Exact and approximate solutions of the utilization and yield equations for O2(1Delta) generators

Generation of singlet delta oxygen--a technology update

“…The various generators differ in the way the specific surface area per unit volume is produced: Since the lifetime of O2('L9) is finite, gas phase mass transport processes may influence the yield of singlet oxygen as well as limiting the chlorine absorption rate. This effect [2] actually degrads the performance of oxygen generators less than previously thought. The 02(12g) in all these reactors is formed in a very thin film -several hundred Angstromsnear the surface of the BHP solution -by the reaction of chlorine with BHP.…”

“…The mechanism for the generation of O2('g) by chlorine absorption in basic hydrogen peroxide solution was established by Hurst [3] and McDermott [4] Cl2 + H02 O2(L19) + 2C1 + H (1) H02 + H H202 (2) The rate of reaction of chlorine with the hydroperoxy anion is of second order, depending on both the local concentrations of chlorine and the hydroperoxy anion. Since this is an ionic reaction, we would expect that the local electrical environment as measured by the ionic strength of the solution, will influence the rate k1.…”

“…This paper is an extension of a previous paper [1] on this same topic. The reader is also refered to a companion paper [2] in this conference which discusses the details of O2('z9) production and yield.…”