CO气相偶联制草酸为多步反应循环系统。在评选出最佳催化剂及理论研究的基础上，利用模拟计算、催化剂工程研究和模试运转对CO气相偶联合成草酸二乙酯的工程问题进行了研究，解决了偶联反应和再生反应速率匹配的关键技术。在反应动力学和反应参数敏感性分析的基础上，经模试1000小时连续运转，解决了复杂反应的非线性多步循环的速率匹配，并建立了零排放洁净工艺过程；研制的催化剂适用于CO偶联反应工业放大工程，为工业生产提供了一条绿色化学工艺路线。

The synthesis of oxalic acid by CO coupling reaction in gaseous phase is a circulating system with multi-step reactions. The best catalyst was prepared and the reaction mechanism was proposed in the past work. It was found that the key problem for scaling-up this process is to match the CO coupling reaction rate with the regeneration rate. In this thesis, these two reactions were simulated by analyzing the sensitivity of operating parameters based on the acquired reaction kinetics. It was proposed that the match of these two reactions is a complex non-linear process. The key technique was investigated during the scale-up experiments of catalyst preparation and CO coupling reaction. By analyzing the simulation and experimental results, the key problem for the match of CO coupling with regeneration reaction was resolved. The scale-up circulating system for oxalic production was continuously run for 1000 hours and no intermediates was vented. It was proved that the match of these two reactions was achieved and an environmentally benign process for oxalic acid production has been set-up after a series of study. It provides a new technology for industrial production of oxalic acid.