Method for the manufacture of compositions containing low...

Details Method for the manufacture of compositions containing low... Method for the manufacture of compositions containing low...

2005-02-08

2005-02-08

Therkorn, Ernest G. (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S656000, C210S198200, C530S413000, C530S416000, C530S417000

Reexamination Certificate

active

06852230

ABSTRACT:
Method for desalting an aqueous liquid containing a charged substance comprising the steps of: (i) contacting liquid (I) with an ion-exchanger (1) under conditions permitting binding between ion-exchanger and substance, said ion-exchanger comprising a base matrix carrying an ion-exchange ligand (Ligand 1) with the opposite charge compared to the substance, (ii) desorbing said substance from said ion-exchanger by the use of a liquid (liquid (II)). Wherein: (A) ion-exchanger (1) is an ion-exchanger: (a) that can bind the substance in an aqueous reference liquid at ionic strength corresponding to 0.1 M NaCl, preferably 0.25 M NaCl; and (b) permits a breakthrough capacity at the pH provided by liquid (I) which is more than 2 mg/ml of gel, at a breakthrough of 10% and linear flow velocity of 300 cm/h; and (B) in step (ii) the pH of liquid (11) is adjusted to a pH value where the charge difference between the substance, the ligand and/or the ion-exchanger is lowered.

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patent: 5652348 (1997-07-01), Burton et al.
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patent: WO0069872 (2000-11-01), None
patent: WO0138227 (2001-05-01), None
patent: WO0205959 (2002-01-01), None

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