EXCESS MOLAR ENTHALPIES OF 9 BINARY STEAM MIXTURES - NEW AND CORRECTED VALUES

Heats of mixing of binary mixtures of steam +H2, +N2, +CO, +CO2, +CH4, +C2H4, +C2H6, +C3H8 and +C4H10 at temperatures up to 698.2 K and pressures up to 12 MPa have been reported In the literature. In some experiments, the gas flow rate was measured by condensing out the water, reducing the pressure of the gaseous component to atmospheric, and measuring the volumetric flow rate. Two corrections were overlooked In calculating the flow rate. Some gas remains dissolved in the water, and some gas is displaced from the flow system as water accumulates in the high-pressure receiver. While the dissolved gas correction is around 1%, the displacement correction Is around 10% at high pressures. Previously reported heats of mixing have been recalculated, and for 0.5H2O + 0.5H2 and 0.5H20 + 0.5N2 some new measurements are reported. © 1990, American Chemical Society. All rights reserved.