Vapor−Liquid Equilibrium for Binary Systems of Carbon Dioxide + Methanol, Hydrogen + Methanol, and Hydrogen + Carbon Dioxide at High Pressures

Abstract

Vapor-liquid equilibrium data and density of the liquid phase for binary systems of carbon dioxide + methanol, hydrogen + methanol, and carbon dioxide + hydrogen at high pressures were determined. A dynamic technique with liquid-phase recirculation and on-line gas chromatography was used in this study. The equilibrium data and density were measured at temperatures between 278.15 K and 308.15 K, and pressures between 15 bar and 192.53 bar. The isothermal volume expansion behavior for the carbon dioxide + methanol system at various temperatures was also determined.

Phase behavior of (CO2+H2) and (CO2+N2) at temperatures between (218.15 and 303.15)K at pressures up to 15MPa

“…In comparison with the literature [3][4][5][6][7], there is generally good agreement at low temperatures in the liquid phase (see Figs 9a and 9c) with the exception of the results of Tsang and Streett [6] which deviate systematically from the other data in both phases. At temperatures above 275 K the data of Bezanehtak et al [7] follow those Tsang and Street [6], while the data of Spano et al [4] and Kaminishi and Toriumi [3] agree with our results.…”

“…The VLE region in the (CO2 + H2) system is bounded at low pressures by the vaporpressure curve of CO2, at high temperatures and pressures by the critical locus of the binary system and at low temperatures and high-pressures by the solid-vapor-liquid three-phase line. Different parts of this region have been studied by several authors [3][4][5][6][7]. Kaminishi and Toriumi [3] appear to have been the first workers to study this system and their measurements were made along five isotherms at temperatures between (233.15 and 298.15) K with pressures up to 20 MPa.…”

“…They also studied the three phase SVLE curve at pressures between (36 and 161) MPa and estimated the point at which it meets the VLE critical locus: T = 235 K and p = 198 MPa. Finally, Bezanehtak et al [7] measured VLE along three isotherms at temperatures from (278.15 to 298.15) K with pressures up to 19 MPa using a quasi-static analytic apparatus with liquid-phase re-circulation and on-line analysis by GC. As discussed below when we compare our results with the literature, there are quite significant differences between the reported data for the (CO2 + H2) system.…”

One-pot catalytic hydrocracking of raw woody biomass into chemicals over supported carbide catalysts: simultaneous conversion of cellulose, hemicellulose and lignin

“…The enhancement of phenols yields is presumably due to the increased solubility of birch lignin in methanol and EG. 29 In addition, higher hydrogen solubility in small molecular alcohol 30,31 than in water may also be helpful for the hydrogenolysis of phenolic ether linkages. a Unless otherwise specified, the reactions were conducted at 235 C and 6 MPa H 2 for 4 h. Feedstock (1.0 g), catalyst (0.4 g), and water (100 mL) were put into a 300 mL stainless-steel autoclave.…”

PVTxy properties of CO2 mixtures relevant for CO2 capture, transport and storage: Review of available experimental data and theoretical models

“…9(a)). There is no good agreement among the three available data sources [31,44,59], except the data of Bezhanetak [59] and According to the origin, equations of state may be classified into several families. The van der Waals family of cubic equations and the family of extended virial equations are examples.…”