New Method for Gelation Temperature Measurement without Disturbing the Crystal Network,Industrial & Engineering Chemistry Research

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New Method for Gelation Temperature Measurement without Disturbing the Crystal Network
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-06-03 , DOI: 10.1021/acs.iecr.1c00944
Sachin Balasaheb Shinde ₁ , Lalit Kumar ₁

Affiliation

The present study proposes a new nonoscillatory nonrotary (NONR) method to measure gelation temperature based on a temperature-dependent normal force. A variation in the normal force signal is observed due to the combined effect of volume shrinkage and wax crystal network. The sample retains fluidity above the gelation temperature, in the absence of a gel network. The proposed method shows good repeatability for a model waxy oil and real crude oils. The results of the NONR method are consistent with the results from earlier methods. Gelation temperature measurement using the NONR method does not require gel movement. However, all of the existing rheological methods use either shear stress or shear rate, which participates in the gelation process. The gelation temperatures of 15% macrocrystalline wax in the dodecane sample measured using constant shear stress, constant shear rate, oscillatory, and NONR methods are 26.6, 27.5, 26.8, and 27.0 °C, respectively.

中文翻译：

不干扰晶体网络的凝胶温度测量新方法

本研究提出了一种新的非振荡非旋转 (NONR) 方法来测量基于温度相关法向力的凝胶温度。由于体积收缩和蜡晶网络的共同作用，观察到法向力信号的变化。在没有凝胶网络的情况下，样品在凝胶化温度以上保持流动性。所提出的方法对模型含蜡油和真实原油显示出良好的可重复性。NONR 方法的结果与早期方法的结果一致。使用 NONR 方法测量凝胶温度不需要凝胶运动。然而，所有现有的流变学方法都使用剪切应力或剪切速率，它们参与了凝胶化过程。

更新日期：2021-06-17

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