Study of the Kinetic Hydrate Inhibitor Performance of a Series of Poly(N-alkyl-N-vinylacetamide)s

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• 作者：Hiroharu Ajiro ; Yukie Takemoto ; Mitsuru Akashi ; Pei Cheng Chua ; Malcolm A. Kelland
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：December 16, 2010
• 年：2010
• 卷：24
• 期：12
• 页码：6400-6410
• 全文大小：998K
• 年卷期：v.24,no.12(December 16, 2010)
• ISSN：1520-5029

文摘

Kinetic hydrate inhibitors (KHIs) have been used successfully for about the last 16 years to prevent gas hydrate formation mostly in gas and oilfield production lines. They work by delaying the nucleation and often also the growth of gas hydrate crystals for periods of time dependent mostly on the subcooling in the system. Poly(N-alkyl-N-vinylamide)s have been briefly investigated previously but no work has previously been published detailing a systematic study of structure versus performance. In this paper we report the KHI performance of a series of poly(N-alkyl-N-vinylacetamide)s polymers with alkyl side groups up to five carbon atoms. The study includes hydrate crystal growth tests on structure II tetrahydrofuran hydrate crystals as well as high pressure nucleation and crystal growth studies on a synthetic natural gas mixture giving structure II hydrates. The SII gas hydrate inhibition results correlate well with the THF hydrate crystal growth inhibition results since the polymers with the larger isopentyl or isobutyl groups performed best in both equipments but not significantly better than a commercial low molecular weight N-vinyl caprolactam−N-vinyl pyrrolidone 1:1 copolymer.