Process for petroleum - wax separation at or above room temperature
US5196116A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G73/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There are disclosed processes for separating waxes of different melting points from a room temperature amorphous or liquid hydrocarbon mixture in an energy conservative manner by selectively causing precipitation of crystallized waxes. The processes involve the use of a selected co-solvent totally miscible with light and intermediate hydrocarbons from a group consisting of acetone, ketene, propanone, 2-propanone, methanol, ethanol, isopropanol, N-propanol, acetic acid, formic acid, and propionic acid or combinations thereof as a precipitating agent. Hydrocarbon mixtures, especially those with elevated pour points are first diluted by solvents such as toluene and/or methylethyl ketone which must be free of any significant quantity of the aforesaid co-solvents. The diluted hydrocarbon mixture at above 50 degrees F. is mixed with one or more of such selected co-solvents in a ratio preferably between 1:1 and 10:1 by weight to the heavy hydrocarbon content of the mixture; five minutes or more without artificial cooling is allowed to permit crystallization of waxes which are removed in solid form by a physical process such as filtering, settling, or the like. By controlling the amount an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.