Process for pre-treating and desalinating sea water
First Claim
1. A process for treating sea water comprising(A) adding to said sea water about 0.1 to about 60 g/L of a compound selected from the group consisting of sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, aluminum hydroxide, aluminum sulfate, aluminum potassium sulfate, and mixtures thereof, whereby a precipitate of a calcium compound forms in said water;
- (B) separating said precipitate from said water; and
(C) desalinating said water to a first stream that has lower concentration of dissolved solids and an second stream that has a higher concentration of dissolved solids, and(1) a mixture is formed of said second stream and said sea water;
(2) a sufficient amount of said compound is added to said mixture to bring its concentration within a range of about 0.1 to about 60 wt %; and
(3) said mixture is recycled to step (B).
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Abstract
Water containing dissolved salts, such as calcium sulfate, calcium chloride, magnesium sulfate, magnesium chloride, sodium carbonate, sodium chloride, sodium sulfate, calcium bicarbonate, and mixtures thereof, is treated to reduce the concentration of those salts. About 0.1 to about 60 g/L of sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, calcium hydroxide, calcium carbonate, aluminum hydroxide, aluminum sulfate, aluminum potassium sulfate, and mixtures thereof is added to the water, whereby a precipitate forms in the water. The precipitate is separated from said water and the water is desalinated using reverse osmosis, flash evaporation, or another method. The process is preferably performed by first adding calcium oxide or calcium hydroxide, separating the precipitate that forms, then adding sodium hydroxide and sodium carbonate to form a second precipitate.
83 Citations
17 Claims
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1. A process for treating sea water comprising
(A) adding to said sea water about 0.1 to about 60 g/L of a compound selected from the group consisting of sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, calcium oxide, calcium hydroxide, calcium carbonate, aluminum hydroxide, aluminum sulfate, aluminum potassium sulfate, and mixtures thereof, whereby a precipitate of a calcium compound forms in said water; -
(B) separating said precipitate from said water; and (C) desalinating said water to a first stream that has lower concentration of dissolved solids and an second stream that has a higher concentration of dissolved solids, and (1) a mixture is formed of said second stream and said sea water; (2) a sufficient amount of said compound is added to said mixture to bring its concentration within a range of about 0.1 to about 60 wt %; and (3) said mixture is recycled to step (B). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
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12. A process for treating sea water to reduce the concentration of salts therein comprising
(A) adding to said sea water about 0.04 to about 40 g/L of a compound selected from the group consisting of calcium hydroxide, calcium oxide, and mixtures thereof, whereby a first precipitate that comprises calcium hydroxide is formed; -
(B) separating said first precipitate from said water; (C) adding to said water about 0.01 to about 60 g/L sodium carbonate and about 0.04 to about 40 g/L sodium hydroxide, whereby a second precipitate that comprises magnesium hydroxide is formed; (D) separating said second precipitate from said water; and (E) desalinating said water using reverse osmosis to produce a first stream that has a lower concentration of dissolved solids and a second stream that has a higher concentration of dissolved solids, and (1) a mixture is formed of said second stream and said sea water; (2) a sufficient amount of said compound is added to said mixture to bring its concentration within a range of about 0.4 to about 40 g/L; and (3) said mixture is recycled to step (C). - View Dependent Claims (13, 14)
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15. A process for treating sea water to reduce the concentration of dissolved salts therein comprising
(A) adding to said sea water about 0.4 to about 40 g/L of a compound selected from the group consisting of calcium hydroxide, calcium oxide, and mixtures thereof, whereby a first precipitate that comprises calcium hydroxide is formed; -
(B) separating said first precipitate from said water; (C) adding to said water about 0.1 to about 60 g/L sodium carbonate and about 0.04 to about 40 g/L sodium hydroxide , whereby a second precipitate that comprises magnesium hydroxide is formed; (D) separating said second precipitate from said water; and (E) desalinating said water using flash evaporation to produce a first stream that has a lower concentration of dissolved solids and a second stream that has a higher concentration of dissolved solids, and (1) a mixture is formed of said second stream and said sea water; (2) a sufficient amount of said compound is added to said mixture to bring its concentration within a range of about 0.4 to about 40 g/L; and (3) said mixture is recycled to step (C). - View Dependent Claims (16)
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Specification