This standard specifies the determination method of the maximum regeneration capacity, maximum strong group regeneration capacity and weak group capacity of styrene-based hydroxyl anion exchange resin. This standard is applicable to the determination of the maximum regeneration capacity, maximum strong group regeneration capacity and weak group capacity of styrene-based hydroxyl anion exchange resin. GB/T 5760-2000 Determination method of exchange capacity of hydroxyl anion exchange resin GB/T5760-2000 Standard download decompression password: www.bzxz.net

GB/T 5760—2000
This standard has revised GB/T5760—1986 "Method for Determining Exchange Capacity of Hydroxygen Anion Exchange Resins" according to the provisions of GB/T1.1—1993.
The main technical differences between this standard and GB/T5760-1986 are: 1. The exchange capacity is changed to the maximum regeneration capacity and defined; 2. The strong group capacity is changed to the maximum strong group regeneration capacity and defined. From the date of implementation, this standard will replace GB/T5760--1986. This standard was proposed by the Electric Power Department of the State Economic and Trade Commission. This standard is under the jurisdiction of the Plastic Resin Products Branch of the National Plastic Standardization Technical Committee (TC15/SC4). This standard was drafted by the Thermal Engineering Research Institute of the State Power Corporation. The main drafters of this standard are: Shao Lin, Wang Guangzhu, Cui Huanfang, Wu Wen.
This standard was first issued in 1986.
This standard is interpreted by the Thermal Engineering Research Institute of the State Power Corporation. 260
1 Scope
National Standard of the People's Republic of China
Method for determination of exchange capacity of anion exchange resins in hydroxylic forr!GB/T5760--2000
Replaces GB/T 5760--1986
This standard specifies the method for determination of maximum regeneration capacity, maximum strong group regeneration capacity and weak group capacity of styrene-based hydroxyl anion exchange resins.
This standard is applicable to the determination of maximum regeneration capacity, maximum strong group regeneration capacity and weak group capacity of styrene-based hydroxyl anion exchange resins.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T601-1988 Preparation of standard solutions for titration analysis of chemical reagents (volume analysis) GB/T603-1988 Preparation of preparations and products used in test methods for chemical reagents GB/T5475-1985 Sampling method for ion exchange resins GB/T5476-1996 Pretreatment method for ion exchange resins GB/T5759-2000 Determination of water content of hydroxyl type anion exchange resins 3 Definitions
3.1 Maximum regeneration capacity: The number of all active groups in anion exchange resins that can undergo exchange reactions with excess primary strong acids after regeneration according to the method specified in this standard, expressed in mmol/g (thousands). 3.2 Maximum strong base group regeneration capacity: The number of active groups in anion exchange resins that can undergo exchange reactions with sodium sulfate after regeneration according to the method specified in this standard, expressed in mmol/g (dry). 3.3 Hydroxytype is the general term for the closed strong base of the hydroxide type and the weak base of the free amine type. 4 Principle
When the hydrofluoric anion exchange resin reacts with an excess of a monobasic strong acid (such as hydrochloric acid) solution, the maximum regeneration capacity of the anion exchange resin can be calculated by titrating the amount of unreacted acid. The reaction formula is: N·OH
+ 2HC1 R
N·HCI
When the hydroxyl type anion exchange resin reacts with the neutral salt sodium sulfate, the strong base group (R·OH) undergoes the following reaction: 2RN·OH+NazSO,=(RN),SO++2OH-+2Na*Approved by the State Administration of Quality and Technical Supervision on March 16, 2000, implemented on September 1, 2000
GB/T 5760—2000
The maximum strong base group capacity of the anion exchange resin can be calculated by titrating the hydroxyl (OH-) retained. 5 Reagents
5.1 Pure water: conductivity 3μS/cm (25℃). 5.2 Sodium hydroxide solution: cNaOH) = 2mol/L, measure 100mL of saturated sodium hydroxide solution, inject it into 900mL of pure water, and shake well. 5.3 Sodium sulfate solution: c(Na2SO,) = 0.5mol/L, weigh 71g analytical pure anhydrous sodium sulfate with a pan balance, add 950mL pure water to dissolve.
5.4 Standard hydrochloric acid titration solution: c(HCI) = 0.1mol/L, prepared according to 4.2 of GB/T601-1988. 5.5 Standard sodium hydroxide titration solution: c(NaOH) - 0.1mol/1, prepared according to 4.1 of GB/T601-1988. 5.6 Phenol indicator solution (10g/L): prepared according to 4.5.22 of GB/T603-1988. 5.7 Methyl red-methylene blue mixed indicator solution: dissolve 0.2g methyl red in 100mL anhydrous ethanol, dissolve 0.1g methylene blue in 100mL anhydrous ethanol, and mix the above two solutions in equal volumes. 6 Instruments
6.1 Organic glass exchange column or glass exchange column: inner diameter 19mm, effective column height 225~300mm, as shown in Figure 1. 6.2 Separating funnel: 250ml, fixed on the top of the exchange column with a rubber stopper. 6.3 Organic glass centrifugal filter tube or glass centrifugal filter tube: as shown in Figure 2. 6.4 Electric constant temperature water bath: temperature control accuracy ±1℃. 6.5 Rack balance: sensitivity 1g, maximum weighing 1000g. 6.6 Analytical balance: sensitivity 0.1mg, maximum weighing 200g. 6.7 Electric centrifuge: speed 0~4000r/min (adjustable), 4 50mL centrifuge tubes; model 80-A or LD-5A. 6.8 Stopwatch: graduation value 0.02s.
6.9 Conical flask with stopper: 250ml.
6.10 Weighing bottle: $40mm×20mm, $70mm×35mm. 6.11 Burette: 25ml, graduation value 0.1ml. 6.12 Pipette: 25mL, 100mL.
6.13 Measuring cylinder: 50ml.
6.14 Erlenmeyer flask: 250mL.
7 Sample preparation
7.1 Sampling
M24×1
GB/T5760—2000
1--Orthoglass tube; 2-Rubber gasket: 3-Filter plate, 4-$6 rubber tube; 5--M8X1 Orthoglass bolt Figure 1
Orthoglass exchange column
1-Orthoglass tube; 2Orthoglass filter plate Figure 2Orthoglass centrifugal filter tube
Perform according to GB/T5476.
7.2 Pretreatment
Perform according to GB/T5476.
7.3 Preparation of hydroxyl anion exchange resin sample 7.3.1 Add a small amount of pure water to the organic glass exchange column, and the liquid level is 5cm higher than the filter plate. 7.3.2 Take about 15 mL of pretreated strong alkaline anion exchange resin or about 40 mL of pretreated weak alkaline anion exchange resin and place it in the exchange column. Remove bubbles in the resin layer and drain until the liquid level is 2 cm above the resin layer. 7.3.3 Add 2 mol/L sodium hydroxide solution (solution temperature 15-40°C) or 30 mol/L sodium hydroxide solution (solution temperature 25-40°C) to the separatory funnel, and pass it from top to bottom at a flow rate of 15-30 mL/min (about 60 minutes to flow through). When transforming, avoid biased flow and empty liquid layer. 7.3.4 Pass pure water to wash the resin at the same flow rate until 1 drop of phenolphthalein indicator solution is added to 2-3 mL of effluent and it does not turn red.
7.3.5 Remove external moisture according to the method specified in GB/T5759. Place in a weighing bottle and cover tightly. 7.3.6 Determine the water content of the hydroxide type anion exchange resin according to the method specified in GB/T5759. 8 Operation steps
8.1 Determination of the maximum regeneration capacity of the hydroxide type anion exchange resin8.1.1 Weigh two samples by reduction method. Each sample of the strongly basic anion exchange resin is about 2.5g; each sample of the weakly basic anion exchange resin is about 2.0g; accurate to 0.1mg, place in a dry stoppered conical flask; record as Wi. 8.1.2 Use a pipette to draw 100mL of 0.1mol/L hydrochloric acid standard titration solution (c1), add it to the stoppered conical flask with samples, shake well, cover the bottle stopper tightly, put it in a 40℃ water bath, soak for 2h, take it out, and cool it to room temperature. 8.1.3 Use a pipette to take out 25 mL of soaking solution from the stoppered flask (do not suck out the resin particles) and place it in a flask, add 50 mL of pure water and 2 drops of phenolic acid indicator solution.
8.1.4 Use 0.1mol/L sodium hydroxide standard titration solution (c2) is titrated until the reddish color remains unchanged for 15 seconds, which is the end point. Record the volume of sodium hydroxide standard solution consumed, VimL. 8.2 Determination of the maximum strong group regeneration capacity of hydroxyl anion exchange resin 8.2.1 Weigh two samples by reduction method. Each sample of strong basic anion exchange resin is about 2.5g, and each sample of weak basic anion exchange resin is about 10g, accurate to 0.1mg, and placed in a dry stoppered conical flask, recorded as W2. 8.2.2 Use a pipette to draw 100mL of 0.5mol/L sodium sulfate solution, add it to the stoppered conical flask with samples, shake well, cover the bottle stopper tightly, and soak at room temperature for 20min.
8.2.3 Use a pipette to take out 25mL of the bubbling solution from the stoppered conical flask (do not suck out the resin particles) and place it in the conical flask, add 50mL of pure water and 3 drops of methyl red-methylene blue indicator solution. 8.2.4 Titrate with 0.1 mol/L hydrochloric acid standard titration solution (CI) until the purple-red color remains unchanged for 15 seconds, which is the end point. Record the volume of hydrochloric acid standard solution consumed, V2mL.
9 Result expression
9.1 Maximum regeneration capacity Q of hydroxyl type anion exchange resin is calculated according to formula (1): Q, 100c1 = 4cz: V
W(1 - X)
Wherein: Qi--maximum regeneration capacity of hydroxyl type anion exchange resin, mmol/g; 100--amount of hydrochloric acid standard titration solution, mL; C1--concentration of hydrochloric acid standard titration solution, mol/L; C2-concentration of sodium hydroxide standard titration solution, mol/L; V.--volume of sodium hydroxide standard titration solution consumed in titration soaking solution, mL; W mass of resin sample, g;
. (1)
X…--water content of hydroxyl type anion exchange resin, %. The difference between the two measured values ​​shall not be greater than 0.11mmol/g (dry, hydroxyl type), and the arithmetic mean of the two measured values ​​shall be taken as the measurement result. 9.2 The maximum strong group regeneration capacity Q2 of the hydroxyl type anion exchange resin is calculated according to the formula (2): 4cr C2
Q=w,(1-x)
Wherein: Q.--the maximum strong group regeneration capacity of the hydroxyl type anion exchange resin, mmol/g; C1-concentration of the standard hydrochloric acid titration solution, mol/L; 264
....(2)
GB/T 5760--2000
V is the volume of the standard hydrochloric acid titration solution consumed by the titration bubbling solution, nL; W is the mass of the resin sample, g;
X is the water content of the hydroxyl type anion exchange resin, %. The difference between the two measured values ​​shall not be greater than 0.11 mmol/g (dry, hydroxyl type). The arithmetic mean of the two measured values ​​is taken as the measurement result. 9.3 Weak base group capacity Q of hydrogen-loaded anion exchange resin: calculated according to formula (3): Q3 Q1 Q2
Wherein: Q weak base group capacity of hydrogen-loaded anion exchange resin, mmol/g; Q maximum group regeneration capacity of hydrogen-loaded anion exchange resin, mmol/g; Q maximum strong group regeneration capacity of hydrogen-loaded anion exchange resin, mmol/g. 10 Allowable difference
The allowable difference of the test results is shown in Table 1.
Table 1 Allowable difference of the exchange capacity determination method of hydroxyl anion exchange resin
Maximum regeneration capacity
Maximum strong group regeneration capacity
11 Test report
The test report should include the following items:
8) Indicate the reference to this standard;bzxZ.net
冏一Intra-laboratory allowable difference
mmol/g
b) Complete identification of the tested product: including product name, model, grade, manufacturer name, trademark, etc.; c) Maximum regeneration capacity, mmol/g (dry); d) Maximum strong group regeneration capacity, mmol/g (dry); e) Weak group capacity, mmol/g (dry)
1) Test personnel and test date.
Inter-laboratory allowable difference
mmol/g
（3）
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.