GB/T 36769-2018Determination of percent regeneration of cation exchange resins (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the method for determining the regeneration conversion rate of hydrogen-type strongly acidic cation exchange resins.

This standard applies to the determination of the regeneration rate of hydrogen-type strong acid cation exchange resin.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

Preparation of GB/T 601 chemical reagent standard titration solution

Preparation of preparations and products used in GB/T 603 chemical reagent test method

GB/T 5475 ion exchange resin sampling method

GB/T 5476 ion exchange resin pretreatment method

GB/T 5757 ion exchange resin water content determination method

GB/T 6682 Analytical laboratory water specifications and test methods

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle

When the regenerated form (hydrogen type) strongly acidic cation exchange resin reacts with an excess of a salt (such as sodium chloride) solution, the exchanged H and When a monobasic strong base (such as sodium hydroxide) solution is reacted, the hydrogen exchange capacity of the cation exchange resin can be calculated according to the titration amount, and the reverse The formula should be.

RH + NaCl -> RNa + HCl

HCl + NaOH -> NaCl + H2O

In the formula:

RH --- indicates a cation exchange resin (hydrogen type);

RNa --- represents a cation exchange resin (sodium type).

According to this, the hydrogen exchange capacity of the cation exchange resin which was originally and completely converted to the regenerated form can be calculated.