甲基二乙醇胺-环丁砜-水混合溶剂中CO_2和H_2S溶解度的关联与预测

CORRELATION AND PREDICTION OF SOLUBILITY OF CO_2 AND H_2S IN A MIXED METHYLDIETHANOLAMINE AND SULFOLANE AQUEOUS SOLUTION

采用简化的Clegg-Pitzer方程,关联了CO_2-MDEA-TMS-H_2O和H_2S-MDEA-TMS-H_2O体系的气液平衡数据。从二元、三元和四元体系气液平衡数据所获得的相互作用参数,无需增加调节参数,即可用于CO_2-H_2S-MDEA-TMS-H_2O五元体系气液平衡数据的预测。五元体系模型涉及三个中性溶剂(MDEA、TMS和H_2O)、两个中性溶质(CO_2和H_2S)和三种离子(MDEAH^+、HCO_3^-和HS^-)。

The Clegg-Pitzer equations with some simplifications are used to correlate the vapor-liquid equilibrium data for the CO_2-MDEA-TMS-H_2O and H_2S-MDEA-TMS-H_2O systems. The interaction parameters determined from data for the binary, ternary and quaternary systems can be used to predict the quinary mixed solvent system without any additional parameters. The model is applied to the CO_2-H_2S-MDEA-TMS-H_2O system containing three neutral solvents (MDEA, TMS and H_2O), two neutral solutes (CO_2 and H_2S) and three ionic species (MDEAH^+, HCO_3^- and HS^-) with three main chemical equilibria simultaneously involved.