Prediction of Sludge and Varnish Formation in Base-stock Lubricant Using an Experimental Package
محل انتشار: مجله طراحی فرآیندهای شیمیایی، دوره: 1، شماره: 2
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 66
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شناسه ملی سند علمی:
JR_CPD-1-2_005
تاریخ نمایه سازی: 15 مرداد 1402
چکیده مقاله:
One of the most prevalent problems in the application of lubricants and hydraulic oils is sludge and varnish formation from lubricant degradation. It is believed that thermal degradation is the main reason for sludge formation in lubrication systems. In this study, base-stock lubricant (group I API) underwent the thermal degradation within a temperature range of ۹۰ to ۱۵۰°C for a period of ۱ to ۴۸ hours. In order to obtain a clear justification about lubricant degradation, a new analysis package of experiments consists of FTIR (Fourier Transform Infrared Spectroscopy), viscosity, TAN (Total Acid Number), IFT (Interfacial Tension measurement) and UC (Ultra-Centrifuge) test has been conducted. The results showed that the amount of sludge increases with temperature. Furthermore, all obtained results were analyzed theoretically. We found that when the surface tension suddenly decreases, the amount of sludge in the lubricant has reached its dangerous limit. Since the results of these analyses were a good predictor of sludge production, it can be claimed that the proposed package can be applied for prediction of sludge formation conditions.
کلیدواژه ها:
نویسندگان
Ehsan Pashai
Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Tehran
Mohammad Reza Dehghani
Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology