By Don M. Pirro, Ekkehard Daschner, A.A. Wessol
Discusses product fundamentals, desktop parts that require lubrication, tools of software, lubricant garage and dealing with, and lubricant conservation.
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Extra info for Lubrication Fundamentals, Second Edition
Sample text
Two general types of pour point depressant are used: 1. Alkylaromatic polymers adsorb on the wax crystals as they form, preventing them from growing and adhering to each other. 2. Polymethacrylates cocrystallize with wax to prevent crystal growth. The additives do not entirely prevent wax crystal growth, but rather lower the temperature at which a rigid structure is formed. Depending on the type of oil, pour point depression of up to 50ЊF (28ЊC) can be achieved by these additives, although a lowering of the pour point by about 20–30 FЊ (11–17 CЊ) is more common.
Propane, the same solvent used for deasphalting, may be used for dewaxing. 23 Dewaxing cycle flue gas blow. Copyright 2001 by Exxon Mobil Corporation. All Rights Reserved. 24 Dewaxing cycle wax cake discharge. ble and may be filtered from the propane–oil mixture. Methyl isobutyl ketone (MIBK) also has been used as a dewaxing solvent. The operation of these solvents is generally similar to that of MEK–toluene. G. Catalytic Dewaxing Catalytic dewaxing is a cost-effective and flexible altnerative to solvent dewaxing for lube base stock manufacture.
The specific gravity (relative density) is the ratio of the mass of a given volume of a material at a standard temperature to the mass of an equal volume of water at the same temperature. API gravity is a special function of specific gravity (sp gr), which is related Copyright 2001 by Exxon Mobil Corporation. All Rights Reserved. 5 sp gr 60/60ЊF The API gravity value, therefore, increases as the specific gravity decreases. Since both density and gravity change with temperature, determinations are made at a controlled temperature and then corrected to a standard temperature by use of special tables.
