Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1975-02-03
1976-10-26
Emery, Stephen J.
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
159DIG5, 23273F, 162 29, 162 16, 62542, 62543, 62544, B01D 904
Patent
active
039876411
ABSTRACT:
Pulping liquor borne solids are concentrated within an aqueous solution by a successive plurality of freezing steps wherein a discrete quantity of the solution is crystallized in each step by freezing. The water crystals from each freezing step are subsequently separated from the remaining liquid solution by screening and applying axial pressure to the crystalline mass. Greater efficiencies may be obtained in some cases by mixing or reslurrying a pressed, crystalline mass and pressing a second time. Another auxiliary separation step comprises a quiescent thaw of the crystalline mass from the first two press steps to permit additional dissolved solids to be drained away from the purified water ice.
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Emery Stephen J.
Marcontell W. Allen
Schmalz Richard L.
Westvaco Corporation
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