what is synthetic oil made from?

Messages
137
Location
mass
someone tryed telling me yesterday that synthetic oil is made from vegatable oil. ha ha i just laughed. i got to thinking thought. what is synthetic made from? what are the 'base stocks'
 
Messages
1,904
Location
Canada
Crude oil and natural gas. Naptha and ethylene are the intermediates from which PAO synthesis generally takes place.
 
Messages
1,983
Location
New Brunswick
Esters can be synthesised from vegetables, can't they? I doubt you'd find any motor oil with vegtable based esters in it though, unless you had some special need for a food grade lube.
 
Messages
6,436
Location
San Francisco Bay Area
quote:
Originally posted by 55: Esters can be synthesised from vegetables, can't they? I doubt you'd find any motor oil with vegtable based esters in it though, unless you had some special need for a food grade lube.
I believe there are several ways to make esters. Check the following: http://www.hatcocorporation.com/pages/about_esters.html#Polyol%20esters
quote:
The term "polyol esters" is short for neopentyl polyol esters which are made by reacting monobasic fatty acids with polyhedric alcohols having a "neopentyl" structure.
I believe the source fatty acid could be either animal or vegetable fats.
 
Messages
8,711
Location
Nothern USA
There are vegetable oil based motor oils available. Having spent 10 years of my life making paint resins out of vegetable oil, no such concoction will ever go in any engine I own. Without vast quantities of additives, unsaturated oils polymerize. If you do a search, you should be able to find more of my ranting about it. The original ester motor oil was castor oil. It is saturated and less likely to polymerize without modern additives. Note, there are other polyols available to make esters besides neopentyl glycol. You can also esterify alcohols with polybasic acids to form esters. I think both are used in motor oils.
 
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