Method of manufacturing of technical grade sodium bicarbonate

This site presents information about the patent 161858, the water saving technology of production of sodium bicarbonate NaHCO3 (baking soda), best for cleaning from the brine and crystals of ammonium bicarbonate.

This is the environmentally friendly industrial technology (contrary to the Solvay process).

The abstract of the Polish patent 161858:

1. The patent 161858, granted to Ma.E. Bogdan Borkowski and Jerzy Krol-Bogomilski PhD, presents a new commercial product with many industrial uses. It is sodium bicarbonate, best for cleaning. People use it in a slurry form to remove paint or other dirt from various surfaces. Sodium bicarbonate is used as a constituent of many household chemicals.

2. Its manufacturing according to the pat. 161858 lets save costs, energy and water, and substantially decreases the amount of wastewater.

3. The sodium hydrogen carbonate may be produced by the reaction of crystalline ammonium hydrogen carbonate with the brine to precipitate crystals of the title compound:
   
   NH4HCO3 + NaCl → NaHCO3 + NH4Cl

4. One may also produce it by the reaction of carbon dioxide and ammonia with the brine to precipitate crystals of sodium bicarbonate, as in the Solvay method, the method of soda ash production:
   
   NH3 + CO2 + H2O + NaCl → NaHCO3 + NH4Cl

5. An important process is washing of the raw sodium bicarbonate several times by a dilute aqueous soda (Na2CO3) solution, to remove other salts (NH4Cl). During the washing (in a flow of CO2) the two following reactions occur which prevent contamination and loss of the crystals:
   
   Na2CO3 + 2NH4Cl → (NH4)2CO3 + 2NaCl
   
   CO2 + H2O + Na2CO3 → 2NaHCO3

6. The final process is drying of the sodium hydrogen carbonate below 40^oC in a flow of carbon dioxide.

7. It is useful not to calcify and subsequently re-precipitate sodium bicarbonate again. It increases its yield, and lowers the use of water and the total costs.

8. The sodium bicarbonate so obtained contains from 95% to 98% of the title compound that is satisfying for many industrial uses.

9. Since the two time and energy consuming processes: calcification and subsequent re-precipitation of the sodium hydrogen carbonate are omitted, its yield increases by 30%.

10. See my other page (environmentally friendly chemical manufacturing): Waste calcium chloride (CaCl2) as a source of economic possibilities, Ma.E. B. Borkowski and Dr. Jerzy Krol-Bogomilski, Chemik, 43 (7), 181, (1990),

11. See my another page: Method of manufacturing of technically pure hydrochloric acid (HCl) and other products (CaSO4, NH3) using waste from soda ash production, Patent App. P-280653, 19.07.1989, B. Borkowski, Jerzy Krol-Bogomilski.

12. The patented process is cheap to realize, and does not require much investment. If you invest in it, you will get the big return in the recession time.

More information about sodium bicarbonate

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Bicarbonate

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