B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
161/35
B01D 9/04 (2006.01) B01D 9/00 (2006.01) C02F 1/22 (2006.01)
Patent
CA 1316810
MULTISTAGE FRACTIONAL FREEZING FOR SUPERPURIFYING CRYSTALLIZABLE SUBSTANCES Abstract of the Disclosure A method and apparatus are provided for superpurifying crystallizable substances to a purity level of 99.999 percent. Included is controlling the reflux ratio by controlling and/or metering transfers of crystals and mother liquor at selected locations and by maintaining a steady state of transfers between a plurality of stages that carry out similar operations.
609630
Griffiths Kenneth F.
Osler Hoskin & Harcourt Llp
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