The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 1983
Filed:
Aug. 18, 1981
Norsk Hydro a.s., Oslo, NO;
Abstract
The invention relates to a method and apparatus for enriching compounds almost insoluble in water, particularly chlorinated hydrocarbons, and thereby removing them from aqueous suspensions of solid particles contaminated by such compounds. The aqueous suspension is brought in contact with an organic hydrocarbon containing solvent, and the suspension is extracted with the organic solvent in one or more mixing stages with subsequent phase separation. Each stage comprises one or more mixing sequences in series arranged upstream of a phase separation and from where a substantial part of the organic solvent is recirculated to the first mixing sequence within that stage. The invention secures nearly complete leaching of compounds present in even less than 10% of other solid particles in an aqueous suspension.