A kinetic study of the simultaneous supercritical transesterification and partial hydrogenation (SSTPH) process using soybean oil with Pd/Al₂O₃ catalyst was conducted. In addition, process design and economic analysis were conducted to investigate the profitability of three different continuous biodiesel production processes, each with a production capacity of 40,000 tonnes/h, including a conventional supercritical process, SSTPH process using Cu catalyst, and SSTPH process using Pd/Al₂O₃ catalyst. The contents of methyl oleate in the biodiesel products from the three processes were 22.9, 56.9, and 77.9 wt%, respectively. It was found that the total manufacturing costs for the SSTPH processes were higher than that of the conventional supercritical process due to partial hydrogenation. However, the total capital investment for the SSTPH process with Pd/Al₂O₃ was the lowest owing to the mild reaction condition. Overall, the SSTPH process using Pd/Al₂O₃ was the most economically feasible. Sensitivity analysis of the net present values (NPVs) was conducted according to the material prices and the plant capacity. The results of the sensitivity analysis show that the NPVs for the three processes are most sensitive to the biodiesel price. Consequently, the SSTPH process with Pd/Al₂O₃ had the lowest break-even biodiesel price despite the same price of biodiesel.

对使用大豆油和 Pd/Al ₂ O ₃催化剂的同步超临界酯交换和部分加氢 (SSTPH) 工艺进行了动力学研究。此外，还进行了工艺设计和经济分析，以研究三种不同的连续生物柴油生产工艺的盈利能力，每种工艺的产能均为 40,000 吨/小时，包括传统的超临界工艺、使用铜催化剂的 SSTPH 工艺和使用 Pd 的 SSTPH 工艺/Al ₂ O ₃催化剂。三种工艺的生物柴油产品中油酸甲酯的含量分别为22.9、56.9和77.9wt%。发现由于部分氢化，SSTPH 工艺的总制造成本高于传统超临界工艺。然而，由于反应条件温和，采用 Pd/Al ₂ O ₃的 SSTPH 工艺的总资本投资最低。总体而言，使用 Pd/Al ₂ O ₃的 SSTPH 工艺是最经济可行的。根据材料价格和工厂产能对净现值 (NPV) 进行敏感性分析。敏感性分析的结果表明，三个过程的 NPV 对生物柴油价格最为敏感。因此，尽管生物柴油的价格相同，但使用 Pd/Al ₂ O ₃的 SSTPH 工艺的收支平衡生物柴油价格最低。