Agitated heat exchanger to chill solvent-oil and wax slurry to wax filtration temperature
US4502787A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Dec 5, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G73/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved process for dewaxing waxy hydrocarbon oils, wherein said waxy oil is introduced at a temperature above its cloud point into a direct chilling zone divided into a plurality of stages, passing said waxy oil from stage-to-stage of said chilling zone, introducing a cold dewaxing solvent into at least a portion of said stages, maintaining a high degree of agitation in at least a portion of the stages containing solvent and waxy oil, thereby effecting substantially instantaneous mixing thereof while cooling said solvent-waxy oil mixture, preferably at a rate of from about 1.degree. to 8.degree. F./min., as it progresses through said direct chilling zone to a temperature greater than the wax separation temperature, whereby a substantial portion of the wax is precipitated from said waxy oil under conditions of said high degree of agitation and forming a solvent-oil mixture containing precipitated wax (slurry I), withdrawing said slurry I from said direct chilling zone and cooling same to the wax separation temperature in an indirect chilling zone thereby precipitating a further portion of wax from said waxy oil and separating said precipitated wax from the wax-oil-solvent mixtu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.