Phase equilibrium data for the binary system N, N-dimethylformamide + ethylene and + ethane at several temperatures up to 18 MPa

• Published in: Fluid phase equilibria Vol. 203; no. 1; pp. 295 - 307
• Main Authors: Duran-Valencia, C, Galicia-Luna, L.A, Richon, D
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2002; Elsevier Science
• Subjects: Chemistry; Equation-of-state; Ethane; Ethylene; Exact sciences and technology; General and physical chemistry; Liquid-liquid equilibria; Liquid-vapor equilibria; N, N-Dimethylformamide; Phase equilibria; Vapor–liquid equilibria; N, N-Dimethylformamide; Liquid–liquid equilibria; Vapor–liquid equilibria; Ethane; Equation-of-state; Ethylene; Isothermal condition; Equations of state; Hydrocarbon; N,N-Dimethylformamide; Binary system; Liquid vapor equilibrium; Carboxamide; Experimental study; Phase equilibrium; Liquid liquid equilibrium
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/S0378-3812(02)00202-9

The ethylene (C 2H 4)– N, N-dimethylformamide (DMF) binary system at 293.25, 303.05 and 323.05 K and pressures up to 18 MPa presents only a vapor–liquid equilibrium (VLE) behavior. The ethane (C 2H 6)– N, N-dimethylformamide binary system behaves quite differently. In fact this latter displays not only a vapor–liquid equilibrium (VLE) behavior but also liquid–liquid equilibrium (LLE) and vapor–liquid–liquid equilibrium (VLLE) behaviors. The ethane– N, N-dimethylformamide binary system has been studied at 264.45, 278.55, 293.15 and 313.35 K up to 18 MPa. Both systems are correlated using the Peng–Robinson equation-of-state with Wong–Sandler mixing rules. A stability test based on the tangent plan criterion, as described by Michelsen, is carried out during the flash calculations made on the ethane– N, N-dimethylformamide binary system.