通过串联裂解-烷基化将聚烯烃低温提升为液态烷烃

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2023-02-23 DOI:10.1126/science.ade7485

Wei Zhang, Sungmin Kim, Lennart Wahl, Rachit Khare, Lillian Hale, Jianzhi Hu, Donald M. Camaioni, Oliver Y. Gutiérrez, Yue Liu, Johannes A. Lercher

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引用次数: 15

摘要

要以合理的高速度裂解碳-碳（C-C）键，需要相对较高的温度，这阻碍了聚烯烃废料的选择性升级再循环。我们提出了一种独特的方法，利用高离子反应环境来提高聚合物的反应活性并降低离子过渡态的能量。将聚合物 C-C 键的内热裂解反应与裂解产物的放热烷基化反应相结合，可在低于 100°C 的温度下将聚乙烯和聚丙烯完全转化为液态异构烷烃（C6 至 C10）。这两个反应都是由在氯铝酸盐离子液体中生成的路易斯酸性物质催化的。烷基化产物形成一个独立的相，很容易从反应物催化剂混合物中分离出来。该工艺可将未加工的消费后物品转化为高产率的优质液态烷烃。

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Low-temperature upcycling of polyolefins into liquid alkanes via tandem cracking-alkylation

Selective upcycling of polyolefin waste has been hampered by the relatively high temperatures that are required to cleave the carbon-carbon (C–C) bonds at reasonably high rates. We present a distinctive approach that uses a highly ionic reaction environment to increase the polymer reactivity and lower the energy of ionic transition states. Combining endothermic cleavage of the polymer C–C bonds with exothermic alkylation reactions of the cracking products enables full conversion of polyethylene and polypropylene to liquid isoalkanes (C₆ to C₁₀) at temperatures below 100°C. Both reactions are catalyzed by a Lewis acidic species that is generated in a chloroaluminate ionic liquid. The alkylate product forms a separate phase and is easily separated from the reactant catalyst mixture. The process can convert unprocessed postconsumer items to high-quality liquid alkanes with high yields.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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