Wax separation process
US4206034A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1978 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Sep 29, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G31/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Particles of solid wax are separated from a slurry comprising said wax particles and a hydrocarbon oil by filtering the slurry through a cloth filter medium. It has been found that using, as the filter medium, a needled-felt cloth fabricated from fibers fusible by means of an open flame and having a singed surface on which the wax is collected results in an unexpected reduction in filter cloth blinding thereby yielding up to 30% increased throughput through the filter cloth and greatly reducing the frequency of washing the filter cloth. The cloth is further characterized in that it has a permeability to air in excess of about 3 cubic feet per minute per square foot of cloth surface at a differential pressure of 0.5 inches of water, a root mean square surface roughness in excess of 500 rms microinches and a fouling factor in excess of about 75%. This improved process has been found to be particularly useful for separating wax particles from a dewaxed lube oil slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.