JPS6034689B2 - Column equipment for gas concentration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a column for concentrating diluted gases.

Generally, when a dissolved gas is degassed from a liquid by bubbling an inert gas and the dissolved gas is measured using an analytical instrument such as a gas chromatograph, the degassed state of the dissolved gas differs depending on the component. Since the gas is not degassed all at once but continuously over a long period of time, the amount of deaeration per unit time is small.
This degassed gas is directly guided to an analytical instrument, and if the degassed gas is a single component, it can be measured, but if the degassed gas contains multiple components, all the components are measured simultaneously and continuously, so it cannot be measured in a gas chromatograph. There were cases where separation was not possible and measurement was difficult. The present invention
This was done to eliminate the above-mentioned inconvenience.

An embodiment of the present invention will be described in detail below.

That is, FIG. 1 shows an embodiment of the present invention, in which a shows the state during gas adsorption and b shows the state during desorption. In the figure, reference numeral 1 denotes a gas concentration column (hereinafter simply referred to as column), which is filled with molecular sieve 5A2 as an adsorbent.

3 is a heater for heating the column, and 4 and 5 are three-way valves.

In the apparatus configured as described above, first, the three-way valves 4 and 5 are set as shown in FIG. It is introduced into column 1 via valve 4. The gas introduced into the column 1 is adsorbed by the adsorbent 2, and the carrier gas is discharged from B via the three-way valve 5. When the gas degassed from the liquid is composed of gases of various components, the gases of the components that are easily adsorbed by the adsorbent 2 are in the column 1.
However, gases with components that are difficult to be adsorbed by the adsorbent gradually reach the outlet side of the column 1 and become adsorbed. Now, when the gas adsorption is completed, the three-way valves 4 and 5 are switched as shown in FIG. As a result, gas is desorbed from the adsorbent and sent out from D together with the carrier gas. At this time, if the column heating heater 3 is energized to heat the column, the gas can be desorbed from the adsorbent more quickly. Gas desorption occurs quickly, so even dilute gases are concentrated and D
For example, it can be sufficiently analyzed by an analyzer such as a gas chromatograph.

By flowing the carrier gas during desorption in the opposite direction to that during adsorption, the various component gases can be smoothly desorbed.

In order to see the effects of using the concentration column of the present invention as described above, a model experiment was conducted in which ethane, ethylene, and fluorine were added to oil. Ro/gun, fu. Comparison of gas chromatographs in which lopylene, acetylene, and n-butane were dissolved, degassed using helium as a carrier gas, and recorded directly on a gas chromatogram, and one in which they were once collected and concentrated in a gas concentration column. In this case, if the concentrating column of the present invention is not used, the continuously degassed gases will not be separated satisfactorily and the result will be as shown in Figure 2. It was found that when the sample was injected with a syringe, the same chromatogram as shown in Figure 3 could be obtained. As described above, according to the column device of the present invention, low concentration gases can be detected at the source, which was a problem when measuring with conventional gas chromatographs, etc., and gases that continuously enter the measuring instrument and are difficult to measure. Since it is possible to condense the gas and introduce it all at once to, for example, a measuring device, it becomes possible to measure gases at extremely low concentrations that could not be measured up to now.

The column device of the present invention can be applied in the following ways.

{1) If the column device of the present invention is used in place of the absorption liquid by cross-concentrating it with an absorption liquid using a handy air sampler, it will be convenient for transportation.

■ When measuring pyrolysis gases, if the column device of the present invention is installed in the system connecting the pyrolysis equipment and the measuring device, it will be possible to measure extremely small amounts of pyrolysis gases or use cold traps instead of the conventional methods. The detection limit is also higher than that of a cold trap, and the efficiency of collecting generated gas is also higher than that of a cold trap.

[Brief explanation of the drawing]

FIGS. 1a and 1b are schematic diagrams showing one embodiment of the present invention, in which a shows a state during collection and concentration, and b shows a state during desorption. FIGS. 2 and 3 are explanatory graphs. In the figure, 1
2 is a column for gas concentration, 2 is an adsorbent, 3 is a heater for heating the column, and 4 and 5 are three-way valves. Note that the same reference numerals in the figures indicate the same parts. Figure 1 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 A gas concentrating column provided extending in the flow direction of the gas to be concentrated, a molecular sieve packed inside the gas concentrating column, and a molecular sieve provided at the inlet and outlet of the gas concentrating column, respectively. At the time of adsorption, a dilute gas to be concentrated is introduced into the gas concentrating column, adsorbed by the molecular sieve, and then discharged outside the gas concentrating column, and at the time of desorption, the carry gas is introduced into the gas concentrating column. A pair of three-way valves that introduce the dilute gas to be concentrated in the opposite direction to desorb the gas from the molecular sieve and then discharge it to the outside of the gas concentrating column, and a pair of three-way valves that heat the gas concentrating column during the desorption. A column device for concentrating a gas, comprising a heating means for promoting the desorption.