We have investigated the solubility of methanethiol and ethanethiol (methyl and ethyl mercaptans in an aqueous methyldiethanolamine solution (25 wt %)) by using a static analytic method at 333 and 365 K. The measurements were done for different pressures of methane in the absence of acid gas with individual acid gas present and with a mixture of acid gases present (CO2 and/or H2S). Additional measurements of Henry's law constants were realized by considering the gas stripping method. The effect of total pressure (realized by the addition of methane) and the effect of acid gas loading for a constant total pressure around 7 MPa were studied. The increasing pressure and acid gas loading increase the apparent Henry's law constant of the mercaptan, highlighting a drop out effect of the mercaptans.

In this work, new isothermal experimental data of vapor-liquid equilibrium of the isobutane and ethyl mercaptan binary system are presented. The pressure and temperature conditions are up to 1 MPa and between 298 and 343K. The experimental apparatus is based on a “static-analytic method” specially developed for low-pressure measurements. Two online capillary samplers are used to take vapor and liquid samples that are analyzed with a gas chromatograph. The classical Peng Robinson Equation of State is used to correlate the experimental data. The van Ness test is used to check the consistency of the data. The measured data are also compared to predicted values from two predictive models, and a good agreement is found between the PSRK UNIFAC and the PPR78 models and the experimental measurements.

Performances of systems using refrigerants are highly dependent on the selection of the working fluids. In order to guide this choice, the thermophysical properties of these fluids need to be correctly correlated. Experimental data are required for models to work; The knowledge of thermophysical properties of working fluids is required for designing ORC and High Pump (HP) systems. Isothermal vapor-liquid equilibrium (VLE) data for the HFO-1336mzz(E) (trans-1,1,1,4,4,4-hexafluoro-2-butene) binary mixture with HFC-290 (Propane), HFC-134a (1,1,1,2-tetrafluoroethane), HFC-152a (1,1-difluoroethane), HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) and HFO-1234ze(E) (trans-1,3,3,3-tetrafluoropropene) were measured at 313 K, 333 K and 353 K. The experimental technique used is based on static analytic methods. All of the data (P-x-y) were well correlated with the Peng-Robinson equation of state, associated with a Mathias-Copeman alpha function and classical mixing rules. The results of such modeling are in good agreement with the measured data. (C) 2020 Elsevier Ltd and IIR. All rights reserved.

Design of debutaniser in fractionation train in gas processing requires accurate knowledge of phase equilibrium properties of n-butane with sulphur compounds like mercaptan. In this paper, we report high-quality isothermal vapour-liquid equilibrium data for n-butane + ethyl mercaptan (or ethanethiol) between 298.14 K and 388.18 K and pressures up to 2.0029 MPa. An equipment whose experimental technique is based on static-analytic method was considered. The equipment is composed by an agitated equilibrium cell with two online micro samplers connected to a Gas Chromatograph. The data was correlated with the Peng Robinson equation of state with classical alpha function. A comparison was also performed with two predictive models, PPR78 and PSRK UNIFAC. (C) 2019 Elsevier B.V. All rights reserved.

Air contains impurities, which must be removed before its transformation and utilization. In the present work, new isothermal vapor–liquid equilibrium (VLE) data are reported for three binary systems containing NO with (CO, N2, or Ar) at different temperatures (between 105 and 146 K) and pressures up to 4 MPa. The compositions of the coexisting phases were experimentally determined using an apparatus based on the “static-analytic” method. The Peng–Robinson equation of state combined with different mixing rules (classical, Wong–Sandler, and Huron–Vidal) were used to represent the phase diagram (P, x, y).

Within the fight against global warming and the reduction of greenhouse-gases emission, research has been particularly intense over the last years to develop efficient processes of carbon dioxide captures. Indeed, along with carbon dioxide and water, a great number of compounds such as O2, N2, Ar, SOx, NOx, H2 and CO can be present at different levels of concentration. The objective of this communication is to provide new sets of data to characterize phase equilibrium of these systems for the development of geological storage technologies. So, Isothermal vapour-liquid equilibrium data are reported for the following systems (SO2-O2-N2 and CO2-O2- H2O). The pressure and temperature ranges for this study are 6-18MPa and 323-373K, respectively. All measurements were carried out using an apparatus based on the “static-analytic” method.