Vapor compression distillation apparatus and method

Details Vapor compression distillation apparatus and method Vapor compression distillation apparatus and method

1978-12-21

1981-04-07

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For scale inhibiting or corrosion preventing

203 1, 203 11, 203 26, 203 34, 203 95, 202176, 202177, 202180, 202235, B01D 128, C02F 104, C02F 120

Patent

active

042604613

ABSTRACT:
A vapor compression distillation apparatus and method are provided wherein scaling tendencies are eliminated. The raw feedwater has acid added to it in an amount sufficient to convert the carbonates and/or bicarbonates therein to carbon dioxide. The heated acidified feedwater is then deaerated to remove the carbon dioxide and other non-condensible gases. The deaerated water flows to the evaporator through a line having a valve therein controlled by the liquid level in the deaerator to maintain such level constant even though the tube side of the evaporator is being operated at a pressure less than that of the deaerator. This permits the evaporation to take place under a partial vacuum and at a boiling temperature of less than 212.degree. F. even though the deaerator is operated at atmospheric pressure. Vent steam from the evaporator is added to the deaerator to further preheat the feedwater, and as a sparging or stripping agent to aid in the elimination of carbon dioxide and other non-condensible gases.

REFERENCES:
patent: 2078288 (1937-04-01), Sherman
patent: 2500774 (1950-03-01), Sebald
patent: 2671524 (1954-03-01), Gilwood
patent: 2677433 (1954-05-01), Kretzschmar
patent: 3218241 (1965-11-01), Checkovich
patent: 3245883 (1966-04-01), Loebel
patent: 3300392 (1967-01-01), Ross et al.
patent: 3458972 (1969-08-01), Sood
patent: 3748234 (1973-07-01), Pottharst

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