On the equilibrium between the solid phase and the gas phase of the systems hydrogen-nitrogen, hydrogen-carbon monoxide and hydrogen-nitrogen-carbon monoxide

Abstract

The equilibrium between the solid and gas phases has been studied, using the flow method. The pressure varied from 1.3 atm up to 50 atm. The composition of the gas phase has been determined by means of the solidification of N 2 (or CO) with the aid of liquid hydrogen. The most favourable conditions for the purification of hydrogen were deduced from the experimental results with respect to the binary mixtures H 2 -="2 and H 2 -CO . The agreement between theory and experiments proved to be satisfactory. The behaviour of the ternary mixture H 2 -N 2 -CO is shown in the corresponding diagrams.

All-dimensional H2–CO potential: Validation with fully quantum second virial coefficients

“…45 The solubility measurements of Dokoupil et al . 8 were analyzed by Reuss and Beenakker, 46 who derived B 12 at seven temperatures from 36 K to 60 K. The measurements of Verschoyle 7 were mostly at pressures too high for analysis at the second virial level to be appropriate, but we were able to derive three values at approximately 63 K and one value at approximately 58 K.…”

“…The few available vapor-liquid 4–6 and vapor-solid 7,8 equilibrium data are at cryogenic temperatures far from the conditions of most industrial interest. The available gas-phase data 9–15 will be discussed in Section IV C.…”

Interaction second virial coefficients from a recent H2–CO potential energy surface

“…Several sets of virial coefficient measurements for H 2 -CO are available. 12,13 The more recent ones are a very low temperature set ͑36-60 K͒ calculated by Reuss and Beenakker 14 from the solid-vapor equilibrium data of Dokoupil et al, 15 and a set between 77 and 296 K determined by Schramm et al 13 In this Note we describe the computation of these coefficients from the SAPT potential and compare them to the experimental data.…”

Fugacities in high‐pressure equilibria and in rate processes

“…Terms involving the third virial coefficient were neglected, and it was assumed that the solubility of hydrogen in solid carbon monoxide is negligible. * The results are shown in Figure 4 together with the experimental values reported by Dokoupil et al (10). If the vapor phase in this problem were considered ideal, the mole fraction of carbon dioxide would be approximately inversely proportional to the pressure.…”

“…Higher compression should therefore reduce the impurity concentration. Equation (10) however clearly shows that compression beyond the optimum pressure would actually increase rather than decrease the mole fraction of carbon monoxide in the vapor phase.…”