The impact of different lateral size of graphene oxide on the performance of the emulsified acrylate-based pour point depressant and its application in crude oil
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Date
2018-06
Authors
Darryl Wong, Jun Chen
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Abstract
The different lateral size of GOs were obtained through ultrasonication method
at 0 min, 10 min, 30 min, 60 min and 100 min. The SEM results shows that the longer
the ultrasonication time, the smaller the average lateral size of the GO nanosheets. The
results from FTIR is used to shows the presence of the oxygen functional group in the
GO nanosheets after subjected to ultrasonication. The addition of different lateral size
GO into the emulsified acrylate-based PPD-GO shows that the acrylate-based droplets
size increases, more polydisperse and reduce in zeta potential. However, when the
emulsified acrylate PPD-GO is at isothermal and freeze thaw condition, the effect of the
different lateral size of the GO after aging not that significant. The rheological
measurement shows that 10 min is the optimum ultrasonication time to produce the
ideal lateral size of GO nanosheets that leads to improvement in flowabiltiy and stability
of the emulsified acrylate-based PPD-GO. Besides, it shows the highest reduction of
pour point on the crude oil and improve rheological behaviour of the crude oil in terms
of shear stress and viscosity. Exceeding the optimum ultrasonication time, the reducing
lateral size of GO will produce negative impact on the flowability and the stability of
the emusified acrylate PPD-GO and its performnce in crude oil. Lastly, the study on
Herschel-Buckley model has proven to be more accurate in prediction of yield stress
and fluid behaviour of emulsified acrylate-based PPD-GO compare to crude oil.