Naphthenic Oils

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MolaKule

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Supply the missing words:

Naphthenic oils (Group V) are sometimes called ______ ____ and are rich in ____________.





This question is open to ALL.
 
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I had to Google it,,,,
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Wait, are naphthenics GroupV? Like the naphthenic transformer oils produced by Ergon and Cross Oil (Martin)? These naphthenic oils are more cyclic, crude based, not really polyol ester type oils.
 
Originally Posted by OilSwine
Wait, are naphthenics GroupV? Like the naphthenic transformer oils produced by Ergon and Cross Oil (Martin)? These naphthenic oils are more cyclic, crude based, not really polyol ester type oils.

Not all Group V oils are synthesized, or esters, or have to be to fall into the API Group V classification.

Quote
Group V embraces everything else, ranging from some very low-quality naphthenics all the way up to some very exotic synthetic oils. Other occupants of this group are organic esters, compressor oil, some biodegradable


See chart on Page 33 of 35:


STLE Page 33 Chart
 
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Many good answers but RDY4WAR had the first correct and complete answer.

Group V Naphthenic oils are sometimes called "Pale Oils" because of their pale color and are rich in cyclo-parrafins.

Cyclo-parrafins (also called "naphthenes") are saturated cyclic hydrocarbons of the general formula CnH2n, i.e, a hydrocarbon with a molecule containing a ring (cyclic) of carbon atoms joined by single bonds.

They are rich in aromatics which gives them a solvency advantage for certain additives.

Their low paraffin (a flammable, whitish, translucent, waxy solid consisting of a mixture of saturated hydrocarbons) content gives them an inherently low pour point.

But they also have a relatively low VI and their lubricating performance and oxidation stability are poor.

Their applications are in transformer oils, additive solvents, spray cans as the solvents for lubes and rust preventives, and other specialty applications.
 
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Group I base oil stocks contain greater than 0.03% sulfur, less than 90% saturates. Groups II and III are both hydroprocessed oils with comparable purity and typically 99% saturates.
Cyclo-parrafins (also called "naphthenes") are saturated cyclic hydrocarbons.

Thus, naphthenic oils belong to 1-3 groups, depending on the content of sulfur and aromatic hydrocarbons. ?
 
Originally Posted by Loma

Cyclo-parrafins (also called "naphthenes") are saturated cyclic hydrocarbons.

Yes, as stated above.

Originally Posted by Loma
Thus, naphthenic oils belong to 1-3 groups, depending on the content of sulfur and aromatic hydrocarbons. ?


API designated Group V oils consist of any type of base oil other than mentioned in the previously defined groups. If it is a synthetic oil and it is not PAO it is a group V base oil. API Group V oils include, among others, naphthenic oils and esters. Usually Group V oils are not used as a base oil but as an additive to other base oils.

Naphthenics have a relatively low VI and their lubricating performance and oxidation stability are poor.
 
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Molakule your posts are always so informative. Thanks for educating the online anony folks!

Ty
 
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