Non-agglomerating mixed bed ion exchangers

Abstract

The invention relates to a process for producing non-agglomerating mixed bed ion exchangers or mixed bed components.

1 . A process for producing non-agglomerating readily separable mixed bed ion exchangers or mixed bed components, wherein the anion exchange component, before or after mixing with the cation exchange component, is treated with a condensate of one or more aromatic sulphonic acids in the application concentrations of 10 mg/litre of resin to 100 g/litre of resin. 
   
   
       2 . A process according to  claim 1 , wherein the sulphonic acids for producing the condensates are phenolsulphonic acid, sulphonated ditolyl ether, 4,4′-dihydroxydiphenyl-sulphone, sulfonated diphenylmethane, sulfonated biphenyl, sulfonated terphenyl, naphthalenesulphonic acids or benzenesulphonic acids. 
   
   
       3 . A process according to  claim 2 , wherein methylene-bridged naphthalenesulphonic acids [NSSK] are used as naphthalenesulphonic acid. 
   
   
       4 . A process according to  claim 1 , wherein the sulphonic acids are condensed with aldehydes or ketones. 
   
   
       5 . A process according to  claim 1 , wherein the polyanionic component is applied to the anion exchanger in the batch. 
   
   
       6 . A process according to  claim 1 , wherein for producing mixed beds, the anion exchanger is treated before regeneration of the anion exchanger and before mixing with the cation exchange component. 
   
   
       7 . A process according to  claim 1 , wherein the sulphonic acid condensates have a molar weight of >1000 g/l. 
   
   
       8 . A process according to  claim 1 , wherein salt is added in treatment of the anion exchange component. 
   
   
       9 . A process according to  claim 8 , wherein the salt added is an alkaline earth metal salt. 
   
   
       10 . A method of using of condensates of one or more aromatic sulphonic acids in the application concentrations of 10 mg/litre of resin to 100 g/litre of resin for producing non-agglomerating, readily separable mixed bed ion exchangers or mixed bed components by treating the anion exchange component before or after it was mixed with the cation exchange component.