CN108837540A - Petrochemical industry compound wall reboiler - Google Patents
Petrochemical industry compound wall reboiler Download PDFInfo
- Publication number
- CN108837540A CN108837540A CN201810933192.XA CN201810933192A CN108837540A CN 108837540 A CN108837540 A CN 108837540A CN 201810933192 A CN201810933192 A CN 201810933192A CN 108837540 A CN108837540 A CN 108837540A
- Authority
- CN
- China
- Prior art keywords
- reboiler
- shell
- petrochemical industry
- liner
- liquid
- Prior art date
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
- B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a kind of petrochemical industry compound wall reboilers,Including pedestal,The top of the pedestal is fixedly installed with reboiler shell by mounting rack,Shell in reboiler is provided on the inside of the reboiler shell,Reboiler liner is provided in the reboiler on the inside of shell,The side of the reboiler shell is provided with side flange baffle,The top of the pedestal is provided with heater box,Heating plate is provided on the inside of the heater box,The top of the heater box is connected with liquid pump by transmission pipeline,The side of the liquid pump is provided with connecting pipe,The connecting pipe through side flange baffle inside and extend to the inside of reboiler liner,The present invention is provided with knockout drum,Spiral deflector and filter chamber,When avoiding using petrochemical industry reboiler,Petrochemical industry reboiler is difficult to be filtered the liquid of entrance before feed liquid in heating fractionating column,Impurity precipitates for a long time and the bottom of the device,The problem of influencing the using effect of petrochemical industry reboiler.
Description
Technical field
The invention belongs to petrochemical equipment technical fields, and in particular to a kind of petrochemical industry compound wall reboiler.
Background technique
Reboiler, which is one, can exchange heat, while have a kind of special heat exchanger of vaporization space.In reboiler
Material liquid level and fractionating column liquid level are in sustained height.Liquid phase is provided from tower bottom line to enter in reboiler.Usually in reboiler
There is the liquid phase of 25-30% to be vaporized.The two phase flow being vaporized is sent back in fractionating column, and the gaseous component returned in tower leads to upwards
Tower tray is crossed, and liquid phase component falls to return to tower bottom.Material is even vaporized in reboiler expanded by heating, and density becomes smaller, to leave vapour
Change space, smoothly return in tower, returns to the gas-liquid two-phase in tower.
But when using petrochemical industry reboiler, petrochemical industry reboiler be difficult in heating fractionating column before feed liquid into
The liquid entered is filtered, and impurity precipitates for a long time and the bottom of the device, influences the using effect and petroleum of petrochemical industry reboiler
After chemical industry reboiler is difficult to avoid that feed liquid evaporation, steam is condensed back on device top, influences petrochemical industry reboiler evaporation effect
Rate, while petrochemical industry reboiler is difficult to the heat in save set, heat is dispersed on the outside of device, so that device external temperature
It is excessively high, influence the safety of petrochemical industry reboiler used.
Summary of the invention
The purpose of the present invention is to provide a kind of petrochemical industry compound wall reboilers, to solve using existing using weight
When boiling device, it is difficult to the liquid of entrance is filtered and is difficult to avoid that steam on device top before feed liquid in heating fractionating column
The problem of heat for being condensed back and being difficult in save set.
To achieve the above object, the present invention provides the following technical solutions：A kind of petrochemical industry compound wall reboiler, including
The top of pedestal, the pedestal is fixedly installed with reboiler shell by mounting rack, is provided on the inside of the reboiler shell
Shell in reboiler is provided with reboiler liner on the inside of shell in the reboiler, and the side of the reboiler shell is provided with side
Flange baffle, the top of the pedestal are provided with heater box, and heating plate is provided on the inside of the heater box, the heater box
Top is connected with liquid pump by transmission pipeline, and the side of the liquid pump is provided with connecting pipe, and the connecting pipe is through side
The end of the inside of flange baffle and the inside for extending to reboiler liner, the connecting pipe is provided with hot oil pipeline, described
The end of hot oil pipeline is connected with reboiler liner, is connected with delivery line in the reboiler on the outside of shell, the delivery line
End is connected with heater box.
Preferably, it is connected with vacuum tube on the outside of the reboiler shell, the end of the vacuum tube is connected with vacuum pump.
Preferably, the outer sheath of the hot oil pipeline is equipped with heat-conducting plate, and the heat-conducting plate is provided with seven, described in seven altogether
Heat-conducting plate is respectively positioned on the outside of hot oil pipeline.
Preferably, it is provided with vapor transmission pipe on the inside of the reboiler liner, the vapor transmission pipe is through reboiling
The side wall of device shell and the outside for extending to reboiler shell.
Preferably, the end of the vapor transmission pipe is provided with fractionating column, and the side of the fractionating column is provided with liquid material biography
Defeated pipe.
Preferably, the end of the liquid material transfer tube is connected with knockout drum, offers spiral on the inner wall of the knockout drum
Deflector is provided with net-like spacer on the inside of the knockout drum.
Preferably, the net-like spacer is located at the lower position of spiral deflector.
Preferably, the side of the knockout drum is connected with filter chamber by pipeline, is provided on the inside of the filter chamber
Filter plate.
Preferably, the side of the filter chamber is provided with liquid material ingress pipe, and the liquid material ingress pipe is through in reboiler
The inside of shell and the inside for extending to reboiler liner.
Preferably, the side of the reboiler shell is equipped with controller, and the vacuum pump and liquid pump are electric with controller
Property connection.
Compared with prior art, the present invention having the advantages that：
(1) present invention is provided with knockout drum, spiral deflector and filter chamber, and the liquid in fractionating column is flowed by liquid material transfer tube
Into knockout drum, liquid flows into knockout drum by liquid material transfer tube, and spiral deflector in knockout drum under the action of forms rotation
It flows, the impurity in liquid is precipitated in the bottom end of knockout drum, and impurity is fallen below the net-like spacer of knockout drum bottom end, in knockout drum
Liquid is flowed in filter chamber by pipeline, and the filter plate on the inside of filter chamber filters off the residual impurity in liquid, by filter chamber's mistake
The liquid of filter is flowed in reboiler liner by liquid material ingress pipe, when avoiding using petrochemical industry reboiler, petrochemical industry weight
Boiling device is difficult to be filtered the liquid of entrance before feed liquid in heating fractionating column, and impurity precipitates for a long time and the bottom of the device, influences
The problem of using effect of petrochemical industry reboiler.
(2) present invention is provided with hot oil pipeline, reboiler liner and heat-conducting plate, and the conduction oil in heater box is pumped by liquid pump
It is transferred in hot oil pipeline to connecting pipe, and by connecting pipe, when conduction oil flows through hot oil pipeline, hot oil pipeline is reboiling
Liquid heating in device liner, meanwhile, heat-conducting plate increases the heat dissipation area of hot oil pipeline, flows through the conduction oil of hot oil pipeline most
It is flowed in reboiler between shell and reboiler liner by the end of hot oil pipeline eventually, is the liquid insulating in reboiler liner,
It also avoids being condensed back during steam outflow, conduction oil shell and reboiler liner from reboiler form the bottom stream of interlayer
To top, and by the delivery line stream on shell top in reboiler can in heater box, when avoiding using petrochemical industry reboiler,
After petrochemical industry reboiler is difficult to avoid that feed liquid evaporation, steam is condensed back on device top, influences the steaming of petrochemical industry reboiler
The problem of sending out efficiency.
(3) present invention makes vacuum pump will be outside reboiler by vacuum tube provided with shell in vacuum pump, vacuum tube and reboiler
It is evacuated between shell in shell and reboiler, convenient for being conduction oil from the thermally conductive oil thermal insulating in reboiler in shell, convenient for saving heat
Amount, when avoiding using petrochemical industry reboiler, petrochemical industry reboiler is difficult to the heat in save set, and heat is dispersed into dress
Outside is set, so that device external temperature is excessively high, the problem of influencing the safety of petrochemical industry reboiler used.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is knockout drum structural schematic diagram of the invention；
Fig. 3 is a-quadrant enlarged drawing of the invention；
Fig. 4 is cross-sectional view of the invention.
In figure：Shell, 3- reboiler liner, 4- vapor transmission pipe, 5- fractionating column, 6- in 1- reboiler shell, 2- reboiler
Liquid material transfer tube, 7- knockout drum, 8- spiral deflector, the filter chamber 9-, 10- liquid material ingress pipe, 11- hot oil pipeline, 12- are thermally conductive
Plate, 13- side flange baffle, 14- heating plate, 15- heater box, 16- vacuum pump, 17- vacuum tube, 18- delivery line, 19- liquid pump,
20- controller, 21- filter plate, 22- net-like spacer, 23- pedestal, 24- connecting pipe.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It please refers to shown in Fig. 1-4, the present invention provides the following technical solutions：A kind of petrochemical industry compound wall reboiler, packet
Pedestal 23 is included, the top of pedestal 23 is fixedly installed with reboiler shell 1 by mounting rack, and the inside of reboiler shell 1 is provided with
Shell 2 in reboiler, the inside of shell 2 is provided with reboiler liner 3 in reboiler, and the side of reboiler shell 1 is provided with side flange
Baffle 13, the top of pedestal 23 are provided with heater box 15, and the inside of heater box 15 is provided with heating plate 14, the top of heater box 15
Liquid pump 19 is connected with by transmission pipeline, and the side of liquid pump 19 is provided with connecting pipe 24, and connecting pipe 24 is through side flange
The inside of baffle 13 and the inside for extending to reboiler liner 3, the end of connecting pipe 24 are provided with hot oil pipeline 11, hot oil pipe
The end in road 11 is connected with reboiler liner 3, and the outside of shell 2 is connected with delivery line 18 in reboiler, and the end of delivery line 18 connects
It is connected to heater box 15, user controls liquid pump 19 by controller 20 and runs, and the conduction oil in heater box 15 is pumped by liquid pump 19
It is transferred in hot oil pipeline 11 to connecting pipe 24, and by connecting pipe 24, when conduction oil flows through hot oil pipeline 11, hot oil pipe
Road 11 is the liquid heating in reboiler liner 3, meanwhile, heat-conducting plate 12 increases the heat dissipation area of hot oil pipeline 11, flows through heat
The conduction oil of oil-piping 11 flows in reboiler between shell 2 and reboiler liner 3 eventually by the end of hot oil pipeline 11, attaches most importance to
The liquid insulating in device liner 3 is boiled, also avoids being condensed back during steam outflow, conduction oil shell 2 and again from reboiler
The bottom that boiling device liner 3 forms interlayer flows to top, and can arrive heater box 15 by 18 stream of delivery line on 2 top of shell in reboiler
Interior, the steam in reboiler liner 3 is flow back into fractionating column 5 by vapor transmission pipe 4.
In the present invention, it is preferred that the outside of reboiler shell 1 is connected with vacuum tube 17, and the end of vacuum tube 17 is connected with
Vacuum pump 16, vacuum pump 16 will be evacuated by vacuum tube 17 between shell 2 in reboiler shell 1 and reboiler, convenient for lead
Hot oil avoids heat loss from the thermally conductive oil thermal insulating in reboiler in shell 2.
In the present invention, it is preferred that the outer sheath of hot oil pipeline 11 is equipped with heat-conducting plate 12, and heat-conducting plate 12 is provided with seven altogether,
Seven heat-conducting plates 12 are respectively positioned on the outside of hot oil pipeline 11.
In the present invention, it is preferred that the inside of reboiler liner 3 is provided with vapor transmission pipe 4, vapor transmission pipe 4 through
The side wall of reboiler shell 1 and the outside for extending to reboiler shell 1.
In the present invention, it is preferred that the end of vapor transmission pipe 4 is provided with fractionating column 5, and the side of fractionating column 5 is provided with liquid
Expect transfer tube 6.
In the present invention, it is preferred that the end of liquid material transfer tube 6 is connected with knockout drum 7, offers on the inner wall of knockout drum 7
Spiral deflector 8, the inside of knockout drum 7 are provided with net-like spacer 22, and the liquid in fractionating column 5 is flowed by liquid material transfer tube 6
Into knockout drum 7, liquid flows into knockout drum 7 by liquid material transfer tube 6, shape under the action of spiral deflector 8 in knockout drum 7
At eddy flow, the impurity in liquid is precipitated in the bottom end of knockout drum 7, and impurity falls on 22 lower section of net-like spacer of 7 bottom end of knockout drum.
In the present invention, it is preferred that net-like spacer 22 is located at the lower position of spiral deflector 8.
In the present invention, it is preferred that the side of knockout drum 7 is connected with filter chamber 9, the inside setting of filter chamber 9 by pipeline
There is filter plate 21, the liquid in knockout drum 7 is flowed in filter chamber 9 by pipeline, and the filter plate 21 of 9 inside of filter chamber filters off liquid
In residual impurity, the liquid filtered by filter chamber 9 flowed in reboiler liner 3 by liquid material ingress pipe 10.
In the present invention, it is preferred that the side of filter chamber 9 is provided with liquid material ingress pipe 10, and liquid material ingress pipe 10 is through again
The inside of shell 2 and the inside of reboiler liner 3 is extended in boiling device.
In the present invention, it is preferred that the side of reboiler shell 1 is equipped with controller 20, vacuum pump 16 and liquid pump 19 with
Controller 20 is electrically connected, and controller 20 is set as PLC controller.
The working principle of the invention and process for using：In the use of the present invention, user's engaging means power supply, heater box 15
Interior conduction oil, in use, the liquid in fractionating column 5 is flowed into knockout drum 7 by liquid material transfer tube 6, liquid passes through liquid material
Transfer tube 6 flows into knockout drum 7, and spiral deflector 8 in knockout drum 7 under the action ofs forms eddy flow, the impurity in liquid point
Bottom end precipitating from tank 7, impurity fall on 22 lower section of net-like spacer of 7 bottom end of knockout drum, and the liquid in knockout drum 7 passes through pipeline stream
Into filter chamber 9, the filter plate 21 of 9 inside of filter chamber filters off the residual impurity in liquid, and the liquid filtered by filter chamber 9 is logical
It crosses liquid material ingress pipe 10 to flow in reboiler liner 3, user controls liquid pump 19 by controller 20 and runs, and liquid pump 19 will heat
Conduction oil in case 15 is pumped into connecting pipe 24, and is transferred in hot oil pipeline 11 by connecting pipe 24, and conduction oil flows through
When hot oil pipeline 11, hot oil pipeline 11 is the liquid heating in reboiler liner 3, meanwhile, heat-conducting plate 12 increases hot oil pipeline
11 heat dissipation area, the conduction oil for flowing through hot oil pipeline 11 flow to 2 He of shell in reboiler eventually by the end of hot oil pipeline 11
It is the liquid insulating in reboiler liner 3 between reboiler liner 3, also avoids being condensed back during steam outflow, vacuum
Pump 16 will be evacuated between shell 2 by vacuum tube 17 in reboiler shell 1 and reboiler, convenient for being conduction oil from reboiler
Thermally conductive oil thermal insulating in shell 2, avoids heat loss, and conduction oil shell 2 and reboiler liner 3 from reboiler form the bottom of interlayer
Top is flowed to, and can be arrived in heater box 15 by 18 stream of delivery line on 2 top of shell in reboiler, the steam in reboiler liner 3
It is flow back into fractionating column 5 by vapor transmission pipe 4.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions.By sentence " element limited including one ..., it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element ".
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of petrochemical industry compound wall reboiler, including pedestal（23）, it is characterised in that：The pedestal（23）Top it is logical
It crosses mounting rack and is fixedly installed with reboiler shell（1）, the reboiler shell（1）Inside be provided with shell in reboiler（2）, institute
State shell in reboiler（2）Inside be provided with reboiler liner（3）, the reboiler shell（1）Side be provided with side flange
Baffle（13）, the pedestal（23）Top be provided with heater box（15）, the heater box（15）Inside be provided with heating plate
（14）, the heater box（15）Top liquid pump is connected with by transmission pipeline（19）, the liquid pump（19）Side be provided with
Connecting pipe（24）, the connecting pipe（24）Through side flange baffle（13）Inside and extend to reboiler liner（3）
Inside, the connecting pipe（24）End be provided with hot oil pipeline（11）, the hot oil pipeline（11）End be connected with
Reboiler liner（3）, shell in the reboiler（2）Outside be connected with delivery line（18）, the delivery line（18）End connect
It is connected to heater box（15）.
2. a kind of petrochemical industry compound wall reboiler according to claim 1, it is characterised in that：The reboiler shell
（1）Outside be connected with vacuum tube（17）, the vacuum tube（17）End be connected with vacuum pump（16）.
3. a kind of petrochemical industry compound wall reboiler according to claim 1, it is characterised in that：The hot oil pipeline
（11）Outer sheath be equipped with heat-conducting plate（12）, the heat-conducting plate（12）It is provided with seven altogether, seven heat-conducting plates（12）Equal position
In hot oil pipeline（11）Outside.
4. a kind of petrochemical industry compound wall reboiler according to claim 3, it is characterised in that：The reboiler liner
（3）Inside be provided with vapor transmission pipe（4）, the vapor transmission pipe（4）Through reboiler shell（1）Side wall and extension
To reboiler shell（1）Outside.
5. a kind of petrochemical industry compound wall reboiler according to claim 4, it is characterised in that：The vapor transmission pipe
（4）End be provided with fractionating column（5）, the fractionating column（5）Side be provided with liquid material transfer tube（6）.
6. a kind of petrochemical industry compound wall reboiler according to claim 5, it is characterised in that：The liquid material transfer tube
（6）End be connected with knockout drum（7）, the knockout drum（7）Inner wall on offer spiral deflector（8）, the knockout drum
（7）Inside be provided with net-like spacer（22）.
7. a kind of petrochemical industry compound wall reboiler according to claim 5, it is characterised in that：The net-like spacer
（22）Positioned at spiral deflector（8）Lower position.
8. a kind of petrochemical industry compound wall reboiler according to claim 7, it is characterised in that：The knockout drum（7）
Side filter chamber is connected with by pipeline（9）, the filter chamber（9）Inside be provided with filter plate（21）.
9. a kind of petrochemical industry compound wall reboiler according to claim 8, it is characterised in that：The filter chamber（9）
Side be provided with liquid material ingress pipe（10）, the liquid material ingress pipe（10）Through shell in reboiler（2）Inside and extension
To reboiler liner（3）Inside.
10. a kind of petrochemical industry compound wall reboiler according to claim 5, it is characterised in that：Outside the reboiler
Shell（1）Side controller is installed（20）, the vacuum pump（16）And liquid pump（19）And controller（20）It is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933192.XA CN108837540A (en) | 2018-08-16 | 2018-08-16 | Petrochemical industry compound wall reboiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933192.XA CN108837540A (en) | 2018-08-16 | 2018-08-16 | Petrochemical industry compound wall reboiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108837540A true CN108837540A (en) | 2018-11-20 |
Family
ID=64188123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810933192.XA Pending CN108837540A (en) | 2018-08-16 | 2018-08-16 | Petrochemical industry compound wall reboiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108837540A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114259742A (en) * | 2021-12-28 | 2022-04-01 | 邓成霞 | Multilayer wall reboiler for petrochemical |
| CN115228123A (en) * | 2022-07-29 | 2022-10-25 | 福建龙氟化工有限公司 | Reboiler for producing electronic grade hydrogen fluoride |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122357U (en) * | 1991-11-07 | 1992-11-18 | 沈善明 | Plate type steam heating vacuum crying cabinet |
| CN203990582U (en) * | 2014-01-02 | 2014-12-10 | 北京宝沃石油技术有限责任公司 | A kind of controllable temperature heating reactor |
| CN205019740U (en) * | 2015-09-08 | 2016-02-10 | 山东成泰化工有限公司 | Use reboiler at bottom of fractionating tower |
| CN207452026U (en) * | 2018-01-29 | 2018-06-05 | 洋浦傲立石化有限公司 | A kind of continuous rectification system for Petroleum Production |
| CN207562381U (en) * | 2017-10-13 | 2018-07-03 | 茂名瑞派石化工程有限公司 | A kind of novel kettle type reboiler |
-
2018
- 2018-08-16 CN CN201810933192.XA patent/CN108837540A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122357U (en) * | 1991-11-07 | 1992-11-18 | 沈善明 | Plate type steam heating vacuum crying cabinet |
| CN203990582U (en) * | 2014-01-02 | 2014-12-10 | 北京宝沃石油技术有限责任公司 | A kind of controllable temperature heating reactor |
| CN205019740U (en) * | 2015-09-08 | 2016-02-10 | 山东成泰化工有限公司 | Use reboiler at bottom of fractionating tower |
| CN207562381U (en) * | 2017-10-13 | 2018-07-03 | 茂名瑞派石化工程有限公司 | A kind of novel kettle type reboiler |
| CN207452026U (en) * | 2018-01-29 | 2018-06-05 | 洋浦傲立石化有限公司 | A kind of continuous rectification system for Petroleum Production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114259742A (en) * | 2021-12-28 | 2022-04-01 | 邓成霞 | Multilayer wall reboiler for petrochemical |
| CN115228123A (en) * | 2022-07-29 | 2022-10-25 | 福建龙氟化工有限公司 | Reboiler for producing electronic grade hydrogen fluoride |
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