Sample Testing Process Parameters

Preparing the Resin Sample

Storage and Preconditioning

Before running a laboratory test, the sample needs to be conditioned to ensure full swelling and hydration of the resin. Unless otherwise advised, the resin must be soaked.

When samples are sent out from Purolite, the resin is taken directly from production batches or warehouse stock. If the resin is stored before testing, make sure the containers are not left open to the atmosphere or allowed to dry out. Keep resin storage containers away from strong sunlight and hot or cold temperatures.

Ion exchange resin stored for any length of time will require rinsing with demineralized water to reduce leachables before trials can be performed. In many applications, 5–10 bed volumes should be sufficient. High-purity applications may require different preparation. Please contact your regional Purolite sales office for assistance.

Resin Volume

Approximately 370-380 ml of resin is sufficient for an initial test of a single resin bed. If the inlet load is very low, it will require a large amount of solution to be processed through the bed to reach exhaustion and greatly increase the time it takes to complete each test.

Loading

Fill 1/2 to 1/3 of the column in advance with deionized water, then transfer the pretreated ion exchange resin into the column. Maintain a minimum total bed depth of 760 mm (372 ml in described apparatus) for the trial. In most applications, the process will improve if the bed depth is increased. Do not load ion exchange resin into a dry column. Do not use the above procedure for mixed beds.