Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1992-07-27
1994-08-16
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210638, B01D 1104
Patent
active
053384539
ABSTRACT:
In one aspect this invention includes a method for recovering phenols from a mixture containing hydrocarbons and/or oxygenated hydrocarbons having a boiling point greater than that of the phenol and at least about 1 part per million by weight of at least one phenol comprising, (a) admixing the mixture with sufficient lower molecular weight hydrocarbon solvent to reduce the surface tension of the mixture and (b) contacting the resulting admixture with an aqueous solution of inorganic base such that at least a portion of the phenols are extracted into the aqueous solution. It is found that when recovering phenol from a waste stream which contains in addition to the phenol, a substituted phenol, for example cumyl phenols, extraction with the aqueous phase produces an emulsion. formation of which is reduced or eliminated by use of the lower molecular weight solvent. Reduced emulsion facilitates the unit operation and results in less phenate salt being lost with the emulsion in the organic phase.
REFERENCES:
patent: 2757209 (1936-07-01), Joris
patent: 3963610 (1976-06-01), Hauschulz et al.
patent: 4418222 (1983-11-01), Honnen
patent: 4973766 (1990-11-01), Penzo et al.
Fraini Edward A.
Tepera George W.
Spear Frank
The Dow Chemical Company
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