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<p>This study evaluates, via Aspen Plus simulation, the feasibility of an advanced separation process for the high-purity recovery (99.99%) of isobutanol from its heterogeneous azeotropic mixture with water. The work combines thermodynamic modeling based on binary interaction parameters regressed from experimental vapor–liquid equilibrium data, rigorous parametric analysis, and a systematic comparison of process schemes. Two configurations were evaluated: a single distillation column followed by a decanter, and a more complex two-column, two-decanter system. The parametric study made it possible to define the optimal operating conditions, showing that a decanter temperature close to the azeotrope boiling point (≈ 362.31&#xa0;K) maximizes the purity of the aqueous phase (≈ 96.6%). The results demonstrate the unequivocal superiority of the two-stage configuration. For a lean feed (20&#xa0;mol% isobutanol), it achieves a recovery yield of 54%, compared to 0% for the simple scheme. Overall yields reach 77.1% and 90.3% for feeds of 50 and 70&#xa0;mol% isobutanol, respectively, with concurrent improvements in water recovery (to 96.6%) and processed throughput. However, these performance gains are accompanied by a significant increase in energy demand, which peaks for feed compositions nearest the azeotropic point. This quantitative analysis establishes the two-column, two-decanter process as technically indispensable for achieving global, high-purity recovery, while clearly delineating the critical trade-off between separation efficiency and energy demand.</p>

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Comparative analysis of distillation–decantation schemes for isobutanol–water azeotropic separation: performance, energy efficiency, and VLE regression

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Badra Mahida,
  • Khadidja Benyahia,
  • Amina Belmokhtar,
  • Siham Berriah,
  • Ikram Khelifa

摘要

This study evaluates, via Aspen Plus simulation, the feasibility of an advanced separation process for the high-purity recovery (99.99%) of isobutanol from its heterogeneous azeotropic mixture with water. The work combines thermodynamic modeling based on binary interaction parameters regressed from experimental vapor–liquid equilibrium data, rigorous parametric analysis, and a systematic comparison of process schemes. Two configurations were evaluated: a single distillation column followed by a decanter, and a more complex two-column, two-decanter system. The parametric study made it possible to define the optimal operating conditions, showing that a decanter temperature close to the azeotrope boiling point (≈ 362.31 K) maximizes the purity of the aqueous phase (≈ 96.6%). The results demonstrate the unequivocal superiority of the two-stage configuration. For a lean feed (20 mol% isobutanol), it achieves a recovery yield of 54%, compared to 0% for the simple scheme. Overall yields reach 77.1% and 90.3% for feeds of 50 and 70 mol% isobutanol, respectively, with concurrent improvements in water recovery (to 96.6%) and processed throughput. However, these performance gains are accompanied by a significant increase in energy demand, which peaks for feed compositions nearest the azeotropic point. This quantitative analysis establishes the two-column, two-decanter process as technically indispensable for achieving global, high-purity recovery, while clearly delineating the critical trade-off between separation efficiency and energy demand.