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Influence of the chemical structure of additives poly(ethylene‐co‐vinyl acetate)‐based on the pour point of crude oils
Author(s) -
Oliveira Lize M. S. L.,
Nunes Rita C. P.,
Pessoa Larissa M. B.,
Reis Leidiane G.,
Spinelli Luciana S.,
Lucas Elizabete Fernandes
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48969
Subject(s) - pour point , wax , vinyl acetate , hydrocarbon , solubility , ethylene , polymer , chemistry , polymer chemistry , organic chemistry , copolymer , chemical modification , catalysis
ABSTRACT One of the methods to prevent wax precipitation, during petroleum production, transport, and refining, is the use of polymer additives that can reduce the oil pour point. However, no single additive work for all types of crude oil and this relation is not yet well known. In this study, a family of polymers based on poly(ethylene‐co‐vinyl acetate), containing hydroxyl groups and long pendant hydrocarbon chains (from C6 to C18), were synthesized and characterized by H 1 nuclear magnetic resonance and solubility test. Four crude oil samples containing different amounts and size distribution of the wax were used. The additive's action is favored by higher contents of iso + cycloalkanes and lower contents of n‐paraffins with larger chain sizes. The presence of the CH 3 COO group in the copolymers promoted the lowering of the pour point, supported by a low OH concentration and the presence of a long pendant hydrocarbon chain: the best results were obtained with C10 and C12 chain lengths. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48969.