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Depressive effects evaluation of ethylene-vinyl acetate copolymer on waxy crude oils
YANG Fei, LI Chuan-xian, LIN Ming-zhen
(College of Transport & Storage and Civil Engineering in China University of Petroleum, Dongying 257061, Chirm)
Abstract:
Using Changqing and Qinghai waxy crude oils as research objects, the depressive effects of ethylene-vinyl acetate (EVA) copolymer pour point depressant on the waxy crude oils were studied. The crystallization abilities of waxy crude oils were investigated by differential scanning calorimeter (DSC) and the morphology of wax crystals in the waxy crude oils doped/ undoped with EVA was observed through a polarized light microscope. Meanwhile,the depressive effects of EVA on waxy crude oils were evaluated through pour point tests and rheological experiments. The results show that the crystallization ability of EVA improved slightly by increasing the molecular weight of EVA but deteriorated greatly by increasing the VA content. TTie depressive effects of EVA on waxy crude oils were related not only to the crude oil composition but also to the molecular structure of EVA. With the increase of wax content in crude oils or the average carbon number of waxes, the depressive effects of EVA deteriorated greatly, the molecular weight of EVA affected its depressive effects by controlling the solubility of EVA in waxy crude oils. Tlie depressive effects of EVA were good at the VA content around 28% , when the VA content was too high ( >33% ) or too low ( < 18% ) , however, the depressive effects were poor. The depressive effects of EVA first improved with EVA concentration increasing and then kept nearly unchanged at high EVA concentrations.
Key words:  ethylene-vinyl acetate copolymer  pour point depressant  crystallization ability  wax crystal morphology  depressive effect