Abstract
Until recently, there was a substantial lack of reliable viscosity data for H2S, making the regression of an accurate H2S viscosity model significantly difficult. To derive a model for engineering applications (2008 H2S model), a corresponding states approach that related molecules of similar shape to H2S was applied to cover regions where no experimental data was available. Recently, new primary low-density experimental data and derived theoretical information have been published. Additionally, new high-pressure H2S viscosity measurements [at (373.15 and 423.15) K and up to 100 MPa] have also been reported. Based on this, a new revised correlation for the viscosity of H2S is presented in this work. The current correlation reproduces the primary H2S viscosity data to within experimental uncertainty. The precision of the new correlation varies from reference quality (better than +/- 0.20 %) at low-densities to an estimated +/- 5 % at 100 MPa and temperatures between (373 and 423) K. Outside this range of temperature there are no data to validate the accuracy of the model at elevated pressures; therefore we have conservatively estimated an uncertainty of roughly 10 % in the low-temperature and high-density region (T < 323 K up to 100 MPa) and 5 % for the high-temperature region ( T > 450 K up to 100 MPa).