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Title: Separations by supported liquid membrane cascades

Abstract

The invention describes a new separation technique which leads to multi-stage operations by the use of a series (a cascade) of alternated carrier-containing supported-liquid membranes. The membranes contain alternatively a liquid cation exchanger extractant and a liquid anion exchanger extractant (or a neutral extractant) as carrier. The membranes are spaced between alternated aqueous electrolytic solutions of different composition which alternatively provide positively charged extractable species and negatively charged (or zero charged) extractable species, of the chemical species to be separated. The alternated aqueous electrolytic solutions in addition to providing the driving force to the process, simultaneously function as a stripping solution from one type of membrane and as an extraction-promoting solution for the other type of membrane. The aqueous electrolytic solutions and the supported liquid membranes are arranged in such a way to provide a continuous process which leads to the continuous enrichment of the species which show the highest permeability coefficients. By virtue of the very high number of stages which can be arranged, even chemical species having very similar chemical behavior (and consequently very similar permeability coefficients) can be completely separated. The invention also provide a way to concentrate the separated species.

Inventors:
 [1]
  1. Clarendon Hills, IL
Issue Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
866015
Patent Number(s):
4617125
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
separations; supported; liquid; membrane; cascades; describes; separation; technique; leads; multi-stage; operations; series; cascade; alternated; carrier-containing; supported-liquid; membranes; contain; alternatively; cation; exchanger; extractant; anion; neutral; carrier; spaced; aqueous; electrolytic; solutions; composition; provide; positively; charged; extractable; species; negatively; zero; chemical; separated; addition; providing; driving; force; process; simultaneously; function; stripping; solution; type; extraction-promoting; arranged; continuous; enrichment; permeability; coefficients; virtue; stages; similar; behavior; consequently; completely; concentrate; positively charged; negatively charged; cation exchanger; stripping solution; electrolytic solution; supported liquid; cation exchange; anion exchange; chemical species; liquid membrane; continuous process; chemical specie; driving force; aqueous electrolytic; liquid membranes; membranes contain; separation technique; stage operation; /210/

Citation Formats

Danesi, Pier R. Separations by supported liquid membrane cascades. United States: N. p., 1986. Web.
Danesi, Pier R. Separations by supported liquid membrane cascades. United States.
Danesi, Pier R. Wed . "Separations by supported liquid membrane cascades". United States. https://www.osti.gov/servlets/purl/866015.
@article{osti_866015,
title = {Separations by supported liquid membrane cascades},
author = {Danesi, Pier R},
abstractNote = {The invention describes a new separation technique which leads to multi-stage operations by the use of a series (a cascade) of alternated carrier-containing supported-liquid membranes. The membranes contain alternatively a liquid cation exchanger extractant and a liquid anion exchanger extractant (or a neutral extractant) as carrier. The membranes are spaced between alternated aqueous electrolytic solutions of different composition which alternatively provide positively charged extractable species and negatively charged (or zero charged) extractable species, of the chemical species to be separated. The alternated aqueous electrolytic solutions in addition to providing the driving force to the process, simultaneously function as a stripping solution from one type of membrane and as an extraction-promoting solution for the other type of membrane. The aqueous electrolytic solutions and the supported liquid membranes are arranged in such a way to provide a continuous process which leads to the continuous enrichment of the species which show the highest permeability coefficients. By virtue of the very high number of stages which can be arranged, even chemical species having very similar chemical behavior (and consequently very similar permeability coefficients) can be completely separated. The invention also provide a way to concentrate the separated species.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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