The anti-agglomerating hydrate behavior observed for some crude oils has previously been
related to crude oil composition and to surface adsorption mechanisms. Petroleum acids derived
from some crude oils have been found able to convert systems with initially high risk of plugging
into easily flowable dispersions. In this work, acid fractions are isolated from three oils with low
tendency to form hydrate plugs and from two oils associated with high risk of hydrate plugging
by using an ion-exchange resin. The extracts are further separated into four sub-fractions by solid
phase extraction (SPE). The chemical composition of the fractions is studied by means of HPLC,
GPC, FTIR- and UV/VIS spectroscopy and elemental analysis. The distribution of chemical
compound classes in the fractions differs between the non-plugging and plugging oils, and the
differences are most distinctive in one of the sub-fractions. The results imply that acid sub-fractions
holding a significant proportion of more weakly polar compounds, like ester functionalities, are
important for how the hydrate surfaces and the oil phase interact.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/1404 |
| Date | 07 1900 |
| Creators | Erstad, Kristin, Høiland, Sylvi, Barth, Tanja, Fotland, Per |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | text |
| Rights | Erstad, Kristin; Høiland, Sylvi; Barth, Tanja; Fotland, Per |
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