1987 Harbolt Union Oil 4710360 dissolving urea
This patent describes an apparatus for endothermic dissolutions in water including a mixing tank, wherein solute is slurried with water; pump and spray pipe, for spraying the slurry into a spray box and a fan for drawing ambient air upwardly in direct heat exchange with the descending slurry droplets. Dissolution is promoted as the droplets extract heat from the countercurrent flow of air.
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