Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1981-11-16
1983-02-08
Yudkoff, Norman
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
62542, 62123, 2105121, B01D 902
Patent
active
043727662
ABSTRACT:
Apparatus comprising a vertical vessel having a lower downwardly pointed conical shell portion, an intermediate shell portion and an upper shell portion wider than the lower and intermediate portions and with all said vessel portions surrounding and defining an unobstructed interior; a conduit for feeding a liquid stream, containing solids less dense than the liquid, tangentially to the vessel intermediate portion interior so that the liquid flows in a helical path therein and then flows downwardly to and in the lower conical portion whereby less dense liquid slurry concentrates in the central area of the lower conical portion and flows upwardly into the vessel upper portion while more dense liquid slurry concentrates in the vessel lower conical portion; a conduit to withdraw more dense liquid slurry from the vessel lower conical portion; and a distributor for directing washing liquid onto the slurry while the slurry is in the vessel upper portion.
A freeze concentration method of separating a liquid from a liquid mixture containing a dissolved material, said liquid being less dense in solid form than in liquid form, comprising cooling the liquid mixture containing the dissolved material to form crystals of the liquid; tangentially feeding the cold liquid mixture containing crystals of the liquid into the intermediate shell portion interior of a vertical vessel having a lower downwardly pointed conical shell portion, an intermediate shell portion and an upper shell portion wider than the lower and intermediate portions and with all said vessel portions surrounding and defining an unobstructed interior, so that the liquid flows in a helical path therein and then flows downwardly to and in the lower conical portion whereby a less dense liquid slurry of the crystals accumulates in the central area of the lower conical portion and flows upwardly into the vessel upper portion while a more dense liquid slurry of the crystals accumulates in the vessel lower conical portion; withdrawing the more dense liquid slurry from the vessel lower conical portion; collecting the less dense liquid slurry in the vessel upper portion and washing the crystal solids therein with the same, but pure, liquid as in the feed stream, and removing the washed crystals from the vessel.
REFERENCES:
patent: 2539019 (1951-01-01), Hill
patent: 2703748 (1955-03-01), Clarke et al.
patent: 2816490 (1957-12-01), Boadway et al.
patent: 3012409 (1961-12-01), Ashley
patent: 3285422 (1966-11-01), Wiley
patent: 4046534 (1977-09-01), Maguire, Sr.
Chicago Bridge & Iron Company
Yudkoff Norman
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