Multistage fractional freezing for superpurifying crystallizable

Details Multistage fractional freezing for superpurifying crystallizable Multistage fractional freezing for superpurifying crystallizable

1988-08-31

1989-12-05

Capossela, Ronald C.

Refrigeration

Processes

Fractionally solidifying a constituent and separating the same

62123, B01D 904, C02F 122

Patent

active

048850160

ABSTRACT:
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 liquid at selected locations and by maintaining a steady state of transfers between a plurality of stages that carry out similar operations.

REFERENCES:
patent: Re32241 (1986-09-01), Saxer
patent: 3128188 (1964-04-01), McIntire
patent: 3992900 (1976-11-01), Campbell
patent: 4143524 (1979-03-01), Thijssen
patent: 4430104 (1984-02-01), VanPelt
patent: 4666456 (1987-05-01), Thijssen et al.

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