In recent years, we have explored non-amide-based classes of kinetic hydrate inhibitor (KHI) polymers to determine if the same level of performance can be achieved as commercial KHI polymers, which all contain amide groups. Here, we have investigated a series of polyvinylaminals as KHIs for the first time. These polymers with pendant alkyl or cycloalkyl groups of varying sizes and shapes were synthesized in a simple one-step procedure from polyvinylamine. Their performance as tetrahydrofuran (THF) hydrate crystal growth inhibitors and as high-pressure KHIs was studied with a structure II-forming natural gas mixture in both sapphire and steel rocking cells. A structure–performance analysis was carried out. The best KHI was obtained with a polyvinylaminal with pendant cyclohexyl groups and gave a similar performance to the well-known KHI poly(N-vinyl caprolactam) and without the disadvantage of a low cloud point.

中文翻译：

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高浊点聚乙烯吡咯烷酮作为非酰胺基动气水合物抑制剂

近年来，我们已经探索了非酰胺类动力学水合物抑制剂（KHI）聚合物，以确定是否可以实现与均包含酰胺基团的商品KHI聚合物相同的性能水平。在这里，我们首次研究了一系列聚乙烯基缩醛作为KHI。这些具有不同大小和形状的烷基或环烷基侧基的聚合物是通过简单的一步法由聚乙烯胺合成的。在蓝宝石和钢制摇摆室中，使用形成结构II的天然气混合物研究了它们作为四氢呋喃（THF）水合物晶体生长抑制剂和高压KHI的性能。进行了结构性能分析。最佳的KHI是通过带有环己基侧基的聚乙烯基缩醛获得的，其性能与众所周知的KHI聚（N-乙烯基己内酰胺），并且没有低浊点的缺点。