Deep Desulfurization of Light Oil through Extraction and Oxidation Processes using H O /Tungstophosphoric Acid in Room-temperature Ionic Liquids 2 2 Li-Lin Chuang,a Jung-Fu Huang,a Wen-Hen Lo...
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Project Report
13.01.13
C hang i ng Oi l Based on Oxi dati on
Changing Oil Based Based on Oxidation Noria Nor ia Co rpor rporation ation change s , oil analysis Tags: oil oxidation , oil change
"As oil ages, it oxidizes. What is the best indicator that the oil has oxidized too much and should be changed based upon the results given in a typical oil analysis? We analyze the oil from our mixer gearboxes and will typically run the same oil in the gearbox for several years as long as the oil analysis comes back with good results." The first issue here is to define a "typical" oil analysis. analysis. Most labs labs have several s everal test tes t packages to choose from that may or may not give an overall solid feel for lubricant oxidation. In order to identify lubricant oxidation, it is important to include oil properties monitoring as part of your regular test package. This will allow for the extension of drain drain intervals based on lubricant lubricant condition as well as help to identify adverse operating conditions that may exist. Common tests that cover lubricant properties include viscosity, neutralization number (acid number number for industrialindustrial- based lubricant lubricant s, base number for mobile equipment) and FTIR. The values of the results in all of these tests will increase as the level of oxidation increases (with the exception of base number, which will decrease dec rease as t he level of ac ids ids increase via the oxid oxidation ation proc process). ess). A couple of common field tests that can help to indicate possible oxidation are darkening color and foul odor. Oxidation usually has a sour or pungent odor, similar to rotten eggs. It occurs when the hydrocarbon constituents of lube oil combine chemically with oxygen. As with the laboratory tests, it is important that sensory testing is compared to that of a virgin oil base sample. Just like with most chemical reactions, oil oxidation is accelerated by heat and pressure. It is no different than other commonly encountered oxidation reactions, such as rusting. Just like the effec ts that rusting rusting and other corrosive corrosive proc processes esses have on metal metal substrates, oil oxid oxidation ation results in a catastrophic and permanent chemical change to the base oil molecules. The net effect of prolonged oxidation is that the oil becomes acidic (chemically), causing corrosion, while an increase in viscosity occurs (physically). Oxidation will generally happen at a slow rate under optimum conditions; however, as the health of the lubricant decreases, the rate of degradation will increase. There are several other factors that, if not controlled, can lead to increased rates of oxidation. These factors include heat, air, water and metallic particles. Using a combination of these tests will assist in pinpointing positive levels of oxidation. www.machi ner yl ubr i cati on.com/Ar ti cl es/Pr i nt/28828
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13.01.13
Changing Oil Based on Oxidation
Combined with appropriate equipment monitoring tests and contaminant tests, root causes of oxidation can also be found and controlled.
