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  Cycloalkane base oils, cycloalkane-base dielectric liquids made using cycloalkane base oils, and methods of making sameUSPTO Application #: 20060100466Title: Cycloalkane base oils, cycloalkane-base dielectric liquids made using cycloalkane base oils, and methods of making same Abstract: Cycloalkane base oil, methods of making cycloalkane base oil, and dielectric liquid containing such cycloalkane base oil is provided. The cycloalkane base oil contains a quantity of isoparaffins and from 50 wt. % to 70 wt. % cycloalkanes having the formula CnH2n wherein n is from 15 to 30, the quantity of isoparaffins being less than 50 wt. % of said cycloalkane base oil. (end of abstract) Agent: Shell Oil Company - Houston, TX, US Inventors: Steven Allen Holmes, John Robert Powers, Michael Phillip Smith USPTO Applicaton #: 20060100466 - Class: 585001000 (USPTO) Related Patent Categories: Chemistry Of Hydrocarbon Compounds, Product Blend, E.g., Composition, Etc., Or Blending Process Per Se The Patent Description & Claims data below is from USPTO Patent Application 20060100466. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE APPLICATION [0001] The application relates to "cycloalkane" base oil(s), to cycloalkane-base dielectric liquid(s) made using the cycloalkane base oil(s), to methods of making the cycloalkane base oil(s) and to the cycoalkane-base dielectric liquid(s). BACKGROUND [0002] Dielectric liquids typically are manufactured from a gas oil fraction derived at atmospheric pressure from naphthenic crudes. Dielectric liquids manufactured using other feedstocks are desirable. BRIEF SUMMARY [0003] The present application provides cycloalkane base oil comprising a quantity of isoparaffins and from 50 wt. % to 70 wt. % cycloalkanes having the formula C.sub.nH.sub.2n wherein n is from 15 to 30, said quantity of isoparaffins being less than 50 wt. % of said cycloalkane base oil. [0004] The application also provides a cycloalkane-base dielectric liquid comprising: [0005] cycloalkane base oil comprising a quantity of isoparaffins and from 50 wt. % to 70 wt. % cycloalkanes having the formula C.sub.nH.sub.2n wherein n is from 15 to 30, said quantity of isoparaffins being less than 50 wt. % of said cycloalkane base oil; and, [0006] one or more non-phenolic alkyl substituted or partially saturated aromatic anti-gassing agent comprising at least one labile hydrogen atom, said quantity being effective to reduce the gassing tendency of the dielectric liquid. [0007] The application provides a method for making a cycloalkane base oil comprising: [0008] refining crude under refining conditions effective to produce aromatic vacuum gas oil boiling at a temperature in the range of from about 371.degree. C. to about 538.degree. C., the aromatic vacuum gas oil comprising carbonaceous materials, a majority of the carbonaceous materials being selected from the group consisting of cycloalkanes and aromatics; [0009] contacting the aromatic vacuum gas oil with hydrocracking catalyst under hydrocracking conditions effective to produce hydrocracking product; [0010] subjecting hydrocracking product to stripping conditions effective to increase the content of cyclic hydrocarbons selected from the group consisting of cycloalkanes, cycloalkenes, and combinations thereof and removing hydrogen sulfide and ammonia and producing stripped hydrocracking product; [0011] contacting stripped hydrocracking product with isomerization/dewaxing/hydrogenation (IDH) catalyst comprising a metal selected from the group consisting of platinum, palladium, and combinations thereof, under IDH conditions effective to saturate aromatics to cycloalkanes, reduce normal paraffins, and to produce IDH product comprising greater than 50 wt. % of one or more cyclic hydrocarbons selected from the group consisting of cycloalkanes and cycloalkenes; [0012] without solvent extracting, contacting IDH product with hydrotreating catalyst under hydrotreating conditions effective to produce hydrotreated product comprising greater than 50 wt. % cycloalkanes; and, [0013] separating from said hydrotreated product cycloalkane base oil comprising less than 50 wt. % isoparaffins and 50 wt. % or more cycloalkanes, said cycloalkane base oil boiling at a temperature in the range of from about 260.degree. C. to about 371.degree. C. [0014] A method for making a cycloalkane base dielectric liquid comprising: [0015] providing cycloalkane base oil comprising a quantity of isoparaffins and from 50 wt. % to 70 wt. % cycloalkanes having the formula C.sub.n H.sub.2n wherein n is from 15 to 30, said quantity of isoparaffins being less than 50 wt. % of said cycloalkane base oil; and, [0016] adding to said cycloalkane base oil one or more agent selected from the group consisting of an amount of antigassing agent effective to reduce gassing tendency of the cycloalkane base oil and a quantity of one or more antioxidant selected from the group consisting of hindered phenols, cinnamate type phenolic esters, and alkylated diphenylamines, said quantity of one or more antioxidant being effective to reduce sludge formation and total acid number in mg of KOH/g (TAN) under oxidation conditions. DETAILED DESCRIPTION [0017] The present application provides cycloalkane base oil(s) for producing cycloalkane-base dielectric liquid(s). [0018] A "cycloalkane base oil" is produced from an aromatic base oil feedstock, preferably an "aromatic vacuum gas oil" produced from the refining of crude oil. Substantially any crude oil may be used as the source of the aromatic vacuum gas oil. Suitable crudes include, but are not necessarily limited to: Arabian Light, Arabian Medium, Arab Heavy, Orienta, Kuwati, Isthmus, Maya, Oman, Brent, and combinations thereof. [0019] A majority of the carbonaceous materials in suitable "aromatic vacuum gas oils" are selected from the group consisting of cycloalkanes and aromatics. Aromatic vacuum gas oil generally comprises the following distribution of carbonaceous materials, in descending order of concentration: aromatics>cycloalkanes>isoparaffins>normal paraffins. [0020] Suitable aromatic vacuum gas oils boil at a temperature in the range of from about 260.degree. C. (500.degree. F.) to about 538.degree. C. (1000.degree. F.), preferably from about 371.degree. C. (700.degree. F.) to about 538.degree. C. (1000.degree. F.). The aromatic content of suitable aromatic vacuum gas oils is from about 40 wt. % to about 60 wt. %. In preferred embodiments, the aromatic content of the aromatic vacuum gas oils is from about 50 to about 60 wt. %, more preferably from about 55 wt. % to about 60 wt. %. Aromatic vacuum gas oils also typically comprise from about 20 wt. % to about 30 wt. % cycloalkanes, from about 10 wt. % to about 15 wt. % isoparaffins, from about 5 wt. % to about 15 wt. % normal paraffins. Continue reading... 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