JPS58186048A - Apparatus of gas chromatograph - Google Patents

Abstract

PURPOSE:To obtain a series of continuous chromatograms of various gases in a short time, by providing the first column and the second column having a pipe for adjusting gas detecting time and making the first column and the second column changeable. CONSTITUTION:A four-way switching valve 11a is provided as shown by a solid line and a gaseous mixture of six components A-F is passed through the first column 5c by switching a six-way switching valve 2 to a flow passage shown by a dotted line to detect and measure said gas by a gas sensor 7c, thereby obtaining chromatograms A-C. After the measurement is finished, the valve 11a is switched as shown by the dotted line and a separation is performed by the second column 5d and then, the chromatograms D-F are obtained in succession to that of A-C by detecting and measuring the gas components D-F having delayed outflow time by a pipe 10 for adjusting gas detecting time by the gas sensor 7c. Hereby, a series of continuous chromatograms of various gases is obtained in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas chromatograph apparatus, and particularly to a gas chromatograph apparatus having a gas calibration tube, a column, a gas sensor, and the like.

Conventionally, when it is necessary to detect all of the various mixed gas components in one detection operation, for example, H! , C.O.

If one attempts to quantitatively analyze a mixed gas such as CH4, Cm Hl, C2H4, C*Ha, etc. using a single column, an extremely long column is required, and the time required to detect the C1 gas component also becomes long.

For this reason, in order to detect the gas components of A-F in a short period of time, it is often necessary to use a gas chromatograph apparatus such as that shown in FIG. 1, for example. In the figure, 1 is a gas measuring tube, 2 is a six-way switching valve, 3 is a valve, 4 is a carrier gas generator, 5a, 5bi column, 6a1
6b is a gas separation filler, 7a and 7b are gas sensors,
8a.

8b is an amplifier section 9a of the gas sensors 7a and 7b.

9b is the recording side. In other words, the gas sensor 7a, which is suitable for separating each gas,? It was necessary to set up bi and measure it. However, in this case, the chromatogram of each gas, in which the outputs of the gas sensors 7a and 7b are plotted on the vertical axis and time is plotted on the horizontal axis, which is the measurement result, is shown by the dotted line in the diagram shown in FIG. The display is in column 5a, and the dotted line in the figure is column 5b.
As shown in FIG. 2, the data are obtained for each column 5a and 5b, so it is not a continuous series. For this reason, in order to determine the 11 degrees of various gases using these chromatograms, connecting to a data processing device would require double man-hours and complicate operations. Also, as in this example, the waste sensor 7
This requires two interfaces to a, 7b and the data processing device, which is uneconomical.

The present invention has been devised in view of the above points, and its object is to provide a gas chromatograph apparatus that can obtain a series of continuous talomadograms of various gases in a short period of time.

That is, in the present invention, the columns are connected in parallel to the first column whose one end is fully connected to the switching valve, and the tenth column, and to the other end of the tenth column and the gas sensor via the column switching valve. and a second column having a pipe for adjusting gas detection time, and when the first column and the gas sensor are completely communicated with each other by a column switching valve,
It is characterized in that the outlet of the second column is open to the entire outlet, and when the second column and the gas sensor are fully connected, the outlet of the tenth column is switched and connected so as to be open to the entire outlet of the tenth column. .

The present invention will be fully explained below based on the illustrated embodiments.

FIG. 3 shows an embodiment of the present invention. Note that the same parts as in the past have all been given the same reference numerals, so the explanation will be omitted. In this embodiment, the column 5 is connected to a first column 5C whose one end is connected to a six-way switching valve 2, which is a switching valve, and a first column 5C in parallel with the first column 5c and the other end of the first column 5c. and a 20th column 5d connected to the gas sensor 7C via a column switching valve 11, for example, a four-way switching valve 11ai, and having a gas detection time adjustment pipe 10. When the gas sensor 7C is fully connected, the outlet of the second column 5d is opened to the entire atmosphere, and the 20th column 5d and the gas sensor 7C are connected to each other.
0, the outlet of the 10th column 5c was switched and connected to open to the atmosphere.

By doing this, while gas components are separated in the first column 5c and detected by the gas sensor 7c, gas components that cannot be separated in the second column 5d are kept in the atmosphere so as not to be exposed to the gas sensor 7c. into the second column 5d.
The gas components separated in the first column 5C are connected to the gas detection time adjustment pipe 1 in the housing where the detection and measurement of the separated gas ends.
0, the gas separated in the second column 5d can be detected and measured in a short time after the detection and measurement of the gas separated in the tenth column 5C is completed. A series of consecutive chromatograms for each gas can be obtained. Note that the second column 5d
During detection and measurement by the gas sensor 7C, all gas components separated by the first column 5c? The passed gas is released into the atmosphere by the four-way switching valve 11a.

That is, the four-way switching valve 11a? Ifil is set as shown in the center of the figure, the six-way switching valve 2 is switched to the flow path indicated by the dotted line in the figure, and the mixed gas of six components A, B, C, D, E, and F is transferred to the first column 5Ck. The gas is detected and measured by the gas sensor 7C, and a chromatogram of A, B, and C as shown by the solid line in FIG. 4 is obtained.

After measuring the gas components of A, B, and C, open the four-way switching valve 11.
Point a in the figure fi! Switch as shown to separate the gas components in the second column 5d and delay the outflow time in the gas detection time adjustment column (Ive 10).

E, F't - If detected and measured by gas sensor 7C, the fourth
As shown by the dotted line in the figure, the chromatograms E and F can be obtained consecutively with the chromatograms A, B, and C.

In the same figure, 6c and 6d are gas separation fillers, and 8C
is the amplifier section of gas sensor 7C, 9C is the recorder, 12a
, 12b, 12cll carrier gas flow rate yaIi device.

As described above, according to this embodiment, many gas components can be detected with one gas sensor 7c, and unnecessary peaks can be prevented from overlapping with effective peaks in the chromatogram. Also, only one interface is required for a data processing device that calculates gas concentration and the like using the output value from the gas sensor 7C.

In addition, if the time difference between gas components A and D is small in FIG. 4, the gas horizontal time adjustment pipe 10 may be lengthened. The gas detection time adjusting pipe 10 of the housing can achieve the same effect even if it is provided before the second column 5d, and does not necessarily have to be after the second column 5d as in this embodiment. Furthermore, as the inner diameter of the gas detection time adjustment pipe 10 becomes larger, the peak of the chromatogram becomes broader, so it is preferable that the inner diameter is 4 sm or less.

Note that a four-way solenoid valve may be used as the four-way switching cell 11a, and the switching operation thereof may be linked to the six-way switching cell 2, and is not necessarily limited to manual operation.

As described above, in the present invention, since the tenth column and the second column having the gas detection time adjustment pipe are provided, the first
After the detection and measurement of the gas separated by the second column is completed, the gas separated by the second column can be detected and measured, and a series of continuous taromadograms of various gases can be obtained in a short time. Thus, it is possible to obtain a gas chromatograph apparatus that can obtain a series of continuous talomadograms of various gases in a short period of time.

[Brief explanation of the drawing]

Fig. 1 is a gas detection system diagram of a conventional gas chromatograph, Fig. 2 is a chromatogram of various gases measured with a conventional gas chromatograph, and Fig. 3 is an embodiment of the gas chromatograph of the present invention. The gas detection system diagram, FIG. 4, is a chromatogram of +m gas measured with the gas chromatograph apparatus of the present invention. 1...Gas measuring tube, 2...Switching valve (six-way switching 9F)
, s... column, 5C... first column, 5d.
...Second column, 7C...Gas sensor, 10...
・Gas detection Ml adjustment vibrator, 11...Column switching valve, 11a...4□ Time circle

Claims (1)

[Claims] 1. A gas measuring tube, a column connected to the gas measuring tube via a switching valve that switches the flow path of the carrier gas, and a column that separates the type of gas, and a column connected to the column that separates into 1. In a gas chromatograph apparatus having a gas sensor for detecting a gaseous substance, the column is connected to a first column whose one end is connected to the switching valve, and a column parallel to the first column; 1 column and the gas sensor column switching 9P't-,
and a second column having a gas detection time adjustment pipe, and when the column switching valve communicates between the tenth column and the gas sensor, the outlet of the second column is opened to the atmosphere. A gas chromatograph apparatus characterized in that, when the second column and the gas sensor are communicated with each other, the outlet of the first column is switched and connected so as to be open to the atmosphere. 2. The gas detection time adjustment pipe has an inner diameter of 4π.
A gas chromatograph apparatus according to claim 1, which is as follows. 3. The gas chromatograph apparatus according to claim 1, wherein the column switching valve is a four-way solenoid valve. 4. The gas chromatograph apparatus according to claim 3, wherein the four-way solenoid valve operates after a predetermined period of time has elapsed after the gas in the gas measuring tube flows into the column.