Concentrating evaporators – Closed evaporating chambers – Indirectly heated
Patent
1974-09-25
1976-08-31
Sofer, Jack
Concentrating evaporators
Closed evaporating chambers
Indirectly heated
159 1R, 159DIG11, 159DIG16, 159 44, 159 47R, B01D 100
Patent
active
039779351
ABSTRACT:
A method of evaporating liquids to separate solid substances contained therein to form a residue of the substances characterized by applying subatmospheric pressure to at least one discrete portion of the liquid at a first pressure level and subsequently applying subatmospheric pressure to the discrete portion at a second pressure level lower than the first level to gradually evaporate the liquid from the discrete portion thereby leaving a residue of solid substances. Apparatus for performing the foregoing method preferably comprises an enclosure within which a support means is used for supporting at least one discrete portion of the liquid to be separated, a vacuum pump connected to the enclosure for evacuating atmosphere from within the enclosure, and a valve means between the pump and enclosure operable automatically to apply first and second subatmospheric pressure levels to within the enclosure. The apparatus may also be provided with: conduits for supplying cooling fluid to within the enclosure for cooling the liquid to be evaporated; a radiant heating element beneath the support means to heat the liquid to be evaporated; and a vibrator for vibrating the liquid to be evaporated to aid in separation of the liquid from the solid substances desired as a residue.
REFERENCES:
patent: 2064609 (1936-12-01), Humble
patent: 2434672 (1948-01-01), Pattee
patent: 2496054 (1950-01-01), Hoyler
patent: 2744629 (1956-05-01), Vine
patent: 2957773 (1960-10-01), Toulmin, Jr.
patent: 2969111 (1961-01-01), Bocognono
patent: 3304990 (1967-02-01), Ontko et al.
patent: 3827476 (1974-08-01), Biesinger
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