Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent... – For scale inhibiting or corrosion preventing
Patent
1973-08-13
1976-04-20
Sofer, Jack
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
For scale inhibiting or corrosion preventing
203 11, 203 22, 203 23, 203 24, 203 27, 203 79, 203 88, 203100, 202173, 202174, 202177, 202233, 159 16S, 159 45, 159 47R, 159DIG8, 159DIG13, B01d 300, B01d 306, B01d 310, B01d 302
Patent
active
039517527
ABSTRACT:
Saline water, typically sea water or brackish water, after deaeration and deoxygenation is preheated, then further heated by steam condensing with the preheated saline water. By the further heating, bicarbonates are thermally decomposed, forming carbon dioxide, while scale compounds, comprising magnesium hydroxide, anhydrite and minor compounds containing silica, iron, alumina, phosphate, etc., are thermally precipitated. Some of the steam is uncondensed and issues from the further heated saline water with included, evolved carbon dioxide. It is condensed in preheating saline water; evolved carbon dioxide is separated from the condensate and recycled to the saline water to prevent alkaline scale in preheating, while condensate is combined with the further heated saline water, forming post-thermal saline water. This is flash vaporized while cooling and the steam is regenerated by compressing the flashed vapors. Cooled, post-thermal saline water is evaporated preferably in a vapor compression evaporator to form fresh water and saline water residuum.
REFERENCES:
patent: 2979442 (1961-04-01), Badger
patent: 3026261 (1962-03-01), Mayfield et al.
patent: 3119752 (1964-01-01), Checkovitch
patent: 3218241 (1965-11-01), Checkovitch
patent: 3389059 (1968-06-01), Goeldner
patent: 3399975 (1968-09-01), Otten
patent: 3420775 (1969-01-01), Cadwallader
patent: 3476654 (1969-11-01), Sieder
patent: 3607666 (1971-09-01), Roller
A, F, G Teach seeding of brine and G with anhydrite. B shows vapor compression of saline vapors and treatment of saline with anhydrite. D is similar to C, E treats saline water with acid and phosphate. I removes CO.sub.2 and adds same to saline. L shows a multistage flash-multiple effect evaporator.
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