Original standard number GB/T 3635-1983 HG/T 2783-1996 Molecular sieve crushing resistance test method HG/T2783-1996 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG / T 2783 —1996
Test method for crushing resistance of molecular sieves
Published on January 23, 1996
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1997
This standard is equivalent to ASTM D4179—88 "Standard Method for Crush Resistance of Single Particle Molded Catalysts", but the number of particles to be tested is reduced from 100 to 25, and corresponding verification work has been carried out. This standard provides a unified method for determining the crushing resistance of various molecular sieves. The crushing resistance in this standard refers to the conventional compressive strength. Compared with GB10505.1-89 "3A Molecular Sieve Compressive Strength Determination Method", this standard has the following modifications: when testing strip molecular sieve samples, the original axial crushing resistance is changed to radial crushing resistance, and the sample pre-processing process is cancelled; the number of particles to be measured is reduced from 50 to 25; the ordinary dryer method is used to replace the vacuum dryer method to cool the sample. In this way, the entire test process is more in line with actual application conditions, and the operation is simple and fast.
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is technically managed by the Shanghai Research Institute of Chemical Industry of the Ministry of Chemical Industry. The drafting unit of this standard is Shanghai Global Molecular Sieve Co., Ltd. of Shanghai Research Institute of Chemical Industry. The main drafters of this standard are Xue Meijun, He Fangju, and Yang Lili. 1 Scope
Chemical Industry Standard of the People's Republic of China
Test method for crushing resistance of molecular sieves
This standard specifies the test method for crushing resistance of molecular sieve particles. This standard is applicable to the determination of crushing resistance of various molecular sieve particles. 2 Referenced standards
HG / T 2783 --- 1996
The provisions contained in the following standards also constitute the provisions of this standard through reference in this standard: When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1250-89 Method for expressing and judging limit values ​​GB/T 6288-86 Method for determining particle size of granular molecular sieves GB/T 6678—86 General Rules for Sampling of Chemical Products 3 Definitions
This standard adopts the following definitions:
Coefficient of variation
Uniformity of the crushing resistance of the sample itself.
4 Principle
This method uses a particle strength tester to apply radial or point contact pressure to the calcined molecular sieve, measure the force required to crush the particles, take the average value of each measurement as the measured value, and evaluate the crushing resistance and uniformity of the sample by the mean value of the compressive force and the coefficient of variation.
5 Apparatus
5.1 Particle strength tester: Range: 0~250 N; Accuracy: ±1.0%.
5.2 Porcelain: Capacity 20mL.
5.3 Type resistance furnace: Temperature control can reach 550±15℃, 5.4 Test sieve: in accordance with GB/T 6003--855.5 Dryer: inner diameter about 150mm
5.6 Pressure test mold: material is tool steel: the spherical one is -~ platform, the width of thin strip (d3mm) is 3.18mm±0.02mm, the width of thick strip (d3mm) is 6.35mm±0.02mm, the height is about 3mm, approved by the Ministry of Chemical Industry of the People's Republic of China on January 23, 1995 and implemented on January 1, 1997
6 Sample
HG/T 2T83-1996
k-thick strip 6.35mm±0.02mm
thin strip 3.18mm±0.02mm
Figure 1 Schematic diagram of the crushing force test mold of strip molecular sieve
Figure 2 Schematic diagram of the crushing force test mold of strip molecular sieve 6. 1 Sampling: Determine the number of sampling units according to GB/T 6678 6.6. When sampling, use the center of the white barrel of the sampler to take samples 1/4 of the depth of the barrel. The amount of sample taken each time should be no less than 100g. 6.2 Spherical molecular sieves: screen the ball diameter according to GB/T6288. 6.3 Strip sieves: take samples with a length greater than twice the strip diameter. 6.4 Use a divider or quartering method to reduce the sample to about 50 parts for later use. 7 Determination
7.1 Place the sample in a porcelain crucible (without a tight lid), put it into a box-type resistance furnace, and roast it at 550°C for 1h.7.2 Take out the porcelain crucible, cover it with a lid, and place it in a desiccator filled with fresh molecular sieve (molecular sieve desiccant roasted at 550°C for 2h) as a desiccant, and cool it to room temperature
7.3 Place the spherical sample on the test table of the particle strength tester, and measure the crushing resistance of 25 samples one by one.7.4 Place the strip sample on its side (the strip sample and the test template are in a vertical position) on the test mold of the particle strength tester, and measure the crushing resistance of 25 samples one by one.8 Expression of analysis results
8.1 The average crushing resistance of the sample is represented by F, which is calculated according to formula (1): F
Where: F--
—mean value of crushing force, N;
F single sample crushing force, N;
25-number of test specimens.
HG/T2783-1996
8.2 Calculate the standard deviation 3 of 25 measurements (take 3 significant figures), and calculate according to formula (2) 25
Where: F——mean value of crushing force, N:
F single sample crushing force, N;
-number of test specimens.
8.3 The coefficient of variation of the crushing force of the sample is expressed as C, and C is calculated according to formula 3)
Where: S is the standard deviation of the crushing force measured for 25 times; F
is the mean value of the crushing force, N.
People's Republic of China
Chemical Industry Standard
Test method for crushing force of molecular sieves
HG/T2783—1996
Editor: Chemical Industry Standard Editing and Publishing Group
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100011 Www.bzxZ.net
Printing: Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format: 880×1230 1 / 16Printing Sheet: 6 Words 000First edition in October 1996
First printing in October 1996
Print run 1-——500
Cost 7.00 yuan
9661-5877 1/0
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