Transformer oil basestock and transformer oil composition comprising the same
AssigneeExxonMobil Chemical Patents Inc.
InventorsRonald R. Hill, Jr., Caterina T. H. Tran, Andrew P. Broenen, Shaival R. Mehta, Daniel X. Bien
Life of this patent
Estimating the term…
Abstract
A transformer oil basestock is disclosed that includes at least 99 wt % of naphthenes and paraffins, based on the total weight of the transformer oil basestock, wherein the weight ratio of naphthenes to paraffins is at least 1, as measured by GC-MS, and wherein the paraffins consist essentially of isoparaffins, as determined by GC-FID. In addition, a transformer oil composition is disclosed that includes the transformer oil basestock, an anti-gassing agent and an antioxidant.
Claims20
A transformer oil composition, comprising:
- a basestock comprising at least 99 wt % of naphthenes and isoparaffins as determined by GC-FID, and less than or equal to 1 wt % total aromatics, as measured by ASTM D7419, based on the total weight of the transformer oil basestock, wherein:
- the weight ratio of the naphthenes to the isoparaffins is from 1.2 to 4.0, as measured by GC-MS,
- the basestock has a viscosity index (VI) of 80-100, as calculated based on ASTM D2270;
- the basestock has an initial boiling point (IBP) of at least 280° C. and a final boiling point (FBP) of at most 380° C.,
- the basestock has a distillation range as defined by (FBP-IBP) of at most 100° C., a distillation range as defined by (T90−T10) of at most 60° C., as measured by ASTM D86;
- and
- the basestock has a flash point of at least 145° C., as measured by ASTM D92;
- an anti-gassing agent;
- and
- an antioxidant.
A transformer oil composition, comprising:
- a basestock consisting essentially of naphthenes and isoparaffins, wherein a weight ratio of the naphthenes to the isoparaffins is from 1.2 to 4.0, as measured by GC-MS;
- an anti-gassing agent;
- and
- an antioxidant, wherein the composition has:
- a viscosity index (VI) of 80 to 100, as calculated based on ASTM D2270;
- a pour point of at most −40° C., as measured by ASTM D97;
- a kinematic viscosity at 100° C. of from 2 to 3 mm2/s, as measured by ASTM D445;
- and
- a kinematic viscosity at −30° C. of from 200 to 500 mm2/s, as measured by ASTM D445.
A transformer oil composition, comprising:
- a basestock derived by fractionation of a vacuum gas oil feedstock, wherein the basestock consists essentially of at least 99 wt % of naphthenes and isoparaffins as determined by GC-FID, and less than or equal to 1 wt % total aromatics, as measured by ASTM D7419, based on the total weight of the basestock, wherein:
- the weight ratio of the naphthenes to the isoparaffins is from 1.2 to 4.0, as measured by GC-MS,
- the basestock has a viscosity index (VI) of 80-100, as calculated based on ASTM D2270;
- the basestock has an initial boiling point (IBP) of at least 280° C. and a final boiling point (FBP) of at most 380° C.,
- the basestock has a distillation range as defined by (FBP-IBP) of at most 100° C., a distillation range as defined by (T90−T10) of at most 60° C., as measured by ASTM D86;
- and
- the basestock has a flash point of at least 145° C., as measured by ASTM D92;
- an anti-gassing agent;
- and
- an antioxidant,
- wherein the transformer oil composition has two or more of the following properties:
- a pour point of at most −40° C., as measured by ASTM D97;
- a kinematic viscosity at 100° C. of from 1 to 3 mm2/s, as measured by ASTM D445;
- a kinematic viscosity at 40° C. of from 4 to 12 mm2/s, as measured by ASTM D445;
- a specific gravity at 15.6° C. of at most 0.91, as measured by ASTM D1298;
- and an aniline point of at least 80° C., as measured by ASTM D611.
Dependencies are inferred from the claim text.