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Lubricating oil compositions having improved low temperature properties

a technology of lubricating oil and composition, which is applied in the direction of lubricant composition, liquid carbonaceous fuel, fuel, etc., can solve the problems of significant reduction of process lube yield and detriment

Inactive Publication Date: 2008-12-04
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited amounts of such pour point depressants are used because the addition of too much of the pour point depressant can have detrimental effects on the oil being treated, e.g., the pour point can go up or the oil solidifies.
Gas-to-liquids base stocks usually have pour points ranging from 0° C. to −25° C. If one tries to produce GTL derived base stocks with pour points much below −25° C., the process lube yield will be decreased significantly, which is undesirable.

Method used

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  • Lubricating oil compositions having improved low temperature properties
  • Lubricating oil compositions having improved low temperature properties
  • Lubricating oil compositions having improved low temperature properties

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0162]Various base stocks were used for blending with the alkyl naphthalene fluids in the examples and these base stocks are presented below in combination with various amounts of the alkylated naphthalene fluid AN5 showing the effect on pour point (reported in ° C.).

TABLE 2Wt % AN5052060100Group I−21−27−29−32−39Group III−25−26−28−32−39GTL 6−21−27−36−42−39PAO 6−58−58−50−47−39

[0163]As is shown, when the alkylated naphthalene (AN5) was blended with API Group I or Group III base stock, there is no synergistic improvement of the pour point. While the pour point of such blends were decreased, the amount of the decrease is never below the pour point of the AN base stock. When combined with PAO, the AN actually degraded pour point performance. However, when AN was blended with GTL-6 (having a pour point of −21° C.) the pour point improvements associated with the blends were non-linear (see FIG. 1 and Table 3). Data in Table 3 further demonstrated that the oxidative stabilities of the blend...

example 2

[0164]Various amounts of AN5 (described above) were combined with GTL-14 (nominal kinematic viscosity at 100° C. of 14 mm2 / s). The results are presented in Table 4 below:

TABLE 4Wt % of AN5052060100Wt % of GTL 141009580400Grams of AN502.57.125300Grams of GLT 14047.528.5200Grams total05035.625500Kv 100° C., cS14.313.6411.727.734.76Kv 40° C., cS94.9890.2976.447.3228.16VI15514313711964Pour point, ° C.−24−27−36−42−39

[0165]As is seen the pour point of the GTL was still synergistically improved by the addition of the alkylated naphthelene fluid.

example 3

[0166]Various amounts of AN12 (described above) were combined with GTL-6. The results are presented in Table 5.

TABLE 5Wt % of AN1202060100Wt % of GTL-610080400Kv 100° C., cS6.026.788.9013.20Kv 40° C., cS29.7636.7258.82118.59VI14113311797Pour point, ° C.−21−30−39−39RBOT, Minutes (D2272)68111127128

[0167]Again, it is seen that the addition of alkylated naphthalene, in this instance a high viscosity AN, to a GTL (GTL-6) resulted in a blend which exhibited a non-linear reduction in pour point. Furthermore, the oxidative stabilities of the blends were improved synergistically. The RBOT increased from 68 minutes to 111 minutes, when 20 wt % of AN12 was added.

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Abstract

A lubricating base oil is disclosed comprising a mixture of gas-to-liquids (GTL) base stock / base oil, hydrodewaxed or hydroisomerized / catalytic (and / or solvent) dewaxed wax derived base stock / base oil and from about 1 to 95% by weight of an alkylated naphthalene or alkylated benzene synthetic oil having a pour point of 0° C. or less. The pour point of the base oil is dramatically lowered by the addition of the synthetic oil.

Description

[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 921,283 filed Mar. 30, 2007.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to lubricating oils of improved low temperature properties, especially viscometrics, and low pour points, and to a method for improving the low temperature properties, especially viscometrics, and reducing the pour points of gas-to-liquid (GTL) lubricating oils.[0004]2. Description of the Related Art[0005]Lubricating oils and formulated lubricating oils (i.e., lubricating oils comprising mixtures of lubricating oil base stocks / base oils with one or more performance additives) used in most lubrication processes must be capable of delivering lubrication performance at low temperatures, be they low startup temperature or sustained low operating temperature.[0006]To this end, lubricating oils, having better low temperature properties, especially reduced low temperature viscometrics, are ...

Claims

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Application Information

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IPC IPC(8): C10M143/00C10M169/04
CPCC10M111/04C10N2260/02C10M2203/065C10M2203/1006C10M2203/1025C10M2205/0285C10M2205/173C10M2205/223C10N2220/022C10N2220/023C10N2220/028C10N2230/02C10N2230/08C10N2230/10C10M111/06C10N2020/02C10N2020/011C10N2020/071C10N2030/02C10N2030/10C10N2030/08C10N2060/02C10M127/06
Inventor WU, MARGARET M.BAILLARGEON, DAVID J.
Owner EXXON RES & ENG CO
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