DIAION® chelating resin series
Blue_line.gif (2314 ???)
 

Blue_Bead.gif (953 ???) Chelating resins are ...

It is known that ions of transition and alkaline earth metals or some kinds of anionic species tend to form complexes by coordination with certain type of compounds called "ligand."
Chelating resins are designed to catch certain types of ions by this phenomena.   DIAION® chelating resins have such grades as follows:

CR11 for metallic ions, CR20 for transition metal ions and CRB02 for borate anion
 

Blue_Bead.gif (953 ???) DIAION® CR11

DIAION® CR11 has iminodiacetic acid group as chelating ligand which is bonded onto a highly porous crosslinked polystyrene matrix.  DIAION® CR11 shows large affinity for alkaline earth and transition metal ions, and the selectivity is similar to that of ethylene diamine tetra-acetic acid (EDTA).

The selectivity order of DIAION® CR11 for metal ions is as follows:

Cr3+ > In3+ > Fe3+ > Ce3+ > Al3+ > La3+ > Hg2+ > UO2+ > Cu2+ > VO2+ > Pb2+ > Ni2+ > Cd2+ > Cd2+ > Zn2+ > Co2+ > Fe2+ > Mn2+ > Be2+ > Ca2+ > Mg2+ > St2+

Adsorbed metal ions can be eluted with an acid, and the resin can be reused after  regeneration with caustic alkali.

The most typical application of DIAION® CR11 is the secondary purification of brine in chlor-soda electrolysis plants.  DIAION® can remove a small amount of alkaline earth metals (Ca2+, Mg2+, St2+) from a highly concentrated sodium chloride solution.
 

Blue_Bead.gif (953 ???) DIAION® CR20

DIAION® CR20 has polyamine group as chelating ligand which is bonded onto a highly porous crosslinked polystyrene matrix.   DIAION® CR20 shows large affinity for transition metal ions, but does not adsorb alkali, alkaline earth, and Sn·Zr·Th·Al·Fe(II) ions.

The selectivity order of DIAION® CR11 for metal ions is as follows:

Hg2+ > Fe3+ > Cu2+ > Zn2+ > Cd2+ > Ni2+ > Co2+ > Ag+ > Mn2+

Adsorbed metal ions can be eluted with an acid, and the resin can be reused after  regeneration with caustic alkali.
  

Blue_Bead.gif (953 ???) DIAION® CRB02

DIAION® CR CRB02 is a borate selective resin, and has N-methylglucamine group bonded onto a highly porous crosslinked polystyrene matrix. 
DIAION® CR CRB02 has strong affnity for borate anion, and can adsorb borate anion in the presence of other anion species.
 

Blue_Bead.gif (953 ???) Properties of DIAION® chelating resins (example)
Product DIAION
CR11		 DIAION
CR20		 DIAION
CRB02
Chemical structure Diaion_CR11table_J.gif (1704 ???)
Diaion_CRB02table_J.gif (1721 ???)
Apperance index > 95
Apparent density
(g/L-R)		 730 685 635
Ion-exchange capacity
(meq/mL-R)
Cu adsorption capacity
(mmol/mL-R)
--

> 0.5
--

> 0.4
> 0.6

--
Water content
(%)		 55-65 50-60 50-60
Particle size distribution
> 1180 mm
< 355 mm
< 300 mm
< 5 %
< 2 %
--
< 5 %
--
< 1 %
--
--
< 1 %
Effective size
(mm)		 > 0.40 > 0.40 > 0.35
Uniformity coefficient < 1.6 < 1.6 < 1.6
 

Button_Diaion_E.jpg (2462 ???)Button_Appls_E.jpg (2268 ???)Button_DiaList_E.jpg (2214 ???)
Button_Sepabeads_E.jpg (2274 ???)Button_MCIGEL_E.jpg (2191 ???)Button_TopPage_E.jpg (1778 ???)
 


For questions and comments, please click here.
Last updated: 30 September 2000.  ©copyright Mitsubishi Chemical Corporation.