Inorganic Salts

Strong Acid Cation Exchange Resin

Type: Gel strong acid cation exchange resin
Functional group: Sulfonic acid
Ionic form: Na+
Matrix: Styrene and divinylbenzene, sulphonated

Strong acid cation exchange resin is a gel-type ion exchange resin with the sulfonic acid group as its functional group, prepared by sulphonation of styrene and divinylbenzene with sulfuric acid. It exchanges its own active positive ions for the positively charged ions in water, removing them by substitution. The resin is supplied in the Na+ ionic form as spherical beads with total exchange capacity of 1.9 eq/L min and a temperature limit of 100 deg C.

Why buyers specify this grade

Total exchange capacity 1.9 eq/L min, which sets the throughput a column can deliver between regenerations
Uniformity coefficient 1.6 max, giving even flow and predictable pressure drop through the bed
Particle size 0.315-1.25 mm with 95% min in range, so fines do not blind the bed
Reversible swelling Na+ to H+ of 10% max, so the column freeboard can be sized correctly
Temperature limit 100 deg C, tolerating hot service and hot-water sanitation

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Specification

Appearance	Spherical beads
Moisture content	45 - 50%
Total exchange capacity	1.9 eq/L min
Particle size range	0.315 - 1.25 mm, 95% min
Uniformity coefficient	1.6 max
Reversible swelling Na+ to H+	10% max
Shipping weight	0.77 - 0.85 g/ml
Temperature limit	100 deg C

Technical data

Type: Gel strong acid cation exchange resin
Functional group: Sulfonic acid
Ionic form: Na+
Matrix: Styrene and divinylbenzene, sulphonated
Appearance: Spherical beads

Quality control

Released against exchange capacity, particle size distribution, uniformity coefficient and swelling
TDS and MSDS issued with the order, sample COA on request

Where it is used

Removal of positively charged ions from water by substitution
Water softening and demineralisation service
Process water treatment ahead of sensitive equipment

Who buys it

Water treatment plant operators
Boiler and process water engineers
Demineralisation system integrators

Problems it solves

Pressure drop and channelling from a bed with a wide particle distribution
Column overflow at regeneration because swelling was not allowed for in the freeboard
Capacity falling short of the service run planned between regenerations
Resin degradation in hot service, addressed by the 100 deg C limit

Packing and options

Ionic form supplied as Na+; confirm any other requirement at enquiry
Packing format confirmed at quotation

How it compares

A macroporous resin tolerates fouling and osmotic shock better; this gel type gives higher exchange capacity per litre of bed for the same vessel. Choose the gel resin where the feed water is reasonably clean and capacity per litre is what limits the service run.

Handling and storage

Size the column freeboard for up to 10% reversible swelling on the Na+ to H+ conversion
Do not exceed the 100 deg C temperature limit in service or sanitation
Use the shipping weight of 0.77-0.85 g/ml when calculating the charge for a vessel

FAQ

Strong Acid Cation Exchange Resin questions buyers ask

What is the total exchange capacity

1.9 eq/L min.

Which ionic form is it supplied in

The Na+ form, as gel strong acid cation exchange resin with sulfonic acid functional groups.

What is the particle size

0.315 to 1.25 mm with 95% min in range and a uniformity coefficient of 1.6 max.

How much does it swell on regeneration

Reversible swelling from Na+ to H+ is 10% max, which must be allowed for in the column freeboard.

What temperature can it handle

The temperature limit is 100 deg C.

How does it remove ions from water

It exchanges its own positively charged active ions with the positively charged ions in the water by a substitution reaction, removing them from the stream.

Download TDS, MSDS and sample COA