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Viscosity and Surface Tension of Fluorene and Perhydrofluorene Close to 0.1 MPa up to 573 K
Journal of Chemical & Engineering Data ( IF 2.6 ) Pub Date : 2022-09-12 , DOI: 10.1021/acs.jced.2c00519
Junwei Cui 1 , Manuel Kerscher 1 , Julius H. Jander 1 , Timo Rüde 2 , Peter S. Schulz 3 , Peter Wasserscheid 2, 3 , Michael H. Rausch 1 , Thomas M. Koller 1 , Andreas P. Fröba 1
Affiliation  

In the present study, the liquid viscosity and surface tension of fluorene (H0-F) and its fully hydrogenated counterpart perhydrofluorene (H12-F), representing process-relevant byproducts of the liquid organic hydrogen carrier (LOHC) system based on diphenylmethane and dicyclohexylmethane and potentially interesting LOHC compounds by themselves, were determined close to 0.1 MPa using different experimental methods. Besides surface light scattering (SLS) allowing for a simultaneous access to both properties up to 573 K, conventional methods in the form of capillary viscometry and pendant-drop tensiometry were applied up to (473 and 523) K, respectively. Furthermore, the liquid density of H12-F was measured by vibrating-tube densimetry from (283 to 473) K. While agreement of the viscosity and surface tension results obtained by SLS and the conventional methods is found in the case of H12-F, this is not given for H0-F, especially with respect to its surface tension, which seems to be caused by SLS-specific effects. H0-F exhibiting a melting point of about 384 K shows larger values for density, surface tension, and viscosity compared to H12-F being liquid at 283 K. The latter compound features stereoisomerism which appears to have a pronounced effect on the thermophysical properties. This could be deduced by comparison with the very limited amount of experimental data for the fluorene-based substances that are available in the literature so far. The extension of the thermophysical property database for H0-F and H12-F under process-relevant conditions can be useful for future studies, particularly in the field of chemical hydrogen storage.

中文翻译:

芴和全氢芴的粘度和表面张力接近 0.1 MPa 至 573 K

在本研究中,芴 (H0-F) 及其完全氢化的对应物全氢芴 (H12-F) 的液体粘度和表面张力,代表基于二苯甲烷和二环己基甲烷的液态有机氢载体 (LOHC) 系统的工艺相关副产物和潜在有趣的 LOHC 化合物本身,使用不同的实验方法测定接近 0.1 MPa。除了表面光散射 (SLS) 允许同时获得高达 573 K 的两种特性外,毛细管粘度测定法和悬滴张力测定法形式的常规方法分别应用于高达 (473 和 523) K 的温度。此外,H12-F 的液体密度通过 (283 至 473) K 的振动管密度计测量。虽然在 H12-F 的情况下发现通过 SLS 和传统方法获得的粘度和表面张力结果一致,但对于 H0-F 没有给出这点,尤其是关于其表面张力,这似乎是由 SLS 引起的- 特定效果。与在 283 K 时为液态的 H12-F 相比,熔点约为 384 K 的 H0-F 显示出更大的密度、表面张力和粘度值。后一种化合物具有立体异构性,似乎对热物理性质具有显着影响。这可以通过与迄今为止文献中可用的芴基物质的非常有限的实验数据进行比较来推断。在工艺相关条件下扩展 H0-F 和 H12-F 的热物理性质数据库可用于未来的研究,
更新日期:2022-09-12
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