Abstract
A static-analytic method was used to measure the H2S solubility in 50wt% MDEA and in presence of methane as a makeup gas. The solubility was measured at 7000kPa total pressure, and at 50 and 70°C, for H2S partial pressures from 31 to 974kPa. Measurements were also performed at 1500kPa total pressure and 50°C for H2S partial pressure span of 53–386kPa. The measured data were compared to predictions using the Extended UNIQUAC model. The experimental data showed that the total pressure has a significant effect on H2S solubility in aqueous MDEA. The observed effect is shown to be dominated by the non-ideality of the gas, and it could be predicted by the pressure effect on the fugacity coefficient of H2S in the gas phase. The experimental data from this work are compared and shown to be consistent with earlier published data.
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