Absorption of Carbon Dioxide by the Aqueous Solution of KOH in Pipe Reactor

Abstract

Absorption of CO2 was carried out with the mixed phase flow of CO2-air mixture gas and KOH solution in vertical glass pipes of 12.8mm and 17.8mm i.d.The K2CO3 concentrations in the flowing solution were measured at various points along the pipe. This reator was, for convenience' sake, considered separately in two sections as divided according to the concentration gradients: one was the accelerating section where the concentration gradient was curved by the mixing effect, and the other was the steady flow section where the gradient was nearly linear.Mass transfer coefficients were calculated by the next equation:The effects of various factors on KGa were investigated in each flow section as follows: -1) for the accelerating section (0.17m)2) for the steady flow section3) for the whole section (1.26m)4) KGa was inversely proportional to the pipe diameter.5) KGa was increased with the KOH concentration within the Experimental range. (0.8-2.03 N KOH)