GB799429A - Manufacture of alkali metal phosphates - Google Patents

Manufacture of alkali metal phosphates

Info

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
Application number
GB6821/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knapsack AG
Knapsack Griesheim AG
Original Assignee
Knapsack AG
Knapsack Griesheim AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knapsack AG, Knapsack Griesheim AG filed Critical Knapsack AG
Publication of GB799429A publication Critical patent/GB799429A/en
Expired legal-status Critical Current

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.
GB6821/55A 1954-03-08 1955-03-08 Manufacture of alkali metal phosphates Expired GB799429A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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