Kinetics of Absorption of Carbon Dioxide into Sodium Metaborate Solution

Carbon dioxide capture potential of sodium metaborate, which is the main product of the process by means of which hydrogen is obtained from sodium borohydride, was investigated. This work aims at both carbon dioxide capture and finding an alternative use for sodium metaborate. The products of this chemical absorption are sodium carbonate, sodium bicarbonate, and boric acid; all of which are industrially important chemicals. In this study, the kinetics of the reaction between sodium metaborate and carbon dioxide was investigated at atmospheric pressure and temperatures between 17 and 50°C while initial sodium metaborate concentration was changed as 0.5, 1, and 2.5 wt%. The frequency factor and activation energy for this reaction were found as 1.97 × 10⁻³ m³/mol‐s and 18,062 J/mol, respectively.