Insight into Liquid Interactions with Fibrous Absorbent Filter Media Using Low-Field NMR Relaxometry. Prospective Application to Water/Jet Fuel Filter–Coalescence,Industrial & Engineering Chemistry Research

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Insight into Liquid Interactions with Fibrous Absorbent Filter Media Using Low-Field NMR Relaxometry. Prospective Application to Water/Jet Fuel Filter–Coalescence
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1021/acs.iecr.7b03837
Korhan S. Osman ₁ , Spencer E. Taylor ₁

Affiliation

We describe a low-field NMR relaxometry study of water and aviation turbine fuel (jet fuel) in contact with samples of fibrous media removed from an unused aviation fuel filter cartridge. This media was studied both in its as-received state and after modifying its wettability. The interaction of liquid droplets with fibers is the basis for fibrous coalescence widely used industrially to separate different types of liquid–liquid dispersion. Here, we are specifically concerned with interactions that potentially occur during the removal of entrained water from jet fuels, an application that is of particular importance on safety grounds, primarily to prevent ice formation in aircraft fuel tanks which could otherwise lead to fuel-line filter blockage and fuel starvation to the engines. Jet fuel is treated using various filtration systems, including cartridge-type microfilters and filter–coalescers, at different points between refinery and aircraft fuel tank in order to remove dirt (particulates) and water and ensure that contamination levels always meet the required specifications. The main objective of the present study was to apply proton NMR relaxometry to provide insight into the water coalescence process, specifically by probing water environments on fibrous media. On the basis of T₂ (spin–spin) relaxation distributions, it has been confirmed that the water environments depend on the media wettability, with three environments being identified: fiber surface adsorbed water,; interfiber absorbed water, and unassociated (largely bulk) water. The use of such NMR techniques may therefore offer potential for monitoring or improving filter–coalescer performance.

中文翻译：

使用低场NMR弛豫法深入了解与纤维吸收性过滤介质的液体相互作用。在水/喷气燃料滤清器中的前瞻性应用-聚结

我们描述了水和航空涡轮机燃料（喷气燃料）与从未使用过的航空燃料滤清器滤芯中取出的纤维介质样品接触的低场NMR弛豫研究。在接受状态和改变其润湿性后都对该介质进行了研究。液滴与纤维的相互作用是纤维聚结的基础，在工业上广泛用于分离不同类型的液-液分散体。在此，我们特别关注在从喷气燃料中去除夹带水的过程中可能发生的相互作用，这是出于安全考虑而特别重要的应用，主要是为了防止飞机燃油箱中结冰，否则可能会导致燃油管路滤清器的结冰。发动机堵塞和燃料不足。喷气燃料使用各种过滤系统进行处理，在炼油厂和飞机油箱之间的不同位置包括滤筒式微过滤器和滤清器滤油器，以清除灰尘（颗粒）和水，并确保污染水平始终符合要求的规格。本研究的主要目的是应用质子NMR弛豫法来提供对水聚结过程的洞察力，特别是通过在纤维介质上探测水环境。在...的基础上特别是在纤维介质上探测水环境。在...的基础上特别是在纤维介质上探测水环境。在...的基础上T ₂（自旋-自旋）弛豫分布，已经证实水环境取决于介质的润湿性，确定了三种环境：纤维表面吸附的水；纤维间吸收了水，而未结合的（大部分是散装的）水。因此，这种核磁共振技术的使用可能为监测或改善滤清器-调压器性能提供潜力。

更新日期：2017-11-30

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