Method for production of sodium bicarbonate, sodium carbonate and ammonium sulfate from sodium sulfate
First Claim
1. A method of scrubbing sulfur compounds from gas containing sulfur oxide compounds and recovering inorganic values, comprising the steps of:
- a. providing a sodium sulfate solution;
b. contacting said solution with carbon dioxide and ammonia or ammonium ions while maintaining a solution temperature of at least 32°
C. to form a precipitate of sodium bicarbonate;
c. recovering as a product said precipitate of sodium bicarbonate in step b.;
d. filtering precipitated sodium bicarbonate;
e. treating the remaining solution of step c. with sufficient ammonia of ammonium ions to form a saturated solution of ammonium sulfate and a precipitate of sodium sulfate from said solution;
f. recovering as a product said precipitate of sodium sulfate;
g. recovering ammonium sulfate as a product from the remaining solution from step e.;
h. rehydrating said precipitate of sodium bicarbonate to form a concentrated sodium bicarbonate solution; and
i. introducing said sodium bicarbonate solution into a conditioning vessel for the removal of a sulfur oxide compound.
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Accused Products
Abstract
There is disclosed a process for recovering sodium bicarbonate and forming ammonium sulfate from a source containing sodium sulfate. The method involves contacting the sodium sulfate in solution with carbon dioxide and a compound containing ammonia. Sodium bicarbonate is precipitated in high purity form from the solution. It is important to maintain the temperature of the source solution at or above 32° C. This provision eliminates contamination of hydrates or ammonium bicarbonate components. The filtrate of the sodium bicarbonate reaction can be further processed to yield an ammonium sulfate product in the concentrated liquid or precipitated form in high purity. The basic process can be expanded to be combined with a conventional Claus process for sulfur recovery as a Tail Gas Unit, or can be further employed in a wet and dry scrubbing process for FGD schemes.
12 Citations
22 Claims
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1. A method of scrubbing sulfur compounds from gas containing sulfur oxide compounds and recovering inorganic values, comprising the steps of:
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a. providing a sodium sulfate solution; b. contacting said solution with carbon dioxide and ammonia or ammonium ions while maintaining a solution temperature of at least 32°
C. to form a precipitate of sodium bicarbonate;c. recovering as a product said precipitate of sodium bicarbonate in step b.; d. filtering precipitated sodium bicarbonate; e. treating the remaining solution of step c. with sufficient ammonia of ammonium ions to form a saturated solution of ammonium sulfate and a precipitate of sodium sulfate from said solution; f. recovering as a product said precipitate of sodium sulfate; g. recovering ammonium sulfate as a product from the remaining solution from step e.; h. rehydrating said precipitate of sodium bicarbonate to form a concentrated sodium bicarbonate solution; and i. introducing said sodium bicarbonate solution into a conditioning vessel for the removal of a sulfur oxide compound. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of scrubbing sulfur compounds from gas containing sulfur oxide compounds in a conditioning vessel, comprising the steps of:
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a. providing a sodium sulfate solution; b. contacting said solution with carbon dioxide and ammonia or ammonium ions while maintaining a solution temperature of at least 32°
C. to form a precipitate of sodium bicarbonate;c. recovering as a product said precipitate of sodium bicarbonate in step b.; d. filtering precipitated sodium bicarbonate; e. treating the remaining solution of step c. with sufficient ammonia or ammonium ions to form a saturated solution of ammonium sulfate and a precipitated sodium sulfate from said solution; f. washing residual sodium sulfate out of said precipitate of sodium bicarbonate; g. dehydrating said precipitate of sodium bicarbonate; and h. introducing dry sodium bicarbonate into said conditioning vessel for the removal of a sulfur oxide compound. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of scrubbing sulfur compounds from gas containing sulfur oxide compounds, comprising the steps of:
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a. providing a source of sodium sulfate solution; b. contacting said source of sodium sulfate with carbon dioxide and ammonia or ammonium ions while maintaining a solution temperature of at least 32°
C. to form a precipitate of sodium bicarbonate;c. recovering as a product said precipitate of sodium bicarbonate in step b.; d. filtering precipitated sodium bicarbonate; i. converting said precipitate of sodium bicarbonate into a sodium carbonate precipitate; and j. introducing dry sodium carbonate into a conditioning vessel for removal of a sulfur oxide compound. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of scrubbing sulfur compounds from gas containing sulfur oxide compounds, comprising the steps of:
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a. providing a source of sodium sulfate solution; b. contacting said source of sodium sulfate with carbon dioxide and ammonia or ammonium ions while maintaining a solution temperature of at least 32°
C. TO form a precipiate of sodium bicarbonate;c. recovering as a product said precipitate of sodium bicarbonate in step b.; d. filtering precipitated sodium bicarbonate; e. treating the remaining solution of step c. with sufficient ammonia or ammonium ions to form a saturated solution of ammonium sulfate and a precipitate of sodium sulfate from said solution; f. recovering as a product said precipitate of sodium sulfate; g. recovering ammonium sulfate as a product from the remaining solution of step f.; h. washing residual sodium sulfate out of said sodium bicarbonate precipitate; i. converting said precipitate of sodium bicarbonate into a sodium carbonate precipitate; and j. introducing dry sodium carbonate into a conditioning vessel for removal of a sulfur oxide compound.
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Specification