Temperature–Pressure Swing Process for Reactive Carbon Capture and Conversion to Methanol: Techno-Economic Analysis and Life Cycle Assessment,Environmental Science & Technology

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Temperature–Pressure Swing Process for Reactive Carbon Capture and Conversion to Methanol: Techno-Economic Analysis and Life Cycle Assessment
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-24 , DOI: 10.1021/acs.est.4c02589
Jonathan A Martin ₁ , Eric C D Tan ₁ , Daniel A Ruddy ₁ , Jennifer King ₁ , Anh T To ₁

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A model was developed to conduct techno-economic analysis (TEA) and life cycle assessment (LCA) for reactive carbon capture (RCC) and conversion of carbon dioxide (CO₂) to methanol. This RCC process is compared to a baseline commercialized flue gas CO₂ hydrogenation process. An ASPEN model was combined with existing TEA and LCA models into a larger TEA/LCA framework in Python. From preliminary experimental data, the model found a levelized cost of $0.79/kg methanol for the baseline process and $0.99/kg for the RCC process. The cradle-to-gate carbon intensity of the baseline process was 0.50 kg-CO₂e/kg-methanol, compared to 0.55 kg-CO₂e/kg-methanol for the RCC process. However, water consumption for RCC (10.21 kg-H₂O/kg-methanol) is greatly reduced compared to the baseline (12.89 kg-H₂O/kg-methanol). Future improvements in hydrogen electrolysis costs will benefit the RCC. A target H₂/methanol mass ratio of 0.26 was developed for RCC laboratory experiments to reduce methanol cost below the baseline. If a ratio of 0.24 can be achieved, a levelized cost of $0.76/kg methanol is projected, with a carbon intensity of 0.42 kg-CO₂e/kg-methanol.

中文翻译：

活性碳捕获和甲醇转化的温度-压力摆动过程：技术经济分析和生命周期评估

开发了一个模型来对反应性碳捕获（RCC）和二氧化碳（CO ₂ ）转化为甲醇进行技术经济分析（TEA）和生命周期评估（LCA）。该 RCC 工艺与基准商业化烟道气 CO ₂加氢工艺进行了比较。 ASPEN 模型与现有的 TEA 和 LCA 模型组合成 Python 中更大的 TEA/LCA 框架。根据初步实验数据，该模型发现基准工艺的甲醇平均成本为 0.79 美元/千克，RCC 工艺的平均成本为 0.99 美元/千克。基线工艺的从摇篮到大门的碳强度为 0.50 kg-CO ₂ e/kg-甲醇，而 RCC 工艺的碳强度为 0.55 kg-CO ₂ e/kg-甲醇。然而，与基线（12.89 kg-H ₂ O/kg-甲醇）相比，RCC的水消耗量（10.21 kg-H ₂ O/kg-甲醇）大大减少。未来氢电解成本的改善将使 RCC 受益。为 RCC 实验室实验制定了 0.26 的目标 H ₂ /甲醇质量比，以将甲醇成本降低到基线以下。如果能够达到 0.24 的比率，预计平均成本为 0.76 美元/kg 甲醇，碳强度为 0.42 kg-CO ₂ e/kg-甲醇。

更新日期：2024-07-24

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