Purolite Ion Exchange Resin Selection Guide
Cheapest softening resin for domestic softeners, cartridges, and small industrial units. Has lowest resistance to oxidative attack, but is more open structure offers excellent kinetic performance. The E suffix indicates the resin is a Purolite food grade product.
This is the most widely used Purolite softening resin. This product is used in a wide range of softening applications from domestic through to large industrial units. The E suffix indicates the resin is a Purolite food grade product. Has been used as a food grade demin cation resin on small IWT plants.
This industrial grade product was traditionally called a premium grade softening resin. Due to its higher strength it can be used in softening and demineralisation and offers excellent physical strength over a wide range of operating conditions. With its higher DVB content it offers a higher capacity and a greater resistance to oxidative attack by chlorine compared to C120E/C100E.
The Purofine trade name indicates that these are narrow grade versions of our Purolite C100E. The absence of large beads gives these resins enhanced physical strength, and its more uniform grading offers lower rinse water requirements and lower pressure loss in service. This resin is popular as it also offers a higher working capacity as the reduced diffusion path means more sites are regenerated and at low regeneration levels these resins offer significantly higher working capacity compared to their standard grade counterparts. This grading can also be used in all counter flow regenerated systems.
The Puropack trade name indicates that these are narrow grade versions of our Purolite C100. Like the Purofine PFC100E the absence of large beads gives these resins enhanced physical strength, and improved as outlined for PFC100E but has a higher resistance to oxidative attack than PFC100E. It has also been used in high flow rate softeners where the load is small and the bed volume per hour rate is high. This grading can also be used in all counter flow regenerated systems but the grading is slightly different to Purofine as it has been selected to give optimum performance in counter flow regenerated packed bed systems employing either up flow or down flow service.
This version of Purolite C100E is a softening resin to which a small quantity of silver is present. This gives the resin some bacteriostatic properties which help to prevent the build up of bacteria and organic growth on the beads. All ion exchange resins have the potential to be breeding ground for bacteria etc. particularly where the bed is in intermittent use or where it has long periods out of service, particularly if the water or softener becomes warm.
This is the most robust of all the softening resins and is normally recommended when very high temperatures and or where thermal shock is likely (*Note: Purolite C100 and PFC100 have also seen successful operation in hot softening). Its macroporous structure ensures that the effect of thermal shock resulting in premature breakdown when moving from high service temperatures to lower regeneration water temperatures is minimised. Due to its significantly higher DVB content this resin offers the greatest resistance to attack by chlorine of all the resins referred to in this summary.
This weak acid cation resin has replaced Purolite C105 and is now the main weak acid cation resin used for dealkalisation. It is a direct replacement for Purolite C105 and can be mixed with C105. The product is mainly used as a standard grade product but can be supplied in special grades for specific applications. For example our DL grade (Purolite C104DL) is used where the resin works in a double layer (stratified) unit. There the resin sits on top of a DL grade of a strong acid cation resin. This is most commonly encountered in a demineralisation plant but we have supplied DL grade weak acid cation resins to work with a strong acid cation softening resin (Purolite Cl00DL) as a combined dealkalisation / softener unit. This unit is regenerated with acid first and then brine.
This is a food grade version of Purolite C104 and this type of resin is widely used within the brewing and soft drinks industry to produce water for lagers and the production of soft drinks. It has UK approval as a weak acid cation resin for potable water applications.
This weak acid cation resin is sold in large volumes for use in drinking water filters, jug filters, steam ovens and high quality vending machine cartridges and is often used in conjunction with activated carbon. This combination results in a better quality and better tasting water. The carbonic acid formed on waters with high temporary hardness gives the water a sparkling appearance. This resin is not normally used in regenerated systems. In drinking water filter applications it is used to not only to reduce temporary hardness but it will also remove trace levels of metals present and it will continue to work as a heavy metals removal resin even when the resin is exhausted to temporary hardness. Special grades / mixes of this product are available to cater for clients specific requirements.
This is not commonly encountered in water treatment. Weak acid cation resins can be used in some chemical processes or applications where greater osmotic strength is required. Under these circumstances a fully macroporous weak acid cation resin is of benefit such as Purolite C106.
Granular Activated carbon – available in 52 litre bags.
Purolite A400MBOHIND and Purolite A500MBOHIND
Anion indicator resins in OH form, used in HCl vent lines to polish out fumes with colour change indication to show exhaustion. It is normally used in transparent cartridges to witness colour change.
This is a cation indicator resin used by very many power stations prior to an after cation conductivity cell. It is used normally to show in leakage on cooling water / condenser systems. By using this cation indicator resin they remove conditioning amines and hence any conductivity change is due to anions present. This therefore indicates a condenser leak.
Biodiesel polishing resin to enable producers to meet international specifications for commercial sale
Floating inert – large round beads for use in packed beds where large volume of inert is required, giving lower pressure drop than IP4.
Floating inert – small rods, used to provide a barrier to stop resin contacting top distributors, and improve top distribution / collection.
Under drain inert – replaces gravel systems. High density polymer which will help provide additional support to bottom laterals which are not always adequately supported and can fail. This product can help to retain some of the resin in the event of a bottom system failure.
The most interesting product launched in 2010 was Purolite MPR1000. MPR stands for Membrane Protection Resin. This product combines two anion resins, an acrylic organic scavenger resin with a colloid removal resin. It is used prior to RO plants operating on difficult waters where they struggle to give the required throughput and have to be regularly chemically cleaned. Regenerated with salt or salt with caustic this can reduce SDI levels significantly improving water quality and RO performance.
Cyclic – IEx
This is a new process introduced by purolite using our SST (Shallow Shell Technology) and is a special softening resin where the core of the bead is inert and the product is used for softening RO water either in the primary stage or secondary stage to increase RO efficiency to over 90%. This is used on higher TDS RO plants because the softening resin can be regenerated using the RO reject with no added salt required.
Chelating Resin Improvement
Many of our customers know the products S920, S930 and S940 used for metals recovery / removal. 2010 saw Purolite launch a new product Purolite S930 Plus. The performance has been dramatically improved, and now compares favourably with all our competitors products.
SST Cation Resins
Some new SST (Shallow Shell Technology) cation resins have been developed and added to our range. They are now widely sold in the Americas. These are cation resins with an inert core which means with a standard grade resin you can get enhanced performance in some applications.
New range of synthetic adsorbents introduced covering more than 12 products, designed for the increasing demand for these products in IWT and other applications.