Claims
- 1. A method of modifying sodium carbonate crystals produced from a natural source which comprises the following steps in sequence:
a) crushing and calcining a natural sodium carbonate-containing product; b) dissolving the calcined product in water; c) decanting the resultant supernatant liquid from solid residues; d) adding a cationic amine compound to the supernatant liquid from step c) at a rate of about 0.017-0.021 gallons per ton of sodium carbonate produced; e) filtering the reaction product from step d); and f) crystallizing the solution of step e).
- 2. A method according to claim 1 wherein said cationic compound is a quaternary amine.
- 3. A method according to claim 1 wherein the product of step f) is reacted with water and carbon dioxide to produce sodium bicarbonate at an improved carbon dioxide uptake rate.
- 4. In a method of producing sodium carbonate from trona ore wherein the ore is crushed, calcined, dissolved in water, and the resultant supernatant liquid decanted from the solid residue, filtered and crystallized, the improvement comprising
adding an amine additive at a rate of at least about 0.017 gallons per ton of sodium carbonate produced, prior to the filtration of said decanted supernatant liquid.
- 5. The method of claim 4 wherein the quaternary amine comprises sulfonated ethoxylated ethylbis(hydroxyethyl)tallow.
- 6. In a method of producing sodium carbonate from modified sodium carbonate crystals produced from trona ore wherein the ore is crushed, calcined, dissolved in water and the resultant supernatant liquid decanted from the solid residue and filtered, the improvement comprising
adding an amine additive at a rate of about 0.017-0.021 gallons per ton of sodium carbonate produced, prior to the filtration of said decanted supernatant liquid, such that the resultant modified sodium carbonate crystals, when dissolved in water, have increased reactivity with carbon dioxide to form sodium bicarbonate crystals at an increased rate.
- 7. A method according to claim 6 wherein the amine is added continuously to the decanted supernatant liquid.
- 8. A method according to claim 6 wherein the average uptake of carbon dioxide is 0.012 mols/min.
Parent Case Info
[0001] This invention is a continuation-in-part of copending application Ser. No. 08/821,397 filed Mar. 20, 1997.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08821397 |
Mar 1997 |
US |
Child |
09392443 |
Sep 1999 |
US |