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3 results on '"Zhang, Dongmin"'

2. The effect of nanohybrid materials on the pour-point and viscosity depressing of waxy crude oil

Author

Shujie Zhi, Li Li, Jiang Baoliang, Feng Wang, Mingshu Yang, Zhang Lixin, Liu Guangwen, Zhang Dongmin, Ouyang Xin, Huo Lianfeng, Yanfen Ding, Mu-yang Ai, and Shimin Zhang

Subjects
Wax, Multidisciplinary, medicine.drug_class, Chemistry, Pour point, hemic and immune systems, chemical and pharmacologic phenomena, Apparent viscosity, bacterial infections and mycoses, Crude oil, complex mixtures, respiratory tract diseases, law.invention, Viscosity, Chemical engineering, law, visual_art, medicine, visual_art.visual_art_medium, Copolymer, Organic chemistry, Depressant, Crystallization, General
Abstract

The pipeline transportation of waxy crude oil is a problem both at home and abroad. In this paper, a novel nanohybrid pour-point depressant (PPD) was used to decrease the pour point and viscosity of waxy crude oil. The pour point and apparent viscosity of waxy crude oil was decreased significantly upon addition of the nanohybrid PPD, and the long-term stability of the nanohybrid PPD was superior to that of a conventional ethylene-vinyl acetate copolymer PPD. Polarized optical microscopy and X-ray diffraction were used to study the effect of the nanohybrid PPD on the crystallization of crude oil. Addition of the nanohybrid PPD reduced the amount of wax crystals, prevented their aggregation, and reduced the temperature at which the crude oil started to crystallize. The significant effect of this nanohybrid PPD on the pour point and viscosity depressing of crude oil is of great importance for facilitating the safe, efficient and energy-minimized transportation of waxy crude oil.

Published
2011

3. Application of Nano-Material Based Hybrid Pour-Point Depressant for Long-Distance Waxy Crude Pipeline

Author

Ouyang Xin, Zhang Lixin, Jiang Baoliang, Huo Lianfeng, Xu Bo, Jianting Li, Zhang Dongmin, Shujie Zhi, Shuai Wang, and Hui Xiong

Subjects
Wax, Materials science, Petroleum engineering, medicine.drug_class, Pipeline (computing), Pour point, Crude oil, Nanomaterials, Pipeline transport, Viscosity, Chemical engineering, visual_art, visual_art.visual_art_medium, medicine, Depressant
Abstract

A new type of nano-material based hybrid pour-point depressant with significant efficiency has been developed and successfully used in industrial application. For Daqing crude oil, a typical high waxy Chinese crude, with 80–100g/t new pour-point depressant and 58–65°C thermal treatment temperature, the wax appearance temperature of the Daqing crude oil can be decreased by 3–4°C. The viscosity/pour-point reduction, shearing resistance, and fluidity at low temperature of the modified crude with new type of pour-point depressant is much better than the effect of using traditional ethylene-vinyl acetate (hereinafter referred as “EVA”). Therefore the safe shutdown time for a pipeline is dramatically increased which not only enhances the safety of the pipeline operation but also significantly saves the energy consumption of the pipeline company. Besides, the reheating temperature can only be greatly reduced to 35°C. The relationship between the crystal structure of the nano-material based pour-point depressant and the type of the waxy crude, together with its influence on the crystal form/wax appearance temperature of the waxy crude by using X ray diffraction (hereinafter referred as “XRD”) and Polarizing microscope (hereinafter referred as “POM”)are studied.Copyright © 2012 by ASME

Published
2012

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