Method of purifying water

• US 10,610,860 B2
• Filed: 09/14/2016
• Issued: 04/07/2020
• Est. Priority Date: 09/15/2015
• Status: Active Grant

• Current Assignee: Ddp Specialty Electronic Materials Us, Inc. (DuPont de Nemours, Inc.)
• Original Assignee: Ddp Specialty Electronic Materials Us, Inc. (DuPont de Nemours, Inc.)
• Inventors: Slagt, J. Marcus, Schultz, Alfred K.
• Primary Examiner(s): Bernshteyn, Michael
• Application Number:
  US15/757,050
• Publication Number:
  US 20190314806A1
• Time in Patent Office: 1,301 Days
• Field of Search: 521 26
• CPC Class Codes: B01J 41/05 in the strongly basic form
• CPC Class Codes: B01J 41/14 obtained by reactions only involving unsaturated carbon-to-carbon bonds
• CPC Class Codes: B01J 47/028 with alternately arranged cationic and anionic exchangers
• CPC Class Codes: B01J 49/08 containing cationic and anionic exchangers in separate beds
• CPC Class Codes: B01J 49/57 for anionic exchangers
• CPC Class Codes: C02F 1/42 by ion-exchange ion-exchange in general B01J
• CPC Class Codes: C02F 2101/34 containing oxygen
• CPC Class Codes: C02F 2303/16 Regeneration of sorbents, filters

Abstract

Provided is a method of regenerating an acrylic resin (B2), comprising

• • (A) providing a collection of particles of acrylic resin (B2) that has calculated Hansch parameter of −1.0 to 2.5, wherein one or more humic acid, one or more fulvic acid, or a mixture thereof, is adsorbed onto said acrylic resin (B2), and
  • (B) bringing said collection of particles of acrylic resin (B2) into contact with an aqueous solution (RB) having pH of 10 or higher, to form a mixture B2RB,
  • (C) then separating acrylic resin (B4) from said mixture B2RB.

Claims

1. A method of regenerating an acrylic resin (B2), comprising

(A) providing a collection of particles of acrylic resin (B2) that has calculated Hansch parameter of from −

0.2 to 0.5, wherein one or more humic acid, one or more fulvic acid, or a mixture thereof, is adsorbed onto said acrylic resin (B2), and

(B) bringing said collection of particles of acrylic resin (B2) into contact with an aqueous solution (RB) having pH of 10 or higher, wherein said aqueous solution (RB) comprises metal cations, hydroxide anions, and non-hydroxide anions, to form a mixture B2RB, wherein said non-hydroxide anions are present in an amount of 0.5% or more by weight based on the weight of said aqueous solution (RB),

(C) then separating acrylic resin (B4) from said mixture B2RB.

2. The method of claim 1, wherein said aqueous solution (RB) has pH of 13 or higher.

3. The method of claim 1, wherein aqueous solution (RB) comprises, by weight based on the weight of said aqueous solution (RB):

(I) 1% to 10% a metal cation,

(II) 1% to 9% hydroxide ion, and

(III) 0.3% to 1.5% non-hydroxide anion.

4. The method of claim 3, wherein said metal cation is sodium cation.

5. The method of claim 3, wherein said non-hydroxide anion is chloride ion.

6. A method of regenerating an acrylic resin (B2) and a resin (D2), comprising

(AA) providing a collection of particles of acrylic resin (B2) that has calculated Hansch parameter of from −

0.2 to 0.5, wherein one or more humic acid, one or more fulvic acid, or a mixture thereof, is adsorbed onto said acrylic resin (B2),

(BB) providing a collection of particles of resin (D2) that is a strong base anion exchange resin, wherein one or more non-hydroxide anion is adsorbed onto said resin (D2),

(CC) bringing said collection of particles of resin (D2) into contact with an aqueous solution (RB) having pH of 10 or higher, to form a mixture RBD2,

(DD) separating aqueous solution (RB2) from said mixture RBD2,

(EE) bringing said collection of particles of acrylic resin (B2) into contact with said aqueous solution (RB2), to form mixture B2RB2, and

(FF) separating aqueous solution (RE) from said mixture B2RB2.