Direct hydrogenation of carbon dioxide (CO₂) to formic acid is unfavorable thermodynamically, which makes its production limited. In this study, a thermodynamic analysis of CO₂ hydrogenation to binary product systems of methanol and formic acid promoted by ionic liquid (IL) (1-ethyl-2,3-dimethylimidazolium nitrite, ([Edmim][NO₂]) is presented. The analysis is conducted in Aspen Plus using the Gibbs energy minimization approach combined with a vapor–liquid equilibrium (VLE) for the solvation of CO₂ in IL. It is demonstrated that solvating CO₂ in ILs is an attractive alternative to overcome the thermodynamic difficulty associated with the product yield, especially formic acid. The [Edmim][NO₂] promoted system is very effective for the simultaneous production of formic acid and methanol at 25 °C and 17 bar with a yield of 35% formic acid and 30% methanol at a CO₂/H₂/IL ratio of 1/2/2. The results show a marked improvement in the yield of formic acid to other previously conducted studies on formic acid production.

将二氧化碳（CO ₂）直接氢化成甲酸在热力学上是不利的，这使其生产受到限制。在这项研究中，提出了由离子液体（IL）（1-乙基-2,3-二甲基咪唑鎓亚硝酸盐（[Edmim] [NO ₂ ]）促进的CO ₂加氢成甲醇和甲酸的二元产物体系的热力学分析。。该分析是在Aspen Plus中使用吉布斯能量最小化方法结合气液平衡（VLE）进行IL中的CO ₂溶剂化的结果，这表明在ILs中使CO ₂溶剂化是克服热力学的一种有吸引力的替代方法[Edmim] [NO ₂]促进体系对于在25°C和17 bar下同时生产甲酸和甲醇非常有效，CO ₂ / H ₂ / IL比为1/2/2时，甲酸和甲醇的收率分别为35％和30％。结果表明，相对于先前进行的其他有关甲酸生产的研究，甲酸的收率显着提高。