Electrohydrodimerization of acrylonitrile (AN) to adiponitrile (ADN) is considered to be one of the largest and most successful electrochemical processes. The reutilization of electrolytes and the ease of removal of ADN from the electrolyte have emerged as critical challenges in this process. However, the current methods to recover the electrolyte and remove ADN are very costly in terms of both energy consumption and equipment cost. In the current work, a novel heterogeneous extraction method was proposed to separate ADN from the electrolyte using benzene or carbon tetrachloride (CTC) as the solvent. In addition, the nondominated sorting genetic algorithm (NSGA-III) was employed to optimize process parameters with respect to economy, environment, and safety. Results indicate that compared to traditional distillation separation, heterogeneous extraction using benzene and carbon tetrachloride decreased by 9.59 and 27.19% in terms of the total annual cost (TAC), respectively, while CO₂ emission was reduced by 82.82 and 83.55%, and exergy efficiency was enhanced by 13.94 and 26.94%, while the safety index closely correlates with the selected solvents. This new heterogeneous extraction method opens possibilities for an efficient and sustainable design for recycling diverse electrolytes.

中文翻译：

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己二腈电解液回收的新型多相萃取方法


丙烯腈（AN）电加氢二聚为己二腈（ADN）被认为是最大和最成功的电化学过程之一。电解质的再利用和从电解质中轻松去除 ADN 已成为该过程中的关键挑战。然而，目前回收电解质和去除ADN的方法在能源消耗和设备成本方面都非常昂贵。在目前的工作中，提出了一种新颖的非均相萃取方法，使用苯或四氯化碳（CTC）作为溶剂从电解液中分离ADN。此外，采用非支配排序遗传算法（NSGA-III）来优化经济、环境和安全方面的工艺参数。结果表明，与传统精馏分离相比，苯和四氯化碳非均相萃取的年度总成本（TAC）分别降低了9.59%和27.19%，CO ₂ 排放量降低了82.82%和27.19%。 83.55%，火用效率分别提高13.94和26.94%，而安全指数与所选溶剂密切相关。这种新的异质提取方法为回收不同电解质的高效且可持续的设计提供了可能性。