Laboratory Experiments Using Ion-Exchange Resins; Experimental Setup; Storage Of The Resins; Use Of The Resins For Water-Free Applications - ELECTOR PUREval MX-G Manuel De L'utilisateur

PUREval MX-G
Chapter 4 - Laboratory experiments using ion-exchange resins
The laboratory test with ion-exchange resins is used to develop or optimize industrial processes. For
this reason, the experimental operation of the laboratory ion-exchange system should simulate the real
operating conditions as well as possible.

4.1 Experimental setup

Depending on the purpose of the experiment, the ion-exchange column can either be operated
according to the gravity principle or with pumps.
If the ion-exchange column is operated according to the gravity principle, the supply hose should be
laid in a U-shape so that the lowest point of the hose bend is just above the resin bed. This prevents
the resin bed from drying out. The use of pumps allows a comfortable and realistic test procedure.
Regardless of the operating mode, sufficient process fluid, regeneration agent and fully demineralized
water should be provided.

4.2 Storage of the resins

If the ion-exchange resins are to be stored before the experiment is carried out, seal the storage
container tightly against the atmosphere and do not allow the resins to dry out. Avoid direct sunlight
and warm or cold temperatures.

4.3 Use of the resins for water-free applications

If the resins are to be used in an anhydrous application area, the resins must be provided in dry form
for best results. This avoids contamination of the treated product with water. Resin samples that you
have received in hydrogenated form should be pretreated with suitable solvents such as acetone or
alcohol, insofar as the specific process allows.

4.4 Rinsing

The resins should always be rinsed with deionized water before use in order to remove washable
production and regeneration residues. In most applications, 5 - 10 bed volumes are sufficient.

4.5 Pretreatment

Before performing the laboratory test, ion-exchange resins should be pretreated so that complete
hydrogenation and swelling of the polymer is ensured. Unless otherwise required for technical
reasons, the polymer should always be completely swollen and soaked.
Ion-exchange resins should never be filled into a dry column. About half or a third of the column
should be filled with deionized water before the pretreated ion-exchange resin is poured into the
column.
Depending on the ion-exchange column used, the bed height should at least correspond to the
position of the calibration mark.
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