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Chemical Recycling of Aliphatic Polyamides by Microwave-Assisted Hydrolysis for Efficient Monomer Recovery
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-23 , DOI: 10.1021/acssuschemeng.0c05706 Urška Češarek 1 , David Pahovnik 1 , Ema Žagar 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-23 , DOI: 10.1021/acssuschemeng.0c05706 Urška Češarek 1 , David Pahovnik 1 , Ema Žagar 1
Affiliation
We report on a simple and efficient chemical recycling process for aliphatic polyamides (PA 66, PA 1010, PA 11, and PA 12), whereby PAs are converted exclusively into their constituent monomers even in the presence of reinforcement additives, such as carbon- and glass-fibers. In this process, the rate of PA hydrolysis reaction, performed under microwave irradiation in the presence of HCl as an acid catalyst, depends on the PA type, the HCl/amide mole ratio, and the type and amount of reinforcement additives. PA 66 is completely converted into the constituent monomers at 200 °C and a 1.25 HCl/amide mole ratio in 10 min. Long-chain PAs (PA 11, PA 12, and PA 1010) and PAs containing glass- or carbon-fiber reinforcement additives need at the same experimental conditions longer reaction times. Alternatively, they can be completely hydrolyzed at 200 °C within a comparable reaction time at a higher HCl/amide mole ratio of 2.5. Complete and straightforward conversion of PAs into the constituent monomers in the absence of side reactions simplifies the isolation and purification of monomers and reinforcement additives, which have been recovered in high yields and quality comparable to those of commercially available chemicals.
中文翻译:
微波辅助水解化学回收脂肪族聚酰胺以有效回收单体
我们报道了一种简单有效的脂族聚酰胺化学回收工艺(PA 66,PA 1010,PA 11和PA 12),其中即使存在增强添加剂(例如碳和氟橡胶),PA也只能单独转化为其组成单体玻璃纤维。在该方法中,在微波辐射下在作为酸催化剂的HCl存在下在微波辐射下进行的PA水解反应的速率取决于PA的类型,HCl /酰胺的摩尔比以及增强添加剂的类型和数量。PA 200在10分钟内于200°C和1.25 HCl /酰胺的摩尔比下完全转化为组成单体。长链PA(PA 11,PA 12和PA 1010)以及含有玻璃纤维或碳纤维增强添加剂的PA在相同的实验条件下需要更长的反应时间。或者,在较高的HCl /酰胺摩尔比为2.5的情况下,它们可以在可比的反应时间内在200°C的温度下完全水解。在不发生副反应的情况下,将PAs完全直接转化为组成单体可简化单体和增强添加剂的分离和纯化,这些单体和增强添加剂的回收率和质量可与市售化学品媲美。
更新日期:2020-11-02
中文翻译:
微波辅助水解化学回收脂肪族聚酰胺以有效回收单体
我们报道了一种简单有效的脂族聚酰胺化学回收工艺(PA 66,PA 1010,PA 11和PA 12),其中即使存在增强添加剂(例如碳和氟橡胶),PA也只能单独转化为其组成单体玻璃纤维。在该方法中,在微波辐射下在作为酸催化剂的HCl存在下在微波辐射下进行的PA水解反应的速率取决于PA的类型,HCl /酰胺的摩尔比以及增强添加剂的类型和数量。PA 200在10分钟内于200°C和1.25 HCl /酰胺的摩尔比下完全转化为组成单体。长链PA(PA 11,PA 12和PA 1010)以及含有玻璃纤维或碳纤维增强添加剂的PA在相同的实验条件下需要更长的反应时间。或者,在较高的HCl /酰胺摩尔比为2.5的情况下,它们可以在可比的反应时间内在200°C的温度下完全水解。在不发生副反应的情况下,将PAs完全直接转化为组成单体可简化单体和增强添加剂的分离和纯化,这些单体和增强添加剂的回收率和质量可与市售化学品媲美。