C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/67
C01B 25/30 (2006.01)
Patent
CA 1274968
PROCESS FOR MAKING ALKALI METAL PHOSPHATE SOLUTIONS CONTAINING LITTLE VANADIUM ABSTRACT OF THE DISCLOSURE Alkali metal phosphate solutions containing little vanadium are made from phosphoric acid containing vana- dium. To this end, a negative redox potential is estab- lished in the phosphoric acid by addition of a reductant the acid is partially neutralized and an alkali metal- phosphorus-molar ratio between 0.85 and 1.0 is estab- lished, the partial neutralization being continued over a period of at least 10 minutes. The partially neutralized acid is not filtered intermediarily and the alkali metal/ phosphorus-molar ratio is increased to 1.9 to 2.1 in a second neutralization stage, collected precipitate is separated and processed, if desired.
490768
Damman Bernardus J.
Jelsma Andries
Kinneging Johannes-Wilhelmus
Roos Wouter
von Schenck Raban
Damman Bernardus J.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Jelsma Andries
Kinneging Johannes-Wilhelmus
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