CN112279219A - Method for purifying bottled sulfur hexafluoride gas - Google Patents
Method for purifying bottled sulfur hexafluoride gas Download PDFInfo
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- CN112279219A CN112279219A CN202011177271.6A CN202011177271A CN112279219A CN 112279219 A CN112279219 A CN 112279219A CN 202011177271 A CN202011177271 A CN 202011177271A CN 112279219 A CN112279219 A CN 112279219A
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- Prior art keywords
- gas
- sulfur hexafluoride
- purifying
- bottle
- hexafluoride gas
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 101
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 155
- 239000007788 liquid Substances 0.000 claims abstract description 53
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000012535 impurity Substances 0.000 claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010257 thawing Methods 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims 1
- 238000000746 purification Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004817 gas chromatography Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000000059 Dyspnea Diseases 0.000 description 1
- 206010013975 Dyspnoeas Diseases 0.000 description 1
- 208000007101 Muscle Cramp Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 208000005392 Spasm Diseases 0.000 description 1
- 206010047924 Wheezing Diseases 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000004379 membrane Anatomy 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/45—Compounds containing sulfur and halogen, with or without oxygen
- C01B17/4507—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only
- C01B17/4515—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only containing sulfur and fluorine only
- C01B17/453—Sulfur hexafluoride
Abstract
The invention discloses a method for purifying bottled sulfur hexafluoride gas, belongs to the field of production of sulfur hexafluoride, particularly relates to the field of purification of sulfur hexafluoride, and aims to solve the problem that the purity of the existing bottled sulfur hexafluoride gas cannot meet the requirement of 99.99% in the national standard, and the method comprises the following steps: (1) placing a gas cylinder containing sulfur hexafluoride gas in a liquid containing tank, and pouring liquid nitrogen into the liquid containing tank; (2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder; (3) taking the gas cylinder out of the liquid containing tank, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder by using flowing water; (4) and (3) repeating the steps (1), (2) and (3) for 1-6 times to obtain the purified sulfur hexafluoride gas, wherein the method for purifying the bottled sulfur hexafluoride gas is simple and easy to implement, short in purification time and suitable for purifying the bottled sulfur hexafluoride gas, and the purity of the purified sulfur hexafluoride gas is 99.99-99.999%.
Description
Technical Field
The invention discloses a method for purifying bottled sulfur hexafluoride gas, belongs to the technical field of production of sulfur hexafluoride, and particularly relates to the technical field of purification of sulfur hexafluoride.
Background
Sulfur hexafluoride of the formula SF6Is a colorless, odorless, nontoxic, noncombustible stable gas, has a molecular weight of 146.07, and has a density of 6.1kg/m at 20 deg.C and 0.1MPa3About 5 times the density of air. The sulfur hexafluoride is gaseous at normal temperature and normal pressure, the critical temperature is 45.6 ℃, the triple point temperature is-50.8 ℃, and the sublimation point temperature is-63.8 ℃ at normal pressure. The sulfur hexafluoride molecular structure is arranged in an octahedron shape, the bonding distance is small, and the bonding energy is high, so that the sulfur hexafluoride molecular structureThe stability is high, and the compatibility with the electric structural material is similar to that of nitrogen when the temperature does not exceed 180 ℃.
Sulfur hexafluoride is a breath agent and, at high concentrations, causes dyspnea, wheezing, bluish skin and mucous membranes, and general spasms.
The function and application of the sulfur hexafluoride comprise: a new generation of ultrahigh voltage insulating dielectric material is widely used for gas insulation of electronic and electrical equipment as a good gas insulator; can be used for smelting and casting process of nonferrous metal, and can also be used for degassing and purifying molten aluminum and aluminum alloy; the high-voltage switch is mainly used for arc extinction in the high-voltage switch and used as an insulating material in a high-capacity transformer and a high-voltage cable; used as a gas insulator for electronic devices and radar waveguides.
With the continuous development of power systems, the excellent insulating property and arc extinguishing property of sulfur hexafluoride gas are more and more widely applied in the power industry, and particularly, the application requirements of high-purity sulfur hexafluoride gas in the industries of mechanical manufacture, medicine, electronics and the like are continuously increased due to the ideal stability of the sulfur hexafluoride gas. Because the bottled sulfur hexafluoride gas of different specifications such as 40L, 8L and the like is convenient to transport, store and use, and is more and more favored by customers, the prior sulfur hexafluoride gas purification technology is mainly applied to batch industrial production, and the purification method comprises pressure swing adsorption, gas-liquid separation, membrane separation and the like, but the purity of the bottled sulfur hexafluoride gas is not high due to the low purity of the bottled sulfur hexafluoride filling raw material and the poor treatment of pipelines and gas cylinders in the filling process.
Disclosure of Invention
The invention aims to: the method is used for purifying bottled sulfur hexafluoride gas, and aims to solve the problem that the bottled sulfur hexafluoride gas is limited by raw material purity and filling process factors, and the general purity of the bottled sulfur hexafluoride gas is not as high as 99.99% of the purity requirement of the sulfur hexafluoride in the national standard.
The technical scheme adopted by the invention is as follows:
a method for purifying bottled sulfur hexafluoride gas comprises the following steps:
(1) placing a gas cylinder containing sulfur hexafluoride gas in a liquid containing tank, and pouring liquid nitrogen into the liquid containing tank;
(2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder;
(3) taking the gas cylinder out of the liquid containing tank, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder by using flowing water;
(4) and (3) repeating the steps (1), (2) and (3) for 1-6 times to obtain the purified sulfur hexafluoride gas.
In the technical scheme of the application: placing the gas cylinder filled with sulfur hexafluoride gas with purity not up to standard in a liquid containing tank, adding liquid nitrogen into the liquid containing tank, absorbing a large amount of heat when the liquid nitrogen is gasified, continuously cooling the sulfur hexafluoride in the gas cylinder until the temperature reaches the solidification temperature of the sulfur hexafluoride, sulfur hexafluoride becomes solid, impurity components such as nitrogen, oxygen and the like in sulfur hexafluoride gas exist in the upper space of the sulfur hexafluoride solid in the gas cylinder in a gas form, the gas in the gas cylinder is vacuumized, the impurity gas in the gas cylinder is pumped out completely, taking out the gas cylinder from the liquid containing tank, thawing and gasifying the sulfur hexafluoride solid in the gas cylinder by using flowing water, repeating the steps for 1-6 times, completely pumping out impurities in the gas cylinder, the purity of the purified sulfur hexafluoride gas is 99.99-99.999% by detecting the purified sulfur hexafluoride by using the conventional gas chromatography in the field. The method for purifying the bottled sulfur hexafluoride gas is simple and easy to implement, short in purification time and suitable for purifying the bottled sulfur hexafluoride gas.
Preferably, the gas cylinder in the step (1) is a steel cylinder.
Preferably, the specification of the gas cylinder in the step (1) is 2-40L.
Preferably, the specification of the gas cylinder in the step (1) is 4L, 8L, 10L or 15L.
Preferably, the liquid level of the liquid nitrogen in the liquid containing tank in the step (1) is 1/3-2/3 of the height of the gas cylinder. The liquid level of liquid nitrogen in the liquid containing tank is 1/3-2/3 of the height of the gas cylinder, and space is reserved for the gasification flash evaporation.
Preferably, a vacuum pump is adopted in the step (2) to pump away the impurity gas in the gas cylinder.
Preferably, the impurity gas comprises nitrogen or oxygen.
Preferably, steps (1), (2) and (3) are repeated 2, 3, 4 or 5 times in step (4).
Preferably, the purity of the sulfur hexafluoride gas in the gas cylinder in the step (1) is 99.90-99.99%.
Preferably, the purity of the sulfur hexafluoride gas purified in the step (4) is 99.99-99.999%.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the method for purifying the bottled sulfur hexafluoride gas is simple and easy to implement, short in purification time and suitable for purifying the just-bottled sulfur hexafluoride gas, and the purity of the purified sulfur hexafluoride gas is 99.99-99.999%;
2. the sulfur hexafluoride gas with low purity contains toxic gas, impurities can affect the insulativity and stability of the sulfur hexafluoride gas, the sulfur hexafluoride gas can be decomposed under electric arcs when the sulfur hexafluoride gas is used in the power industry, the decomposition of the gas impurities can be accelerated with higher degree, the purity of the sulfur hexafluoride gas reaches 99.995 percent after the sulfur hexafluoride gas is purified in a bottle, and the decomposition of the sulfur hexafluoride is weakened;
3. the method fills the gap which is basically absent in the market on the aspect of purifying the bottled gas sulfur hexafluoride;
4. the liquid level of liquid nitrogen in the liquid containing tank is 1/3-2/3 of the height of the gas cylinder, so that space is reserved for the gasification flash evaporation;
5. the steps (1), (2) and (3) are repeated, so that the purity of the sulfur hexafluoride gas is higher;
6. the principle that sulfur hexafluoride is solidified at low temperature and the impurity gas is gaseous is utilized to remove the impurity gas in the sulfur hexafluoride, the solid sulfur hexafluoride is unfrozen and gasified by using flowing water after the impurity gas is removed, and the impurity gas in the sulfur hexafluoride gas can be removed by repeating the steps for many times.
Drawings
FIG. 1 is a schematic view of the structure of the liquid tank, the gas cylinder and the vacuum pump of the present invention.
The labels in the figure are: 1-a vacuum pump, 2-a gas cylinder and 3-a liquid containing tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, a method for purifying bottled sulfur hexafluoride gas includes the following steps:
(1) placing a gas bottle 2 containing sulfur hexafluoride gas in a liquid containing groove 3, pouring liquid nitrogen into the liquid containing groove 3, wherein the gas bottle 2 is a copper bottle, the specification of the gas bottle 2 is 40L, and the liquid level height of the liquid nitrogen in the liquid containing groove 3 is 1/3 of the height of the gas bottle 2;
(2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder 2, and pumping away the impurity gas in the gas cylinder 2 by using a vacuum pump 1, wherein the impurity gas comprises nitrogen or oxygen;
(3) taking the gas cylinder 2 out of the liquid containing tank 3, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder 2 by using flowing water;
(4) and (3) repeating the steps (1), (2) and (3) for 4 times to obtain the purified sulfur hexafluoride gas.
The purity of the purified sulfur hexafluoride gas was 99.995% as determined by gas chromatography.
Example 2
As shown in fig. 1, a method for purifying bottled sulfur hexafluoride gas includes the following steps:
(1) placing a gas bottle 2 containing sulfur hexafluoride gas in a liquid containing tank 3, pouring liquid nitrogen into the liquid containing tank 3, wherein the gas bottle 2 is a steel bottle, the specification of the gas bottle 2 is 15L, and the liquid level height of the liquid nitrogen in the liquid containing tank 3 is 1/2 of the height of the gas bottle 2;
(2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder 2, and pumping away the impurity gas in the gas cylinder 2 by using a vacuum pump 1, wherein the impurity gas comprises nitrogen or oxygen;
(3) taking the gas cylinder 2 out of the liquid containing tank 3, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder 2 by using flowing water;
(4) and (3) repeating the steps (1), (2) and (3) for 3 times to obtain the purified sulfur hexafluoride gas.
The purity of the purified sulfur hexafluoride gas was 99.994% as determined by gas chromatography.
Example 3
As shown in fig. 1, a method for purifying bottled sulfur hexafluoride gas includes the following steps:
(1) placing a gas bottle 2 containing sulfur hexafluoride gas in a liquid containing tank 3, pouring liquid nitrogen into the liquid containing tank 3, wherein the gas bottle 2 is a steel bottle, the specification of the gas bottle 2 is 4L, and the liquid level height of the liquid nitrogen in the liquid containing tank 3 is 2/3 of the height of the gas bottle 2;
(2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder 2, and pumping away the impurity gas in the gas cylinder 2 by using a vacuum pump 1, wherein the impurity gas comprises nitrogen or oxygen;
(3) taking the gas cylinder 2 out of the liquid containing tank 3, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder 2 by using flowing water;
(4) and (3) repeating the steps (1), (2) and (3) for 2 times to obtain the purified sulfur hexafluoride gas.
The purity of the purified sulfur hexafluoride gas was 99.993% as determined by gas chromatography.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for purifying bottled sulfur hexafluoride gas is characterized by comprising the following steps:
(1) placing a gas cylinder containing sulfur hexafluoride gas in a liquid containing tank, and pouring liquid nitrogen into the liquid containing tank;
(2) after the sulfur hexafluoride becomes solid, pumping away impurity gas in the gas cylinder;
(3) taking the gas cylinder out of the liquid containing tank, and thawing and gasifying sulfur hexafluoride solid in the gas cylinder by using flowing water;
(4) and (3) repeating the steps (1), (2) and (3) for 1-6 times to obtain the purified sulfur hexafluoride gas.
2. The method for purifying sulfur hexafluoride gas in a bottle as claimed in claim 1, wherein the gas bottle in step (1) is a steel bottle.
3. The method of purifying sulfur hexafluoride gas in a bottle of gas as recited in claim 1, wherein the size of the gas bottle in step (1) is 2-40L.
4. The method of purifying sulfur hexafluoride gas in a bottle of claim 1, wherein the size of the gas bottle in step (1) is 4L, 8L, 10L or 15L.
5. The method for purifying sulfur hexafluoride gas in bottles of claim 1, wherein in step (1), the liquid nitrogen in the liquid tank has a liquid level height of 1/3-2/3 of the height of the gas bottle.
6. The method for purifying sulfur hexafluoride gas in a bottle as claimed in claim 1, wherein in the step (2), the impurity gas in the gas bottle is pumped away by a vacuum pump.
7. A method of purifying bottled sulphur hexafluoride gas as claimed in claim 1 or claim 4, wherein the contaminant gas includes nitrogen or oxygen.
8. A method of purifying bottled sulphur hexafluoride gas as claimed in claim 1, wherein step (1), (2) and (3) are repeated 3 times in step (4).
9. The method of purifying sulfur hexafluoride gas in a cylinder as claimed in claim 1, wherein the purity of the sulfur hexafluoride gas in the cylinder in step (1) is 99.90-99.99%.
10. The method for purifying bottled sulfur hexafluoride gas as claimed in claim 1, wherein the purity of the sulfur hexafluoride gas purified in the step (4) is 99.99-99.999%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177271.6A CN112279219A (en) | 2020-10-28 | 2020-10-28 | Method for purifying bottled sulfur hexafluoride gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177271.6A CN112279219A (en) | 2020-10-28 | 2020-10-28 | Method for purifying bottled sulfur hexafluoride gas |
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| Publication Number | Publication Date |
|---|---|
| CN112279219A true CN112279219A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011177271.6A Pending CN112279219A (en) | 2020-10-28 | 2020-10-28 | Method for purifying bottled sulfur hexafluoride gas |
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| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3198557U (en) * | 2015-04-25 | 2015-07-09 | 日本協同エネルギー株式会社 | Sulfur hexafluoride gas purification equipment |
| CN108355461A (en) * | 2018-04-16 | 2018-08-03 | 西安交通大学 | Sulfur hexafluoride and nitrogen mixed gas purification separation purifying plant and its reclaiming clean purify sulfur hexafluoride method |
-
2020
- 2020-10-28 CN CN202011177271.6A patent/CN112279219A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3198557U (en) * | 2015-04-25 | 2015-07-09 | 日本協同エネルギー株式会社 | Sulfur hexafluoride gas purification equipment |
| CN108355461A (en) * | 2018-04-16 | 2018-08-03 | 西安交通大学 | Sulfur hexafluoride and nitrogen mixed gas purification separation purifying plant and its reclaiming clean purify sulfur hexafluoride method |
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