초록

(e) Regenerating said first weakly acidic cation exchange resin with an organic acid.

대표청구항 ▼

[ We claim:] [9.] A process for deionization and demineralization of a fluid containing ions comprising:(a) Loading an amine or ammonia buffer comprising tris(hydroxymethyl)aminomethane ("Tris") onto a first weakly acidic cation exchange resin to occupy cation exchange sites and to form a first bed

[ We claim:] [9.] A process for deionization and demineralization of a fluid containing ions comprising:(a) Loading an amine or ammonia buffer comprising tris(hydroxymethyl)aminomethane ("Tris") onto a first weakly acidic cation exchange resin to occupy cation exchange sites and to form a first bed comprising a first amine-buffered resin;(b) Passing said fluid containing ions through said first bed comprising said first amine-buffered resin and exchanging cations of said fluid for amine cations of said first amine-buffered resin to form a first effluent comprising an anion-buffer salt complex;(c) Passing said anion-buffer salt complex through a first weakly basic anion exchange resin comprising an aliphatic polyamine ion exchange resin having an active site density of at least about 2.5 meq/ml (water swollen bead form), where an anion portion of said anion-buffer salt complex is split from said anion-buffer salt complex by adsorption of said anion portion onto said weakly basic anion exchange resin to form a second effluent comprising buffer in free hydrated base form;(d) Passing said buffer in free hydrated base form to a second weakly acidic cation exchange resin where said buffer loads onto said second weakly acidic cation exchange resin as in step (a) and repeating the process of steps (b)-(d);(e) Regenerating said first weakly acidic cation exchange resin with an organic acid to reestablish said first weakly acidic cation exchange resin to hydrogen form and to form a spent organic acid regenerant comprising a mixture of cation salts of the organic acid regenerant and free organic acid regenerant; and(f) Regenerating said first weakly basic anion exchange resin with an organic base to reestablish said first weakly basic anion exchange resin to free hydrated base form and to form a spent organic base regenerant comprising a mixture of anion salts of said organic base regenerant and free organic base regenerant.