Abstract：
A stable temperature site and the speed of heating the feedstocks play a key role in pyrolysis processes. In this study, the product distribution arising from pyrolysis of methyl ricinoleate (MR) at 550 °C with low and high heating rates was first studied by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results show that fast pyrolysis of MR favored the production of undecylenic acid methyl ester (UAME) and heptanal (HEP). Density functional theory (DFT) calculations were employed to reveal the UAME and HEP formation process from pyrolysis of MR. The bond dissociation energies (BDEs) of C-C bonds in MR showed that the C11-C12 bond is the weakest. This suggests that UAME and HEP are two major products. The process of slow and fast MR pyrolysis was the dehydration-first and the pyrolysis-first trend, respectively. The calculated activation energies of MR pyrolysis to UAME and HEP and MR dehydration to 9,12-octadecadienoic acid methyl ester were 287.72 and 238.29 kJ/mol, respectively. The much higher product yields obtained in the fast pyrolysis reactors than those from conventional tubular reactors confirmed the proposed process.
摘要：
稳定的温度位置和加热原料的速度在热解过程中起关键作用。在这项研究中,首先通过热解-气相色谱/质谱（Py-GC/MS）研究了蓖麻油酸甲酯（MR）在550°C下以低和高加热速率热解产生的产物分布。结果表明，MR的快速热解有利于生产十一碳烯酸甲酯（UAME）和庚醛（HEP）。采用密度泛函理论（DFT）计算来揭示MR热解的UAME和HEP形成过程。MR中C-C键的键离解能（BDE）表明C11-C12键最弱。这表明UAME和HEP是两个主要产品。缓慢和快速的MR热解过程是脱水优先和热解优先的趋势。分别。MR热解为UAME和HEP以及MR脱水为9,12-十八碳二烯酸甲酯的计算活化能分别为287.72和238.29kJ/mol，分别。在快速热解反应器中获得的产物产率比从常规管式反应器获得的产物产率高得多证实了所提出的方法。
