Process for producing naphthenic bright stocks
AssigneeErgon, Inc.
InventorsJohn K. Patrick, Howard Don Davis, Edward William Casserly
Life of this patent
Estimating the term…
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.
Claims22
A process for producing a naphthenic bright stock comprising the steps of:
- a) dewaxing a hydrotreated deasphalted naphthenic oil having a sulfur content of about 0.01 up to about 0.5% by weight (as measured by ASTM D4294) and a nitrogen content of about 0.01 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 hydrofinished effluent to separate the dewaxed hydrofinished effluent into one or more gaseous fractions and one or more liquid fractions to 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.
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, a pour point (as measured using ASTM D5950) of about 42° C. to about −39° C., and wherein the naphthenic bright stock contains less than 10 ppm total polycyclic aromatic hydrocarbon 8-markers and less than 1 ppm benzo[a]pyrene as evaluated using European standard EN 16143:2013.
Dependencies are inferred from the claim text.