On the Formation of Sodium Bicarbonate by the Process Using Solvent Extraction

Application of the solvent extraction to inorganic synthesis (2nd Report)

Abstract

In the first report, we have described chemical and physical properties of high molecular alkylamine that is fundamentallyimportant to apply the solvent extraction to the sodium bicarbonate production.
NaCl+CO₂+H₂O+Am⇔NaHCO₃+AmHCl (Am: Amine)
Hydrochloric acid byproduced should be extracted and eliminated out of the reaction system by amine in order thatsodium bicarbonate may be produced according to the above equation. Therefore, the reaction equilibrium is determined bythe base strength of amine, and the combination of amine and diluent basic enough to extract hydrochloric acid in thestable pH region of sodium bicarbonate must be selected.
The relationship between absorbed carbon dioxide, produced sodium bicarbonate and amine hydrochloride in theabove reaction has been clarified and the amount of produced sodium bicarbonate has been measured in the various conditionswhere the kind of amine and diluent, the concentration of amine and sodium chloride, and reaction temperature are changed.Solubility of carbon dioxide to the various solvents used in this study is investigated, which' may influence the absorptionrate of carbon dioxide.