The modified Fischer-Tropsch synthesis (FTS) process is a promising technology for direct CO conversion into liquid fuels. However, the low yield of liquid fuels (below 29%) observed during CO-FTS process is still of great concern for commercial deployment. Therefore, new strategies are needed to improve both CO conversion and liquid fuel yield during CO-FTS process. A steady-state model based on first principles and a modified Anderson-Schulz-Flory (ASF) distribution was developed for the CO-FTS process to predict gasoline range hydrocarbons (C-C). The model was implemented in Aspen Plus® using Fortran® routines and model validation was performed for different H/CO feed ratios. Two process configurations (including a three-stage reactor in series and a single reactor with recycle) were considered for CO-FTS performance analysis and improvement through ex-situ water removal. Both CO-FTS process configurations showed significant improvements in CO conversion (from 34 to above 70%) with up to 61.0% gasoline yield. Though the single reactor with recycle achieved a higher CO conversion and gasoline production rate than the 3-stage reactor in series, the comparative analysis at the same CO conversion of 71.5% revealed that both process configurations have a similar process efficiency of roughly 66.4%.

中文翻译：

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将二氧化碳直接转化为汽油燃料的改良费托合成工艺的技术分析：通过异位除水提高性能


改良的费托合成（FTS）工艺是将二氧化碳直接转化为液体燃料的一项有前途的技术。然而，CO-FTS 过程中观察到的液体燃料收率低（低于 29%）仍然是商业部署的一个重要问题。因此，需要新的策略来提高 CO-FTS 过程中的 CO 转化率和液体燃料产量。为 CO-FTS 过程开发了基于第一原理和修正的 Anderson-Schulz-Flory (ASF) 分布的稳态模型，以预测汽油范围碳氢化合物 (C-C)。该模型使用 Fortran® 例程在 Aspen Plus® 中实施，并针对不同的 H/CO 进料比进行模型验证。考虑了两种工艺配置（包括串联的三级反应器和带循环的单反应器）进行 CO-FTS 性能分析和通过异位除水进行改进。两种 CO-FTS 工艺配置均显示 CO 转化率显着提高（从 34% 提高到 70% 以上），汽油收率高达 61.0%。尽管具有循环功能的单反应器比串联的三级反应器实现了更高的CO转化率和汽油产率，但在相同CO转化率71.5%的情况下的比较分析表明，两种工艺配置具有相似的工艺效率，大约为66.4%。