Phosphoric acid process with high circulation rates
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United States of America Patent
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Jul 7, 1981
Issued Date -
N/A
app pub date -
May 26, 1978
filing date -
Dec 29, 1977
priority date (Note) -
Expired
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Abstract
Phosphoric acid is prepared from phosphate rock and sulfuric acid by using a reaction train comprising a dissolving slurry and a crystallization slurry maintained at different sulfate levels. Both inter and intra vessel circulation are used at high rates to minimize reagent concentration gradients and temperature gradients and provide a suitable crystallization environment. Preferably, the intra vessel circulation is substantially in plug flow, as through a draft tube.
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