基于LCA的环己烯法制己二酸的环境影响

Adipic acid, the core precursor of nylon 66 and polyurethane, is expected to reach $7.86 billion in 2032. Under the background of the "dual carbon" strategy, the cyclohexene method has become the mainstream process of global production enterprises through process innovation. Based on the framework of ISO 14040/44 standard, this study constructs a full life cycle assessment model covering "raw materials, manufacturing, and waste disposal". The openLCA 2.4 platform was used to integrate Ecoinvent 3.7 and CLCD databases to analyze the global warming potential (GWP100) and acidification potential (AP) of the cyclohexene method in multiple dimensions. Key findings: The environmental load of the cyclohexene process showed significant unit differences, in which the adipic acid production unit dominated 87.28% of the acidification potential (AP), 30% of the global warming potential (GWP100) and 81.73% of the eutrophication potential (EP) of the water body, mainly due to the large amount of NOx and high energy consumption generated by the oxidation of nitric acid. However, the nitric acid production unit showed a negative contribution to the acidification potential(AP) (-8.75E-01 kg SO? eq.), which was attributed to the optimized inhibition of acid by-product emissions by the platinum catalyst. The consumption of benzene raw materials in the production of cyclohexanol accounted for 71.1% of the fossil fuel potential (ADPf), while the waste disposal process of adipic acid unit contributed 92.9% of the total ADPf. In terms of ecotoxicity, the diacid by-products produced by the adipic acid unit lead to a marine ecotoxicity potential (MAETP) of up to 1.71E 06 kg 1,4-DB-eq. due to high water solubility. 65% of the human toxicity potential (HTP) is concentrated in nitric acid and adipic acid units, which mainly originate from the escape of liquid ammonia and the human respiratory damage caused by NOx emissions.