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Non-Amide kinetic hydrate inhibitors : performance of a series of polymers of isopropenyloxazoline on structure II gas hydrates
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Reyes, Fernando T., Malins, Edward L., Becer, C. Remzi and Kelland, Malcolm A. (2013) Non-Amide kinetic hydrate inhibitors : performance of a series of polymers of isopropenyloxazoline on structure II gas hydrates. Energy & Fuels, Volume 27 (Number 6). pp. 3154-3160. doi:10.1021/ef400581c ISSN 0887-0624.
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Official URL: http://dx.doi.org/10.1021/ef400581c
Abstract
A series of polymers containing the 2-isopropenyl-2-oxazoline (iPOx) monomer have been synthesized by either anionic polymerization or RAFT polymerization. Both homopolymers of varying molecular weight were prepared as well as copolymers with methyl methacrylate (MMA) and N-isopropylmethacrylamide (NIPMAM) comonomers. The iPOx homopolymers were shown to be very poor Structure II tetrahydrofuran hydrate crystal growth inhibitors, indicating weak interaction of the oxazoline group with the hydrate crystal surface. They were also tested for their performance as kinetic hydrate inhibitors on a Structure-II-forming natural gas mixture. The homopolymers showed significant and increasing performance as the molecular weight decreased to 2000 Da. Copolymerization of iPOx with MMA did not improve the KHI performance, but copolymers of iPOx with NIPMAM did show an improvement, although not as good performance as polyNIPMAM homopolymer of similar molecular weight. However, using a 35:20 molar ratio iPOx:NIPMAM copolymer it is possible to obtain good KHI performance and a high cloud point of 70 °C in water, which is useful for injection into hot fluids. These results demonstrate that polymers containing predominantly non-amide-based monomers such as iPOx can be useful, high cloud point KHIs. In the case of iPOx polymers the primary inhibition mechanism appears to be nucleation inhibition since hydrate crystal growth inhibition is poor.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Energy & Fuels | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0887-0624 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 27 | ||||
Number: | Number 6 | ||||
Page Range: | pp. 3154-3160 | ||||
DOI: | 10.1021/ef400581c | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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