Development of advanced solvent system for post combustion CO2 capture

Abstract

newlineAbsorption of CO2 by alkanolamine solvents is the most commonly and commercially applied CO2 capture process due to its distinct advantages over other processes and solvents. newlineAqueous solutions of two polyamines, e, g., tris 2 aminoethyl amine, TAEA and triethylenetetramine TETA, were selected to capitalize the multi amine functionality to increase the absorption capacity as well as high rate of absorption due to the presence of many primary amine groups. The cyclic loadings of TAEA and TETA were found to be significantly higher than that of other well known conventional amines. To improve the regeneration characteristic of the polyamines they were blended with tertiary solvents. Tertiary solvents e, g.,2 diethylaminoethanol DEAE and 1dimethylamino 2 propanol DMAP, for blending are selected through rigorous screening among others based on cyclic capacity. The capacity and specific rates of absorption of CO2 were measured into aqueous blends of TETA and DEAE, TAEA and DEAE, TETA and DMAP and TAEA and DMAP at range of temperature 303 to 323 K. Finally, the blend of DEAE and TETA is found the best among the blends studied. newline newlineFurther in this study, chitosan-based biopolymer was synthesized as advanced solvent system for CO2 capture. Water soluble o carboxymethyl chitosan with a degree of substation 1.23 was synthesized by the reaction of chitosan with monochloroacetic acid to utilized for the first time in CO2 absorption. The CO2 absorption capacity and regeneration were measured in the newly developed solvent and the results were compared with three conventionally used amines as 2 amino 2 methyl 1 propanol AMP and monoethanolamine MEA and N methyl diethanolamine MDEA. newline newlineBesides the work mentioned above, highly efficient and cost effective approach was made for efficient capturing of CO2 with three different kinds of amino acid histidine, aspartic acid and glutamic acid derived ionic liquids and its simultaneous conversion to cyclic carbonates using histidine amino acid derived ionic liquid at atmospheric pressure