Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1976-11-02
1978-02-21
Thomas, Earl C.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
C01B 2516
Patent
active
040753050
ABSTRACT:
A continuous procedure is disclosed for the wet-process manufacture of phosphoric acid in a reaction zone and continuously cooled by means of evaporation into air circulating at the surface of the reaction zone. The evaporated gases are scrubbed by using part of the water needed for the methodic washing of the calcium sulfate, whereby the solution obtained is collected and passed into the reaction zone in such a way as to cause the soluble gaseous products to return to the reaction medium, from which they are collected with strong acid, which constitutes production. The procedure gives rise to no liquid pollutants, particularly fluorine, and does not increase the amount of water consumed.
REFERENCES:
patent: 3498746 (1970-03-01), Smaltz et al.
patent: 3498747 (1970-03-01), Smaltz et al.
patent: 3699212 (1972-10-01), Palm
patent: 3720757 (1973-03-01), Hartig
patent: 3793436 (1974-02-01), Hartig
patent: 3795728 (1974-03-01), Scheel
patent: 3859423 (1975-01-01), Hartig
Slack-Phosphoric Acid-pp. 752 to 760 - 1968.
Atmospheric Emission from WDA Manufacture - 1970 - H.E.W. - pp. 14 & 15.
Rhone-Poulenc Industries
Thomas Earl C.
Wheelock Eugene T.
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