Abstract
The morphology and structure of wax crystals is one of the most important factors influencing flow properties of waxy crude oils. The pour-point depressant (PPD) improves flow properties of waxy crude oil by modifying the morphology and structure of wax crystals, and this modification, i.e., the effectiveness of PPD, is greatly affected by the oil composition. There have been some investigations into how the oil composition affects the effectiveness of PPD. However, these studies were basically qualitative. The objective of this study is to quantitatively reveal the relationship between the change induced by PPD beneficiation in the morphology and structure of wax crystals and the oil composition. PPD treatment was made on eight waxy crudes, and microscopic observations were performed on the morphology and structure of wax crystals before and after PPD beneficiation. The fractal dimension of the wax crystal microstructure, which was used to characterize the morphology and structure of wax crystals, was de...
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