Process for treating refinery slurries

Details Process for treating refinery slurries Process for treating refinery slurries

1991-09-24

1992-08-04

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210671, 210774, 210634, B01D 1104

Patent

active

051356554

ABSTRACT:
Disclosed is a process for treating a refinery slurry containing water, oil and a solid fraction, wherein the slurry is brought into contact with carbon dioxide gas in order to adjust the pH value of said slurry to an acidic value and, in that way, improve the separation, by mechanical means, of a first water phase and a first oil phase, from a sludge. The latter is submitted to an extraction with carbon dioxide, under supercritical conditions, in order to separate a second water phase and a second oil phase from a residual sludge, which is disposed of.
The process makes it possible to remove most of the water, and, in particular, most of the oil contained in said slurry and a sludge to be disposed of which shows a reduced propensity to the elution of the residual oil.

REFERENCES:
patent: 3716474 (1973-02-01), Hess et al.

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