Absorption of chlorine into aqueous bicarbonate solutions and aqueous hydroxide solutions

Modeling Cl2 formation from aqueous NaCl particles: Evidence for interfacial reactions and importance of Cl2 decomposition in alkaline solution

“…The reported values in Table 11 should be viewed with the recognition that many rate constants were determined at different temperatures and ionic strengths. The inconsistency in the studies do not allow for a clear deduction of temperature effects, though it is noted that Ashour et al [1996] do report a weak temperature. However, using the temperature dependence of the chlorine hydrolysis equilibrium constant, the water equilibrium product, K w [ Whitfield , 1975], and activity coefficient estimates, the following equilibrium expression can be determined, with a value of 9 × 10 10 at 273 K and a value of 4 × 10 10 at 298 K (both at I = 0.5 M).…”

“… Ashour et al [1996] determined an expression for the rate constant of Cl 2 + HCO 3 − + H 2 O in the temperature range of 293–312 K by studying potassium bicarbonate solutions (0.1 to 0.4 M initial concentration) at pH values near 8.5. Their experimental conditions were such that [CO 3 2− ]/[HCO 3 − ] ≈ 0.011.…”

“… Ashour et al [1996] measured the rate of Cl 2 absorption into aqueous sodium hydroxide (0.1 M NaOH) solutions in the temperature range of 293–312 K. Extrapolating the resulting temperature dependent expression, the rate constant for the reaction of Cl 2 + OH − is calculated at 1.3 × 10 9 M −1 s −1 at 288 K (2.9 × 10 9 M −1 s −1 at 298 K), below that predicted by the Bronsted–Pedersen extrapolation using H 2 O/H 3 O + but nevertheless above that predicted without using hydronium in the linear free energy relation (see Table 10 and Figure 10).…”

Chemical Reaction Engineering Analysis of the Blowout Process for Bromine Manufacture from Seawater

“…At high pH in alkaline solutions there is competition between reaction with water and OH -ions, with differences in caustic and bicarbonate solutions being attributed to different reactivity with bicarbonate ions. 4 . Quite recently, the absorption of chlorine into aqueous acidic sulfite (S(IV)) solutions has been studied experimentally and theoretically to identify the ways the gas-liquid reaction affected the mass transfer regime.…”

Demanda De Hidróxido De Sódio Na Neutralização De Gás Cloro Em Torres De Absorção Simulada No Software Aspen Plus / Sodium Hydroxide Demand in Chlorine Gas Neutralization in Simulated Absorption Towers in Aspen Plus Software

“…Esses dois últimos equipamentos representam fisicamente a torre de absorção. Citase ainda que a influência do arraste é dada como desprezível, baseando-se na afirmação de que é uma reação muito rápida e de alta convergência(ASHOUR, 1996). A Figura 4 mostra o arranjo de equipamentos para operações unitárias e a reação, bem como as correntes que ocorrem.…”