Absorption of chlorine in aqueous solutions of sodium hydroxide

Absorption of chlorine into aqueous bicarbonate solutions and aqueous hydroxide solutions

“…One way of accomplishing this would be to absorb chlorine into basic aqueous solutions. There have been a few studies on the absorption of C1, into aqueous sodium hydroxide solutions (Spalding, 1962;Takahashi et al, 1967;Hikita et al, 1973;Sandall et al, 1981;Lahiri et al, 1983). However, there has been a great deal of confusion and disagreement in the literature concerning the magnitude of the forward rate coefficient of the reaction between C1, and OH-.…”

“…This suggests that Cl, reacts with HCO; in an aqueous bicarbonate solution. The rate coeficient of the reaction between Cl, and HCO; was estimated over the temperature range of 293 -313 K and ,fitted by the Arrhenius equation: k,, = 5.63 X 10lOexp _.___ ( -4B25).More importantly, under absorption conditions, the amount of hydroxide consumed for absorbing a specific amount of C1, into an aqueous hydroxide solution is almost twice the amount of bicarbonate consumed for absorbing the same amount of Cl, into an aqueous bicarbonate solution.mutter-Hayman, 1962); Spalding (1962) estimated it to be of the order of lo6 m3/(krnol.s) at 298 K while Sandall et al (1981) estimated it to be about 2.7xlO' m3/lkmol.s) at 273 K. On the other hand, other researchers (Takahashi et al, 1967;Hikita et al, 1973;Lahiri et al, 1983) have opted to treat the reaction between C1, and OH-as an instantaneous irreversible reaction, since it is much faster than the reaction between C1, and water. One the other hand, there have not been any published studies regarding the absorption of chlorine into aqueous bicarbonate solutions.In this article, the absorption of C1, into aqueous solutions of sodium hydroxide and into aqueous solutions of potassium bicarbonate is studied both experimentally and theoretically.…”

“…mutter-Hayman, 1962); Spalding (1962) estimated it to be of the order of lo6 m3/(krnol.s) at 298 K while Sandall et al (1981) estimated it to be about 2.7xlO' m3/lkmol.s) at 273 K. On the other hand, other researchers (Takahashi et al, 1967;Hikita et al, 1973;Lahiri et al, 1983) have opted to treat the reaction between C1, and OH-as an instantaneous irreversible reaction, since it is much faster than the reaction between C1, and water. One the other hand, there have not been any published studies regarding the absorption of chlorine into aqueous bicarbonate solutions.…”