| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 01.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
Process for deionization & demineralization - Loading a tris(hydroxymethyl)aminomethane ("Tris") buffer onto first weakly acidic cation exchange resin to occupy cation exchange sites & form first bed comprising first amine buffered resin - Passing ion-contg water through said first bed & exchanging water cations for amine cations to form first effluent compri sing an anion-buffer salt complex (I) - Passing (I) through first weakly basic anion exchange resin comprising an aliphatic polyamine ion exchange resin having an active site d. > 2.5 meq/ml (water swollen bead form), where an anion portion of (I) is split from (I) by adsorption of said anion portion onto said weakly basic anion exchange resin to form second effluent comprising buffer in free hydrated base form (II) - Passing (II) to second weakly acidic cation exchange resin where said buffer loads onto said second resin as in first step & repeating first 4 steps - Regenerating said first weakly acidic cation exchange resin with an organic acid to reestablish said first weakly acidic cation exchange resin to H form & to form spent organic acid regenerant comprising mixt of cation salts of organic acid regenerant & free organic acid regenerant - Regenerating said first weakly basic anion exchange resin with organic base to reestablish said resin to free hydrated base form & to form a spent organic base regenerant com prising mixt of anion salts of organic base regenerant & free organic base regenerant |
| PATENT PHOTOCOPY | Available on request |
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