CN103007577A - Device for filling gas chromatographic column - Google Patents
Device for filling gas chromatographic column Download PDFInfo
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- CN103007577A CN103007577A CN2012105819299A CN201210581929A CN103007577A CN 103007577 A CN103007577 A CN 103007577A CN 2012105819299 A CN2012105819299 A CN 2012105819299A CN 201210581929 A CN201210581929 A CN 201210581929A CN 103007577 A CN103007577 A CN 103007577A
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Abstract
The invention relates to a device for filling a gas chromatographic column. The device comprises a high-pressure steel cylinder, a first four-way connector, a second four-way connector, an ion generator, a filling tank and a chromatographic column connector. An air outlet of the high-pressure steel cylinder is communicated with an air inlet of the first four-way connector through a general reducing valve, three air outlets of the first four-way connector are respectively communicated with air inlets of first, second and third switch valves, an air outlet of the first switch valve is communicated with an air inlet of the ion generator through a first branch reducing valve, an air outlet of the third switch valve is communicated with an air inlet of a third branch reducing valve, air outlets of the ion generator, the second switch valve and the third branch reducing valve are respectively communicated with first, second and third air inlets of the second four-way connector, an air outlet of the second four-way connector is communicated with an inlet of the filling tank, and an outlet of the filling tank is communicated with the chromatographic column connector. The device for filling the gas chromatographic column provided by the invention is simple in structure and high in filling efficiency.
Description
(1), technical field: the present invention relates to a kind of filling device, particularly a kind of device that loads gas chromatographic column.
(2), background technology: gas chromatography is a kind of widely used separate analytical technique, be widely used in the industries such as petrochemical industry, pharmacy, food, environmental protection, electric power, gas chromatography can effectively separate and quantitative analysis forming complicated mixture.Carry out gas chromatographic analysis and often use gas chromatograph, and chromatographic column is the core component of gas chromatograph, is described as the heart of gas chromatograph always, can the quality of chromatographic column and the whole gas chromatographic analysis of manufacturing stability relation realize smoothly.Existing chromatographic column contains packed column and capillary column, although that capillary column is used in present gas chromatograph is increasingly extensive, packed column is still practical in many analysis fields, sometimes or even can't replace.In general lab analysis, the packing method of packed column is vacuumizing method, and this method relatively is fit to the shorter packed column of filling Length Ratio, and the method filling efficient is low, and the packed column that length is surpassed 3.0m can't effectively be finished filling basically; Owing to when conventional packing method is implemented, needing a filling, be not suitable for the large quantities of pillar of scale filling, so that efficiency is low, and repeated bad between the chromatographic column of loading.
(3), summary of the invention:
The technical problem to be solved in the present invention is: not enough for prior art, a kind of device of simple in structure, filling gas chromatographic column that filling efficient is high is provided.
Technical scheme of the present invention:
A kind of device that loads gas chromatographic column, contain high-pressure cylinder, the total reduction valve, the first four-way connection, the first switch valve, first minute pressure-reducing valve, ion generator, the second switch valve, Pressure gauge, the 3rd switch valve, the 3rd minute pressure-reducing valve, the second four-way connection, filling tank and chromatographic column joint, dry gas is housed in the high-pressure cylinder, the gas outlet of high-pressure cylinder is communicated with the air inlet of the first four-way connection by the total reduction valve, three gas outlets of the first four-way connection respectively with the first switch valve, the second switch valve, the air inlet of the 3rd switch valve is communicated with, the gas outlet of the first switch valve is communicated with the air inlet of ion generator by first minute pressure-reducing valve, the gas outlet of ion generator is communicated with the first air inlet of the second four-way connection, the gas outlet of second switch valve is communicated with the second air inlet of the second four-way connection, the gas outlet of the 3rd switch valve is communicated with the 3rd air inlet of the second four-way connection by the 3rd minute pressure-reducing valve, the gas outlet of the second four-way connection is communicated with the entrance of filling tank, and the outlet of filling tank is communicated with the entrance of chromatographic column joint; On the connecting pipe between the second air inlet of the gas outlet of second switch valve and the second four-way connection Pressure gauge is installed; High-pressure cylinder, total reduction valve, the first four-way connection, the first switch valve, first minute pressure-reducing valve, ion generator, second switch valve, the 3rd switch valve, all be communicated with by the connecting pipe sealing between pressure-reducing valve, the second four-way connection, filling tank and the chromatographic column joint in the 3rd minute.
Filling tank contains tubular tank body, upper cover plate, lower cover, upper press cover, lower cover, upper conduit and the downcomer of upper and lower end opening; Upper cover plate and lower cover are circular cover, the geomery of upper cover plate and lower cover respectively with the geomery of tubular tank body top and bottom coupling, upper cover plate and lower cover are sealedly connected on respectively the top and bottom of tubular tank body, the upper end of upper conduit is the entrance of filling tank, the lower end of upper conduit is fixedly installed on the middle part of upper cover plate upper surface, the lower end of downcomer is the outlet of filling tank, the upper end of downcomer is fixedly installed on the middle part of lower cover lower surface, and the inside of upper conduit and downcomer is communicated with the tubular tank interior; Upper press cover and lower cover are bottle-cover-shape, and the bottom center of upper press cover and lower cover is hollow-core construction, be equipped with internal thread on the madial wall of upper press cover and lower cover, be equipped with external screw thread on the outer wall of the top and bottom of tubular tank body, the bottom of upper press cover is pressed in the upper surface of upper cover plate, the upper side of upper press cover and tubular tank body is threaded connection together, thereby upper cover plate is pressed on the upper end of tubular tank body, the bottom of lower cover is pressed in the lower surface of lower cover, the lower end side of lower cover and tubular tank body is threaded connection together, thereby lower cover is pressed on the lower end of tubular tank body; The chromatographic column joint contains fittings body, below fittings body, be provided with an entrance, be provided with N outlet on fittings body, the communicating passage by fittings body inside between the entrance of chromatographic column joint and N outlet is interconnected, and N is the natural number more than or equal to 1.
The upper end face of tubular tank body is provided with annular groove, is provided with sealing ring in the upper annular groove, and the rear surface of tubular tank body is provided with lower annular groove, is provided with lower seal in the lower annular groove; The exit, lower end of upper conduit is provided with filter block, and filter block has the effect of the filler recoil that prevents in the tubular tank body; The upper surface of lower cover is the sphere to lower recess.When the sphere of lower recess helps filler to add in the tubular tank body, avoid extruding and broken, filler is flowed in the downcomer fully.
The material of tubular tank body is transparent PC pipe, stainless steel tube or borosilicate glass, and the tubular tank body will have certain thickness, and can tolerate the pressure of 1.5MPa, the length of tubular tank body can be about 40cm, about diameter 5cm.The material of upper press cover and lower cover is aluminium; The material of filter block is sintered filter core; The material of upper conduit and downcomer is stainless steel tube; Upper conduit and downcomer are welded on respectively on upper cover plate and the lower cover; The upper face center of upper cover plate is provided with round boss, the hollow-core construction coupling of upper round boss and upper press cover bottom center, and the lower surface central authorities of lower cover are provided with lower round boss, the hollow-core construction coupling of lower round boss and lower cover bottom center.
Fittings body is N pyramid stage body and cylindrical assembly, lower end and the cylindrical upper end of N pyramid stage body link together, the entrance of chromatographic column joint is the ingate that is located on the cylindrical lower surface, the N of chromatographic column joint exports N the outlet opening that is respectively on N the side that is located at N pyramid stage body, and the communicating passage by fittings body inside between ingate and the N outlet opening is interconnected; The lower end of the downcomer of filling tank is communicated with the ingate of fittings body by a chromatographic column joint connecting pipe, and an end of chromatographic column joint connecting pipe is installed in the ingate of fittings body by a fixed cover.
Fixed cover is fixedly set in an end of chromatographic column joint connecting pipe, and the outer wall of fixed cover is provided with external screw thread, and the inwall of fittings body ingate is provided with internal thread, and the inwall of the outer wall of fixed cover and fittings body ingate is threaded connection; The N of a chromatographic column joint outlet opening is stepped hole.
N preferentially is chosen as 4～8.
Dry gas is dry nitrogen or air in the high-pressure cylinder, and the total reduction valve is conventional oxygen or air reducing valve, and first minute pressure-reducing valve and the 3rd minute pressure-reducing valve are small-sized oxygen or air reducing valve; Ion generator is the small ion generator; The first switch valve, second switch valve are identical with the model specification of the 3rd switch valve.
The volume of high-pressure cylinder can be 40L, can be 10L also, guarantees in the use that remaining gas pressure is not less than 1.5MPa.Manometric reading fixedly is in 1.0MPa.The range of first minute pressure-reducing valve and the 3rd minute pressure-reducing valve pressure gauge can with the total reduction valve on the same, also can be than on the total reduction valve less.Manometric range is preferably selected 0 MPa～2.5MPa.
The small ion generator is the commercial midget plant that can launch cation or anion, its function is: regularly the pipeline for the back provides a certain amount of ion current, with eliminate in the pipeline between the filler and tank body, friction and the static that produces between filler and the filler.
The model of small ion generator is: SJ-M020G, manufacturer is: Co., Ltd in the Keyemce.
The using method of the device of this filling gas chromatographic column is as follows:
⑴ open the first switch valve, second switch valve and the 3rd switch valve, regulate the low-pressure end Pressure gauge of total reduction valve to 1.0MPa, the low-pressure end Pressure gauge of the 3rd minute pressure-reducing valve is to 0.35Mpa, waiting for a period of time makes the small ion generator launch an amount of cation or anion in pipeline, then closes the first switch valve, second switch valve and the 3rd switch valve.
Will through coating, the fixed phase stuffing of preliminary burin-in process packs in the tubular tank body, and an end plug of every root chromatogram column is entered mineral wool and silk screen, then its other end sealing is fastened on during N of chromatographic column joint export.
⑶ open the 3rd switch valve, allows air-flow that filler is blown in every root chromatogram column, constantly vibrates simultaneously or beat the chromatographic column tube wall.
⑷ close the 3rd switch valve after filler is full of every root chromatogram column, open the second switch valve, constantly vibrates simultaneously chromatographic column, pressurizeed 2 minutes, and then close the second switch valve.
⑸ unload every root chromatogram column after manometric pressure is designated as zero, namely finished the filling of chromatographic column.
Beneficial effect of the present invention:
1. the present invention's preparative gas chromatography packed column quickly and easily, simple and easy to operate, can carry out the batch production of gas-chromatography packed column, guarantee the stability of gas-chromatography packed column quality, and solved the technical problem that Routine Test Lab is difficult to prepare the above long chromatography packed column of 5m.The used time of pillar of utilizing the present invention to load 10 4.0m is no more than 10min, and just needs about 20min with 1 same pillar of conventional method filling, has greatly improved the efficiency of filling process.
2. the present invention is simple in structure, easy to make, and employed parts all are easily processing or the easy conventional accessory of buying.
(4), description of drawings:
Fig. 1 is the structural representation of the device of filling gas chromatographic column;
Fig. 2 is the structural representation of filling tank and chromatographic column joint;
Fig. 3 is the three-dimensional structure for amplifying schematic diagram of chromatographic column joint.
(5), the specific embodiment:
Referring to Fig. 1～Fig. 3, among the figure, the device of filling gas chromatographic column contains high-pressure cylinder 1, total reduction valve 2, the first four-way connection 3, the first switch valve 4, pressure-reducing valve 5 in first minute, ion generator 6, second switch valve 7, Pressure gauge 8, the 3rd switch valve 9, the 3rd minute pressure-reducing valve 10, the second four-way connection 11, filling tank 12 and chromatographic column joint 13, dry gas is housed in the high-pressure cylinder 1, the gas outlet of high-pressure cylinder 1 is communicated with the air inlet of the first four-way connection 3 by total reduction valve 2, three gas outlets of the first four-way connection 3 respectively with the first switch valve 4, second switch valve 7, the air inlet of the 3rd switch valve 9 is communicated with, the gas outlet of the first switch valve 4 is communicated with the air inlet of ion generator 6 by first minute pressure-reducing valve 5, the gas outlet of ion generator 6 is communicated with the first air inlet of the second four-way connection 11, the gas outlet of second switch valve 7 is communicated with the second air inlet of the second four-way connection 11, the gas outlet of the 3rd switch valve 9 is communicated with the 3rd air inlet of the second four-way connection 11 by the 3rd minute pressure-reducing valve 10, the gas outlet of the second four-way connection 11 is communicated with the entrance of filling tank 12, and the outlet of filling tank 12 is communicated with the entrance of chromatographic column joint 13; On the connecting pipe between the second air inlet of the gas outlet of second switch valve 7 and the second four-way connection 11 Pressure gauge 8 is installed; High-pressure cylinder 1, total reduction valve 2, the first four-way connection 3, the first switch valve 4, first minute pressure-reducing valve 5, ion generator 6, second switch valve 7, the 3rd switch valve 9, all be communicated with by the connecting pipe sealing between pressure-reducing valve 10, the second four-way connection 11, filling tank 12 and the chromatographic column joint 13 in the 3rd minute.
Filling tank 12 contains tubular tank body 14, upper cover plate 17, lower cover 18, upper press cover 19, lower cover 20, upper conduit 15 and the downcomer 16 of upper and lower end opening; Upper cover plate 17 and lower cover 18 are circular cover, the geomery of upper cover plate 17 and lower cover 18 respectively with the geomery of tubular tank body 14 top and bottom coupling, upper cover plate 17 and lower cover 18 are sealedly connected on respectively the top and bottom of tubular tank body 14, the upper end of upper conduit 15 is the entrance of filling tank 12, the lower end of upper conduit 15 is fixedly installed on the middle part of upper cover plate 17 upper surfaces, the lower end of downcomer 16 is the outlet of filling tank 12, the upper end of downcomer 16 is fixedly installed on the middle part of lower cover 18 lower surfaces, and the inside of upper conduit 15 and downcomer 16 and tubular tank body 14 internal communication; Upper press cover 19 and lower cover 20 are bottle-cover-shape, and the bottom center of upper press cover 19 and lower cover 20 is hollow-core construction, be equipped with internal thread on the madial wall of upper press cover 19 and lower cover 20, be equipped with external screw thread on the outer wall of the top and bottom of tubular tank body 14, the bottom of upper press cover 19 is pressed in the upper surface of upper cover plate 17, upper press cover 19 is threaded connection together with the upper side of tubular tank body 14, thereby upper cover plate 17 is pressed on the upper end of tubular tank body 14, the bottom of lower cover 20 is pressed in the lower surface of lower cover 18, lower cover 20 is threaded connection together with the lower end side of tubular tank body 14, thereby lower cover 18 is pressed on the lower end of tubular tank body 14; Chromatographic column joint 13 contains fittings body 24, is provided with an entrance below fittings body 24, is provided with 6 outlets on fittings body 24, and the communicating passage by fittings body 24 inside between the entrance of chromatographic column joint 13 and 6 outlets is interconnected.
The upper end face of tubular tank body 14 is provided with annular groove, is provided with sealing ring 21 in the upper annular groove, and the rear surface of tubular tank body 14 is provided with lower annular groove, is provided with lower seal 22 in the lower annular groove; The exit, lower end of upper conduit 15 is provided with filter block 23, and filter block 23 has the effect of the filler recoil that prevents in the tubular tank body 14; The upper surface of lower cover 18 is the sphere to lower recess, helps filler to add that tubular tank body 14 is avoided extruding when interior and broken to the sphere of lower recess, and filler is flowed in the downcomer 16 fully.
The material of tubular tank body 14 is transparent PC pipe, and tubular tank body 14 will have certain thickness, and can tolerate the pressure of 1.5MPa, the length of tubular tank body 14 can be about 40cm, about diameter 5cm.The material of upper press cover 17 and lower cover 18 is aluminium; The material of filter block 23 is sintered filter core; The material of upper conduit 15 and downcomer 16 is stainless steel tube; Upper conduit 15 and downcomer 16 are welded on respectively on upper cover plate 17 and the lower cover 18; The upper face center of upper cover plate 17 is provided with round boss, the hollow-core construction coupling of upper round boss and upper press cover 19 bottom center, and the lower surface central authorities of lower cover 18 are provided with lower round boss, the hollow-core construction coupling of lower round boss and lower cover 20 bottom center.
Fixed cover 25 is fixedly set in an end of chromatographic column joint connecting pipe 28, and the outer wall of fixed cover 25 is provided with external screw thread, and the inwall of fittings body ingate 29 is provided with internal thread, and the inwall of the outer wall of fixed cover 25 and fittings body ingate 29 is threaded connection; 6 outlet openings 26 of chromatographic column joint 13 are stepped hole.
Dry gas is dry nitrogen or air in the high-pressure cylinder 1, and total reduction valve 2 is conventional oxygen or air reducing valve, and first minute pressure-reducing valve 5 and the 3rd minute pressure-reducing valve 10 are small-sized oxygen or air reducing valve; Ion generator 6 is the small ion generator; The first switch valve 4, second switch valve 7 are identical with the model specification of the 3rd switch valve 9.
The volume of high-pressure cylinder 1 can be 40L, can be 10L also, guarantees in the use that remaining gas pressure is not less than 1.5MPa.The reading of Pressure gauge 8 fixedly is in 1.0MPa.The range of first minute pressure-reducing valve 5 and the 3rd minute pressure-reducing valve 10 pressure gauges can with total reduction valve 2 on the same, also can be than on the total reduction valve 2 less.The range of Pressure gauge 8 is preferably selected 0 MPa～2.5MPa.
The small ion generator is the commercial midget plant that can launch cation or anion, its function is: regularly the pipeline for the back provides a certain amount of ion current, with eliminate in the pipeline between the filler and tank body, friction and the static that produces between filler and the filler.
The model of small ion generator is: SJ-M020G, manufacturer is: Co., Ltd in the Keyemce.
The using method of the device of this filling gas chromatographic column is as follows:
⑴ open the first switch valve 4, second switch valve 7 and the 3rd switch valve 9, regulate the low-pressure end Pressure gauge of total reduction valve 2 to 1.0MPa, the low-pressure end Pressure gauge of the 3rd minute pressure-reducing valve 10 is to 0.35Mpa, waiting for a period of time makes the small ion generator launch an amount of cation or anion in pipeline, then closes the first switch valve 4, second switch valve 7 and the 3rd switch valve 9.
Will through coating, the fixed phase stuffing of preliminary burin-in process packs in the tubular tank body 14, and an end plug of 6 root chromatogram columns is entered mineral wool and silk screen, then its other end sealing is fastened in 6 outlet openings 26 of chromatographic column joint 13.
⑶ open the 3rd switch valve 9, allows air-flow that filler is blown in every root chromatogram column, constantly vibrates simultaneously or beat the chromatographic column tube wall.
⑷ close the 3rd switch valve 9 after filler is full of every root chromatogram column, open second switch valve 7, constantly vibrates simultaneously chromatographic column, pressurizeed 2 minutes, and then close second switch valve 7.
⑸ unload every root chromatogram column after the pressure of Pressure gauge 8 is designated as zero, namely finished the filling of chromatographic column.
Claims (8)
1. device that loads gas chromatographic column, it is characterized in that: contain high-pressure cylinder, the total reduction valve, the first four-way connection, the first switch valve, first minute pressure-reducing valve, ion generator, the second switch valve, Pressure gauge, the 3rd switch valve, the 3rd minute pressure-reducing valve, the second four-way connection, filling tank and chromatographic column joint, dry gas is housed in the high-pressure cylinder, the gas outlet of high-pressure cylinder is communicated with the air inlet of the first four-way connection by the total reduction valve, three gas outlets of the first four-way connection respectively with the first switch valve, the second switch valve, the air inlet of the 3rd switch valve is communicated with, the gas outlet of the first switch valve is communicated with the air inlet of ion generator by first minute pressure-reducing valve, the gas outlet of ion generator is communicated with the first air inlet of the second four-way connection, the gas outlet of second switch valve is communicated with the second air inlet of the second four-way connection, the gas outlet of the 3rd switch valve is communicated with the 3rd air inlet of the second four-way connection by the 3rd minute pressure-reducing valve, the gas outlet of the second four-way connection is communicated with the entrance of filling tank, and the outlet of filling tank is communicated with the entrance of chromatographic column joint; On the connecting pipe between the second air inlet of the gas outlet of second switch valve and the second four-way connection Pressure gauge is installed; High-pressure cylinder, total reduction valve, the first four-way connection, the first switch valve, first minute pressure-reducing valve, ion generator, second switch valve, the 3rd switch valve, all be communicated with by the connecting pipe sealing between pressure-reducing valve, the second four-way connection, filling tank and the chromatographic column joint in the 3rd minute.
2. the device of filling gas chromatographic column according to claim 1, it is characterized in that: described filling tank contains tubular tank body, upper cover plate, lower cover, upper press cover, lower cover, upper conduit and the downcomer of upper and lower end opening; Upper cover plate and lower cover are circular cover, the geomery of upper cover plate and lower cover respectively with the geomery of tubular tank body top and bottom coupling, upper cover plate and lower cover are sealedly connected on respectively the top and bottom of tubular tank body, the upper end of upper conduit is the entrance of filling tank, the lower end of upper conduit is fixedly installed on the middle part of upper cover plate upper surface, the lower end of downcomer is the outlet of filling tank, the upper end of downcomer is fixedly installed on the middle part of lower cover lower surface, and the inside of upper conduit and downcomer is communicated with the tubular tank interior; Upper press cover and lower cover are bottle-cover-shape, and the bottom center of upper press cover and lower cover is hollow-core construction, be equipped with internal thread on the madial wall of upper press cover and lower cover, be equipped with external screw thread on the outer wall of the top and bottom of tubular tank body, the bottom of upper press cover is pressed in the upper surface of upper cover plate, the upper side of upper press cover and tubular tank body is threaded connection together, thereby upper cover plate is pressed on the upper end of tubular tank body, the bottom of lower cover is pressed in the lower surface of lower cover, the lower end side of lower cover and tubular tank body is threaded connection together, thereby lower cover is pressed on the lower end of tubular tank body; Described chromatographic column joint contains fittings body, below fittings body, be provided with an entrance, be provided with N outlet on fittings body, the communicating passage by fittings body inside between the entrance of chromatographic column joint and N outlet is interconnected, and N is the natural number more than or equal to 1.
3. the device of filling gas chromatographic column according to claim 2, it is characterized in that: the upper end face of described tubular tank body is provided with annular groove, be provided with sealing ring in the upper annular groove, the rear surface of tubular tank body is provided with lower annular groove, is provided with lower seal in the lower annular groove; The exit, lower end of upper conduit is provided with filter block; The upper surface of lower cover is the sphere to lower recess.
4. the device of filling gas chromatographic column according to claim 3, it is characterized in that: the material of described tubular tank body is transparent PC pipe, stainless steel tube or borosilicate glass; The material of upper press cover and lower cover is aluminium; The material of filter block is sintered filter core; The material of upper conduit and downcomer is stainless steel tube; Upper conduit and downcomer are welded on respectively on upper cover plate and the lower cover; The upper face center of upper cover plate is provided with round boss, the hollow-core construction coupling of upper round boss and upper press cover bottom center, and the lower surface central authorities of lower cover are provided with lower round boss, the hollow-core construction coupling of lower round boss and lower cover bottom center.
5. the device of filling gas chromatographic column according to claim 2, it is characterized in that: described fittings body is N pyramid stage body and cylindrical assembly, lower end and the cylindrical upper end of N pyramid stage body link together, the entrance of chromatographic column joint is the ingate that is located on the cylindrical lower surface, the N of chromatographic column joint exports N the outlet opening that is respectively on N the side that is located at N pyramid stage body, and the communicating passage by fittings body inside between ingate and the N outlet opening is interconnected; The lower end of the downcomer of described filling tank is communicated with the ingate of fittings body by a chromatographic column joint connecting pipe, and an end of chromatographic column joint connecting pipe is installed in the ingate of fittings body by a fixed cover.
6. the device of filling gas chromatographic column according to claim 5, it is characterized in that: described fixed cover is fixedly set in an end of chromatographic column joint connecting pipe, the outer wall of fixed cover is provided with external screw thread, the inwall of fittings body ingate is provided with internal thread, and the inwall of the outer wall of fixed cover and fittings body ingate is threaded connection; The N of a chromatographic column joint outlet opening is stepped hole.
7. the device of filling gas chromatographic column according to claim 2, it is characterized in that: described N is 4～8.
8. the device of filling gas chromatographic column according to claim 1, it is characterized in that: gas dry in the described high-pressure cylinder is dry nitrogen or air, the total reduction valve is conventional oxygen or air reducing valve, and first minute pressure-reducing valve and the 3rd minute pressure-reducing valve are small-sized oxygen or air reducing valve; Ion generator is the small ion generator; The first switch valve, second switch valve are identical with the model specification of the 3rd switch valve.
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| CN104931629A (en) * | 2015-06-19 | 2015-09-23 | 武汉理工大学 | Micro-packed chromatographic column used for measuring total organic pollutant in air and preparation method and use method of micro-packed chromatographic column |
| CN109030690A (en) * | 2018-09-29 | 2018-12-18 | 兰州东立龙信息技术有限公司 | A kind of capillary chromatographic column coating unit |
| CN113188041A (en) * | 2021-05-05 | 2021-07-30 | 南通海泰科特精密材料有限公司 | Balance system and process for controlling pressure and temperature in pressure container |
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| Publication number | Publication date |
|---|---|
| CN103007577B (en) | 2015-01-14 |
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Effective date of registration: 20141128 Address after: 476000 No. 66 Tengfei Road, Shangqiu economic and Technological Development Zone, Henan, China Applicant after: Henan Zhongfen Instrument Co., Ltd. Applicant after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 476000 No. 66 Tengfei Road, Shangqiu economic and Technological Development Zone, Henan, China Applicant before: Henan Zhongfen Instrument Co., Ltd. |
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