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| Effects of pour point depressants on crystal lattice parameters of waxes |
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JIANG Qing-zhe1,SONG Zhao-zheng1,GE Ji-jiang2,ZHAO Fu-lin2
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(1. State Key Laboratory of Heavy Oil Processing in China University o f Petroleum，Beijing 102249，China ;2. College of Petroleum Engineering in China University of Petroleum, Dongying 257061，China)
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| Abstract: |
| The effects of polyacrylate behenyl on crystal lattice parameters of waxes in crude oil were studied by X-ray diffractone-ter and polar microsocpe. The results show that the wax crystals separated frcm crude oil are ortborhcmbic crystals whose interpla-nar spacing is 0.4156 nm and crystal d^ree is 70.5%, showing long-range order. The interpianar spacing and conversion trend of wax crystals are increased fran orthorhcmbic crystals to hexagonal crystals for the colloid and asphaltene existing, showing short-range order. The conversion trend of wax crystals frcm orthorhcmbic crystals to hexagonal crystals mainly depends on the properties and contents of crude oil ccmponents. Pour point depressants can reduce the order d^ree, and increase the interpianar spacing of wax crystals to 0.4190 ran. At the same time, 57% of wax crystals beocme into hexagonal crystals. So the interaction force of wax crystals is reduced, and the pour point and viscosity of crude oil are reduced. |
| Key words: pour point depressant wax orthorhombic crystal hexagonal crystal interpianar spacing |
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