Surface tension of ethane–methane solutions: 1. Experiment and thermodynamic analysis of the results

• The capillary constant of C2H6–CH4 mixture has been measured from 93.15 to 283.15 K.
• The surface tension σ has been calculated.
• Obtained data have been approximated by analytical dependences.
• In the framework of models of an ideal and a regular solution σ has been calculated.

The paper presents the results of measuring the capillary constant a2 and calculating the surface tension σ of ethane–methane solutions. Experimental data have been obtained in the temperature range from 93.15 to 283.15 K at pressures from that of saturated vapors of pure ethane to 4 MPa. Equations that approximate the temperature, pressure and concentration dependences of a2 and σ are suggested. The concentration dependence of the surface tension is described in the framework of models of an ideal and a regular solution. The relative adsorption has been calculated.

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