Abstract The results of tetraethylenepentamine polyalkylated amine oxides (TEPA-R-AO) and hyperbranched polyethyleneimine polyalkylated amine oxides (HPEI-R-AO) as kinetic inhibitors for methane hydrate are reported. Alkyl groups with 2 to 6 carbon atoms and different end-branchings (n-, iso- and tert-) were investigated. In slow constant cooling experiments, the best HPEI-R-AO derivatives outperformed the best TEPA-R-AO derivatives. The amine oxides with pentyl and hexyl groups gave better KHI performance than the butylated species. The best HPEI-R-AO with pentyl and hexyl groups gave such good results they were investigated further in long-term isothermal method at a subcooling degree of 11.3 °C. The HPEI-R-AO with 6 carbon atom alkyl groups gave the longest induction times. 2-butoxyethanol gave good synergy on the polymers with branched alkyl groups. The amine oxide functional group is a key feature because substitution with zwitterionic or cationic groups significantly decreased the performance whilst keeping the size of the alkylation groups constant.

中文翻译：

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烷基化聚胺氧化物对结构Ⅰ甲烷水合物的动力学抑制性能

摘要 报道了四亚乙基五胺聚烷基氧化胺 (TEPA-R-AO) 和超支化聚乙烯亚胺聚烷基氧化胺 (HPEI-R-AO) 作为甲烷水合物动力学抑制剂的结果。研究了具有 2 至 6 个碳原子和不同末端支化（n-、异-和叔-）的烷基。在慢速恒定冷却实验中，最好的 HPEI-R-AO 衍生物优于最好的 TEPA-R-AO 衍生物。具有戊基和己基的氧化胺比丁基化物质具有更好的 KHI 性能。最好的具有戊基和己基的 HPEI-R-AO 得到了如此好的结果，它们在 11.3 °C 过冷度下的长期等温方法中得到了进一步研究。具有 6 个碳原子烷基的 HPEI-R-AO 诱导时间最长。2-丁氧基乙醇对具有支链烷基的聚合物产生良好的协同作用。氧化胺官能团是一个关键特征，因为用两性离子或阳离子基团取代会显着降低性能，同时保持烷基化基团的大小不变。