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<p>To address China’s growing dependence on imported crude oil and the rising demand for aromatic hydrocarbons, this study develops a novel co-aromatization strategy utilizing abundant C<sub>5</sub> alkanes as non-petroleum feedstocks for efficient BTX (benzene, toluene, xylene) production through catalytic conversion of <i>n</i>-pentane. Critically, we demonstrate that thermally coupling the endothermic aromatization of n-pentane with the exothermic aromatization of methanol enables exceptional process efficiency. Aspen Plus simulation results reveal that this integrated approach achieves near-complete conversion of <i>n</i>-pentane (100%) and high conversion of methanol (90%), while yielding BTX and by-products with outstanding recovery (99.89%) and purity (99.90%). Furthermore, systematic energy optimization via heat pump rectification, inter-feed heat exchange, and heat exchanger network design reduces overall system energy consumption by 7.55%. This work establishes a highly efficient and energy-conscious pathway for industrial-scale BTX production from non-traditional feedstocks, offering significant potential to alleviate petroleum dependency.</p>

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Energy-efficient co-aromatization of methanol and n-pentane via thermal coupling: process simulation and plant-scale optimization

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Yitong Chen,
  • Ruiqi Wang,
  • Limei Zhong,
  • Na Ma,
  • Dai Wei

摘要

To address China’s growing dependence on imported crude oil and the rising demand for aromatic hydrocarbons, this study develops a novel co-aromatization strategy utilizing abundant C5 alkanes as non-petroleum feedstocks for efficient BTX (benzene, toluene, xylene) production through catalytic conversion of n-pentane. Critically, we demonstrate that thermally coupling the endothermic aromatization of n-pentane with the exothermic aromatization of methanol enables exceptional process efficiency. Aspen Plus simulation results reveal that this integrated approach achieves near-complete conversion of n-pentane (100%) and high conversion of methanol (90%), while yielding BTX and by-products with outstanding recovery (99.89%) and purity (99.90%). Furthermore, systematic energy optimization via heat pump rectification, inter-feed heat exchange, and heat exchanger network design reduces overall system energy consumption by 7.55%. This work establishes a highly efficient and energy-conscious pathway for industrial-scale BTX production from non-traditional feedstocks, offering significant potential to alleviate petroleum dependency.