CN1055997C - Gravimetric static adsorption instrument - Google Patents
Gravimetric static adsorption instrument Download PDFInfo
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- CN1055997C CN1055997C CN 93105554 CN93105554A CN1055997C CN 1055997 C CN1055997 C CN 1055997C CN 93105554 CN93105554 CN 93105554 CN 93105554 A CN93105554 A CN 93105554A CN 1055997 C CN1055997 C CN 1055997C
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- high vacuum
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 36
- 230000003068 static effect Effects 0.000 title claims description 16
- 239000011521 glass Substances 0.000 claims abstract description 84
- 239000002156 adsorbate Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 21
- 238000010168 coupling process Methods 0.000 claims description 21
- 238000005859 coupling reaction Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 230000008676 import Effects 0.000 claims description 16
- 230000000740 bleeding effect Effects 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 10
- 210000001503 joint Anatomy 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 229920001973 fluoroelastomer Polymers 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000007789 sealing Methods 0.000 abstract description 10
- 239000003463 adsorbent Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- LONQTZORWVBHMK-UHFFFAOYSA-N [N].NN Chemical compound [N].NN LONQTZORWVBHMK-UHFFFAOYSA-N 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000002594 sorbent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The invention relates to a measuring instrument for measuring the weight change of adsorption or desorption of an adsorption material. The instrument consists of an air extractor, an adsorbate sample adding device, a vacuum chamber, a pressure measuring device, an adsorbate measuring device and a temperature control device. The instrument adopts an ultrahigh vacuum valve and an ultrahigh vacuum fine-tuning valve to replace a traditional oil-coated glass piston, and adopts a metal-glass sealing technology to install the valves in a glass pipeline; glass detachable joint with ultrahigh vacuum performance is designed to replace transmissionThe oil-coated glass ground joint of the system. And a liquid nitrogen hydrazine cooling device is designed. The instrument can accurately, reliably and conveniently measure 0.1 to 105Adsorption and desorption isotherms of adsorbates such as Pa organic vapor on microporous adsorbents such as activated carbon.
Description
The present invention is the surveying instrument of the weight change of a kind of absorption of measuring sorbing material or desorb.
Measure adsorption isothermal and the desorption isotherm of adsorbate on adsorbents such as activated charcoal, molecular sieve such as organic steam under low pressure, can adopt Weight method static adsorption instrument.Weight method static adsorption instrument comprises six parts: (1) part of bleeding; (2) adsorbate application of sample part; (3) vacuum chamber; (4) pressure survey part; (5) adsorbance measure portion; (6) temperature control part branch.The main pipeline of common Weight method static adsorption instrument is to adopt glass pipe mostly, and glass pipe is compared with metallic conduit, and the adsorptive power of tube wall is poor, and is more suitable as the pipeline of absorption instrument.Adopt glass pipe generally to be to use the oiling glass piston to cut apart pipeline, use sinter funnel and oiling glass piston to carry out the application of sample of adsorbate steam, use oiling glass ground joint joint to carry out removable connection.From the angle of experimental data, can only measure the above organic steam adsorption isothermal of 10Pa with common Weight method static adsorption instrument to P/Ps about 0.9, if measure the following adsorption isothermal of 10Pa, then experimental error is too big.Reasons of error is mainly caused by following several respects: (1) because adopt glass piston and the removable coupling head of grournd glass, make the vacuum performance of vacuum chamber bad due to.(2) because adopt glass piston and grournd glass detachable fitting, the vacuum performance of adsorbate sampling system is bad, and under low pressure the sample introduction of adsorbate is operated uncontrollable.(3) because between employing oiling glass piston, oiling glass ground joint joint and vacuum chamber and the extract system cold hydrazine is not set, there be the micropollutant such as the pump oil vapour of easy sorption in the vacuum chamber, vacuum grease steam etc.(4) because adopt the coupling head of oiling grournd glass, easily polluted by vacuum grease in the adsorption tube, these vacuum greases shift in the high temperature high vacuum degassing processing procedure of sample of sorbent, and part covers on the sample of sorbent.Therefore, set up the Weight method static adsorption instrument of a new generation, need solve above-mentioned several of main problems, a series of problems that cause experimental error that promptly solve by the coupling head of oiling glass piston oiling grournd glass and cold hydrazine is not set and is brought.
The objective of the invention is to realize that one overlaps and can measure 0.1 to 10 accurately, reliably, easily
5Absorption and the desorb isothermal Weight method static adsorption instruments of adsorbate in micro-porous adsorption agent such as activated charcoal such as Pa organic steam.
Main points of the present invention are to adopt ultrahigh vacuum valve, ultrahigh vacuum micrometering valve in this instrument, replacing traditional oiling glass piston, and adopt the metal-glass sealing technology, and above-mentioned valve is installed in the glass pipe; The removable coupling head of glass that design has ultra high vacuum performance is to replace traditional oiling glass ground joint joint; Design liquid nitrogen cold hydrazine device makes its vacuum chamber and adsorbate sampling device have the high vacuum performance, to guarantee to measure the under low pressure absorption and the isothermal accuracy of desorb of organic vapor.
Be elaborated below in conjunction with accompanying drawing
Fig. 1 is the synoptic diagram of Weight method static adsorption instrument
Fig. 2 is the synoptic diagram of air extractor
Fig. 3 is the synoptic diagram of vacuum chamber
Fig. 4 is the synoptic diagram of adsorbate sample adding device
Fig. 5 is the synoptic diagram of adsorbance measurement mechanism
But Fig. 6 is steel flange and alloy valve pipe welding figure
Fig. 7 is removable coupling head
Fig. 8 does not have the fat valve for glass
Weight method static adsorption instrument is made up of air extractor, adsorbate sample adding device, vacuum chamber, device for pressure measurement, adsorbance measurement mechanism, temperature control equipment.As shown in Figure 1 and Figure 2, described air extractor includes oil-sealed rotary pump 1, surge flask 4, jetting pump 7, diffusion pump 8, except that oil-sealed rotary pump and surge flask by the rubber tube UNICOM, all the other all pass through glass pipe UNICOM successively.As Fig. 1, shown in Figure 3, the adsorption tube 20 that described vacuum chamber includes distribution plate 28, is unified into by removable coupling head 23 butt joints, described distribution plate 28 and described adsorption tube 20 be by glass tube UNICOM, described vacuum chamber and by glass pipe and air extractor UNICOM.As Fig. 1, shown in Figure 4, described adsorbate sample adding device includes adsorbate dress sample bottle 32, the removable coupling head 31 of application of sample import, one glass flange sealing-in of described adsorbate dress sample bottle 32 and the removable coupling head 31 of described application of sample import, and application of sample import high vacuum valve 30, micrometering valve 29 are equipped with in another glass flange of the removable coupling head 31 of described application of sample import and the glass pipe sealing-in of UNICOM's vacuum chamber on the glass pipe between described adsorbate sample adding device and the described vacuum chamber.As Fig. 1, shown in Figure 3, on the glass pipe between described vacuum chamber and the described air extractor, the high vacuum valve 12 of bleeding is housed.Above-mentioned application of sample import high vacuum valve 30, the high vacuum valve 12 of bleeding, micrometering valve 29 all are metal-fluororubber valve, but be to adopt argon arc welding and 34 welding of alloy valve pipe by steel flange shown in Figure 6 33, but again with the glass tube segmentation matched seal approaching with alloy valve pipe 34 thermal expansivity, last sealing-in is on glass pipe separately.The removable coupling head 23 of the removable coupling head 31 of described application of sample import, described adsorption tube; as shown in Figure 7; all be to adopt a pair of centre to accompany butt joint glass flange 36 structures of O shape fluorine rubber ring 35, the described butt joint glass flange 36 outer fixed covers 37 that protection is housed, in locating ring 38 is housed.
Owing to adopt application of sample import vacuum valve, metal-glass sealing technology, design has the removable coupling head of glass on the adsorption tube of ultra high vacuum performance, can make evacuated chamber be evacuated to＜10
-4Handkerchief (equals 7.5 * 10
-7Mm Hg) cut off the back with air extractor in 2 hours, can keep＜10
2Handkerchief.
Owing to adopt application of sample import high vacuum valve, ultrahigh vacuum micrometering valve, metal-glass sealing technology, the removable coupling head of application of sample import that design has ultra high vacuum performance, can make the adsorbate sampling device have the high vacuum performance, guaranteeing the purity of adsorbate steam, and can carry out the sample introduction of (0.1-10Pa) adsorbate gas under the low pressure easily and effectively.
As shown in Figure 1 and Figure 2, at described air extractor with bleed liquid nitrogen cold hydrazine device 9 is housed between the high vacuum valve 12.Liquid nitrogen cold hydrazine device is that the airtight chuck of glass is installed in the airtight case of glass, and liquid nitrogen is housed in chuck, and chuck communicates with air extractor and vacuum chamber by glass pipe respectively outward.Owing to design liquid nitrogen cold hydrazine device, and be main pump, can make air extractor obtain＜10 with big level Four ODP
-4The low pressure of Pa, and do not have the back migration of pump oil vapour molecule to vacuum chamber.
As shown in Figure 1 and Figure 2, between above-mentioned surge flask 4 and the above-mentioned jetting pump 7 by main low vacuum valve 6, secondary low vacuum valve 5 is told a looped pipeline road.Described secondary low vacuum valve 5 and secondary liquid nitrogen cold hydrazine device 18, the pair high vacuum valve 16 of bleeding constitutes looped pipeline road and above-mentioned vacuum chamber UNICOMs, and on above-mentioned pair is bled glass pipe between high vacuum valve 16 and the secondary liquid nitrogen cold hydrazine device 18 low vacuum air release 17 is housed.Described main low vacuum valve 6 and above-mentioned jetting pump 7 UNICOMs.The described pair high vacuum valve 16 of bleeding is identical with above-mentioned high vacuum valve 12 structures of bleeding, and installation method is identical.Vacuum chamber passes through main line by the looped pipeline road earlier, again with the performance of protection air extractor when vacuumizing.
As shown in Figure 8, main low vacuum valve, secondary low vacuum valve, low vacuum air release all do not have the fat valve for glass.The aperture of control diaphragm of rubber 39 is with the switch of by-pass valve control.The glass that the present invention adopts does not have the fat valve and is approved product.
Application of sample import high vacuum valve, micrometering valve, the high vacuum valve of bleeding, the pair that the present invention the adopts high vacuum valve of bleeding is approved product, but will be installed in the glass pipe of this absorption instrument the technical scheme that will adopt the present invention to propose: the metal-glass sealing technology.As shown in Figure 6, but adopt steel flange 33 and valve pipe 34 to carry out argon arc welding, but and then carry out matched seal with valve pipe and DM-308 glass tube 55, its step is as follows: (1) but valve pipe and DM-308 glass tube clean up; (2) but valve pipe annealing in hydrogen atmosphere handle, but purpose is to remove impurity, gas, particularly oxygen in the valve material and the chemical combination material of carbon one class, in case when sealing by fusing, produce a large amount of bubbles; (3) but the oxidation processes of valve pipe, but between valve material and glass, to form an oxide layer, make bonding solid; (4) but valve pipe and DM-308 glass tube sealing by fusing, both thermal expansivity are very approaching, but the linear expansion coefficient of 4J2P valve material and DM-308 glass is 49 * 10
-7/ ℃ about; (5) carry out annealing in process, to eliminate stress.After but valve pipe and DM-308 glass tube carry out sealing-in, carry out sealing-in with DM-308 glass tube 55 and DZ-606 glass tube 56 again, use DZ-606 glass tube 56 and 57 sealing-ins of 95 glass tubes at last, 95 glass tubes also are used glass pipe in the absorption instrument, and the thermal expansivity of DZ-606,95 glass is respectively 43.3 * 10
-7/ ℃ and 39 * 10
-7/ ℃ about, during two kinds of different glass head seals of forming, its thermal expansivity is advisable to be no more than 10%, otherwise the sealing by fusing place easily produces bigger internal stress and bursts.Metal valve adopts the metal-glass sealing technology to be installed in the glass pipe by steel flange like this.Screw rod 70 on the steel flange is to be fixed on the test stand when mounted, fixedlys connected with test stand by screw rod, can make test stand bear the weight of valve.
Design has the removable coupling head of nothing oil glass of ultra high vacuum performance among the present invention, as shown in Figure 7, a pair of butt joint glass flange 36, the interface surface polishing, the centre accompanies O shape fluorine rubber ring 35 sealing, interior dress locating ring 38 location, and fixed cover 37 is made of upper and lower sleeve, and connect by the spiral shell button fastening, upper and lower sleeve respectively by metal washer 40, rubber washer 41 these two-layer packing rings respectively with the outer edge sealed attachment of two ring flanges.Because the polishing of the interface surface of flange has O shape fluorine rubber ring, metal washer, rubber ring seal again, the spiral shell fastening by upper and lower sleeve connects firmly and connects again, makes removable coupling head can have ultra high vacuum performance.Screw rod 44 on the fixed cover is to be fixed on the test stand when mounted, fixedlys connected with test stand by screw rod, can make test stand bear the weight of valve.
In Fig. 1, Fig. 2, by rubber tube one electromagnetic release valve 2 synchronous with oil-sealed rotary pump 1 is housed at oil-sealed rotary pump 1 inlet, to prevent after the sudden power that atmosphere recoils in air extractor by oil-sealed rotary pump 1 and mechanical pump oil flows backwards in air extractor.In Fig. 2, heat actuating medium-275 silicone oil of diffusion pumps 8, jetting pump 7 by two electric furnaces 41.The chilled water of the water leg of diffusion pump 8, jetting pump 7 is provided by centrifugal water pump 42 and poultry pond 43.
As Fig. 1, Fig. 2, shown in Figure 3, device for pressure measurement includes capacitance-type pressure gage and is installed in pressure transducer 13,14,15 in the vacuum chamber, be installed in the thermocouples gauge tube 3,10 in the air extractor, ionization gauge 11, and be installed in ionization gauge 27 in the vacuum chamber.Adopt the high-precision capacitance-type pressure gauge, can be accurately, reliably, easily quantitative 10
-1To 10
5The pressure of each adsorbate gas of Pa.
As Fig. 1, shown in Figure 5, the adsorbance measurement mechanism includes quartz spring 24, adsorbent dress sample dish 21, CCD noncontact side gearshift 45, and identifies 22. and can measure quartz spring elongation corresponding to adsorbance accurately, reliably, easily by CCD noncontact location moving device.Also can adopt the quartz spring elongation of altimeter measurement corresponding to adsorbance.
Temperature control equipment adopts constant temperature machine to the laboratory whole constant temperature, and the residing temperature of sample of sorbent is controlled in the scope of set-point ± 0.2 ℃.In Fig. 1, there is contact thermometer 25,26 on distribution plate 28 sides, and there is microthermometer 19 on the adsorption tube side.
The principle of work of Weight method static adsorption instrument is: under stationary temperature, to originally slowly put into the vacuum chamber of originally being pumped into high vacuum through micrometering valve 29 through the organic steam (adsorbate gas) of fully purifying, adsorb on the adsorbent of handling through high temperature, high vacuum degassing (as activated charcoal) in adsorbate gas and the adsorbent dress sample dish 21 that places vacuum chamber, progressively increase the pressure of adsorbate gas, just obtain one group under the constant temperature steam pressure and the data-adsorption isothermal of adsorbents adsorb amount.After recording adsorption isothermal, progressively take out the adsorbate in the vacuum chamber, can obtain desorption isotherm through the pair high vacuum valve 16 (or the high vacuum valve 12 of bleeding) of bleeding.
Experimental temperature can be read from microthermometer 19, and the adsorbate gaseous tension can be read from MKS high-precision capacitance-type pressure gauge, and the adsorbance of adsorbent is tried to achieve by the elongation of the quartz spring that altimeter or CCD noncontact location moving device record.
Weight method static adsorption instrument of the present invention can measure 0.1 to 10 accurately, reliably, easily
5Absorption and the desorption isotherms of adsorbate in micro-porous adsorption agent such as activated charcoal such as Pa organic steam.
Claims (4)
1; a kind of Weight method static adsorption instrument; be by air extractor; the adsorbate sample adding device; vacuum chamber; device for pressure measurement; the adsorbance measurement mechanism; temperature control equipment is formed; described air extractor comprises oil-sealed rotary pump; surge flask; jetting pump; diffusion pump; except that oil-sealed rotary pump and surge flask by the rubber tube UNICOM; all the other all pass through glass pipe UNICOM successively; described vacuum chamber comprises distribution plate and the adsorption tube that is unified into by removable coupling head butt joint; described distribution plate and described adsorption tube are by glass tube UNICOM; described vacuum chamber and by glass pipe and air extractor UNICOM; described adsorbate sample adding device includes adsorbate dress sample bottle; the removable coupling head of application of sample import; one glass flange sealing-in of described adsorbate dress sample bottle and the removable coupling head of described application of sample import; and another glass flange of the removable coupling head of described application of sample import and the glass pipe sealing-in of UNICOM's vacuum chamber; it is characterized in that on the glass pipe between described adsorbate sample adding device and the described vacuum chamber, being equipped with application of sample import high vacuum valve; micrometering valve; on the glass pipe between described vacuum chamber and the described air extractor, the high vacuum valve of bleeding is housed; above-mentioned application of sample import high vacuum valve; the high vacuum valve of bleeding; micrometering valve all is metal-fluororubber valve; but be to adopt argon arc welding and the welding of alloy valve pipe by steel flange; but again with the glass tube segmentation matched seal approaching with alloy valve pipe thermal expansivity; last sealing-in is on glass pipe separately; the removable coupling head of described application of sample import; the removable coupling head of described adsorption tube all is to adopt a pair of centre to accompany the butt joint glass flange arrangement of O shape fluorine rubber ring; described butt joint glass flange is equipped with the fixed cover of protection outward, in locating ring is housed.
2, Weight method static adsorption instrument according to claim 1, it is characterized in that at described air extractor and bleed liquid nitrogen cold hydrazine device is housed between the high vacuum valve, this liquid nitrogen cold hydrazine device is that the airtight chuck of glass is installed in the airtight case of glass, in this chuck liquid nitrogen is housed, this chuck communicates with described air extractor and described vacuum chamber by glass pipe respectively outward.
3, Weight method static adsorption instrument according to claim 2, it is characterized in that between described surge flask and above-mentioned jetting pump by main low vacuum valve, secondary low vacuum valve is told a looped pipeline road, described secondary low vacuum valve and secondary liquid nitrogen cold hydrazine device, the pair high vacuum valve of bleeding constitutes looped pipeline road and above-mentioned vacuum chamber UNICOM, and on above-mentioned pair is bled glass pipe between high vacuum valve and the secondary liquid nitrogen cold hydrazine device, the low vacuum air release is housed, described main low vacuum valve and above-mentioned jetting pump UNICOM, the described pair high vacuum valve of bleeding is identical with the above-mentioned high vacuum valve structure of bleeding, and installation method is identical.
4, Weight method static adsorption instrument according to claim 3 is characterized in that all not having the fat valve for glass at described main low vacuum valve, secondary low vacuum valve, low vacuum air release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105554 CN1055997C (en) | 1993-05-14 | 1993-05-14 | Gravimetric static adsorption instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93105554 CN1055997C (en) | 1993-05-14 | 1993-05-14 | Gravimetric static adsorption instrument |
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| Publication Number | Publication Date |
|---|---|
| CN1081510A CN1081510A (en) | 1994-02-02 |
| CN1055997C true CN1055997C (en) | 2000-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93105554 Expired - Fee Related CN1055997C (en) | 1993-05-14 | 1993-05-14 | Gravimetric static adsorption instrument |
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| Country | Link |
|---|---|
| CN (1) | CN1055997C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749261A (en) * | 2011-04-20 | 2012-10-24 | 中国石油化工股份有限公司 | Method for determining molecular sieve and adsorbate affinity AT value |
| CN102749350A (en) * | 2011-04-20 | 2012-10-24 | 中国石油化工股份有限公司 | Method for determining desorption heat effect of organic adsorbate on molecular sieve |
| CN102262030B (en) * | 2011-06-13 | 2013-06-05 | 中国矿业大学(北京) | Experimental system for gas absorption of deep soft rock in hot and humid environment |
| CN102288510B (en) * | 2011-07-20 | 2012-11-14 | 浙江大学 | Hygroscopic weight increment measuring device for low-temperature and heat-insulating foam plastic |
| CN103868820B (en) * | 2014-04-01 | 2016-04-13 | 贝士德仪器科技(北京)有限公司 | Gravimetric method physical adsorption appearance |
| CN110095374B (en) * | 2019-04-08 | 2022-03-08 | 三峡大学 | Apparatus and method for measuring soil-water characteristic curve using salt solution method |
| CN110231273A (en) * | 2019-07-11 | 2019-09-13 | 贝士德仪器科技(北京)有限公司 | A kind of physical adsorption appearance with concentrated type Multi-example tube sealing device |
| CN115493989B (en) * | 2022-11-15 | 2023-07-25 | 北京精微高博仪器有限公司 | Control method for multi-channel vacuuming of static physical adsorption instrument, adsorption instrument |
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1993
- 1993-05-14 CN CN 93105554 patent/CN1055997C/en not_active Expired - Fee Related
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|---|---|
| CN1081510A (en) | 1994-02-02 |
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