Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1979-02-26
1980-12-02
Yudkoff, Norman
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
62532, 62123, B01D 904
Patent
active
042363829
ABSTRACT:
In the Improved Vacuum-Freezing High Pressure Ice Melting Process, an aqueous solution is flash vaporized under a reduced pressure to simultaneously form a low pressure water vapor and ice crystals. The ice formed is first purified in a counter-washer and then melted inside of heat conductive conduits under a high pressure (e.g. 600 atm.) and the low pressure water vapor is desublimed to form desublimate (ice) on the outside of the conduits. The latent heat of desublimation released is utilized in supplying the heat needed in the ice-melting operation. The desublimate is removed intermittently by an in-situ dissolution operation utilizing an aqueous such as the feed solution or the concentrate; about an equivalent amount of ice is formed inside of the conduits by an exchange freezing operation. The ice so formed is also melted by the high pressure ice melting operation described. The process uses components that are available commercially and can be reliably operated. The process is highly energy efficient and cost competitive with other desalination processes and conventional evaporation processes. The process is useful in desalination of brackish water and sea water and in concentrating industrial aqueous solutions.
REFERENCES:
patent: 3690116 (1972-09-01), Cheng
Cheng Chen-Yen
Cheng Sing-Wang
Cheng Wu-Cheng
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