Apparatus useful for wet process phosphoric acid production

Details Apparatus useful for wet process phosphoric acid production Apparatus useful for wet process phosphoric acid production

1978-05-26

1981-04-07

Lutter, Frank W.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

55178, 422232, 423167, 423320, B01J 1918, C01B 25222

Patent

active

042605849

ABSTRACT:
The invention comprises a multi-vessel reaction apparatus useful for reacting phosphate rock and sulfuric acid in which the reaction slurry undergoes intra- and inter- vessel circulation (preferably through a draft tube). The solution portion of the slurry in a first vessel or set of vessels (the "dissolver") is preferably maintained at at lower sulfate ion concentration and the solution portion of the slurry in the second vessel or system of vessels (the "crystallizer") is preferably maintained at a positive sulfate ion concentration. Also preferred are means for maintaining the second vessel or set of vessels at a reduced pressure. Most preferred is that means be included in at least one said vessel for incorporating a crystal modifier (e.g. a sulfonic acid, a sulfonic acid salt, tall oil fatty acids or alkoxylated or esterified tall oil fatty acids) in the crystallizer. The system can be used in the anhydrite, hemihydrate or gypsum types of processes.

REFERENCES:
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patent: 2968544 (1961-01-01), Zeitz et al.
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patent: 3257168 (1966-06-01), Chelminski
patent: 3418077 (1968-12-01), Robinson
patent: 3522004 (1970-07-01), Lopker
patent: 3653826 (1972-04-01), Ishihara et al.
patent: 3726647 (1973-04-01), Somerville
patent: 3939248 (1976-02-01), Caldwell
patent: 4053563 (1977-10-01), Somerville

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