CN102274677B - Membrane gas separation device and method - Google Patents
Membrane gas separation device and method Download PDFInfo
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- CN102274677B CN102274677B CN2011100355522A CN201110035552A CN102274677B CN 102274677 B CN102274677 B CN 102274677B CN 2011100355522 A CN2011100355522 A CN 2011100355522A CN 201110035552 A CN201110035552 A CN 201110035552A CN 102274677 B CN102274677 B CN 102274677B
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- 239000012528 membrane Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 21
- 238000000926 separation method Methods 0.000 title abstract description 18
- 230000005686 electrostatic field Effects 0.000 claims abstract description 37
- 239000012466 permeate Substances 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 17
- 230000008595 infiltration Effects 0.000 claims description 18
- 238000001764 infiltration Methods 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 abstract description 10
- 238000010168 coupling process Methods 0.000 abstract description 10
- 238000005859 coupling reaction Methods 0.000 abstract description 10
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract 3
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 89
- 230000005684 electric field Effects 0.000 description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 238000012546 transfer Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000007791 dehumidification Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- -1 dimethylaminoethyl Chemical group 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 238000009297 electrocoagulation Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- 238000013519 translation Methods 0.000 description 1
Abstract
The invention relates to an asymmetric electrostatic field coupling membrane gas separation device which comprises a raw material chamber, a permeating chamber, a membrane and an electrode, wherein the electrode can be used for generating an asymmetric electrostatic field; the electrode comprises a flat electrode and a needle electrode; a 101-104V direct current voltage is applied to the electrode; the raw gas containing polar gas molecules enters into the raw material chamber; under the dual action of chemical potential gradient and electric potential gradient of the asymmetric electrostatic field, the raw gas spreads and permeates through the membrane at a speed higher than the speed under the existence of pure chemical potential gradient, thereby forming the penetrating gas and flowing from the permeating chamber; and the remaining gas flows from the raw material chamber, thereby separating the raw gas. The invention also relates to an asymmetric electrostatic field coupling membrane gas separation method.
Description
Technical field
The present invention relates to the membrane gas separation field, be specifically related to the apparatus and method that a kind of asymmetric Electrostatic Field Coupling membrane gas separates, increase mass transfer force, improve infiltration rate and separating effect.
Background technology
Gas membrane Seperation Technology has started the business application in 20 century 70s.The main feature of this technology is without phase transformation, and energy consumption is low, and unit scale requires changeablely, more flexible according to treating capacity, and equipment is simple, and easy to operate, operational reliability is high.In the process that membrane gas separates, gas is dissolved in film when with film, contact, and, under the promotion of chemical potential gradient, to opposite side, spreads in film, and during to the opposite side of film, gas, from film, desorbing, has been realized the mass transfer of gas from film one side direction opposite side.The character of the speed of air penetrating film and the quality of gas molecule, geometry, polarity etc. and film has relation.Some gas and film have stronger affinity, and more soluble in film (as stream molecule in hydrophilic film), some gas is more difficult being dissolved in film; Be dissolved in the gas in film, some faster speed in film, spread (gas molecule as less as diameter), some is with slower VELOCITY DIFFUSION.Due to the difference on solubility and diffusion rate, some gas molecule can see through film (being called traditionally " fast gas ") quickly, some gas molecule sees through film slow (being called " gas slowly "), " fast gas " will be higher than the ratio in feed side in the ratio that sees through side with " gas slowly ", so in the enrichment that has formed " fast gas " through side, thereby realize that gas separates.
Generally, gas can reach balance quickly at dissolving and the desorption process on film surface, and the diffusion process of gas in film is slower, is the rate determining step of air penetrating film.The mass transfer force spread in film due to gas is only the chemical potential gradient, and gas is lower by the absolute value of the infiltration rate of film, requires in actual applications membrane area quite large, affects applying of membrane gas separation.
Chinese patent CN1379697A, CN1994536A, CN101104537A, CN101596406A, CN101721914A, CN101716465A etc. disclose and have utilized electrostatic field in the film separation process.CN1379697A discloses the surface charge of utilizing electrostatic field to change suspended particulate, reduces biomembranous formation, improves membrane separating property; CN101104537A discloses and under electric field action, has formed the organic matter in strong oxidation source oxidation Decomposition water; CN101721914A discloses and in membrane filtration, has passed through electric field action, makes charged organic matter or the effects such as particle generation electrophoretic migration, electrocoagulation, reduces concentration polarization and film pollution that electrically charged organic matter or particle cause; CN101716465A, CN101596406A disclose under the DC electric field effect, make charged molecule or particulate produce the electrophoresis motion that deviates from or see through face, and the concentration polarization and the film that are suppressed at face pollute; CN1994536A discloses and has utilized electric field action in the separation process of multicomponent polysaccharide membrane, reduces concentration polarization and film and pollutes, and improves separating property.
Retrieve research both domestic and external, also by additional electrostatic force, do not improve the report of the infiltration rate of membrane gas separation as mass transfer force.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, at membrane gas, separate on the basis of original technology, the apparatus and method that provide a kind of asymmetric Electrostatic Field Coupling membrane gas to separate, increased mass transfer force, improves infiltration rate and separating effect.
According to an aspect of the present invention, the device that provides a kind of asymmetric Electrostatic Field Coupling membrane gas to separate.In one embodiment, device comprises feed chamber, permeate chamber, film and electrode, and described electrode can produce asymmetric electrostatic field.
According to device provided by the invention, preferably described asymmetric electrostatic field is produced by plate electrode and needle electrode, and the voltage preferably described electrode applied is 10
1～10
4Volt.
According to device provided by the invention, described plate electrode is positioned at feed chamber one side (can in inside or the outside of feed chamber), can be the stainless steel of graphite, stainless steel, titanium, platinum or plating ruthenium, titanium etc.Needle electrode is positioned at permeate chamber one side (can in inside or the outside of permeate chamber), can have the material same with plate electrode.Enter the polar gas in the unstrpped gas of feed chamber, under the electric potential gradient effect of chemical potential gradient and described asymmetric electrostatic field formation, the speed faster of usining when only depending on the chemical potential gradient as motive force sees through film and flows out from permeate chamber, oozes the residual air body and flows out from feed chamber.
According to device provided by the invention, difference according to divided gas flow, the position of plate electrode and needle electrode can exchange, be that plate electrode is positioned at permeate chamber one side (can in inside or the outside of permeate chamber), needle electrode is positioned at feed chamber one side (can in inside or the outside of feed chamber).
According to device provided by the invention, the membrane gas separation process is to complete under the effect of asymmetric electrostatic field.Gas molecule can be divided into two classes: nonpolar molecule and polar molecule.The symmetrical configuration of nonpolar molecule, without under External Electrical Field, the center of gravity of positive and negative charge overlaps, and dipole moment is zero, as C
2H
6, C
2H
4, CH
4, H
2Deng and all elementary gas.The structure of polar molecule is asymmetric, and without under External Electrical Field, the center of gravity of positive and negative charge does not overlap, and certain distance is arranged between them, has intrinsic dipole moment, as H
2O, H
2S, CO, SO
2Deng.Polar molecule is not when there is no extra electric field, and due to the random warm-up movement of molecule, arrangement is disorderly.Under External Electrical Field, the positive and negative charge center of gravity of nonpolar molecule and polar molecule can be pulled open along direction of an electric field, molecule is deformed and produce an additional dipole, this process is the polarization of molecule, this dipole is induced dipole, and the deformation polarizability of its intensity size and electric-field intensity and molecule is directly proportional.In the available electric field of reality, the induced dipole of nonpolar molecule is apart from less than the dipole moment of polar molecule, a little less than being subjected to electric field force effect relatively.Polar molecule issues to give birth in External Electrical Field and rotates, and trends towards carrying out ordered arrangement along the external electric field direction, and external electric field is stronger, arranges more neat.Under uniform electric field, complete when orientation, namely electric field energy fades to hour, reaches balance, and active force is zero, and dipole can not produce translation.When an additional asymmetric electrostatic field, space electric field everywhere is inhomogeneous, and dipole is to the direction migration of electric-field strength under the effect of electric field force, and this dynamics phenomenon caused by electric potential gradient is called the electromigration mass transfer.Electromigration speed is relevant with electric-field intensity, molecular polarity and molecular mass etc., and nonpolar molecule can think substantially there is no electromigration, still take random warm-up movement as main.When the system that membrane gas is separated is placed in asymmetric electrostatic field, feed chamber one side of film is the weak side of field intensity, and permeate chamber one side is the side that field intensity is stronger.On the one hand, separate identically with traditional membrane gas, gas component is by the permeate chamber one side diffusion mass transfer of the feed chamber one side direction low concentration of high concentration, and motive force is the chemical potential gradient; On the other hand, the effect of electric field force causes the electromigration mass transfer that becomes maximum direction to electric field, and motive force is electric potential gradient.The collaborative processes that this asymmetric electrostatic field is separated with membrane gas is called " asymmetric Electrostatic Field Coupling membrane gas separates ".If polar gas is separated with non-polar gas, and polar gas is while being " fast gas ", and after the asymmetric electrostatic field of affix, the infiltration rate of " fast gas " will faster, thereby will make " gas soon " enrichment faster seeing through chamber one side.Some indivedual system is that polar gas is that " gas slowly " is (as H
2/ CO system), now asymmetric electrostatic field can oppositely apply, be that feed chamber one side is needle electrode, seeing through chamber one side is plate electrode, the active force that asymmetric electrostatic field imposes on polar molecule stops it to see through film, now " gas slowly " see through the flux of film can be less when not applying electric field, thereby more be conducive to improve separation.
According to device provided by the invention, in one embodiment, be vacuum in permeate chamber, the gas that diffuses into permeate chamber is taken away, to maintain infiltration gas concentration lower in permeate chamber.In permeate chamber, the flow direction of infiltration gas can be identical with the flow direction of unstrpped gas, also can be different from the flow direction of unstrpped gas.
According to device provided by the invention, described film is dense film, comprises homogeneous gas diffusion barrier and composite gas diffusion barrier.Needs according to separating the gas with various system, can adopt any suitable known gas separation membrane.
According to device provided by the invention, asymmetric Electrostatic Field Coupling membrane gas separator also can comprise heating or attemperator, make the operating temperature of membrane gas separation process maintain certain scope, the operating temperature range that preferred membrane gas separates is 5～95 ℃.As film, can bear, temperature also can be higher.
According to device provided by the invention, also can comprise the connecting pipe be connected with other devices.
According to a further aspect in the invention, a kind of method that provides asymmetric Electrostatic Field Coupling membrane gas to separate, comprising: unstrpped gas is introduced into feed chamber; The polar gas of introducing in the unstrpped gas of described feed chamber sees through film under the electric potential gradient double action that chemical potential gradient and asymmetric electrostatic field form, usining when only depending on the chemical potential gradient as motive force speed faster in film, enter permeate chamber, ooze residual air body molecule and flow out from feed chamber; The infiltration gas that enters permeate chamber flows out from permeate chamber.
According to method provided by the invention, in one embodiment, asymmetric electrostatic field is produced by plate electrode and needle electrode.The DC voltage preferably applied to described electrode is 10
1～10
4Volt.
According to method provided by the invention, the operating temperature range that described membrane gas separates is 5～95 ℃.As film, can bear, temperature also can be higher.
According to method provided by the invention, described film is dense film, comprises homogeneous gas diffusion barrier and composite gas diffusion barrier.Needs according to separating the gas with various system, can adopt any suitable known gas separation membrane.
According to apparatus and method provided by the invention, comparing traditional embrane method gas separation process only has motive force of chemical potential gradient, two motive forces is arranged, i.e. chemical potential gradient and electric potential gradient in the present invention.Mass transfer rate is the stack of diffusion rate and electromigration speed.The weak molecule of nonpolar molecule or polarity is because the effect that is subjected to electrostatic field is very weak, electrostatic field unmatchful its mass transfer is arranged substantially without affecting; And the mass transfer rate of the strong molecule of polarity after additional asymmetric electrostatic field is fast than without electric field the time, and the raising of mass transfer rate is relevant with the dipole moment in electrostatic field, therefore can improve the speed of gas separation.
According to apparatus and method provided by the invention, can be applicable to any polarity that contains separates with the membrane gas of non-polar gas molecule, also can be used for polarity and differ the membrane gas separation field than the atmospheric molecule, especially can be used for natural gas dehumidification and desulfurization, air dehumidification, organic gas dehumidification, flue gas desulfurization etc.
The invention has the advantages that: broken through traditional membrane gas and separated the pattern that a mass transfer force (being the chemical potential gradient) only arranged, propose by additional another mass transfer force (being electric potential gradient) of asymmetric electrostatic field of coupling thus the separation of viewpoint raising opposed polarity molecule, by the stack of two motive forces, make the further strengthening on the basis of dissolving-diffusive separation of infiltration rate and separating effect.Because modern material is industrial and electrotechniical development reduces the manufacturing cost of static power supply greatly, realize that the equipment manufacturing cost of coupled field is low.By apparatus and method provided by the invention, can improve infiltration rate and separating effect, have applicability and good practicality widely.
The accompanying drawing explanation
Accompanying drawing provides to be convenient to the understanding to present disclosure, and it forms the part of specification but does not form the restriction to any aspect of present disclosure.In the accompanying drawings:
Fig. 1 has shown the membrane gas separator of an example with the form of profile.
The specific embodiment
Embodiment 1
As shown in Figure 1, an exemplary asymmetric Electrostatic Field Coupling membrane gas separator 10, comprise feed chamber 7 and permeate chamber 8, flat sheet membrane 9.In one embodiment, feed chamber 7 comprises import 1 and the outlet 2 of unstrpped gas, and indoor is normal pressure, 25 ℃ of temperature.In feed chamber 7, be provided with plate electrode 4, be negative electrode; In permeate chamber 8, be provided with needle electrode 5, be anode.Between plate electrode 4 and needle electrode 5, add that DC voltage produces asymmetric electrostatic field, the voltage of asymmetric electrostatic field is 2000 volts.In permeate chamber 8, be negative pressure, pressure is 1.7kPa.
In unstrpped gas, comprise saturated steam 6-2 and methane 6-1, air-flow velocity is 0.6L/min, enters feed chamber 7 by import 1, contacts with the face of crosslinked polymethylacrylic acid dimethylaminoethyl/polyacrylonitrile compound slab film 9.Under the effect of the electric potential gradient of asymmetric electric field and chemical potential gradient, the polar gas molecular water steam 6-2 diffusion in unstrpped gas sees through flat sheet membrane 9, desorb on the face permeate chamber 8 in, and steam 6-2 is pumped, from exporting 3 outflows.In this process, the methane that has minute quantity sees through film and enters permeate chamber.The flow direction of gas as shown by the arrows in Figure 1.The infiltration direction of water vapour is as shown in arrow horizontal in Fig. 1.The infiltration rate of steam is 8.12 * 10
-3Cm
3(STP)/(cm
2.s.cmHg), the infiltration rate of methane approximately 1.13 * 10
-6Cm
3(STP)/(cm
2.s.cmHg).
Comparative Examples
The same embodiment of unstrpped gas, feed chamber, permeate chamber, film same embodiment is set, with the embodiment difference be to electrode, not apply DC voltage, the infiltration rate of resulting steam is 4.08 * 10
-3Cm
3(STP)/(cm
2.s.cmHg), the infiltration rate of methane approximately 1.11 * 10
-6Cm
3(STP)/(cm
2.s.cmHg).
Result: above data can learn, by additional asymmetric electrostatic field, the infiltration rate of polar gas molecular water steam increases and is twice, and the infiltration rate of non-polar gas molecule methane does not have change substantially, and methane is separated faster with steam.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment, the present invention is had been described in detail, for those skilled in the art, it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, or part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a membrane separating polarity and non-polar gas or polarity differ the device than atmospheric, comprise feed chamber, permeate chamber, film and electrode, it is characterized in that, described film is dense film, described electrode comprises plate electrode and needle electrode, described electrode can produce asymmetric electrostatic field, and the DC voltage that described electrode is applied is 10
1～10
4Volt.
2. device as claimed in claim 1, is characterized in that, described plate electrode is positioned at described feed chamber one side, and described needle electrode is positioned at described permeate chamber one side.
3. device as claimed in claim 2, it is characterized in that, polar gas molecule in unstrpped gas, under the electric potential gradient effect that chemical potential gradient and described asymmetric electrostatic field form, the speed faster of usining when only depending on the chemical potential gradient as motive force sees through described dense film.
4. device as claimed in claim 1, is characterized in that, the operating temperature of described membrane separating is 5～95 ℃.
5. a membrane separating polarity and non-polar gas or polarity differ the method than atmospheric, comprising: the unstrpped gas that will comprise the polar gas molecule is introduced feed chamber; Described polar gas molecule under the effect of the electric potential gradient that chemical potential gradient and asymmetric electrostatic field form with when only having the chemical potential gradient faster VELOCITY DIFFUSION by dense film, become infiltration gas and flow out from permeate chamber; Oozing the residual air body flows out from described feed chamber.
6. method as claimed in claim 5, is characterized in that, described asymmetric electrostatic field is produced by plate electrode and needle electrode.
7. method as claimed in claim 6, is characterized in that, the DC voltage applied to described plate electrode and needle electrode is 10
1～10
4Volt.
8. method as claimed in claim 5, is characterized in that, the operating temperature of described membrane separating is 5～95 ℃.
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|---|---|---|---|
| CN2011100355522A CN102274677B (en) | 2011-02-10 | 2011-02-10 | Membrane gas separation device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100355522A CN102274677B (en) | 2011-02-10 | 2011-02-10 | Membrane gas separation device and method |
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| Publication Number | Publication Date |
|---|---|
| CN102274677A CN102274677A (en) | 2011-12-14 |
| CN102274677B true CN102274677B (en) | 2013-11-27 |
Family
ID=45100593
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| CN2011100355522A Expired - Fee Related CN102274677B (en) | 2011-02-10 | 2011-02-10 | Membrane gas separation device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022169773A1 (en) * | 2021-02-02 | 2022-08-11 | Sheehan Daniel P | Thermal diffusion membrane, devices, systems and methods |
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|---|---|---|---|---|
| CN103463984B (en) * | 2013-09-10 | 2015-05-13 | 内蒙古天一环境技术有限公司 | Dielectrophoresis hollow fiber membrane assembly |
| CN107837657A (en) * | 2017-11-14 | 2018-03-27 | 清华大学 | A kind of gas fractionation unit |
| CN108815998B (en) * | 2018-05-31 | 2021-02-19 | 武汉大学 | Separation method of electronegative gas electromigration membrane |
| CN110862834A (en) * | 2019-12-10 | 2020-03-06 | 邵帅 | Method for producing clean gas fuel by utilizing printing and dyeing sludge pyrolysis gas |
| CN111229061B (en) * | 2020-01-17 | 2021-11-19 | 西安交通大学 | Porous graphene separation membrane and preparation method thereof |
| CN112798703B (en) * | 2020-12-28 | 2022-01-25 | 南昌大学 | Industrial waste gas detection device with remote control function |
| CN115945041A (en) * | 2022-12-30 | 2023-04-11 | 浙江研一新能源科技有限公司 | Phosphorus pentafluoride purification device and phosphorus pentafluoride preparation method |
| CN115974017A (en) * | 2022-12-30 | 2023-04-18 | 浙江研一新能源科技有限公司 | Preparation method of phosphorus pentafluoride and preparation method of hexafluorophosphate |
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| JPH022819A (en) * | 1988-03-04 | 1990-01-08 | Matsushita Electric Works Ltd | Separation of gas with membrane |
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| WO2022169773A1 (en) * | 2021-02-02 | 2022-08-11 | Sheehan Daniel P | Thermal diffusion membrane, devices, systems and methods |
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