Measurement of surface‐transfer coefficient values for CO₂ absorption in lime solutions in presence of surfactants

Abstract

A modified manometric apparatus has been used for the experimental determination of surface‐transfer coefficient values, used for the design calculations of various mass‐transfer equipments, for the absorption of carbon‐dioxide gas in saturated lime solution in presence of different types of surfactants. An analytical expression has been derived for estimation of the volume of gas absorbed, using the manometric data, for different times of absorption. The rate of gas absorption was found to remain constant initially for about 1 min and thereafter decreased with the progress of absorption time. Surface‐transfer coefficient values for gas absorption have been calculated using the experimental data of the volume of gas absorbed, without and with the addition of different concentrations of surfactants to the lime solutions. For a particular surfactant, surface‐transfer coefficient values were found to decrease with an increase in the concentration of surfactant in solution. The calculated values of the surface‐transfer coefficients for different surfactants are in close agreement with those reported in the literature.

Carbon dioxide deliming in leather production: a literature review

“…It was found initially at first minute the gas absorption rate was constant and thereafter decreased with time and the surface-transfer coefficient values decreased with increase of surfactant concentration. This could be explained by barrier mechanism that hydrophilic parts of surfactant array on the surface of lime solution and resist carbon dioxide molecules entering solution (Jana and Bhaskarwar, 2011). Mass transfer efficiency is also important in CDD.…”