GB1267853A - Process for the manufacture of alkali metal phosphates of low vanadium content - Google Patents

Process for the manufacture of alkali metal phosphates of low vanadium content

Info

Publication number
GB1267853A
GB1267853A GB3576769A GB3576769A GB1267853A GB 1267853 A GB1267853 A GB 1267853A GB 3576769 A GB3576769 A GB 3576769A GB 3576769 A GB3576769 A GB 3576769A GB 1267853 A GB1267853 A GB 1267853A
Authority
GB
United Kingdom
Prior art keywords
alkali metal
vanadium
metal phosphates
phosphates
acids
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
GB3576769A
Inventor
Winfried Kern
Horst-Heinrich Weizenkorn
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
Original Assignee
Knapsack 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 filed Critical Knapsack AG
Priority to GB3576769A priority Critical patent/GB1267853A/en
Publication of GB1267853A publication Critical patent/GB1267853A/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
    • C01B25/39—Condensed phosphates of alkali metals
    • C01B25/395—Preparation and dehydrating

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

1,267,853. Alkali metal phosphates. KNAPSACK A.G. 16 July, 1969, No. 35767/69. Heading C1A. In a process of making alkali metal phosphates by neutralizing crude vanadium-containing wetprocess phosphoric acids, containing up to 1000 p.p.m. of vanadium, based on P 2 O 5 , at least 0À3 g./100 g. dissolved P 2 O 5 of the Fe(III) contained in the acids is reduced to Fe(II) by alkali metal and/or alkaline earth metal sulphide. The acids are then neutralized by an alkali metal hydroxide or carbonate to a pH above 4À5, precipitated impurities, e.g. Fe, Al, and Ca phosphates containing vanadium are filtered off, and alkali metal phosphates are separated from the filtrate. The resulting phosphate contains less than 10 p.p.m. (based on P 2 O 5 ) of vanadium. A preferred reducing agent is barium sulphide, which precipitates sulphate and arsenic in addition to reducing trivalent iron. The reducing agents are preferably used in an amount more than 5 times that stoichiometrically required to reduce the Fe<SP>3+</SP>. Alkali metal phosphates containing less than 2 p.p.m. vanadium are obtainable if the amount of Fe(III) reduced is more than 0À8 g./100 g. P 2 O 5 . Sodium phosphate is exemplified.
GB3576769A 1969-07-16 1969-07-16 Process for the manufacture of alkali metal phosphates of low vanadium content Expired GB1267853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3576769A GB1267853A (en) 1969-07-16 1969-07-16 Process for the manufacture of alkali metal phosphates of low vanadium content

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3576769A GB1267853A (en) 1969-07-16 1969-07-16 Process for the manufacture of alkali metal phosphates of low vanadium content

Publications (1)

Publication Number Publication Date
GB1267853A true GB1267853A (en) 1972-03-22

Family

ID=10381357

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3576769A Expired GB1267853A (en) 1969-07-16 1969-07-16 Process for the manufacture of alkali metal phosphates of low vanadium content

Country Status (1)

Country Link
GB (1) GB1267853A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014755A1 (en) * 1978-12-23 1980-09-03 Hoechst Aktiengesellschaft Process for producing alkaliphosphate solutions free of zinc
EP0053694A1 (en) * 1980-12-04 1982-06-16 Hoechst Aktiengesellschaft Process for reducing iron from a phosphoric-acid solution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014755A1 (en) * 1978-12-23 1980-09-03 Hoechst Aktiengesellschaft Process for producing alkaliphosphate solutions free of zinc
EP0053694A1 (en) * 1980-12-04 1982-06-16 Hoechst Aktiengesellschaft Process for reducing iron from a phosphoric-acid solution

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