Polyamine-promoted aqueous DEEA for CO2 capture: An experimental analysis

摘要

An enormous increase in global energy demand has resulted in the increasing emissions of Carbon dioxide (CO 2 ) throughout the globe, and hence, the refinement of established technologies for the capture of CO 2 is of global interest. Currently, the absorption performed with chemical solvents, particularly alkanolamines and their blends, represents the most practical option. In general, the enhancement in absorption and regeneration capacities is targeted via the blending of several alkanolamines consisting of different functionalities to seek the absorption-favoured properties of individual amines. The present work considers blending of a tertiary alkanolamine, N,N-diethylethanolamine (DEEA) with a polyamine, triethylenetetramine (TETA). This blend has been envisaged to combine the high absorption capacity of TETA with high regeneration capacity of DEEA. The concentration of? DEEA and TETA in the blends is varied between 2.5-2.95 M and 0.05-0.5 M, respectively. The performance of these blends has been evaluated using an indigenous wetted-wall contactor. The CO 2 partial pressure was varied between 5-15 kPa and its effect on the CO 2 loading capacity and absorption flux for different compositions is evaluated in the temperature range of 30-50 . It is found that increasing the concentration of TETA increases the absorption drastically. Besides, the physical properties (density and viscosity) of these solvent systems have also been estimated.