This work presents experimental results on the solubility of CO 2 in a new blend of diethanolamine (DEA) and trisodium phosphate (TSP) at temperatures ranging from (303.14 to 333.14) K and partial pressures from (10.133 to 20.265) kPa. Total concentrations of aqueous DEA + TSP blends were taken as (1.0, 1.5, and 2.0) mol 3 dm À3 . In a particular blend, the mole fraction of TSP was in the range 0.02 to 0.20. The results show that CO 2 solubility in a blend with a particular total concentration increases with increasing mole fraction of TSP at fixed temperature and partial pressure of CO 2 . The solubility of CO 2 in the blend decreases with increasing temperature but increases with increasing CO 2 partial pressure. The maximum CO 2 solubility in DEA + TSP blends was found to be 0.869 (mol of CO 2 ) 3 (mol of absorbent) À1 at 313.14 K, a total concentration of 2.0 mol 3 dm À3 , and a TSP mole fraction of 0.2. The experimental results of the present study are compared with those for other blends available in the literature.' EXPERIMENTAL SECTION Materials. All of the chemicals used were AR-grade. DEA with minimum purity 98 % (Sisco Research Laboratories Pvt. Ltd., Mumbai, India) was used to prepare amine blends. TSP with minimum purity 98 % (RFCL Ltd., New Delhi, India) was used without further purification. All solutions were prepared using deionized water. Two gas streams, one from a cylinder containing
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