Method for determining degree of sludge generation in oil
US11988657B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2019 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Mar 6, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the degree of sludge generation in oil includes: a deteriorated oil generating step ST1; a RPVOT testing step ST2; a sludge amount measuring step ST2B; and a determining step ST3. The step ST1 generates deteriorated oil oxidized by immersing and rotating a pressurized container in a thermostatic bath having a predetermined temperature. The pressurized container is pressurized until the oxygen partial pressure reaches a predetermined pressure higher than the value under atmospheric pressure by adding oil and a copper catalyst, substituting with oxygen, or injecting oxygen or air. The step ST2A measures an RPVOT residual ratio of a portion of generated deteriorated oil by the RPVOT test. The step ST2B measures the amount of sludge for a portion of generated deteriorated oil. The step ST3 determines the ease of sludge generation from the relationship between the measured RPVOT residual ratio and the amount of sludge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.