Process for producing naphthenic bright stocks
AssigneeErgon, Inc.
InventorsJohn K. PATRICK, Howard Don DAVIS, Edward William CASSERLY
Life of this patent
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Abstract
A process for producing naphthenic bright stocks from low quality naphthenic crude feedstocks. The naphthenic bright stocks produced by the process have improved low temperature properties at high yields based on feedstock.
Claims27
A process for producing a naphthenic bright stock comprising the steps of:
- a) dewaxing a hydrotreated deasphalted naphthenic oil having a sulfur content of up to about 0.5% by weight (as measured by ASTM D4294) and a nitrogen content of up to about 0.1% by weight (as measured by ASTM D5762) in the presence of a dewaxing cracking catalyst and under catalytic dewaxing conditions to produce a dewaxed effluent;
- b) hydrofinishing the dewaxed effluent to produce a dewaxed hydrofinished effluent having reduced levels of polycyclic aromatic hydrocarbon compounds and reduced levels of unstable olefinic compounds;
- and
- c) fractionating the dewaxed effluent to remove one or more low viscosity high volatility fractions and provide a naphthenic bright stock having a pour point (as measured by ASTM D5949) reduced by 10° C. compared to that of the deasphalted naphthenic oil, at a yield greater than 85% of total naphthenic bright stock over total deasphalted naphthenic oil.
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The process of claim 0, wherein the naphthenic bright stock contains no more than 20 ppm total of the polycyclic aromatic hydrocarbon compounds.
The process of claim 0, wherein the naphthenic bright stock contains no more than 10 ppm total of the polycyclic aromatic hydrocarbon compounds.
A naphthenic bright stock having an aniline point (as measured by ASTM D611) of about 100° C. to about 140° C., a flash point (as measured using a Cleveland Open Cup and ASTM D92) of about 188° C. to about 409° C., a viscosity index (VI) greater than 75, a viscosity (SUS at 98.9° C.) of about 165 to about 250, and a pour point (as measured using ASTM D5950) of about 42 ° C. to about −39° C.
Dependencies are inferred from the claim text.