Equilibrium staged parametric pumping: Part III. Open systems at steady‐state‐McCabe‐Thiele diagrams

Abstract

The theory of equilibrium staged parametric pumps with discrete fluid transfers has been presented in previous papers for total reflux. Here, it is extended to open, fractionating systems, operating in cyclic steady state. The cases of and enriching section, a stripping section, and a complete fractionating apparatus are successively considered. Providing adequate variables are defined, the result is a diagram which plays the same role as the McCabe‐Thiele diagram in distillation. The optimal feed stage location, the minimum reflux, and the separation factor for given operating conditions are determined analytically and graphically in the case of linear equilibrium isotherms. The method is then generalized to non‐linear equilibria, particularly of constant relative volatility type.

Separation of Ethane from Natural Gas Using Porous ZIF-8/Water–Glycol Slurry

“…The above experimental results show that the highest separation selectivity could be achieved at 1 MPa and 273.15 K. Hence, a series of CH 4 + C 2 H 6 feed gas mixtures with different compositions ( z 2 ) were prepared and separation experiments were performed at 1 MPa and 273.15 K to simulate the separating circumstance of each column tray in the separation tower during the actual production process. The experimental data are illustrated in Table , which can be used to construct adapted McCabe–Thiele trends, as it is known from the established literature, , and the pseudo P – T – x – y phase diagram is plotted in Figure . By using the adapted McCabe–Thiele trends, it is possible to estimate the minimum theoretical stage numbers required to separate a CH 4 + C 2 H 6 mixture gas in a separation tower.…”