Abstract:Effect of gas-phase 2EH(2-ethyl-1-hexanol) additive amount on surface tension of LiBr (lithium bromide solution) and influences of gas-phase 2EH additive amount and solution flow rate on mass transfer coefficient during falling film absorption process were studied by setting up a test device for mass transfer performance of LiBr. The experimental results show that addition of gas-phase 2EH has a significant effect on surface tension and mass transfer coefficient of LiBr. Surface tension drops with increase of additive amount of gas-phase 2EH, but mass transfer coefficient rises with increase of additive amount of gas-phase 2EH. Adsorption of gas-phase 2EH molecules on solution surface reduces solution surface tension gradient and causes the Marangoni effect, which is an important cause for increase of convective mass transfer enhancement ratio.