CN105203440B - A kind of method that carbon molecular sieve PSA Gas separating property is determined based on imbibition purging principle - Google Patents
A kind of method that carbon molecular sieve PSA Gas separating property is determined based on imbibition purging principle Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000002808 molecular sieve Substances 0.000 title claims abstract description 68
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000010926 purge Methods 0.000 title claims abstract description 58
- 238000005213 imbibition Methods 0.000 title claims abstract description 42
- 238000001179 sorption measurement Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000000523 sample Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 72
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009792 diffusion process Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000004886 process control Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000003556 assay Methods 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000000329 molecular dynamics simulation Methods 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 8
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000009790 rate-determining step (RDS) Methods 0.000 description 7
- 238000003795 desorption Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004540 process dynamic Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001612 separation test Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The present invention discloses a kind of method that utilization imbibition purging principle evaluates carbon molecular sieve PSA Gas separating property.The carbon molecular sieve of saturation adsorbed gas probe is immersed in liquid probe, imbibition purging experiment is carried out under constant volume, imbibition purging kinetic curve and balance purging amount is obtained.Its kinetics mechanism and gas selectivity factor K are determined by kinetics model of biosorption simulation, for judging carbon molecular sieve micropore port size relative size rule, distributing homogeneity and Micropore volume relative size, and then set up a kind of method for evaluating carbon molecular sieve PSA Gas separating property.The method of the present invention can accurately judge that micropore port size and pore volume meet the carbon molecular sieve of gas separation requirement from adsorption mechanism and the angle of pore structure, can either ensure high selectivity, higher adsorption capacity is ensure that again.
Description
Technical field
The present invention relates to a kind of based on the new of imbibition purging principle measure carbon molecular sieve PSA Gas separating property
Method, belongs to gas separation technique field.
Background technology
Carbon molecular sieve (Carbon Molecular Sieve, CMS) is one of common nonpolar carbonaceous material, belongs to double
Peak pore-size distribution material, main ultramicropore (＜ 0.7nm) structure narrow including pore-size distribution and macroporous structure.Ultramicropore aperture
In molecular dimension, sieving actoion is played to different sized molecules, is adapted to kinetic selectivity separation admixture of gas, it is industrial conventional
In air separation by PSA nitrogen, making oxygen by air separation, reclaim CO2, reclaim and refined hydrogen, purification coal bed gas (CH4、N2Deng gaseous mixture
Body) in CH4Etc. technique.Therefore evaluate ultramicropore pore property and absorption property is particularly important.
Because ultramicropore is in molecular dimension, there is diffusion problem and be difficult to reach adsorption equilibrium in fluid under cryogenic, because
This can not be characterized using cryogenic gas absorption method to its hole structural property；And supercritical state is in the gas of normal temperature state more
State, studies also immature to its adsorption theory at present.Therefore, sign currently for ultramicropore pore structure and absorption property are ground
It is still a hang-up to study carefully.
One of carbon molecular sieve PSA Gas separating property evaluation method is selectivity factor.United States Patent (USP) 4933314A
By determining O2、N2Adsorbance on carbon molecular sieve during 1min, and then calculating obtains O respectively2/N2Selectivity factor α.This is special
Profit thinks O when α gets over Datong District2Adsorbance is bigger, represents air separation better.But this method can not reflect charcoal molecule exactly
Sieve real gas separating property；Carbon molecular sieve internal pore structure can not be characterized simultaneously.Industrial widely used pressure-variable adsorption gas
Body separation test result carries out carbon molecular sieve gas separating property evaluation.Such as in nitrogen production by air separation experiment, constant aerogenesis outlet stream
Rate, by investigating aerogenesis N2Highest O in concentration, pressurising time, desorption gas2Concentration and desorption tolerance evaluate air separation；Or
Constant aerogenesis N2Concentration, by investigating highest O in aerogenesis nitrogen recovery, desorption gas2Concentration and desorption tolerance evaluate air separation
Etc..But, this method does not form a unified evaluation criterion, different pressure-swing absorption apparatus, different experiments industrially
The same adsorbent gas separating property of condition evaluating does not have comparativity；Simultaneously in same apparatus different adsorbents need it is optimal
Experiment condition is different.
The content of the invention
For above technical deficiency, the purpose of the present invention is to judge carbon molecular sieve ultramicropore aperture by imbibition purging principle
Size relative size rule, distributing homogeneity and Micropore volume relative size, and then set up a kind of measure carbon molecular sieve transformation
The method of adsorbed gas separating property, the preparation for instructing carbon molecular sieve.
The technical solution adopted in the present invention is：
A kind of method that carbon molecular sieve PSA Gas separating property is determined based on imbibition purging principle, step is as follows：
This method uses imbibition purging device disclosed in Chinese patent 2008100125980 to carry out carbon molecular sieve imbibition purging
Determine.Bicomponent gas mixt (such as O for needing kinetic selectivity to separate is respectively adopted2/N2、CO2/CH4、CH4/N2Deng) in
Corresponding two kinds of pure gas are expressed as gas A, B as gas probe, and wherein A molecular dimensions are less than B molecular dimensions；Using point
Subdynamics diameter is less than the polar liquid that not readily dissolves of gas molecule and gas molecule as liquid probe.Such as determine carbon molecules
The liquid probe that sieve air separation by PSA nitrogen performance is used is deionized water, and gas probe is O respectively2And N2.It will pass through first
Broken, screening, dry, the pretreated carbon molecular sieve that deaerates are placed in the sample cell of imbibition purging device, in normal pressure, constant temperature
The continuous gas probe that is passed through carries out saturation absorption under the conditions of 303.2K；Injection liquid probe is totally submerged carbon molecular sieve afterwards,
Imbibition purging test, measurement imbibition purging kinetic curve and balance purging amount (ml/g) are carried out under constant volume.
Imbibition purging process is the gas that a liquid is adsorbed in the spontaneous diffusion of sample interior of equilibrium adsorption gas
The process gone out by displacement, belong to gas liquid solid three-phase adsorption process, mainly include three below step：(1) external diffusion process：Liquid
The hole external diffusion process of body molecule and gas molecule；(2) interior diffusion process：Expand in the aperture and hole of fluid molecule and gas molecule
The process of dissipating；(3) suction/desorption process：Gas molecule is desorbed from the carbon molecular sieve surface of solids, and fluid molecule is in carbon molecular sieve solid table
Adsorb in face.Total imbibition purging speed is by most slow process control, i.e. rate determining step.Wherein, external diffusion influences
Through by continuous magnetic agitation liquid probe and then increasing its mass flowrate and eliminating；Macropore mainly plays passage, and its is right
The diffusional resistance of gas molecule can be ignored；Fluid molecule size be less than gas molecule size, therefore fluid molecule be subject to it is micro-
Hole aperture and pore diffusion resistance are less than the resistance suffered by gas molecule；And carbon molecular sieve belongs to nonpolar carbonaceous material,
Gas molecule adsorption process is significantly faster than fluid molecule adsorption process.In summary, carbon molecular sieve imbibition purging mistake
Journey belongs to three draught control processes, main liquid body molecular surface absorption resistance, gas molecule micropore aperture diffusional resistance or hole
Inside diffusional resistance control, it is corresponding follow respectively pseudo-second order kinetic absorption (PSO) model, linear pushing power (LDF) model and
Fick diffusion model.By studying a series of carbon molecular sieve imbibition purging dynamics, find micropore inside diffusional resistance and
Other resistances compare very little, are only just played a role when the very little of micropore aperture；With the reduction of port size, gas
The aperture diffusional resistance that molecule is subject to gradually increases, and its fast control effect gradually strengthens.
Balance purging amount Ve and be equal to gas saturated extent of adsorption.Because how in a supercritical state gas is under normal temperature condition, only
Effective filling, therefore balance purging amount V can be carried out to ultramicroporeeIt can be used for judgement and compare ultramicropore pore volume relative size.
Based on principles above, (PSO) model, linear pushing power (LDF) model and Fick are adsorbed by pseudo-second order kinetic
Diffusion model is fitted to imbibition purging kinetic curve, by respective fitting correlation coefficient R2Being determined with kinetic parameter should
Rate determining step, the calculating carbon molecular sieve gas-selectively COEFFICIENT K of carbon molecular sieve imbibition purging process, for qualitative, quantitative
Carbon molecular sieve micropore port size and distributing homogeneity are analyzed in ground, and then determine carbon molecular sieve PSA Gas separating property；K
There is following form：
Wherein, R2 (gas A, PSO)Represent the linear fitting correlation coefficient of PSO models of imbibition purging body A processes；R2 (gas B, LDF)Generation
The linear fitting correlation coefficient of LDF models of table imbibition purging body B processes.Micropore port size is smaller, the diffusion to gas molecule
Resistance is bigger, i.e., kinetic curve more meets LDF models, deviates PSO models.Therefore, K values can truly reflect that carbon molecular sieve is micro-
Hole port size relative size, i.e., with the reduction of micropore port size, K values reduce therewith.
Specifically assay method is：
(1) carbon molecular sieve micropore port size distributing homogeneity is first determined whether：When whole process is mainly by single resistance control
When processed, then port size distribution is homogeneous；Otherwise, be not suitable for gas separating technology, do not give the judgement of port size relative size.
(2) carbon molecular sieve micropore port size relative size judges：
1) as K ≈ 0, i.e., carbon molecular sieve imbibition purging body A processes meet the i.e. main liquid body Molecular Adsorption process of PSO models
Control, imbibition purging body B processes meet LDF models and mainly controlled by aperture diffusion process, illustrate its micropore aperture to gas B
Diffusional resistance to be far longer than that gas A, A/B selectivity are high, micropore port size is moderate, it is adaptable to PSA Gas A/B
Separating technology.
2) K is worked as>0, and the main liquid body molecular surface adsorption process control of carbon molecular sieve imbibition purging body A, B process,
Illustrate that the average port size of its micropore is bigger than normal, A/B poor selectivities are not suitable for gas A/B separating technologies；K values are smaller, separating property
Better.
3) as K ＜ 0, and carbon molecular sieve imbibition purging body A processes are mainly controlled by micropore aperture diffusional resistance, illustrate that its is micro-
The average port size in hole is less than normal, and A molecules are difficult to fully diffuse in micropore and be directly entered product in effective adsorption time
Cause production B concentration reductions in gas, be not suitable for gas A/B separating technologies；K values are bigger, and separating property is better.
(3) Micropore volume judges, i.e. balance purging amount is bigger, and Micropore volume is bigger, more suitable for PSA Gas point
Separating process.
The beneficial effects of the invention are as follows：
(1) present invention can be used for the ultramicropore hole structural property of qualitative evaluation porous material, make up cryogenic gas absorption
Method can not measure the deficiency of ultramicropore pore structure parameter due to diffusion limitation.
(2) angle from adsorption dynamics adsorption kinetics and micropore structure is qualitative, quantitatively evaluate carbon molecular sieve pressure-variable adsorption gas
Body mixture separating property.
(3) it can be used for the optimum preparating condition for selecting carbon molecular sieve, instruct the charcoal molecule separated for admixture of gas
The preparation of sieve.
Brief description of the drawings
N is driven in Fig. 1 carbon molecular sieves CMS-1~CMS-6 water suctions2Kinetic curve.
O is driven in Fig. 2 carbon molecular sieves CMS-1~CMS-6 water suctions2Kinetic curve.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is further described for table and embodiment.
Embodiment 1
In the present embodiment, constant volume suction is utilized under the conditions of 30 DEG C with carbon molecular sieve (CMS-1~CMS-6) using 6 kinds of space divisions
Liquid purging device carries out water suction and drives O respectively2/N2Experiment, measures imbibition purging kinetic curve and balance purging volume Ve(ml/
G), as shown in Figure 1, 2.(PSO) model is adsorbed by pseudo-second order kinetic and linear pushing power (LDF) model carries out line style mould
Intend, the respective linearly dependent coefficient R of com-parison and analysis2With kinetic parameter (shown in table 1,2), it is determined that water suction purging process dynamics
Rate-determining step, calculates selectivity factor K values, as shown in table 3.
O is driven by 6 kinds of carbon molecular sieve water suctions in analytical table 32/N2Process rate-determining step and K values, its air separation by PSA nitrogen
Performance is summarized as follows：
(1) judgement of micropore port size distributing homogeneity：Only CMS-5 micropores port size skewness, is discontented with
The requirement of sufficient air separation by PSA nitrogen producing craft.
(2) carbon molecular sieve micropore port size relative size is analyzed, its air separation by PSA nitrogen performance is evaluated.K values are big
Small rule：CMS-1>CMS-2>CMS-3>0>CMS-4>CMS-5>CMS-6, correspondence space division effect (production nitrogen concentration) rule：CMS-1
<CMS-2<CMS-3≈CMS-4>CMS-5>CMS-6.CMS-3 and CMS-4 micropore port size relative sizes are moderate, are adapted to transformation
Adsorb nitrogen production by air separation technique.
(3) as shown in Table 4, CMS-3 balance purging amount is maximum 4.4667ml/g, determines CMS-3 Micropore volumes most
Greatly.Therefore finally conclude：CMS-3 is because its port size is moderate, distribution is homogeneous and Micropore volume is maximum, most suitable as absorption
Agent is used for air separation by PSA nitrogen producing craft.
In order to verify the correctness of the invention, space division is carried out to above-mentioned 6 kinds of carbon molecular sieves using double column pressure swing absorbing unit
Nitrogen experiment processed.Selected experiment condition is：Inlet flow rate 950ml/min, constant aerogenesis outlet flow rate is 1.054ml/min/g；
30 DEG C of adsorption temp, adsorptive pressure 0.5MPa, desorption pressure 0.1MPa；Adsorption time 64s, emptying time 2s, press time 1s.
Experimental result is as shown in table 5.Compare aerogenesis N2Concentration rule is：CMS-1<CMS-2<CMS-3≈CMS-4>CMS-5>
CMS-6, illustrates that air separation rule is：CMS-1<CMS-2<CMS-3≈CMS-4>CMS-5>CMS-6, wherein CMS-3 are optimal
Adsorbent.Conclusions and the result that the present embodiment is obtained are completely the same, demonstrate measure carbon molecular sieve disclosed by the invention and become
Press the correctness and practicality of adsorbed gas separating property method.
Embodiment 2
In the present embodiment, constant volume imbibition purging is utilized under the conditions of 30 DEG C using 4 kinds of carbon molecular sieves (CMS-1~CMS-4)
Device carries out water suction and drives N respectively2/CH4Experiment, measures imbibition purging kinetic curve and balance purging volume Ve(ml/g), as schemed
1st, shown in 2.(PSO) model is adsorbed by pseudo-second order kinetic and linear pushing power (LDF) model carries out line style simulation, it is determined that inhaling
Water drive gas process kineticses rate-determining step, calculates selectivity factor K values, as shown in table 6.K value size rules：CMS-1>CMS-2>0>
CMS-3>CMS-4, correspondence gas separation effect rule：CMS-1<CMS-2>CMS-3>CMS-4.CMS-2 K values closest to 0,
Therefore it is best suitable for pressure-variable adsorption separation N2/CH4Technique.
Carbon molecular sieve CMS-1~CMS-6 water suctions are driven under table 1PSO models and LDF modelings 303.2K
O2The kinetic parameter and linearly dependent coefficient of process
N is driven in carbon molecular sieve CMS-1~CMS-6 water suctions under table 2PSO models and LDF modelings 303.2K2The power of process
Learn parameter and linearly dependent coefficient
O is driven in the carbon molecular sieve CMS-1 of table 3~CMS-6 water suctions2/N2Process rate rate-determining steps and selectivity factor K are summarized
| Sample | CMS-1 | CMS-2 | CMS-3 | CMS-4 | CMS-5 | CMS-6 |
| O is driven in water suction2Process | S | S | S | S | S+M | M |
| N is driven in water suction2Process | S | S | M | M | S+M | M |
| K (%) | 5.304 | 2.445 | 0.097 | -0.016 | -1.076 | -2.792 |
Symbol S represents hydrone adsorption process control；M represents aperture diffusional resistance control
O is driven in the carbon molecular sieve CMS-1 of table 4~CMS-6 water suctions2Process balances purging amount Ve
| Sample | CMS-1 | CMS-2 | CMS-3 | CMS-4 | CMS-5 | CMS-6 |
| Ve(ml/g) | 2.5140 | 2.5052 | 4.4667 | 3.1131 | 3.4951 | 2.9801 |
The carbon molecular sieve CMS-1 of table 5~CMS-6 double column pressure swings absorption space division test data
N is driven in the carbon molecular sieve CMS-1 of table 6~CMS-4 water suctions2/CH4Process rate rate-determining steps and selectivity factor K are summarized
| Sample | CMS-1 | CMS-2 | CMS-3 | CMS-4 |
| N is driven in water suction2Process | S | S | M | M |
| CH is driven in water suction4Process | S | M | M | M |
| K (%) | 2.867 | 0.005 | -1.744 | -4.634 |
Claims (2)
1. a kind of method that carbon molecular sieve PSA Gas separating property is determined based on imbibition purging principle, it is characterised in that
Step is as follows：
This method uses imbibition purging device disclosed in ZL200810012598.0 to carry out carbon molecular sieve imbibition purging and determined；
Be respectively adopted kinetic selectivity separation bicomponent gas mixt in corresponding two kinds of pure gas as gas probe,
Gas A and gas B are expressed as, wherein gas A molecular dimensions are less than gas B molecular dimensions；It is less than using molecular dynamics diameter
Gas molecule and gas molecule is difficult to the polar liquid dissolved as liquid probe；First will be by broken, screening, dry, de-
The pretreated carbon molecular sieve of gas is placed in the sample cell of imbibition purging device, is continuously led under the conditions of normal pressure, constant temperature 303.2K
Enter gas probe and carry out saturation absorption；Injection liquid probe is totally submerged carbon molecular sieve afterwards, and imbibition is carried out under constant volume
Purging is tested, measurement imbibition purging kinetic curve and balance purging amount Ve；Balance purging amount VeEqual to gas saturated extent of adsorption,
Gas is in a supercritical state under normal temperature condition, and effective filling, balance purging amount V are carried out to ultramicroporeeFor comparing ultra micro
Hole pore volume relative size；
According to pseudo-second order kinetic Adsorption Model, linear pushing power model and Fick diffusion model to imbibition purging kinetic curve
It is fitted, by respective fitting correlation coefficient R2The speed control of the carbon molecular sieve imbibition purging process is determined with kinetic parameter
Step processed, calculating carbon molecular sieve selectivity factor K, for qualitative, quantitatively analysis carbon molecular sieve micropore port size and distribution
Uniformity, and then determine carbon molecular sieve PSA Gas separating property；K has following form：
Wherein, R2 (gas A, PSO)Represent the linear fitting correlation coefficient of PSO models of imbibition purging body A processes；R2 (gas B, LDF)Represent and inhale
The linear fitting correlation coefficient of LDF models of liquid purging body B processes；Micropore port size is smaller, to the diffusional resistance of gas molecule
Bigger, i.e., kinetic curve more meets LDF models, deviates PSO models；K values truly reflect carbon molecular sieve micropore port size phase
To size, i.e., with the reduction of micropore port size, K values reduce therewith；
Specifically assay method is：
(1) carbon molecular sieve micropore port size distributing homogeneity is first determined whether：When whole process mainly by single draught control when,
Then port size distribution is homogeneous；Otherwise, be not suitable for gas separating technology, do not give the judgement of port size relative size；
(2) carbon molecular sieve micropore port size relative size judges：
1) as K ≈ 0, i.e., to meet the i.e. main liquid body Molecular Adsorption of PSO models excessively program control for carbon molecular sieve imbibition purging body A processes
System, imbibition purging body B processes meet LDF models and mainly controlled by aperture diffusion process, illustrate its micropore aperture to gas B's
Diffusional resistance will be far longer than gas A, A/B selectivity height, and micropore port size is moderate, it is adaptable to A/B points of PSA Gas
Separating process；
2) K is worked as>0, and the main liquid body molecular surface adsorption process control of carbon molecular sieve imbibition purging body A, B process, explanation
The average port size of its micropore is bigger than normal, and A/B poor selectivities are not suitable for gas A/B separating technologies；K values are smaller, and separating property is got over
It is good；
3) as K ＜ 0, and carbon molecular sieve imbibition purging body A processes are mainly controlled by micropore aperture diffusional resistance, illustrate that its micropore is put down
Equal port size is less than normal, and A molecules are difficult to fully diffuse in micropore and be directly entered in product gas in effective adsorption time
Cause production B concentration reductions, be not suitable for gas A/B separating technologies；K values are bigger, and separating property is better；
(3) Micropore volume judges, i.e. balance purging amount is bigger, and Micropore volume is bigger, more separates work suitable for PSA Gas
Skill.
2. the side according to claim 1 that carbon molecular sieve PSA Gas separating property is determined based on imbibition purging principle
Method, it is characterised in that determine carbon molecular sieve air separation by PSA nitrogen performance using this method, visited using deionized water as liquid
Pin, respectively with O2And N2It is used as gas probe.
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| CN109696380B (en) * | 2019-03-04 | 2021-04-16 | 大连理工大学 | Method and device for evaluating gas separation performance of microporous material |
| CN112183611A (en) * | 2020-09-23 | 2021-01-05 | 中国农业大学 | Gas sensor signal fusion optimization system and method |
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