INDUSTRIAL MIXED BED DEIONISER
Product Description
There are four distinct stages in the operation of an industrial mixed-bed deioniser:
Backwashing
Regeneration
Product Description
INDION Industrial Mixed
Bed Deionisers are designed to produce high purity treated water
required by the pharmaceuticals and electronic industries. These
deionisers can be used as polishing units after two bed deionisers or
directly to obtain high purity water. Mixed Bed Deionisers are single
column units, filled with strongly acidic cation and strongly basic
anion exchange resins mixed together evenly. Dissolved solids in the
water are thus removed, producing water of very high quality -
confirming to IP specifications of purified water. The treated water,
however is not free from bacteria and pyrogen.
Working principleThere are four distinct stages in the operation of an industrial mixed-bed deioniser:
- Service/exhaustion
- Backwashing
- Regeneration
- Rinse/remix
Backwashing
Once the resins are
exhausted, the bed is backwashed. Backwashing is initiated by
introducing a uniform upward flow of water through the resin bed. The
backwash step serves two important functions:
Firstly, it expands the resin bed releasing any entrapped particulate matter and resin fines.
Secondly, the backwash flow separates the denser
cation resin from the lighter anion resin, forming two distinct layers
in the vessel.
Regeneration
The first stage in the
process of regeneration involves passing a dilute solution of acid,
usually hydrochloric, through the cation bed. After the cation resin has
been regenerated,the anion resin is regenerated by passing a dilute
solution of caustic (sodium hydroxide) through the anion resin bed. As a
result, the cation resin is reconverted to the hydrogen form and the
anion resin to the hydroxyl form.
In-situ Regeneration
Rinse / Remix
The final stage of regeneration is to rinse the resins of excess regenerant and then remix with air.
Advantages
- Easy to install
- Simple to operate
- Complete with regeneration equipment and control
- Produces deionised water of very high purity, confirming to IP specifications.
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