The object of the present invention is a method for recirculating a reprocessing effluent comprising chloride ions from an ion exchange resin comprising the following steps: (ii) selecting fractions A, B, and optionally B, directly stemming from a reprocessing effluent comprising chloride ions or after one or several steps for modifying the chloride ion concentration, having concentrations of chloride ions (g/l) of respectively (a), (b) and (b)>0 g/l, with (a)>(b); (iii) transferring by electrodialysis the chloride ions from the fraction B to fraction A for obtaining a fraction C having a chloride ion concentration (c) greater than (a); or (iv) transferring by electrodialysis the chloride ions from fraction B to fraction B, in order to obtain a fraction B having a concentration of chloride ions (b) greater than (b) and then mixing the fractions B and A in order to obtain a fraction C having a chloride ion concentration (c) greater than (a).

The object of the present invention is a method for recirculating a reprocessing effluent comprising chloride ions from an ion exchange resin comprising the following steps: (ii) selecting fractions A, B, and optionally B, directly stemming from a reprocessing effluent comprising chloride ions or after one or several steps for modifying the chloride ion concentration, having concentrations of chloride ions (g/l) of respectively (a), (b) and (b)>0 g/l, with (a)>(b); (iii) transferring by electrodialysis the chloride ions from the fraction B to fraction A for obtaining a fraction C having a chloride ion concentration (c) greater than (a); or (iv) transferring by electrodialysis the chloride ions from fraction B to fraction B, in order to obtain a fraction B having a concentration of chloride ions (b) greater than (b) and then mixing the fractions B and A in order to obtain a fraction C having a chloride ion concentration (c) greater than (a).

A sandwich suppressor in an ion chromatography system in which loosely packed ion exchange resin of low density is disposed in the central sample stream flow channel. Also, a method of using the suppressor is described.

A sandwich suppressor in an ion chromatography system in which loosely packed ion exchange resin of low density is disposed in the central sample stream flow channel. Also, a method of using the suppressor is described.

An ion exchanger includes a sheet-shaped positive ion exchanger 2 in which binder particles 5 and positive ionic exchange resin particles 4 are mixed with each other, and a sheet-shaped porous negative ion exchanger 3 in which binder particles 7 and negative ionic exchange resin particles 6 are mixed with each other, the positive ion exchanger 2 and the negative ion exchanger 3 are bonded to each other to form an interface, and capacity of the negative ion exchanger 3 is greater than that of the positive ion exchanger 2. Therefore, the porous ion exchanger 1 is formed and absorbing ability of ion is increased, capacity of the negative ion exchanger 3 is made greater than that of the positive ion exchanger 2, regenerating ability of the ion exchanger with respect to absorbing ability of ion can be secured, and ion absorption and regeneration processing is carried out efficiently.

An ion exchanger includes a sheet-shaped positive ion exchanger 2 in which binder particles 5 and positive ionic exchange resin particles 4 are mixed with each other, and a sheet-shaped porous negative ion exchanger 3 in which binder particles 7 and negative ionic exchange resin particles 6 are mixed with each other, the positive ion exchanger 2 and the negative ion exchanger 3 are bonded to each other to form an interface, and capacity of the negative ion exchanger 3 is greater than that of the positive ion exchanger 2. Therefore, the porous ion exchanger 1 is formed and absorbing ability of ion is increased, capacity of the negative ion exchanger 3 is made greater than that of the positive ion exchanger 2, regenerating ability of the ion exchanger with respect to absorbing ability of ion can be secured, and ion absorption and regeneration processing is carried out efficiently.

A quaternary ammonium group-grafted cation resin and a preparation method thereof are provided. The preparation method includes: adding a chloromethylated cross-linked polystyrene (PS) resin, trimethylamine hydrochloride, and a 20% sodium hydroxide aqueous solution successively to a reactor for a reaction under stirring at 30 C. to 40 C.; filtering a resulting reaction solution, followed by washing and drying to obtain a quaternary ammonium group-grafted resin; adding the quaternary ammonium group-grafted resin, 1,2-dichloroethane, silver sulfate, concentrated sulfuric acid, and fuming sulfuric acid successively for a reaction for 1 hour at 50 C. to 60 C., a reaction for 1 hour at 70 C. to 80 C., and a reaction for 5 hours at 115 C. to 125 C.; and cooling a resulting reaction solution to room temperature, followed by diluting, filtering, washing and drying to obtain the quaternary ammonium group-grafted cation resin.

A quaternary ammonium group-grafted cation resin and a preparation method thereof are provided. The preparation method includes: adding a chloromethylated cross-linked polystyrene (PS) resin, trimethylamine hydrochloride, and a 20% sodium hydroxide aqueous solution successively to a reactor for a reaction under stirring at 30 C. to 40 C.; filtering a resulting reaction solution, followed by washing and drying to obtain a quaternary ammonium group-grafted resin; adding the quaternary ammonium group-grafted resin, 1,2-dichloroethane, silver sulfate, concentrated sulfuric acid, and fuming sulfuric acid successively for a reaction for 1 hour at 50 C. to 60 C., a reaction for 1 hour at 70 C. to 80 C., and a reaction for 5 hours at 115 C. to 125 C.; and cooling a resulting reaction solution to room temperature, followed by diluting, filtering, washing and drying to obtain the quaternary ammonium group-grafted cation resin.