Isobaric Vapor–Liquid Equilibria of 1-Butanol–p-Xylene System

Abstract

Isobaric vapor-liquid equilibrium data were obtained for 1-butanol-p-xylene system at 97.3 kPa using a vapor recirculating type (modified Othmer's) equilibrium still. The activity coefficients were obtained by taking into consideration vapor-phase imperfections. The experimental data for this system were tested for thermodynamic consistency and were correlated by various equations. The system forms a minimum boiling azeotrope.

Vapor−Liquid Equilibrium Data for N-Methylacetamide and N,N-Dimethylacetamide with Cumene at 97.3 kPa

“…The nonrandomness parameter α 12 for the NRTL correlation equation was set equal to 0.33 for the N -methylacetamide + cumene system and 0.34 for the N , N -dimethylacetamide + cumene system. The estimation of parameters for the correlation equations is based on minimization of ln(γ 1 /γ 2 ) as an objective function using the nonlinear least-squares method of Nagahama, Suzuki, and Hirata as used by Rattan et al The correlation parameters τ 12 , τ 21 , and deviation in vapor phase composition for both systems are listed in Table . For the N -methylacetamide + cumene system, the NRTL correlation gives a root-mean-square deviation in the vapor-phase composition of 0.071.…”

Experimental Isobaric Vapor−Liquid Equilibrium Data for Binary Mixtures of Cyclic Ethers with (1-Methylethyl)benzene

“…The mixture nonrandomness parameter, α 12 , for the NRTL equation was set equal to 0.30 for both the systems. The estimation of parameters for the correlation equations is based on minimization of ln(γ 1 /γ 2 ) as an objective function using the nonlinear least-squares method of Nagahama, Suzuki, and Hirata as used by Rattan et al The correlation parameters A 1 , A 2 , and A 3 and deviation in vapor phase composition for both the systems are listed in Table . For the tetrahydrofuran + (1-methylethyl)benzene system, NRTL and Margules correlations give root-mean-square deviation in the vapor-phase composition as 0.05970 and 0.06072, respectively.…”

Isobaric Vapor–Liquid Equilibrium of Binary Mixtures of Vinyl Acetate and Ethyl Formate with Cumene at 97.3 kPa

“…The adjustable parameter R 12 for the NRTL correlation equation was set equal to 0.35 for the vinyl acetate + cumene system and 0.49 for the ethyl formate + cumene system. The estimation of parameters for the three correlation equations is based on minimization of ln(γ 1 /γ 2 ) as an objective function using the nonlinear least-squares method of Nagahama, Suzuki, and Hirata as used by Rattan et al 18 The correlation parameters A 1 , A 2 , and A 3 and deviation in vapor phase composition for both systems are listed in Table 5. For the vinyl acetate + cumene system, the root-mean-square deviation in the vapor-phase composition lies in the range 0.06490 to 0.06858, whereas for the ethyl formate + cumene system, it lies in the range 0.08013 to 0.08720.…”