Title: Process for separating and recovering an anionic dye from an aqueous solution

Abstract

A solid/liquid phase process for the separation and recovery of an anionic dye from an aqueous solution is disclosed. The solid phase comprises separation particles having surface-bonded poly(ethylene glycol) groups, whereas the aqueous solution from which the anionic dye molecules are separated contains a poly(ethylene glycol) liquid/liquid biphase-forming amount of a dissolved lyotropic salt. After contact between the aqueous solution and separation particles, the anionic dye is bound to the particles. The bound anionic dye molecules are freed from the separation particles by contacting the anionic dye-bound particles with an aqueous solution that does not contain a poly(ethylene glycol) liquid/liquid biphase-forming amount of a dissolved lyotropic salt to form an aqueous anionic dye solution whose anionic dye concentration is preferably higher than that of the initial dye-containing solution.

Inventors:

Rogers, Robin ^[1]; Horwitz, E Philip ^[2]; Bond, Andrew H ^[3]

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+ Show Inventor Affiliations

1. DeKalb, IL
2. Naperville, IL
3. Tallahassee, FL

Issue Date:

Tue Jan 13 00:00:00 EST 1998

Research Org.:

Argonne National Laboratory (ANL), Argonne, IL (United States)

OSTI Identifier:

871323

Patent Number(s):

5707525

Assignee:

Arch Development Corp. (Chicago, IL); Northern Illinois University (DeKalb, IL)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D15/08 - Selective adsorption, e.g. chromatography

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J20/3204 - {Inorganic carriers, supports or substrates}
B01J20/321 - {consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds}
B01J20/3212 - {consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds}
B01J20/3219 - {involving a particular spacer or linking group, e.g. for attaching an active group}
B01J20/3227 - {by end-capping, i.e. with or after the introduction of functional or ligand groups}
B01J20/3272 - {Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds}
B01J20/3276 - {Copolymers}
B01J20/3278 - {Polymers being grafted on the carrier}

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DOE Contract Number:  

W-31109-ENG-38

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

process; separating; recovering; anionic; dye; aqueous; solution; solid; liquid; phase; separation; recovery; disclosed; comprises; particles; surface-bonded; poly; ethylene; glycol; molecules; separated; contains; biphase-forming; amount; dissolved; lyotropic; salt; contact; bound; freed; contacting; dye-bound; contain; form; concentration; preferably; initial; dye-containing; separation particles; anionic dye; ethylene glycol; aqueous solution; liquid phase; solid phase; dye molecules; phase process; separated contains; surface-bonded poly; comprises separation; dye solution; biphase-forming amount; liquid biphase-forming; containing solution; /210/