蜡
差示扫描量热法
电场
分析化学(期刊)
光学
复合材料
色谱法
材料科学
物理
化学
热力学
量子力学
作者
Shanzhe Zhang,Xiaorong Sun,Cui-ling Liu,Heyi Zhang,Xinyang Miao,Kun Zhao
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2022-06-02
卷期号:34 (6): 067123-067123
被引量:3
摘要
As a component of crude oils, wax plays an important part in the flowability of waxy oils. The deposition of waxes poses a significant challenge in petroleum production. This paper proposes laser-induced voltage (LIV) to measure the wax appearance temperature (WAT). With a decreased temperature, the peak of the LIV signal (V P ) decreases with a greater slope until the inflection point (T LIV ) after that wax precipitates from the oil. After which, V P changes more slowly. Thus, the T LIV is confirmed as the WAT. Furthermore, the WAT was measured using conventional differential scanning calorimetry, and the results of the two methods are consistent. When a laser irradiates the oil sample, plasma is generated in the liquid due to cascade ionization and multiphoton absorption. The plasma moves based on the effects of an external electric field and generates the LIV. However, temperature changes influence variations in the LIV for waxy oils. In addition, when paraffin precipitates from the oil, it exits as sediment at the bottom of a cuvette, which can impede plasma movement. Therefore, there will be significant differences in the trends before and after WAT. This study demonstrates that LIV offers a way to measure WAT in waxy oils.
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