Production of transformer oil feed stocks from waxy crudes
US4124489A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1977 |
| Grant date | Nov 7, 1978 |
| Priority date | — |
| Expiry date | Feb 16, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2400/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Transformer oil feedstocks are produced by double solvent extracting a raw, untreated, light distillate fraction from a waxy crude oil to produce a second, wax-containing extract. The second extract oil is hydrotreated to mildly crack same, reduce the sulfur content and improve the viscosity oxidation and color stability thereof. This hydrotreated oil is then distilled to produce a transformer oil feedstock of relatively low wax content as a heart cut fraction having a 5 to 95 LV% boiling range between about 595.degree. to 750.degree. F. The transformer oil feedstock may then be dewaxed using any well known method such as solvent or catalytic dewaxing to obtain a low pour point transformer oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.