CN117890493A - Method for improving performance of non-methane total hydrocarbon instrument in ambient air - Google Patents
Method for improving performance of non-methane total hydrocarbon instrument in ambient air Download PDFInfo
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- CN117890493A CN117890493A CN202311683983.9A CN202311683983A CN117890493A CN 117890493 A CN117890493 A CN 117890493A CN 202311683983 A CN202311683983 A CN 202311683983A CN 117890493 A CN117890493 A CN 117890493A
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- ambient air
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000012080 ambient air Substances 0.000 title claims abstract description 41
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 38
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 27
- 239000012159 carrier gas Substances 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims abstract description 4
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims abstract 10
- 230000002708 enhancing effect Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 101100023111 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mfc1 gene Proteins 0.000 claims description 6
- 238000011002 quantification Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 239000003570 air Substances 0.000 abstract description 16
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 150000001555 benzenes Chemical class 0.000 description 29
- 238000012360 testing method Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229940078552 o-xylene Drugs 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention discloses a method for improving the performance of an environmental air non-methane total hydrocarbon instrument, which relates to the technical field of gas detection, wherein 1 six-way diaphragm valve is replaced by 1 10-way diaphragm valve, 1 pre-separation chromatographic column is added, 1 path of carrier gas (carrier gas 5) is added, and gas which originally passes through only 1 chromatographic column passes through 2 chromatographic columns with different column effects now and is detected in FI D2. The method in this flowchart has two states: sampling state and analysis state, sampling state: sample gas enters the diaphragm valves V1 and V3 from the sample gas inlet respectively, the diaphragm valves V1 and V2 are used for completing the sampling and analysis of methane and non-methane total hydrocarbons in the ambient air, and the diaphragm valve V3 is used for completing the sampling and analysis of benzene series in the ambient air. By adjusting the sampling flow path and adding a new chromatographic column, the benzene series can be obviously observed to be well separated by observing the spectrogram, and the repeatability of the benzene series is improved and the periodical change is obviously reduced as can be seen from the table data.
Description
Technical Field
The invention relates to the technical field of bookshelf, in particular to a method for improving the performance of an environmental air non-methane total hydrocarbon instrument.
Background
And (3) sampling methane, non-methane total hydrocarbon and benzene compounds in ambient air at a low temperature adsorption (-6 ℃) in an enrichment module by adopting a diaphragm valve group (comprising two six-way valves and one ten-way valve), then desorbing gas adsorbed by an enrichment device at a high temperature (200-330 ℃), introducing the desorbed gas into a chromatographic column for separation, and finally, introducing the desorbed gas into an FID (hydrogen flame ion) detector for detection.
The methane is separated and detected by a chromatographic column, the non-methane total hydrocarbon is detected by a direct measurement method, the gas in the direct desorption enrichment module is introduced into the FID1 for detection, and the benzene series is separated and introduced into the F ID2 for detection by the chromatographic column after enrichment. The whole analysis flow is 600s. The whole system basically can run stably for a long time, but still has some problems.
However, in the implementation process of the technical scheme, at least the following technical problems are found:
the baseline signal is noisy, and for low concentration gases, especially methane in air, the fluctuation of the baseline can greatly affect the results of the test due to the low response value of the meter itself to methane (which is due to the low molecular weight of methane itself and the weak signal generated by combustion in the hydrogen flame ion detector).
The degree of separation of benzene series is not satisfied, wherein the degree of separation of o-xylene and styrene is required to be greater than 1. The chromatographic peak of benzene series is periodically fluctuated to influence the test result, and therefore, a method for improving the performance of the environment air non-methane total hydrocarbon instrument is provided.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a method for improving the performance of an ambient air non-methane total hydrocarbon instrument, and solves the technical problems in the background art.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a method for improving the performance of non-methane total hydrocarbon instrument in ambient air features that 1 six-way diaphragm valve is replaced by 1 10-way diaphragm valve, 1 pre-separation chromatographic column is added, 1 path of carrier gas (carrier gas 5) is added, and the gas passing through 1 chromatographic column passes through 2 chromatographic columns with different column effects and is detected in FID 2.
Preferably, the method in this flowchart has two states: a sampling state and an analysis state,
sampling state: sample gas enters the diaphragm valves V1 and V3 from the sample gas inlet respectively, the diaphragm valves V1 and V2 are used for completing the sampling and analysis of methane and non-methane total hydrocarbons in the ambient air, and the diaphragm valve V3 is used for completing the sampling and analysis of benzene series in the ambient air.
Preferably, the sample gas enters from the sample gas inlet into the No. 8 port of the diaphragm valve V1, enters from the No. 9 port into the quantitative ring of methane for quantification, enters from the No. 6 port of the diaphragm valve V1 after passing through the quantitative ring, enters from the No. 7 port into the No. 6 port of the diaphragm valve V2, enters from the No. 1 port of the diaphragm valve V2 into the enrichment module 1 for low-temperature adsorption of non-methane total hydrocarbons in the ambient air, enters from the No. 4 port of the diaphragm valve V2 after passing through the enrichment module 1, enters from the No. 5 port into the mass flow controller MFC1, enters into the pump 1 after passing through the mass flow controller MFC1, and finally is emptied.
Preferably, the sampling process of benzene series in the ambient air is that the sample gas enters the No. 8 port of the diaphragm valve V3 from the sample gas inlet, enters the enrichment module 2 from the No. 9 port to carry out low-temperature adsorption on the benzene series in the ambient air, and the sample gas enters the No. 6 port of the diaphragm valve V3 after passing through the enrichment module 2, then enters the mass flow controller MFC2 from the No. 7 port, and enters the pump 2 after passing through the mass flow controller MFC2, and finally is emptied.
Preferably, in the sampling process, the carrier gas 1 enters from the No. 10 port of the diaphragm valve V1, exits from the No. 1 port, passes through the methane column, sweeps the methane column, enters into the No. 5 port of the diaphragm valve V1 after the sweeping is completed, and then is discharged from the No. 4 port.
Preferably, the carrier gas 2 enters from the No. 3 port of the diaphragm valve V1, and finally enters the detector 1 from the No. 2 port, so that the flow balance of the carrier gas before and after the valve cutting of the detector 1 is maintained.
Preferably, the carrier gas 3 enters from port No. 3 of the diaphragm valve V2, exits from port No. 2 to finally carry out the detector 1, and exits from the discharge port of the detector 1.
Preferably, the carrier gas 4 enters from the No. 5 port of the diaphragm valve V3, the No. 4 port enters into the pre-separation column of benzene series, the pre-separation column is purged, the carrier gas 4 enters into the No. 10 port of the diaphragm valve V3 after the purging of the pre-separation column is completed, and the carrier gas is discharged from the No. 1 port.
Preferably, the carrier gas 5 enters from the port No. 2 of the diaphragm valve V3, exits from the port No. 3, enters into the benzene series separation column, sweeps the benzene series separation column, enters the detector 2 after the carrier gas 5 sweeps the benzene series separation column, and is discharged from the discharge port of the detector 2.
(III) beneficial effects
1. The air storage tank is added at the zero-order air outlet, so that the combustion air of the detector is stable, the baseline is stable, the influence of baseline fluctuation on the test is reduced, after the air storage tank is added, the baseline tends to be stable, the fluctuation is small, benzene series can be well separated, the data show that the peak height of the baseline noise is about 0.18mV, and the peak height of the components to be detected is far lower than the peak height of the components to be detected, and after the air storage tank is added, the repeatability and the accuracy of methane and non-methane total hydrocarbon are greatly improved.
2. By adjusting the sampling flow path and adding a new chromatographic column, the benzene series can be obviously observed and well separated by observing the spectrogram. From the table data, the repeatability of benzene series is improved, the periodical change is obviously reduced, and the stability is improved.
Drawings
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
FIG. 1 is a prior art flow chart of a method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with the present invention;
FIG. 2 is a prior art flow chart of a method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with the present invention;
FIG. 3 is a baseline noise plot of a method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with the present invention;
FIG. 4 is a graph of methane and non-methane total hydrocarbons repeatability and accuracy of a method of enhancing the performance of an ambient air non-methane total hydrocarbons meter according to the invention;
FIG. 5 is a graph of a benzene series 24h range drift of 20% F.S. for a method of enhancing the performance of an ambient air non-methane total hydrocarbon meter according to the present invention;
FIG. 6 is a graph of 80% F.S. of 24h range drift of benzene series for a method of enhancing the performance of an ambient air non-methane total hydrocarbon meter according to the present invention.
Detailed Description
According to the method for improving the performance of the non-methane total hydrocarbon instrument in the ambient air, the problem that baseline signal noise greatly influences the test result in the prior art is solved, and the air storage tank is added to the zero-order air outlet, so that combustion air of the detector is stable, the baseline is stable, and the influence on the test caused by baseline fluctuation is reduced.
Example 1
The technical scheme in the embodiment of the application aims to solve the problem that the baseline signal noise is large, the fluctuation of the baseline can greatly influence the test result, and the overall thought is as follows:
aiming at the problems in the prior art, the invention provides a method for improving the performance of an environmental air non-methane total hydrocarbon instrument, which is comprehensively shown in fig. 1 and 2, and based on the original scheme, 1 six-way diaphragm valve is replaced by 1 10-way diaphragm valve. 1 pre-separation chromatographic column is added, 1 path of carrier gas (carrier gas 5) is added, the gas which only passes through 1 chromatographic column passes through 2 chromatographic columns with different column effects, the separation of benzene series can be well realized, the detection is carried out in FID2,
this flow chart has two states: sampling state and analysis state
Sampling state: sample gas enters the diaphragm valves V1 and V3 from the sample gas inlet respectively, the diaphragm valves V1 and V2 are used for completing the sampling and analysis of methane and non-methane total hydrocarbons in the ambient air, and the diaphragm valve V3 is used for completing the sampling and analysis of benzene series in the ambient air. Sample gas enters from a sample gas inlet into a No. 8 port of a diaphragm valve V1, enters into a methane quantifying ring from a No. 9 port for quantification, enters into a No. 6 port of the diaphragm valve V1 after passing through the quantifying ring, enters into a No. 6 port of a diaphragm valve V2 after exiting from a No. 7 port, enters into an enrichment module 1 after exiting from a No. 1 port of the diaphragm valve V2, carries out low-temperature adsorption on non-methane total hydrocarbons in ambient air, enters into a No. 4 port of the diaphragm valve V2 after passing through the enrichment module 1, enters into a mass flow controller MFC1 after exiting from a No. 5 port, enters into a pump 1 after passing through the mass flow controller MFC1, and finally is emptied. This process is a sampling of the ambient air for methane and non-methane total hydrocarbons.
The sampling process of benzene series in the ambient air is that the sample gas enters the No. 8 port of the diaphragm valve V3 from the sample gas inlet, enters the enrichment module 2 from the No. 9 port for carrying out low-temperature adsorption on the benzene series in the ambient air, and the sample gas enters the No. 6 port of the diaphragm valve V3 after passing through the enrichment module 2, then enters the mass flow controller MFC2 from the No. 7 port, and enters the pump 2 after passing through the mass flow controller MFC2, and finally is emptied.
In the sampling process, the carrier gas 1 enters from a No. 10 port of the diaphragm valve V1, exits from a No. 1 port, passes through a methane column, sweeps the methane column, enters a No. 5 port of the diaphragm valve V1 after the sweeping is completed, and is discharged from a No. 4 port.
The carrier gas 2 enters from the No. 3 port of the diaphragm valve V1, and finally enters the detector 1 from the No. 2 port, so that the flow balance of the carrier gas before and after the valve cutting of the detector 1 is kept.
The carrier gas 3 enters from the port No. 3 of the diaphragm valve V2, exits from the port No. 2, finally proceeds to the detector 1, and exits from the discharge port of the detector 1.
The carrier gas 4 enters from a No. 5 port of the diaphragm valve V3, the No. 4 port enters into a pre-separation column of benzene series, the pre-separation column is purged, the carrier gas 4 enters into a No. 10 port of the diaphragm valve V3 after the pre-separation column is purged, and the carrier gas is discharged from a No. 1 port.
The carrier gas 5 enters from the No. 2 port of the diaphragm valve V3, the No. 3 port enters into the benzene series separation column, the benzene series separation column is purged, the carrier gas 5 enters into the detector 2 after the benzene series separation column is purged, and the carrier gas is discharged from the discharge port of the detector 2.
The flow chart also adds the functions of diversion and tail blowing to the detection of benzene series, and ensures the accurate and stable detection of benzene series in the ambient air.
The air storage tank is added to the zero-order air outlet, so that the combustion air of the detector is stabilized, the baseline is stabilized, and the influence of baseline fluctuation on the test is reduced.
As shown in FIG. 4, after the gas storage tank is added, the baseline is stable, the fluctuation is small, benzene series can be well separated, and the data show that the peak height of the baseline noise is about 0.18mV, is far lower than the peak height of the component to be tested, and accords with the test standard. In addition, after the gas storage tank is added, the repeatability and the accuracy of the total hydrocarbon of methane and non-methane are greatly improved, and the grading standard is met.
As shown in FIGS. 5-6, by adjusting the sampling flow path and adding a new chromatographic column, the benzene series can be obviously and well separated by observing the spectrogram. From the table data, the repeatability of benzene series is improved, the periodical change is obviously reduced, and the stability is improved.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
1. A method for improving the performance of an ambient air non-methane total hydrocarbon instrument, which is characterized in that: 1 six-way diaphragm valve is changed into 1 10-way diaphragm valve, 1 pre-separation chromatographic column is added, 1 path of carrier gas (carrier gas 5) is added, and the gas which originally passes through only 1 chromatographic column passes through 2 chromatographic columns with different column effects, and is detected in FID 2.
2. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter as claimed in claim 1, wherein: the method in this flowchart has two states: a sampling state and an analysis state,
sampling state: sample gas enters the diaphragm valves V1 and V3 from the sample gas inlet respectively, the diaphragm valves V1 and V2 are used for completing the sampling and analysis of methane and non-methane total hydrocarbons in the ambient air, and the diaphragm valve V3 is used for completing the sampling and analysis of benzene series in the ambient air.
3. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter as claimed in claim 2, wherein: sample gas enters from a sample gas inlet into a No. 8 port of a diaphragm valve V1, enters a quantifying ring of methane from a No. 9 port for quantification, enters a No. 6 port of the diaphragm valve V1 after passing through the quantifying ring, enters a No. 6 port of a diaphragm valve V2 after exiting from a No. 7 port, enters an enrichment module 1 after exiting from a No. 1 port of the diaphragm valve V2, carries out low-temperature adsorption on non-methane total hydrocarbons in ambient air, enters a No. 4 port of the diaphragm valve V2 after passing through the enrichment module 1, enters a mass flow controller MFC1 after exiting from a No. 5 port, enters a pump 1 after passing through the mass flow controller MFC1, and finally is emptied, wherein the process is to sample methane and non-methane total hydrocarbons in the ambient air.
4. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter as claimed in claim 3, wherein: the sampling process of benzene series in the ambient air is that the sample gas enters the No. 8 port of the diaphragm valve V3 from the sample gas inlet, enters the enrichment module 2 from the No. 9 port for carrying out low-temperature adsorption on the benzene series in the ambient air, and the sample gas enters the No. 6 port of the diaphragm valve V3 after passing through the enrichment module 2, then enters the mass flow controller MFC2 from the No. 7 port, and enters the pump 2 after passing through the mass flow controller MFC2, and finally is emptied.
5. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with claim 4, wherein: in the sampling process, the carrier gas 1 enters from a No. 10 port of the diaphragm valve V1, exits from a No. 1 port, passes through a methane column, sweeps the methane column, enters a No. 5 port of the diaphragm valve V1 after the sweeping is completed, and is discharged from a No. 4 port.
6. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with claim 5, wherein: the carrier gas 2 enters from the No. 3 port of the diaphragm valve V1, and finally enters the detector 1 from the No. 2 port, so that the flow balance of the carrier gas before and after the valve cutting of the detector 1 is kept.
7. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with claim 6, wherein: the carrier gas 3 enters from the port No. 3 of the diaphragm valve V2, exits from the port No. 2, finally proceeds to the detector 1, and exits from the discharge port of the detector 1.
8. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with claim 7, wherein: the carrier gas 4 enters from a No. 5 port of the diaphragm valve V3, the No. 4 port enters into a pre-separation column of benzene series, the pre-separation column is purged, the carrier gas 4 enters into a No. 10 port of the diaphragm valve V3 after the pre-separation column is purged, and the carrier gas is discharged from a No. 1 port.
9. A method of enhancing the performance of an ambient air non-methane total hydrocarbon meter in accordance with claim 8, wherein: the carrier gas 5 enters from the No. 2 port of the diaphragm valve V3, the No. 3 port enters into the benzene series separation column, the benzene series separation column is purged, the carrier gas 5 enters into the detector 2 after the benzene series separation column is purged, and the carrier gas is discharged from the discharge port of the detector 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311683983.9A CN117890493A (en) | 2023-12-08 | 2023-12-08 | Method for improving performance of non-methane total hydrocarbon instrument in ambient air |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311683983.9A CN117890493A (en) | 2023-12-08 | 2023-12-08 | Method for improving performance of non-methane total hydrocarbon instrument in ambient air |
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| Publication Number | Publication Date |
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| CN117890493A true CN117890493A (en) | 2024-04-16 |
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| CN202311683983.9A Pending CN117890493A (en) | 2023-12-08 | 2023-12-08 | Method for improving performance of non-methane total hydrocarbon instrument in ambient air |
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- 2023-12-08 CN CN202311683983.9A patent/CN117890493A/en active Pending
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