Agglomeration–deposition of pyrolytic coke particles has been assigned as the main concern of fouling formation of olefin units in heat exchangers, vessels, and towers. The aim of this study is to investigate the agglomeration and the fouling propensity of aliphatic‐coated pyrolytic coke particles in the aqueous phase of quench water. Unusual surface properties of pyrolytic coke particles refer back to selective adsorption and formation of self‐assembled monolayers of long‐chain aliphatic hydrocarbons C₁₄–C₂₄ on the micropores of pyrolytic coke scaffold leading to formation of a thermal sensitive coating for agglomeration of suspended particles. Agglomeration of pyrolytic coke particles on solid surfaces was demonstrated using scanning electron microscopy (SEM) observations, and the morphology of fouling layer was studied. The experimental results revealed that the aliphatic coating, which encompasses about 40 wt% of the pyrolytic coke particles, is responsible for fouling propensity and particulate agglomeration of pyrolytic cokes in hot quench water. Thermal analysis as well as Fourier transform infrared spectroscopy (FT‐IR) and energy‐dispersive X‐ray spectroscopy (EDS) spectra showed that adsorbed layer of hydrocarbons follows a first‐order burning reaction and contains negligible amounts of heteroatoms, mainly aliphatic hydrocarbons.

中文翻译：

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热解焦炭颗粒在水相中的结垢倾向：热和光谱分析

热解焦炭颗粒的团聚沉积已被认为是换热器，容器和塔中烯烃单元结垢的主要考虑因素。这项研究的目的是研究在淬火水的水相中脂肪族包覆的热解焦炭颗粒的团聚和结垢倾向。热解焦炭颗粒的异常表面特性又回到了选择性吸附和长链脂肪烃C ₁₄ –C ₂₄自组装单分子层的形成在热解焦炭支架的微孔上形成了热敏涂层，用于悬浮颗粒的团聚。使用扫描电子显微镜（SEM）观察结果证明了热解焦炭颗粒在固体表面的团聚，并研究了结垢层的形态。实验结果表明，脂肪族涂料占热解焦炭颗粒的40％（重量），是热骤冷水中热解焦炭的结垢倾向和颗粒团聚的原因。热分析以及傅立叶变换红外光谱（FT-IR）和能量色散X射线光谱（EDS）光谱表明，碳氢化合物的吸附层遵循一级燃烧反应，并且杂原子的数量可忽略不计，主要是脂肪烃。