MULTISTAGE FRACTIONAL FREEZING FOR SUPERPURIFYING CRYSTALLIZABLE SUBSTANCES

摘要

MULTISTAGE FRACTIONAL FREEZING FOR SUPERPURIFYING CRYSTALLIZABLE SUBSTANCES 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.