Regeneration of anion exchange resins
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Claims
2. The method as defined in claim 1 wherein said monovalent anion form is the chloride form.
3. The method as defined in claim 1 wherein said polyvalent anions are divalent anions.
4. The method as defined in claim 3 wherein said divalent anions are sulfate anions.
5. The method as defined in claim 1 wherein said alkali metal hydroxide is sodium hydroxide.
6. The method as defined in claim 5 wherein said sodium hydroxide has a concentration in the range of 3.5 to 5.0 normal.
8. The method as defined in claim 7 wherein a first portion of said effluent is neutralized, and further comprising the steps of storing a second portion of said effluent alkali metal hydroxide solution; and passing said effluent alkali metal hydroxide solution through said second batch of resin after said neutralized effluent.
9. The method as defined in claim 8 further comprising the step of passing a fresh alkali metal hydroxide solution through said resin after said effluent alkali metal hydroxide.
10. A method for converting strong-base anion exchange resin having quaternary ammonium groups from the chloride form to the hydroxide form comprising: passing a solution of sodium sulfate having a concentration not exceeding 0.5 normal through a first batch of said resin to displace said chloride ions with sulfate ions; subsequently passing a solution of sodium hydroxide through said resin in an amount sufficient to convert said resin to the hydroxide form, and to produce an effluent comprising a solution of sodium hydroxide; neutralizing said effluent with sulfuric acid, whereby to form a neutralized effluent solution of sodium sulfate; and passing said neutralized effluent solution through a second batch of said resin to convert said second batch to the sulfate form.
11. The method as defined in claim 10 further comprising the steps of storing a second portion of said effluent sodium hydroxide solution; passing said second portion of said effluent sodium hydroxide solution through said second batch of resin after passing said neutralized effluent through said resin; and subsequently passing a fresh sodium hydroxide solution through said second batch of said resin.
| 2723245 | November 1955 | Wheaton |
- Gorshkov et al., Zh. Fiz. Khim., 1968, pp. 1992-1997. Toma et al., Ind. Aliment. 28 (1), pp. 35-36 (1967).
Type: Grant
Filed: Nov 29, 1972
Date of Patent: Jun 27, 1978
Assignee: Ecodyne Corp. (Chicago, IL)
Inventors: Eli Salem (Brooklyn, NY), Donald J. Butterworth (Lyndhurst, NJ), Leo F. Ryan (Sommerville, NJ)
Primary Examiner: Harold D. Anderson
Law Firm: Hume, Clement, Brinks, Willian & Olds, Ltd.
Application Number: 5/310,383
International Classification: C08J 520;
