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<p>The separation of methanol-carbon tetrachloride azeotropes presents significant challenges. Three strategies were evaluated: extractive distillation (ED) with p-cresol as the optimal entrainer, pressure-swing distillation (PSD) at 0.4/5&#xa0;atm, and azeotropic distillation (AD) using water. The separation sequence and operating parameters are optimized via different sequential iterative procedures, aiming to minimize the total annual cost (TAC). Two energy-saving technologies, namely heat-pump technology and heat-integration technology, were evaluated. The comprehensive economic and environmental assessment showed that the heat-pump AD process was optimal, with TAC reduced by 67.6% compared to ED and by 53.2% compared to PSD, and CO₂ emissions reduced by 49.0% compared to ED and by 41.7% compared to PSD.</p>

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Separation of Methanol-Carbon Tetrachloride Azeotropes: Process Optimization and Comparative Assessment of Energy-Efficient Strategies

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Chuanwu Hu,
  • Jiemei Yu,
  • Chao Sun,
  • Zhankun Jiang,
  • Meilong Yuan,
  • Chao Hua

摘要

The separation of methanol-carbon tetrachloride azeotropes presents significant challenges. Three strategies were evaluated: extractive distillation (ED) with p-cresol as the optimal entrainer, pressure-swing distillation (PSD) at 0.4/5 atm, and azeotropic distillation (AD) using water. The separation sequence and operating parameters are optimized via different sequential iterative procedures, aiming to minimize the total annual cost (TAC). Two energy-saving technologies, namely heat-pump technology and heat-integration technology, were evaluated. The comprehensive economic and environmental assessment showed that the heat-pump AD process was optimal, with TAC reduced by 67.6% compared to ED and by 53.2% compared to PSD, and CO₂ emissions reduced by 49.0% compared to ED and by 41.7% compared to PSD.