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Device and method for preparing calibrating gas

A standard gas and gas sampling technology, applied in mixing methods, chemical instruments and methods, gas and gas/steam mixing, etc., can solve the problems of single concentration of gas samples, accuracy affected by vacuum degree, harsh conditions, etc.

Inactive Publication Date: 2007-09-19
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing gas, first use the gas outlet to evacuate the cylinder, use the vacuum valve to display the vacuum degree in the cylinder, close the gas outlet, and then add gas through the inlet port, the gas preparation process is controlled by the vacuum valve to display the vacuum degree in the cylinder The amount of solute gas and solvent gas added, the accuracy is affected by the vacuum degree, the conditions are harsh, and the concentration of the produced gas sample is single, which cannot meet the laboratory's determination requirements for gas samples with different concentrations
It can be seen that the current gas distribution method is relatively cumbersome, and the requirements on the device are too strict, which is not suitable for gas sample analysis in ordinary laboratories.

Method used

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  • Device and method for preparing calibrating gas
  • Device and method for preparing calibrating gas
  • Device and method for preparing calibrating gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: The gas storage bottle is filled with solvent gas by the method of water drainage and gas collection

[0058] As shown in Figure 1, the gas cylinder (1) is filled with water, the bottle mouth is tightly closed with a rubber stopper with conduit A (3) and conduit B (7), and valve A (5) and valve B (6) are closed , and then fix it upside down on the iron stand, connect the inlet end of conduit A (3) to the nitrogen cylinder, slowly open the pressure reducing valve (2) on the cylinder, and simultaneously open valve A (5) and valve B (6), so that Fill the entire pipeline with nitrogen gas and enter the gas storage bottle (1), drain the liquid slowly, after the liquid flows out, blow off the pipeline slowly with nitrogen gas, and gradually reduce the pressure to the catheter B (7) inserted in the beaker When the last bubble is discharged, quickly close valve A (5) and valve B (6), seal the bottle mouth, and set aside.

Embodiment 2

[0060] As shown in Figure 2, in the standard gas preparation device, the quantitative bottle (8) is connected with the gas storage cylinder (1) through a conduit B (7) provided with a valve B (6), and the gas sampling bag (10) is connected with the gas storage cylinder (1) connected by the conduit A (3) that is provided with valve A (5); the upper scale tube (11) and the lower scale tube (13) in the quantitative bottle (8) are connected as a whole by the base tube (12), and the lower scale The pipe (13) is provided with a valve C (9); a gas drying pipe (4) is provided between the gas sampling bag (10) and the gas cylinder (1).

Embodiment 3

[0062] The nitrogen collected in the gas cylinder (1) in Example 1 was used. As shown in Figure 2, inject saturated salt water into the gas quantitative bottle (8), adjust valve C (9) to fill the pipeline B (7) with saturated salt water, and add saturated salt dropwise to the gas quantitative bottle (8) Water to 498.0ml; open valve C (9) and valve B (6) of the gas quantitative bottle, saturated saline enters the gas storage bottle (1), and discharges the gas in the gas storage bottle (1) into the gas sampling in the bag (10) (the gas sampling bag needs to be evacuated first and rinsed with nitrogen for 3 times). When the saturated saline liquid level reaches the zero mark line of the lower scale tube (13) of the quantitative bottle (8), close the valve C (9). The exact volume between the scale marks is 498.0ml; while charging nitrogen into the gas sampling bag (10), accurately absorb 2.00ml of methane gas with an airtight syringe, then the final concentration of methane gas i...

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Abstract

The present invention discloses a method for preparing a standard gas and used apparatus. The technical plan is as follows: a volumetric flask is connected to a gasholder through a pipe equipped with a valve, a gas sampling bag is connected to the gasholder through a pipe equipped with a valve. During preparing a standard gas, at ambient pressure, liquid is added into the volumetric flask capable of measuring and getting liquid accurately, and a certain amount of liquid is accurately added into the gasholder filled with a solvent gas and connected to the gas sampling bag, wherein escaping the solvent gas during the liquid adding-into course in collected to the bag sampling bag, with the volume of the solvent gas collected being equal to that of liquid flowing into the gasholder. Said gas distribution apparatus in accordance with the present invention is operated conveniently, is easy to master, is assembled simply and cheaply, has high gas distribution precision and accuracy (RSD<=0.64%) superior to that of sample analysis by a gas chromatography. Therefore, it is convenient for extending said apparatus in common labs, which is capable of satisfying quality inspection analysis requirements of labs who perform gas and atmosphere analysis and have gas chromatography instruments.

Description

technical field [0001] The invention relates to a device and a method for preparing a standard gas, in particular to a device and a method for preparing a standard gas suitable for the requirements of gas analysis or atmospheric quality inspection analysis in ordinary laboratories, and belongs to the technical field of instrument analysis and measurement. Background technique [0002] The rapid multi-dimensional diffusion and compressibility of gas make it difficult to accurately measure a large amount of gas substances, making it difficult to prepare a certain concentration of gas samples and a certain concentration of standard gases in ordinary laboratories. Unlike solid and liquid substances, which can be easily measured with a general measuring instrument to measure a certain weight or volume, gases need to be measured with a special device. Therefore, the standard gases used in the determination of gases in ordinary laboratories must be purchased from professional insti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/38B01F3/02B01F15/04B01F23/10
Inventor 郭治安张永科赵景婵
Owner NORTHWEST UNIV(CN)
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