Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Cosolvent Selection for Benzene-Cyclohexane Separation in Extractive Distillation

Yin, W.[Wang], Ding, S.[Shaohua], Xia, S.[Shuqian], Ma, P.[Peisheng], Huang, X.[Xiaojuan], Zhu, Z.[Zhansheng]
J. Chem. Eng. Data 2010, 55, 9, 3274-3277
ABSTRACT
The Krupp-Koppers (K-K) extractive distillation method with N-formylmorpholine (NFM) as the solvent is one of the most important processes for catalytic hydrogen refining of rude benzene. To increase the capacity and selectivity of the solvent and decrease the ratio of solvent to feed in this process, ethylene glycol (EG), N,N-dimethylformamide (DMF), and N-methylpyrrolidone (NMP) were introduced as the cosolvent with NFM. The relative volatility of cyclohexane to benzene (a) at a certain Rstf (liquid-phase ratio of solvent to feed) was considered as a criterion of the performance of cosolvent. The vapor-liquid equilibrium (VLE) data for benzene + NFM, EG + NFM, benzene + cyclohexane + NFM, benzene + cyclohexane + NFM + EG, benzene + cyclohexane + NFM + DMF, and benzene + cyclohexane + NFM + NMP were measured at atmospheric pressure. VLE data of benzene + NFM, EG + NFM, benzene + cyclohexane + NFM, and benzene + cyclohexane + NFM + EG were calculated by the nonrandom two-liquid (NRTL) model. The average temperature deviations of benzene + cyclohexane + NFM and benzene + cyclohexane + NFM + EG systems are (1.40 and 3.19) K, respectively. The average deviations of the vapor-phase mole fraction of benzene are 0.030 and 0.066, respectively.
Compounds
# Formula Name
1 C5H9NO2 N-formylmorpholine
2 C6H6 benzene
3 C6H12 cyclohexane
4 C2H6O2 1,2-ethanediol
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Vapor or sublimation pressure, kPa ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • EBULLIO:UFactor:8
  • 1
  • POMD
  • 4
  • Vapor or sublimation pressure, kPa ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • EBULLIO:UFactor:8
  • 1
  • POMD
  • 2
  • 1
  • Boiling temperature at pressure P, K ; Liquid
  • Mole fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • EBULLIO:UFactor:8
  • 10
  • POMD
  • 2
  • 1
  • Mole fraction - 2 ; Gas
  • Mole fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Gas
  • Liquid
  • CHROM:UFactor:16
  • 10
  • POMD
  • 4
  • 1
  • Boiling temperature at pressure P, K ; Liquid
  • Mole fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • EBULLIO:UFactor:8
  • 18
  • POMD
  • 4
  • 1
  • Mole fraction - 4 ; Gas
  • Mole fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Gas
  • Liquid
  • CHROM:UFactor:8
  • 18
  • POMD
  • 2
  • 3
  • Boiling temperature at pressure P, K ; Liquid
  • Mole fraction - 3; Gas
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • CHROM::UFactor:8
  • 1
  • POMD
  • 2
  • 3
  • 1
  • Mole fraction - 3 ; Liquid
  • Mole fraction - 3 ; Gas
  • Mole fraction - 2 ; Gas
  • Temperature, K; Liquid
  • Mole fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • 10