A GB799429 A GB 799429A GB 6821/55 A GB6821/55 A GB 6821/55A GB 682155 A GB682155 A GB 682155A GB 799429 A GB799429 A GB 799429A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali metal
- tower
- per cent
- orthophosphoric acid
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
Abstract
Alkali metal triphosphates, pyrophosphates or mixtures thereof are prepared by neutralizing aqueous orthophosphoric acid with an alkali metal carbonate or hydroxide to obtain a molar proportion of P2O5 to alkali metal oxide within the range of 1:2 and 3:5 and spraying the solution into a spraying tower in contact with hot gases, the spraying conditions being adjusted so that the waste gases leave the tower at 200 DEG to 500 DEG C. The moisture content of the waste gases may be between 60 and 400 grams of water per kilogram. According to examples: (1) orthophosphoric acid solution containing 75 per cent H3PO4 was treated with sodium carbonate to adjust the P2O5 alkali metal oxide ratio to 3:5 and the resulting solution was sprayed at 100 DEG C. into a tower concurrent with heating gases entering at 700-800 DEG C. and leaving at about 380 DEG C. with a moisture content of 100 grams per kilogram. Sodium triphosphate of 97 per cent purity was obtained. (3) Orthophosphoric acid solution was treated with aqueous sodium carbonate solution and after heating to 100 DEG C. was sprayed concurrently with a gas entering the spray tower at 900 DEG C. and leaving at 300 DEG C. The mixture contained 75 per cent sodium pyrophosphate and 24 per cent of triphosphate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE799429X | 1954-03-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB799429A true GB799429A (en) | 1958-08-06 |
Family
ID=6711619
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6821/55A Expired GB799429A (en) | 1954-03-08 | 1955-03-08 | Manufacture of alkali metal phosphates |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB799429A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3310604A1 (en) * | 1982-05-10 | 1983-11-17 | FMC Corp., 19103 Philadelphia, Pa. | Process for the production of sodium tripolyphosphate |
US4536377A (en) * | 1982-05-10 | 1985-08-20 | Fmc Corporation | Process for making sodium tripolyphosphate |
US4671948A (en) * | 1982-07-27 | 1987-06-09 | Rhone-Poulenc Chimie De Base | Anhydrous sodium tripolyphosphate |
US4671947A (en) * | 1981-07-06 | 1987-06-09 | Rhone-Poulenc Industries | Novel sodium orthophosphate |
-
1955
- 1955-03-08 GB GB6821/55A patent/GB799429A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4671947A (en) * | 1981-07-06 | 1987-06-09 | Rhone-Poulenc Industries | Novel sodium orthophosphate |
DE3310604A1 (en) * | 1982-05-10 | 1983-11-17 | FMC Corp., 19103 Philadelphia, Pa. | Process for the production of sodium tripolyphosphate |
US4536377A (en) * | 1982-05-10 | 1985-08-20 | Fmc Corporation | Process for making sodium tripolyphosphate |
US4671948A (en) * | 1982-07-27 | 1987-06-09 | Rhone-Poulenc Chimie De Base | Anhydrous sodium tripolyphosphate |
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