GB/T 5759-2000 Determination of water content of hydroxide anion exchange resin

This standard specifies the determination method of water content of strong base anion exchange resins of the hydroxide type and weak base anion exchange resins of the free amine type. This standard is applicable to the determination of water content of strong base anion exchange resins of the hydroxide type and weak base anion exchange resins of the free amine type. GB/T 5759-2000 Determination method of water content of strong base anion exchange resins of the hydroxide type GB/T5759-2000 Standard download decompression password: www.bzxz.net

GB/T5759-2000
This standard is revised according to GB/T1.1-1993.
The main technical difference between this standard and GB/T5759-1986 is that the operation steps of removing external moisture are specified in detail. This standard will replace GB/T5759-1986 from the date of implementation. This standard is 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 is drafted by the Thermal Engineering Research Institute of the State Power Corporation. The main drafters of this standard are: Bu 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. 255
1 Scope
National Standard of the People's Republic of China
Determination for water retention capacity of anion exchange resins in hydroxylic form GB/T5759-2000
Replaces GB/T5759-1986
This standard specifies the determination method for water retention capacity of strong basic anion exchange resins in hydroxylic form and weak basic anion exchange resins in free amine form. This standard is applicable to the determination of water content of strong basic anion exchange resins in hydroxylic form and weak basic anion exchange resins in free amine form. 2 References
The provisions contained in the following standards are constituted as provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T5475-1985 Sampling method of ion exchange resin GB/T5476-1996 Pretreatment method of ion exchange resin GB/T5760-2000 Determination method of exchange capacity of hydroxyl anion exchange resin 3 Definition
The water content of hydroxyl anion exchange resin refers to the equilibrium water content contained in the ion exchange resin particles after the strong base group of the anion exchange resin is converted into hydroxyl type and the weak base group is converted into free amine type by sodium hydroxide solution. 4 Principle
After removing the external water from the hydroxyl anion exchange resin sample that has absorbed the equilibrium water content by centrifugation, a certain amount of sample is weighed, and the sample is completely converted with hydrochloric acid solution, and then the excess acid is washed off with anhydrous ethanol, and dried at 105°C, and the dry basis mass is measured. The increment of conversion is removed to obtain the dry basis mass of the hydroxyl sample, that is, the mass difference between the wet and dry samples is obtained, and the water content is calculated accordingly. 5 Reagents
5.1 Anhydrous ethanol: analytical grade.
5.2 Pure water: conductivity less than 3μS/cm (25°C). 5.3 Hydrochloric acid solution: c(HCi)=1mol/L, measure 90mL chemically pure hydrochloric acid and inject it into 1000mL pure water. 5.4 Silver nitrate solution (50g/L): weigh 5 analytical pure silver nitrate and dissolve it in 95mL pure water. 5.5 High-temperature grease: dropping point not less than 200°C. 6 Instruments
6.1 Water content tester: standard ground mouth BM19/26, No. 1 microporous sand core, as shown in Figure 1. 6.2 Separating funnel: standard ground mouth BM19/26, 250mL, as shown in Figure 2. 6.3 Organic glass or glass centrifugal filter tube: as shown in Figure 3. Approved by the State Administration of Quality and Technical Supervision on March 16, 2000 256
Implementation on September 1, 2000
020~21
Moisture content meter
GB/T5759—2000
No. 1 Secret Corebzxz.net
Xin Ya*3
1 Organic glass tube, 2—Organic glass filter plate Figure 3 Organic glass centrifugal filter tube
6.4 Oven: maximum temperature 200℃, temperature control accuracy ±2℃92/61
#86±1
Figure 2 Separating funnel
6.5 Pan balance: sensitivity 1g, maximum weighing 1000g. 6.6 Electric centrifuge: speed 0~4000r/min (adjustable), 4 50mL centrifuge tubes: model 80-A or LD-5A6.7 Stopwatch: graduation value 0.023.
Core hole 3
6.8 Dryer: $250mm, with silica gel desiccant inside. GB/T5759—2000
6.9 Weighing bottle: $40mmX20mm, §70mmX35mm. 6.10 Analytical balance: sensitivity 0.1mg, maximum weighing 200g. 7 Sample preparation
7.1 Sampling
Perform according to GB/T5475.
7.2 Pretreatment
Perform according to GB/T5476.
7.3 Preparation of hydroxyl anion exchange resin samples. Perform according to GB/T5760.
8 Operation steps
8.1 Place 5~15mL of the hydroxyl type anion exchange resin sample treated according to GB/T5760 into a centrifugal filter tube, cover the sample layer with a layer of filter paper, and drop a drop of pure water on the filter paper. Place a sample or water in another symmetrical tube, and then weigh it on both sides of a rack balance. Use a small amount of pure water with a conductivity (25℃) less than 3μS/cm to adjust the mass of the two tubes to the same. 8.2 Place the centrifugal filter tube in an electric centrifugal sedimentation machine, centrifuge at 2000r/m±200r/min (80-A model) or 2500/min±200/min (LD-5A model) for 5 minutes, and use a stopwatch to time. 8.3 Take out the centrifugal filter tube, discard the upper filter paper, pour the sample into the weighing bottle, and cover it tightly. When taking out the centrifugal filter tube, prevent the separated free water from re-entering the resin layer. 8.4 Clean the water content measuring instrument, apply high temperature grease on the stopcock, open the stopcock, remove the plug, put them in the oven together, and bake them at 105℃±2℃ until constant weight. Cover the stopcock, close the stopcock, place it in a desiccator, cool it to room temperature, weigh it on an analytical balance, and weigh it to the nearest 0.1mg: record it as mi.
8.5 Add about 1 mol of the hydroxyl anion exchange resin sample from which the external water has been removed into the water content measuring instrument by the incremental method, weigh it on an analytical balance, and weigh it to the nearest 0.1mg: record it as m2. 8.6 Weigh out the sample at the same time, and determine the maximum regeneration capacity of the wet hydroxyl anion exchange resin sample and the maximum regeneration capacity of the strong group according to GB/T5760.
8.7 Add a small amount of pure water to the water content tester that has been weighed with the resin sample to remove the bubbles in the resin layer, add 250mL of 1mol/L hydrochloric acid solution to the separatory funnel, and let it flow through the resin layer at a flow rate of 5~8mL/min. 8.8 Wash the resin with anhydrous ethanol through the separatory funnel at a flow rate of 3~5mL/min. When the effluent is checked with silver nitrate solution (50g/L) to be free of chloride ions, the washing is completed and the remaining ethanol is extracted. 8.9 Open the stopper of the water content tester, open the lower stopcock, put it into the oven together with the stopper, and bake it at 105℃±2℃ for 3h. 8.10 Cover the oven with a stopper, close the lower stopcock, take out and place in a desiccator, cool to room temperature, weigh on an analytical balance, accurate to 0.1 mg; record as m3a
9Result expression
9.1 The water content X (%) of the hydroxyl type anion exchange resin is calculated according to formula (1): X=(1-[2-(36.5-
Imz-mi
Wherein: X is the water content of the hydroxyl type anion exchange resin, %, m. is the mass of the empty water content measuring instrument, g,
m2\-—the mass of the water content measuring instrument and the sample before drying, g; m?—the mass of the water content measuring instrument and the sample after drying?g:258
× 18)×E ×10
**r+ro+ee(1)
GB/T5759--2000
E—Maximum regeneration capacity of hydroxyl anion exchange resin on wet basis, mmol/g; E Maximum regeneration capacity of strong group on wet basis of hydroxyl anion exchange resin, mmol/g. 10 Allowable difference
Same—allowable difference within the laboratory is 1.44%; allowable difference between different laboratories is 3.17%. 11 Test report
The test report should include the following:
a) Indicate the number 1 using this standard:
b) Complete identification of the tested product: including product name, model, grade, manufacturer name, trademark, etc.; c) Water content of hydroxyl anion exchange resin; d) Test personnel and test date.
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.