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Process for the preparation of porous sodium bicarbonate

阅读：231发布：2023-04-01

专利汇可以提供Process for the preparation of porous sodium bicarbonate专利检索，专利查询，专利分析的服务。并且Disclosed is a process for preparing hard, porous granules of sodium bicarbonate having a surface area greater than 0.5 square meter per gram. The process involves reacting ammonium bicarbonate with a soluble sodium salt in aqueous solution wherein the concentration Na is greater than about 2.5 gram ions per liter and the concentration of HCO3 is greater than about 0.04 gram ions per liter, while agitating the solution and adding carbon dioxide thereto in an amount sufficient to create a partial pressure of from 15 to 40 psig. The sodium bicarbonate crystals formed during the reaction are separated from the aqueous solution and dried at a temperature of from about 20* to about 75*C. The sodium bicarbonate product is especially useful for removing SO2, as well as other acid gases, from flue gas due to its high surface area.，下面是Process for the preparation of porous sodium bicarbonate专利的具体信息内容。

权利要求

1. A PROCESS WHICH COMPRISES: A. REACTING AMMONIUM BICARBONATE WITH A SOLUBLE SODIUM SALT IN AQUEOUS SOLUTION, WHEREIN THE CONCENTRATION OF SODIUM ION IS GREATER THAN ABOUT 2.5 GRAM IONS PER LITER AND THE BICARBONATE ION CONCENTRATION IS GREATER THAN ABOUT 0.04 GRAM IONS PER LITER, IN THE PRESENCE OF CARBON DIOXIDE IN SUFFICIENT QUANTITY TO CREATE A PARTIAL PRESSURE OF FROM 15 TO 40 PSIG WHILE AGITATING THE SOLUTION WITH SUFFICIENT VIGOR TO FORM CRYSTALS OF SODIUM BICARBONATE HAVING LONGEST DIMENSIONS WHICH VARY FROM 1 TO 10 MICRONS; B. SEPARATING THE SODIUM BICARBONATE CRYSTALS FROM THE SOLUTION AND COMPACTING THEM; AND C. DRYING THE CRYSTALS AT A TEMPERATURE OF FROM ABOUT 20* TO ABOUT 75*C.

2. The process of claim 1 wherein the sodium ion concentration is 5 to 7 gram ions per liter.

3. The process of claim 1 wherein the sodium ion concentration is less than 13 gram ions per liter.

4. The process of claim 1 wherein the bicarbonate concentration is from 0.08 to 0.12 gram ions per liter.

5. The process of claim 1 wherein the partial pressure of carbon dioxide is from 20 to 30 psig.

6. The process of claim 1 wherein the total pressure is 75 psig.

7. The process of claim 1 wherein the sodium bicarbonate crystals are separated from the solution and compacted by filtration.

8. The process of claim 1 wherein the sodium bicarbonate crystals are dried at a temperature of from 30* to 40*C.

9. A process for the preparation of hard porous granules of sodium bicarbonate which comprises: a. reacting a 6 to 30 weight percent solution of sodium hydroxide to which has been added a sufficient amount of a sodium salt to produce a solution having a sodium ion concentration of at least about 2.5 gram ions per liter with ammonia and carbon dioxide wherein the carbon dioxide is present in an amount sufficient to produce a partial pressure of from 15 to 40 psig while agitating the solution with sufficient vigor to form crystals of sodium bicarbonate having longest dimensions which vary from 1 to 10 microns; b. separating the sodium bicarbonate from the solution; and c. drying the sodium bicarbonate crystals at a temperature of from about 20* to about 75*C.

10. The process of claim 9 wherein ammonia is in an amount less than 3 weight percent of the solution.

11. A process for the preparation of hard porous granules of sodium bicarbonate which comprises: a. reacting ammonium bicarbonate and carbon dioxide with a 6 to 30 weight percent solution of sodium hydroxide to which has been added a sufficient amount of a sodium salt to produce a solution having a sodium ion concentration of at least about 2.5 gram ions per liter wherein the carbon dioxide is present in an amount sufficient to produce a partial pressure of from 15 to 40 psig while agitating the solution with sufficient vigor to form crystals of sodium bicarbonate having longest dimensions which vary from 1 to 10 microns; b. separating the sodium bicarbonate crystals from the solution; and c. drying the sodium bicarbonate crystals at a temperature of from about 20* to about 75* C.

12. The process of claim 11 wherein the solution contains 8 to 15 weight percent sodium hydroxide and from 10 to 15 weight percent sodium chloride.

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Process for the preparation of porous sodium bicarbonate

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