Engeländer Karin, Duchowny Anton, Blümich Bernhard, Adams Alina
OWI Science for Fuels gGmbH, RWTH Aachen University, 52134 Herzogenrath, Germany.
Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, 52074 Aachen, Germany.
ACS Omega. 2022 Jul 18;7(30):26256-26264. doi: 10.1021/acsomega.2c01970. eCollection 2022 Aug 2.
The long-term aging processes during storage of different heating oils and their blends with biofuels including fatty acid methyl ester, hydrogenated vegetable oil, and power-to-liquids products were followed by different analytical techniques, and the aging products were analyzed. While most standard techniques are time-consuming and labor-intensive and specify only a single property, analyses by benchtop nuclear magnetic resonance spectroscopy proved to be effortless and fast. Moreover, only 0.4 mL of the sample is required for nondestructive NMR measurements. White and waxlike precipitates were found in FAME stored at a cold temperature and identified as esters of glycerol with saturated side chains by chromatographic, thermal, and spectroscopic analyses. At colder temperatures, they reversibly precipitate and can lead to system failure.
采用不同的分析技术跟踪了不同加热油及其与生物燃料（包括脂肪酸甲酯、氢化植物油和电力制液体产品）的混合物在储存过程中的长期老化过程，并对老化产物进行了分析。虽然大多数标准技术既耗时又费力，而且只能指定单一特性，但台式核磁共振光谱分析证明既轻松又快速。此外，无损核磁共振测量仅需0.4毫升样品。在低温储存的脂肪酸甲酯中发现了白色蜡状沉淀物，通过色谱、热分析和光谱分析鉴定为具有饱和侧链的甘油酯。在较低温度下，它们会可逆地沉淀，并可能导致系统故障。
