CN108928804B - Use method of washing tower for preparing hydrogen fluoride - Google Patents
Use method of washing tower for preparing hydrogen fluoride Download PDFInfo
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- CN108928804B CN108928804B CN201811207314.3A CN201811207314A CN108928804B CN 108928804 B CN108928804 B CN 108928804B CN 201811207314 A CN201811207314 A CN 201811207314A CN 108928804 B CN108928804 B CN 108928804B
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 238000005406 washing Methods 0.000 title claims abstract description 111
- 229910000040 hydrogen fluoride Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 98
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 239000002253 acid Substances 0.000 claims abstract description 43
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims description 30
- 238000009833 condensation Methods 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052731 fluorine Inorganic materials 0.000 abstract description 4
- 239000011737 fluorine Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 29
- 238000006243 chemical reaction Methods 0.000 description 11
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 238000007872 degassing Methods 0.000 description 4
- 239000010436 fluorite Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- 239000011343 solid material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910003638 H2SiF6 Inorganic materials 0.000 description 2
- 229910004014 SiF4 Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 2
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 2
- ZEFWRWWINDLIIV-UHFFFAOYSA-N tetrafluorosilane;dihydrofluoride Chemical compound F.F.F[Si](F)(F)F ZEFWRWWINDLIIV-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012595 freezing medium Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002023 wood 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
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/192—Preparation from fluorspar
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/195—Separation; Purification
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention relates to the technical field of fluorine chemical industry, in particular to a using method of a washing tower for preparing hydrogen fluoride. The method is characterized in that: hydrofluoric acid gas is led in through the gas-guide tube, flows through the tower tray and the liquid-separating tray upwards in the washing tower body, transfers heat with the washing acid spread by the spraying assembly, and enters the gas inlet of the first-stage condenser through the gas outlet, and the hydrofluoric acid gas is discharged through the liquid remover and the gas outlet after completing heat exchange through the condensing tube plate assembly.
Description
Technical Field
The invention relates to the technical field of fluorine chemical industry, in particular to a using method of a washing tower for preparing hydrogen fluoride.
Background
Hydrogen fluoride has been widely used in the industries of electronics, chemical industry, petroleum and the like, and is mainly used for preparing villiaumite, fluorine-halogen alkane, fluorine refrigerant, corrosion glass, wood impregnation, electrolysis of elemental fluorine and the like. The Chinese invention patent (with the patent number of CN201310287202.4, the patent name is an anhydrous hydrogen fluoride production method) discloses an anhydrous hydrogen fluoride production method, which is characterized by comprising the following steps: feeding fluorite powder and sulfuric acid into a pre-reactor; in a pre-reactor, sulfuric acid and fluorite powder are fully mixed and react at the same time to generate crude hydrogen fluoride gas; removing impurities from the crude hydrogen fluoride gas through a pre-purification tower and a washing tower, then sequentially passing through two condensers, condensing most of the hydrogen fluoride gas by a freezing medium, refluxing condensate obtained in the first condenser to the pre-purification tower, and pumping crude acid condensate obtained in the second condenser to a rectifying tower through a second crude acid pump for refining; anhydrous hydrofluoric acid leaves the rectifying tower by means of the pressure of the tower and flows to an anhydrous hydrogen fluoride finished product storage tank through a finished product cooler; the non-condensable gas at the top of the rectifying tower and in the hydrogen fluoride condenser enters a sulfuric acid absorption tower; sulfuric acid flows downwards from the top of the tower and absorbs hydrogen fluoride in a gas phase; returning the sulfuric acid containing hydrogen fluoride to the scrubber with a pump; the gas leaving the top of the sulfuric acid absorption tower passes through a water washing tower to obtain a byproduct, namely fluosilicic acid; the sulfuric acid absorbed with hydrogen fluoride is returned to the pre-reactor through the washing tower. The Chinese invention patent (with the patent number of CN201210506779.5, the patent name is a preparation method of anhydrous hydrogen fluoride) discloses a preparation method of anhydrous hydrogen fluoride, which is characterized by comprising the following steps: a) respectively heating mixed sulfuric acid and fluorspar powder, mixing in a pre-reactor according to a certain feeding weight ratio, and carrying out pre-reaction to obtain a mixed material, wherein the mixed sulfuric acid is a mixture of concentrated sulfuric acid and fuming sulfuric acid, and the weight ratio of the sulfuric acid to the fuming sulfuric acid is 1: 1.40-1.50; the heating time of the mixed sulfuric acid is 7-8 minutes, and the heating temperature is 100-120 ℃; b) continuously feeding the mixed material into a converter reactor, reacting the mixed material at 550-650 ℃ and 700-800 ℃ for 50-70 minutes under the conditions that the rotating speed of the converter reactor is 1.0 r/min-2.0 r/min and the pressure in the converter is-0.55-0.45 KPa, so as to obtain crude hydrogen fluoride gas and solid material, feeding part of the obtained solid material into the converter reactor through a material returning device for secondary reaction, and feeding the rest solid material into a dihydrate gypsum production device; c) treating the crude hydrogen fluoride gas by a washing tower, a condenser, a rectifying tower and a degassing tower to obtain pure hydrogen fluoride gas and residual gas; d) recycling the residual gas by using sulfuric acid to absorb hydrogen fluoride gas; e) and residual gas which is not recycled is discharged from the top of the tail gas tower after being treated by a water washing tower and a tail gas tower.
The hydrogen fluoride separation impurity refining device in the prior art 1 and the prior art 2 is a pre-purification tower, a washing tower, a condenser, a rectifying tower and a degassing tower which are commonly used at present, wherein washing and condensing are one of the processes of refining anhydrous hydrogen fluoride generally, and the prior art mainly has the problems that washing acid coming out of the bottom of the washing tower enters a washing circulation storage tank, a washing acid pipeline is generally inserted into the washing circulation storage tank, the liquid level of the washing acid rises below 800mm, if too much gas is back-mixed with acid liquor, the liquid level of the washing acid in the washing tower rises, a gas guide pipe for conveying hydrofluoric acid gas is blocked and flows back to a reaction furnace, and corrosion is caused to a reaction furnace body.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a using method of a washing tower for preparing hydrogen fluoride, which is characterized in that:
before use, the liquid level conditions of the washing tower, the washing circulation storage tank and the first-stage condenser are observed through a liquid level meter, the liquid level is ensured to be 1000mm away from the gas guide pipe and the gas outlet and is higher than the outlet end of the washing circulation storage tank by more than 300 mm, an exhaust valve of the washing circulation storage tank is opened to exhaust a small amount of mixed gas, and the liquid seal is ensured to be in a normal working state.
Step two, hydrofluoric acid gas is led in through a gas guide tube, the temperature of the hydrofluoric acid gas is 160 ℃, the hydrofluoric acid gas flows upwards in a washing tower body and flows through a tower tray and a liquid separation tray, the hydrofluoric acid gas and washing acid sprayed by a spraying assembly transfer heat and transfer heat, the cooled hydrofluoric acid gas enters a gas inlet of a primary condenser through a gas outlet, the gas inlet of the primary condenser and a primary condenser body are designed by adopting a Venturi tube principle, the purpose is to enable the hydrofluoric acid gas to enter the primary condenser body with a larger diameter after being compressed by the gas inlet with a smaller diameter and to be diffused, liquid drops are uniformly distributed in the hydrofluoric acid gas, so that the condensation efficiency of a condensation tube plate assembly is improved, the hydrofluoric acid gas is discharged through a liquid remover and a gas outlet after heat exchange is completed by the condensation tube plate assembly, the temperature of the gas outlet is controlled at 60 ℃, washing acid condensed by a washing tower is, washing acid condensed by the first-stage condenser is recycled to the washing circulation storage tank through the washing acid outlet II, and the washing acid pump assembly returns the washing acid in the washing circulation storage tank to the spraying assembly to wash condensed hydrofluoric acid gas.
The inventors found that fluorite (CaF) for producing hydrogen fluoride2) And sulfuric acid (H)2SO4) The following main reactions occur: CaF2+2H2S04→2HF+CaSO4The product entering the next process stage has mainly a heavy fraction H2SO4、H2O, light component SO2、SiF4、CO2、H2S, by-products including CaSO4、Fe2(SO4)3、H2SiF6. According to the requirements of national standard GB 7746-2SO4、H2O、H2SiF6、SO2The content of the hydrofluoric acid is limited, and the anhydrous hydrogen fluoride is prepared by removing impurities by washing, condensing, rectifying and degassing processes by utilizing the difference of the boiling points of the components, specifically, hydrofluoric acid gas enters a washing tower from a reaction furnace for washing, after dust and water impurities are removed, the hydrofluoric acid gas enters a condensing system from the washing tower, and crude hydrofluoric acid liquid (the main component of which is a heavy component H) is formed by primary condensation through primary, secondary and tertiary condensation and primary condensation after primary condensation through primary condensation2SO4、H2O) returns to the washing tower to condense and wash hydrofluoric acid gas, and crude hydrofluoric acid liquid (the main component is hydrofluoric acid) condensed from the second and third stages is sent into a degassing tower and a rectifying tower by a rectifying pump to further remove light component SO2、SiF4、CO2、H2S and heavy component H2SO4、H2And O, obtaining the finished product of the anhydrous hydrogen fluoride. The prior art mainly solves the problems that the washing acid coming out of the bottom of the washing tower enters a washing circulation storage tank, a washing acid pipeline is generally inserted below the liquid level of the washing circulation storage tank, if too much gas is back-mixed by the acid liquor, the liquid level of the washing acid in the washing tower rises, a gas guide pipe for conveying hydrofluoric acid gas is blocked and flows back to a reaction furnace, and the reaction furnace body is corroded.
The inventor finds that the problem of blockage and backflow of a hydrofluoric acid gas guide tube to a reaction furnace is caused by the fact that a washing tower and a condenser cannot be effectively communicated to achieve gas-liquid two-phase balance, the gas-liquid two phases in the washing tower and the condenser are in a severe mass and heat transfer working state, the temperature and the pressure of the gas-liquid two phases are in extremely complex changes, and the requirement of balancing the gas-liquid two phases is difficult to achieve on any working surface in a working environment, so that the effective communication between the washing tower and the condenser is undoubtedly a good method under the condition that process conditions are allowed. The specific implementation mode is that the bottoms of the washing tower and the first-stage condenser are communicated with a washing circulation storage tank to form a U-shaped communicating vessel, washing acids of the washing tower and the first-stage condenser are collected in the washing circulation storage tank, and the surface of the washing acid liquid is more than 1000mm away from the gas guide pipe and the gas outlet, so that liquid seal is formed at the bottoms of the washing tower and the first-stage condenser, even if the washing acid in the washing circulation storage tank is continuously conveyed into a reaction furnace to react or returns to the washing tower to condense and wash hydrofluoric acid gas in work, the liquid level can be effectively balanced due to the mutual communication, and the liquid seal is always kept. Hydrofluoric acid gas finishes the condensation process through air duct, tower tray, liquid separation dish, spray set, gas vent, air inlet, condensation tube plate subassembly, liquid trap, gas outlet in proper order, and the scrubbing acid that condenses is separated with gas and is collected in the washing circulation storage tank through scrubbing acid export I and scrubbing acid export II, because the effect of liquid seal, hydrofluoric acid gas can't the cross flow take place back mixing phenomenon in the washing circulation storage tank, just can not take place to carry the problem that the air duct of hydrofluoric acid gas blocks up or even flows back to the reacting furnace.
Compared with the prior art, the invention at least has the following advantages: firstly, the bottoms of the washing tower and the first-stage condenser are communicated with a washing circulation storage tank to form a U-shaped communicating vessel, washing acids of the washing tower and the first-stage condenser are collected in the washing circulation storage tank, and the surface distance between the washing acid liquid and the gas guide pipe and the gas outlet is more than 1000mm, so that liquid seal is formed at the bottoms of the washing tower and the first-stage condenser, even if the washing acids in the washing circulation storage tank are continuously conveyed into a reaction furnace to react or return to the washing tower to condense and wash hydrofluoric acid gas in work, the liquid levels can be effectively balanced due to the mutual communication, and the liquid seal always keeps an effective working; secondly, due to the action of liquid seal, hydrofluoric acid gas can not flow into the washing circulation storage tank to cause back mixing, and the problem that the gas guide pipe for conveying the hydrofluoric acid gas is blocked and even flows back to the reaction furnace can not occur.
Drawings
FIG. 1 is a schematic front view of a scrubber for producing hydrogen fluoride according to the present invention.
FIG. 2 is a schematic top view of a process for the preparation of a hydrogen fluoride scrubber according to the present invention.
FIG. 3 is a schematic diagram of the arrangement of section A-A of a process for the preparation of a hydrogen fluoride scrubber according to the present invention.
1-washing tower 2-washing circulation storage tank 3-washing acid pump assembly 4-first-stage condenser
5-washing acid outlet I6-washing tower body 7-gas guide tube 8-tower tray 9-liquid separation disc
10-spraying component 11-exhaust port 12-air inlet 13-primary condenser body
14-a condensing tube plate assembly 15-a liquid remover 16-a gas outlet 17-a washing acid outlet II.
Detailed Description
The invention is further described with reference to the following detailed description of embodiments and drawings.
As shown in fig. 1, fig. 2 and fig. 3, a method for using a scrubber for preparing hydrogen fluoride is characterized in that: firstly, liquid level conditions of the washing tower 1, the washing circulation storage tank 2 and the first-stage condenser 4 are observed through a liquid level meter before use, the liquid level is ensured to be 1000mm away from the gas guide pipe 7 and the gas outlet 16 and more than 300 mm higher than the outlet end of the washing circulation storage tank 2, an exhaust valve of the washing circulation storage tank 2 is opened to exhaust a small amount of mixed gas, and the liquid seal is ensured to be in a normal working state.
Step two, hydrofluoric acid gas is led in through a gas guide tube 7, the temperature of the hydrofluoric acid gas is 160 ℃, the hydrofluoric acid gas flows upwards in a washing tower body 6 and flows through a tower tray 8 and a liquid distribution tray 9, the hydrofluoric acid gas and washing acid sprayed by a spraying assembly 10 transfer heat and mass, the cooled hydrofluoric acid gas enters a gas inlet 12 of a primary condenser 4 through a gas outlet 11, the gas inlet 12 of the primary condenser 4 and a primary condenser body 13 are designed by adopting a Venturi tube principle, the purpose is to enable the hydrofluoric acid gas to enter the primary condenser body 13 with a larger diameter after being compressed by the gas inlet 12 with a smaller diameter and to be diffused, liquid drops are uniformly distributed in the hydrofluoric acid gas, the condensation efficiency of a condenser plate assembly 14 is improved, the hydrofluoric acid gas is discharged through a liquid remover 15 and a gas outlet 16 after heat exchange is completed by the condenser plate assembly 14, the temperature of the gas outlet 16 is controlled at 60 ℃, washing acid condensed by a washing tower 1 is collected by the gas 8 and flows along the, washing acid condensed by the first-stage condenser 4 is recycled to the washing circulating storage tank 2 through the washing acid outlet II 17, and the washing acid in the washing circulating storage tank 2 is returned to the spraying assembly 10 by the washing acid pump assembly 3 to wash condensed hydrofluoric acid gas.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (2)
1. The use method of the washing tower for preparing the hydrogen fluoride is characterized in that: before use, observing the liquid level conditions of a washing tower, a washing circulating storage tank and a first-stage condenser through a liquid level meter, ensuring that the liquid level position is 1000mm lower than a gas guide pipe and a gas outlet and 300 mm higher than the outlet end of the washing circulating storage tank, opening an exhaust valve of the washing circulating storage tank to exhaust a small amount of mixed gas, and ensuring that a liquid seal is in a normal working state; and step two, hydrofluoric acid gas is led in through a gas guide pipe, the temperature of the hydrofluoric acid gas is 160 ℃, the hydrofluoric acid gas flows upwards in the washing tower body and flows through a tower tray and a liquid separation tray, the hydrofluoric acid gas and the washing acid sprayed by the spraying assembly transfer heat in a mass mode, the cooled hydrofluoric acid gas enters an air inlet of a primary condenser through an air outlet, the hydrofluoric acid gas is discharged through a liquid remover and an air outlet after heat exchange is completed through a condensing pipe plate assembly, the temperature of the air outlet is controlled to be 60 ℃, the washing acid condensed by the washing tower is collected by the tower tray, flows along the wall of the washing tower body and is recycled into a washing circulation storage tank through a washing acid outlet I, the washing acid condensed by the primary condenser is recycled into the washing circulation storage tank through a washing acid outlet II, and the washing acid in the washing.
2. The use method of the scrubber for preparing hydrogen fluoride according to claim 1, wherein the scrubber comprises: the air inlet of the first-stage condenser and the first-stage condenser body are designed by adopting a Venturi tube principle, and the purpose is to enable hydrofluoric acid gas to enter the first-stage condenser body with a larger diameter for diffusion after being compressed by the air inlet with a smaller diameter, so that liquid drops are uniformly distributed in the hydrofluoric acid gas, and the condensation efficiency of the condensation tube plate assembly is improved.
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| CN201811207314.3A CN108928804B (en) | 2018-10-17 | 2018-10-17 | Use method of washing tower for preparing hydrogen fluoride |
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| CN201811207314.3A CN108928804B (en) | 2018-10-17 | 2018-10-17 | Use method of washing tower for preparing hydrogen fluoride |
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| CN113735062A (en) * | 2021-09-15 | 2021-12-03 | 青海西矿同鑫化工有限公司 | Method for preparing hydrogen fluoride by recycling fluorite from rare earth |
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| TWI230094B (en) * | 2003-01-14 | 2005-04-01 | Desiccant Technology Corp | Method for exhaust treatment of perfluoro compounds |
| CN103848400B (en) * | 2012-12-03 | 2016-01-13 | 福建省邵武市永飞化工有限公司 | A kind of preparation method of anhydrous hydrogen fluoride |
| CN203529928U (en) * | 2013-10-31 | 2014-04-09 | 洛阳氟钾科技有限公司 | Hydrogen fluoride air washer |
| CN204588693U (en) * | 2015-03-20 | 2015-08-26 | 常熟三爱富氟化工有限责任公司 | Acid of Hydrofluoric Acid Production furnace gas washing section cyclic absorption device |
| CN105217576B (en) * | 2015-10-28 | 2017-12-01 | 浙江东瓯过滤机制造有限公司 | Filtration washing control method in hydrogen fluoride preparation technology |
| CN206082088U (en) * | 2016-10-17 | 2017-04-12 | 江西氟塑防腐设备集团有限公司 | Hydrogen fluoride tail gas washing tower |
| CN206244404U (en) * | 2016-11-24 | 2017-06-13 | 福建龙氟化工有限公司 | Circulating hydrogen fluoride wash device |
| CN107082407B (en) * | 2017-06-22 | 2019-01-25 | 多氟多化工股份有限公司 | A kind of method of purification of anhydrous hydrofluoric acid |
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Effective date of registration: 20220701 Address after: 410600 No. 8, Xinkang Road, economic development zone, Ningxiang suburban street, Changsha City, Hunan Province (in Hunan Hualiang Electric Appliance Industry Co., Ltd.) Patentee after: Hunan Kemai environmental protection equipment Co.,Ltd. Address before: 362000 the 2 floor of 32 new gate Street and 1916 Creative Industrial Park, Licheng District, Quanzhou, Fujian, China, 1916 Patentee before: Yang Song |
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Effective date of registration: 20240313 Address after: 417099 Duan Bian Group, Dougang Village, Shijing Town, Louxing District, Loudi City, Hunan Province Patentee after: Yan Zhiliang Country or region after: China Address before: 410600 No. 8, Xinkang Road, economic development zone, Ningxiang suburban street, Changsha City, Hunan Province (in Hunan Hualiang Electric Appliance Industry Co., Ltd.) Patentee before: Hunan Kemai environmental protection equipment Co.,Ltd. Country or region before: China |
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Effective date of registration: 20240409 Address after: Unit 15A8, 15A/F, Building 2, Wanwei Science and Technology Industrial Park, No. 136 Wanglong Road, Dongfanghong Street, High tech Development Zone, Changsha City, Hunan Province, 410205 Patentee after: Hunan Maihart Environmental Protection Technology Co.,Ltd. Country or region after: China Address before: 417099 Duan Bian Group, Dougang Village, Shijing Town, Louxing District, Loudi City, Hunan Province Patentee before: Yan Zhiliang Country or region before: China |
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