In order to solve the problem of marine microplastics and realize the harmless resource utilization of plastics, the gasification experiments of polycarbonate (PC) microplastics were carried out in supercritical water and a novel seawater gasification of microplastic experiment was investigated. In this paper, the effects of different operating conditions (temperature, time, feedstock concentration, pressure) on gasification performance were discussed. The gasification kinetic of microplastics in supercritical water was calculated. The experimental results showed that the increase in gasification temperature and time enhanced the cracking reaction and free radical reaction of the microplastics to increase the gasification efficiency, while the reduction in feedstock concentration improved the gasification efficiency by increasing the gasification level of unit feedstock. The change in pressure had no significant effect on gasification due to the fact that the properties of the supercritical water were not significantly changed. It was found that the valuable results that all alkali metal salts in seawater promote hydrogen conversion, while in terms of carbon conversion, only KCl, CaCl₂, NaHCO₃ and seawater had a significant catalytic effect on the gasification. Seawater gasification of microplastics was a potential resource utilization method. Finally, it was considered that the PC plastic gasification conformed to the random nucleation and subsequent growth model (n = 3), and the reaction activation energy was 230.45 kJ/mol, which was smaller than that of traditional pyrolysis.

为了解决海洋微塑料的问题，实现塑料的无害化利用，在超临界水中进行了聚碳酸酯（PC）微塑料的气化实验，并研究了新型的海水微化实验。在本文中，讨论了不同操作条件（温度，时间，原料浓度，压力）对气化性能的影响。计算了超临界水中微塑料的气化动力学。实验结果表明，气化温度和时间的增加提高了微塑料的裂解反应和自由基反应，从而提高了气化效率，原料浓度的降低通过提高单位原料的气化水平提高了气化效率。由于超临界水的性质没有显着变化，因此压力变化对气化没有显着影响。发现有价值的结果是，海水中的所有碱金属盐都可以促进氢转化，而就碳转化而言，仅KCl，CaCl_{如图2所示}，NaHCO ₃和海水对气化具有明显的催化作用。微塑料的海水气化是一种潜在的资源利用方法。最后，认为PC塑料气化符合随机成核和后续生长模型（n = 3），反应活化能为230.45 kJ / mol，比传统的热解小。