ASPECTS OF MULTICOMPONENT MIXTURE SEPARATION IN THE PRESENCE OF SELECTIVE SOLVENTS

Abstract

The extractive and autoextractive distillation of ternary and quaternary azeotropic solvent mixtures was adopted to demonstrate the relation between the structure of phase diagram of the azeotropic systems and the operating parameters of the extractive distillation column based on the relative volatility criterion. A set of separation schemes belonging to different structural classes have been investigated. The separation scheme that has the lower energy consumption is revealed for separation of four-component solvent mixtures—acetone-n-butanol-chloroform (or toluene) and dimethylformamide—that were used in the production of thermal stabilizer stabilin-9.

Keywords:

• Energy consumption
• Extractive distillation
• Multicomponent mixture
• Relative volatility
• Separation scheme

Notes

N = 50 theoretical stages; F = 100 kmol/h.

All these data were calculated at the optimal operating parameters.