MolaKule
Staff member
Alkylated Naphthalenes ( AN's)
By MolaKule
Alkylated Naphthalenes (AN’s) or”alkylnaphthalenes” are a class of fluids of “alkylated aromatics” and were first developed as Pour Point Depressants (PPD’s) in mineral oils. These were made by reacting alkylating agents with naphthalenes and suitable catalysts.
Another alkylated aromatic that has previously been used in manual transmission lubes are the alkylated benzenes.
As such, the AN’s fall into the Group V base oil category.
From the latest literature, there are about 20 or more different approaches to producing AN’s. In one patent application, the AN is” The hydrocarbyl aromatic is…..alkylated naphthalene (primarily mono-alkylated) having a kinematic viscosity of approximately 4.6 cSt at 100.degree. C. The primarily mono-alkylated naphthalene is prepared by the alkylation of naphthalene with an olefin primarily comprised of 1-hexadecene.”
Today, the AN’s are being used as partial replacements for esters in fully formulated synthetic and mineral based PCMO and diesel motor oils.
From the most recent patent literature, companies such as Exxon Mobil are currently using an olefinic methylnaphthalenes such as is described in this and previous patents:
http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=56&f=G&l=50&d=PG01&s1=%22alkylated+naphthalenes%22&p=2&OS="alkylated+naph thalenes"&RS="alkylated+naphthalenes"
It is believed that these “higher” naphthalenes exhibit better thermal and oxidative stability than previous AN's.
From another patent application, the new Blends may be composed of, “One of ordinary skill in the art would easily note that these findings may be extended to any paraffinic base stock. The inventors note that this discovery may also employ Group III base stocks, and preferably Gas-to-Liquids or Fischer-Tropsch base stocks. Thus, as an non-limiting illustrative sample, the inventors also note that a mixture of about 30 wt % Group III base stock, about 30 to 40% PAO, about 2 wt % Trimethylolpropane and about 5 to 40 wt % Hydrocarbyl Aromatics, with the remainder being a Performance Additive package will also achieve the same surprising Fuel Economy increases.”
So some new formulations may be incorporating AN’s as well as eters in their GroupIII formulations.
[ May 01, 2005, 05:35 PM: Message edited by: MolaKule ]
By MolaKule
Alkylated Naphthalenes (AN’s) or”alkylnaphthalenes” are a class of fluids of “alkylated aromatics” and were first developed as Pour Point Depressants (PPD’s) in mineral oils. These were made by reacting alkylating agents with naphthalenes and suitable catalysts.
Another alkylated aromatic that has previously been used in manual transmission lubes are the alkylated benzenes.
As such, the AN’s fall into the Group V base oil category.
From the latest literature, there are about 20 or more different approaches to producing AN’s. In one patent application, the AN is” The hydrocarbyl aromatic is…..alkylated naphthalene (primarily mono-alkylated) having a kinematic viscosity of approximately 4.6 cSt at 100.degree. C. The primarily mono-alkylated naphthalene is prepared by the alkylation of naphthalene with an olefin primarily comprised of 1-hexadecene.”
Today, the AN’s are being used as partial replacements for esters in fully formulated synthetic and mineral based PCMO and diesel motor oils.
From the most recent patent literature, companies such as Exxon Mobil are currently using an olefinic methylnaphthalenes such as is described in this and previous patents:
http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=56&f=G&l=50&d=PG01&s1=%22alkylated+naphthalenes%22&p=2&OS="alkylated+naph thalenes"&RS="alkylated+naphthalenes"
It is believed that these “higher” naphthalenes exhibit better thermal and oxidative stability than previous AN's.
From another patent application, the new Blends may be composed of, “One of ordinary skill in the art would easily note that these findings may be extended to any paraffinic base stock. The inventors note that this discovery may also employ Group III base stocks, and preferably Gas-to-Liquids or Fischer-Tropsch base stocks. Thus, as an non-limiting illustrative sample, the inventors also note that a mixture of about 30 wt % Group III base stock, about 30 to 40% PAO, about 2 wt % Trimethylolpropane and about 5 to 40 wt % Hydrocarbyl Aromatics, with the remainder being a Performance Additive package will also achieve the same surprising Fuel Economy increases.”
So some new formulations may be incorporating AN’s as well as eters in their GroupIII formulations.
[ May 01, 2005, 05:35 PM: Message edited by: MolaKule ]