Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1983-04-11
1984-02-07
Heller, Gregory A.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423320, C01B 2516
Patent
active
044303130
ABSTRACT:
Black wet process phosphoric acid contains suspended and precipitated organic material and inorganic material. Upon standing, the precipitated material (mostly gypsum) forms a cake that is very difficult to be resuspended. By adding small amounts of nitric acid to the black acid, the nature of the precipitated material is changed and it does not cake and can be easily resuspended with slight agitation. Thus, the treated black acid can be shipped and stored and it can be clarified at the destination by adding water.
REFERENCES:
patent: 3423170 (1969-01-01), Edwards
patent: 4048289 (1977-09-01), Pierres
patent: 4279877 (1981-07-01), Hill et al.
LaVanture Mark D.
Walker George L.
Gilman M. G.
Heller Gregory A.
Kenehan, Jr. E. F.
McKillop A. J.
Mobil Oil Corporation
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