Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1984-08-24
1985-12-10
Heller, Gregory A.
Chemistry: fertilizers
Processes and products
Inorganic material
71 34, 71 41, 423158, 423321R, C05B 700, C05B 100, C01F 100, C01B 2516
Patent
active
045577480
ABSTRACT:
A process for treating wet-process weak phosphoric acid solution is disclosed which significantly lowers the magnesium impurities in the acid (as well as certain other impurities) permitting subsequent concentration of the acid to levels for use in preparation of liquid fertilizers which are less prone to settling out of the impurities during storage than would be the case without such treatment. It has unexpectedly been found that by limiting evaporation of water from the initial 26% to 32% P.sub.2 O.sub.5 wet-process acid to a level such that the acid has a P.sub.2 O.sub.5 content of from about 42% to about 45% and thereafter maintaining the semi-concentrated acid at a temperature within the range of from about 145.degree. F. to about 270.degree. F. for an aging period containing of from about 24 hours to about 144 hours magnesium impurity crystals are formed of a size, shape and density such that when the acid is subjected to conventional centrifugation, a significant proportion of the magnesium impurities are removed from the acid to substantially avoid heretofore encountered problems associated with precipitation of magnesium compounds during storage of liquid fertilizers prepared from the magnesium purged concentrated acid.
REFERENCES:
patent: 2936888 (1960-05-01), Williams
patent: 3206282 (1965-09-01), Crawford et al.
patent: 3379501 (1968-04-01), Treitler et al.
patent: 3442609 (1969-05-01), Crothers et al.
patent: 3481700 (1969-12-01), Legal et al.
patent: 3528771 (1970-09-01), Shearon et al.
patent: 3642439 (1972-02-01), Moore et al.
patent: 3819810 (1974-06-01), Goldstein
patent: 4136199 (1979-01-01), Mills
patent: 4243643 (1981-01-01), Mills
patent: 4248843 (1981-02-01), Williams et al.
patent: 4299804 (1981-11-01), Parks et al.
Kranz Ken E.
Stewart, Jr. Norman L.
Farmland Industries, Inc.
Heller Gregory A.
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