HG/T 2691-1995 Determination of dynamic carbon dioxide adsorption by zeolite molecular sieves HG/T2691-1995 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T 2691 —95
Determination of dynamic carbon dioxide adsorption on zeolite molecular sieves
. Issued on April 11, 1995
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1996
Chemical Industry Standard of the People's Republic of China
Determination of dynamic carbon dioxide adsorption on zeolite molecular sieves
Subject content and scope of application
HIG/T 2691 —95
This standard specifies the determination method of dynamic carbon dioxide adsorption when water and carbon dioxide in the air are co-adsorbed on zeolite molecular sieves. This standard is applicable to 13× molecular sieves in strip or spherical form. It can also be used for other zeolite molecular sieves. 2 Reference standards
GB6003 Test sieve
GB/T8770 Molecular sieve dynamic water adsorption determination method GB/T8984 Determination of carbon monoxide, carbon dioxide and methane in gas Gas cotton chromatography
3 Method summary
Under the specified pressure, flow rate and overflow conditions, air containing specified saturated water vapor is continuously passed through the adsorption tube filled with 0.85~1.18mm activated zeolite molecular sieve until carbon dioxide adsorption penetration occurs. Obtain the conversion dynamic adsorption capacity of the molecular sieve for carbon dioxide.
Instruments and materials
General laboratory instruments and:
4.1 Air compressor, rated pressure 0.7MPa;4.2 Oxygen meter, 0～25MPa;
4.3 Humidifier d130mm×3mm×210mm stainless steel round tube, pressure resistance 0.75MPa; see Figure t: Approved by the Ministry of Chemical Industry of the People's Republic of China on 1995-04-11 and implemented on 1996-01-01
Escape port
Hushui port
Intake arm
Jet port
4.4 Water circulation pump, pressure resistance 0.75MPa
HG/T 2691 95
Water receiving tank ring
Water spray white 0.5
Graph display
Liquid level indicator
Water receiving ring pump
4. Humidifier d 50 mm×2 mm×150 mm yellow steel or stainless steel, surrounded by d6 mm×1 mm copper tube or stainless steel tube, pressure resistance 0.75MPa; see Figure 2:
Water inlet
09050599
HG/T 2691--95
Steam outlet pipe
Thermocouple sleeve
Escape pipe 6×『
Precooling coil id6×1
Figure 2 Humidifier
4.6 Adsorber d32mm×3mm×75mm yellow steel or stainless steel, wrapped with d6mm×1mm copper tube or stainless steel tube, pressure resistance 0.7sMPa; see Figure 3:
Sealing pad
Pressure screw width
Adsorber
Steam outlet pipe a6×
Metal screen
(0. 15mm)
HG / T 2691 --- 95
Adsorber
Thermocouple sleeve
Inlet pipe d6 ×(
Precooling coil 46
4.7 Rotor flow meter, 0.1~1.0m/h
: HG/T 2691-95
4.8 Mixed flow meter, rated flow 0.5m/h; 4.9 Carbon dioxide automatic analyzer, minimum division 2×10-5 (V/V); 4,10 Recorder, 0~10mV;
Needle valve;
4. 12 Pressure gauge, 0~1MPa;
4.13 Thermos bottle, 20 lbs and 5 lbs each; 4.14
Overflow indicator, 0~20:
4.15 Balance, accuracy 0.001
4.16 Gas chromatograph with hydrogen flame ionization detector; 4.17 Carbon dioxide standard gas:
4.18 Box-type electric furnace, 0~800;
Vacuum pump.
3 Determination steps
5. 1 Determination process
The process is shown in Figure 4:
Figure 4 Flow diagram
1-Air compressor: 2-Oxygen meter: 3-Range extender: 4-Water circulation pump: 5-Hygrostat: 6-Adsorber: 7-Rotameter 8-Wet flowmeter: 9-CO, automatic analyzer: 10-Recorder; 1[One needle reading; 12-Pressure gauge: 13-Insulation board, the air compressed to 0.7MPa is humidified by the humidifier and enters the humidifier placed in an ice water bath to obtain an average pressure of 0.5MPa, 1~2C saturated water vapor air, and passes through the adsorber at a specified flow rate. The gas at the outlet of the adsorber is decompressed to normal pressure, as shown in the flow chart, using two tees and one A spiral clamp divides the air into two paths, one path goes into the wet flow meter, and the other path passes through the carbon dioxide analyzer and is merged into the wet flow meter. The sum of the two gas volumes is the actual flow rate through the adsorber. When the carbon dioxide content in the air at the adsorber outlet reaches 4×10-6 (V/V), the measurement is completed. The carbon dioxide concentration in the raw gas is determined according to the GB/T8984 method. 5.2 Sample processing
Crush the sample and sieve: Take about 40mL of the sample with a particle size of 0:85~.18mm and put it into a box-type resistance furnace. Burn it at 550±10℃ for 2h. After taking it out, immediately put it into a vacuum desiccator and evacuate it to -0.1MPa. Under this vacuum state, cool it to room temperature for use.
HG / T 2691 —95
5.3 Weigh about 40 mL of molecular sieve sample (accurate to 0.001 g) to obtain the mass m. Load all the weighed molecular sieve into the adsorber and connect it to the system. Check the air tightness of the system until there is no leakage. 5.4 Place the humidistat and adsorber in an ice-water bath to stabilize their temperature at 1.5±0.5℃. 5.5 Note the room temperature T and atmospheric pressure Pj.
5.6 Note the starting reading V of the wet flow meter
5.7 Turn on the power of the air compressor. When the specific pressure rises to above 0.6 MPa, open the air outlet valve to allow air to enter the measurement system. 5.8 Quickly turn on the power of the water circulation pump, carbon dioxide analyzer, and recorder in turn. 5.9 Use a needle-shaped aperture 11 to control the pressure before and after the adsorber to be about 0.5 MPa and the flow rate to be 0.24~0.28 m3/h to carry out the adsorption test, and at the same time adjust the gas flow rate entering the carbon dioxide automatic analyzer to the specified value. 5.10 Observe the carbon dioxide concentration indicated on the carbon dioxide automatic analyzer at any time. When the analyzer indicates 4×10-6 V/V), read the cumulative volume reading V26 of the wet flowmeter. Calculation and results
The conversion adsorption capacity of carbon dioxide is represented by X and is calculated according to the following formula: c×10
Where: x-
×44×
-conversion adsorption capacity, the amount of carbon dioxide adsorbed per gram of molecular sieve. mg/g Carbon dioxide concentration in raw gas, 10-6 (V/V); T——standard state temperature, 273.2K;
TrRoom temperature during test, K;
Po——standard state atmospheric pressure, 101.3kPa;P,
-atmospheric pressure during test, kPa:
Mass of molecular sieve sample, name;
-Volume of processed air at conversion, L,
The arithmetic mean of two parallel determinations is the determination result, 7 allowable deviation
The relative deviation of two parallel determinations should be less than 8%, additional notes:
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 under the jurisdiction of Shanghai Research Institute of Chemical Industry, Ministry of Chemical Industry. This standard was drafted by Shanghai Research Institute of Chemical Industry, Ministry of Chemical Industry. The main drafters of this standard are Fu Jiwen and Gui Guangyan. People's Republic of China
Chemical Industry Standards
Determination of Dynamic Carbon Dioxide Adsorption on Zeolite Molecular Sieve
HG/T 2691-95
Editorial and Publishing Group of Chemical Industry Standards (Institute of Standardization, Ministry of Chemical Industry)
Political Code: 100011
Printing Institute of Standardization, Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Copyright 880×12301/16 Printing Sheet Number of Words 12000 First Edition October 1995
First Edition October 1995! bzxZ.net
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