Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1976-05-17
1978-09-26
Sever, Frank
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
62541, B01D 904
Patent
active
041166523
ABSTRACT:
The invention is directed to freeze concentration of liquid mixtures including solutions by the direct contacting in at least two stages, of the mixture with a miscible refrigerant. After the contacting of the refrigerant with the liquid mixture, there is provided a first stage crop of substantially pure crystals of a mixture component which is separated from the mother liquor. The mother liquor is then further cooled and crystallized in further stages. Any crystals from said further stages are returned to the first or preceeding stage. This concentrates the second stage and further stage mother liquors.
This process is applicable to the freeze concentration of juices, coffee or tea extracts and beers. It also may be utilized for the purification of brackish water. The purity of the first stage crystals is assured by controlled crystal growth. The successive stages provide for a complete concentration of the residual matter in the mother liquor. When the residual matter in the mother liquor is the desired product, it is recovered in very concentrated form. Should the crystals from the first stage be the desired product, their high degree of purity is advantageous.
REFERENCES:
patent: 3167401 (1965-01-01), Herman
patent: 3182463 (1965-05-01), Stearns
patent: 3250081 (1966-05-01), Othmer
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Sever Frank
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