Patent · US Expired

Liquid-liquid extraction process

US4787979A · kind A · utility

7Cited by

1References

20Claims

0Family size

Assignee

Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

Zdenek Kolarik · Karlsruhe, DE
Ulrich Galla · Neuthard, DE
Klaus Roth · Ofterdingen, DE

Key dates

Filing date	Dec 16, 1986
Grant date	Nov 29, 1988
Priority date	—
Expiry date	Dec 16, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/50
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A liquid-liquid two-phase extraction process in which a feed solution is introduced into an intermediate stage of a multistage extraction apparatus. The solution is water and one or more valuable material to be recovered by extraction. An organic extractant is introduced into one end of the apparatus. The extractant is a solvent and flows through the apparatus. The valuable material is extracted from the feed solution to provide a charged organic phase. An aqueous extractant having water is introduced into another end of the apparatus to wash the charged organic phase. The aqueous extractant flows through the multistate extraction apparatus countercurrent to the extractant and contributes to the aqueous phase. The organic extractant is divided into at least two streams prior to introducing the organic extractant into the apparatus. Each stream is introduced into the apparatus at different stages, both ahead of the intermediate stage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.