CN117732241A - Method for effectively decomposing fluorine-containing alkane substances - Google Patents
Method for effectively decomposing fluorine-containing alkane substances Download PDFInfo
- Publication number
- CN117732241A CN117732241A CN202311747404.2A CN202311747404A CN117732241A CN 117732241 A CN117732241 A CN 117732241A CN 202311747404 A CN202311747404 A CN 202311747404A CN 117732241 A CN117732241 A CN 117732241A
- Authority
- CN
- China
- Prior art keywords
- gas
- fluorine
- waste gas
- reaction
- containing alkane
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 28
- 239000011737 fluorine Substances 0.000 title claims abstract description 28
- 239000000126 substance Substances 0.000 title claims abstract description 15
- 150000001335 aliphatic alkanes Chemical class 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 28
- 239000002912 waste gas Substances 0.000 claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 claims abstract description 18
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- UJPMYEOUBPIPHQ-UHFFFAOYSA-N 1,1,1-trifluoroethane Chemical compound CC(F)(F)F UJPMYEOUBPIPHQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- 239000012495 reaction gas Substances 0.000 claims abstract description 7
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 claims abstract description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims abstract description 6
- 229910001868 water Inorganic materials 0.000 claims abstract description 5
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 4
- 231100000614 poison Toxicity 0.000 abstract description 4
- 239000003440 toxic substance Substances 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- -1 fluorocarbon hydrocarbon Chemical class 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000254 damaging effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for effectively decomposing fluorine-containing alkane substances, which comprises the following steps: collecting the waste gas containing fluorine organic matters discharged from a workshop, wherein the waste gas mainly contains fluorine organic matters such as R134a (tetrafluoroethane), R143a (trifluoroethane), R32 (difluoromethane) and R23 (trifluoromethane); introducing the waste gas into an electric heater for heating; introducing the gas into a catalytic reactor after heating, adding a catalyst, and carrying out catalytic oxidation on the fluorine-containing waste gas to react into carbon dioxide, hydrogen fluoride and water; after the reaction is finished, the rapid cooling of the reacted dare gas is carried out by a quencher; the cooled gas enters an alkaline washing tower, and the purified reaction gas can be discharged outwards through a chimney. Compared with the traditional incineration method, the invention adopts catalytic oxidation, thereby effectively reducing the reaction temperature and reducing the energy consumption; and the decomposition products obtained by adopting the catalytic oxidation method basically do not contain toxic substances such as carbon monoxide, fluorine gas and the like.
Description
Technical Field
The invention relates to the field of treatment of fluorocarbon hydrocarbon waste gas, in particular to a method for effectively decomposing fluorocarbon hydrocarbon substances.
Background
The chlorofluorocarbon and its substitutes are widely used in industries of refrigeration, foaming, cleaning, fire protection, aerosol and the like, and the replacement of CFCs and HCFCs is a current international hot topic because the CFCs and HCFCs widely used at present have a damaging effect on an ozone layer and generate a greenhouse effect, so that the industries all over the world face serious challenges. The main products of the present company are two novel refrigerants of difluoromethane and 1, 2-tetrafluoroethane in ODS substitutes, and the ozone destruction potential value (ODP value) is 0. Meanwhile, in the production process of difluoromethane and 1, 2-tetrafluoroethane, a certain amount of HFC gases such as trifluoromethane, trifluoroethane, pentafluoroethane and the like are generated due to the progress of side reaction, and all the substances are low-toxicity, slightly-toxic or nontoxic substances, and most of the waste gas is directly discharged, so that the waste gas can be directly discharged without treatment.
However, these substances belong to greenhouse gases, and at present, how to effectively treat these waste gases without pollution, which is about 80 tons in total, is one of the key points of the environmental protection work of companies because of the fact that the companies produce the trifluoromethane, trifluoroethane and pentafluoroethane each year due to side reactions, and the difluoromethane and tetrafluoroethane lost by separating these gases.
Various methods for treating waste fluorochlorohydrocarbons, such as a high-temperature incineration method, a plasma method, a gamma-ray irradiation method and an ultrasonic treatment method, are tried by researchers at home and abroad, wherein the high-temperature incineration method is considered as a feasible method for treating chlorofluorocarbons on a large scale, but toxic substances such as dioxin, carbon monoxide and fluorine gas are found in byproducts of incineration treatment of fluorochlorohydrocarbons; the operation cost of the plasma method is high; the gamma-ray irradiation method and the ultrasonic treatment method are unsafe.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for effectively decomposing fluorine-containing alkane substances, which is characterized in that compared with the traditional incineration method, the method adopts catalytic oxidation, thereby effectively reducing the reaction temperature and reducing the energy consumption; and the decomposition products obtained by adopting the catalytic oxidation method basically do not contain toxic substances such as carbon monoxide, fluorine gas and the like.
In order to solve the technical problems, the invention provides a method for effectively decomposing fluorine-containing alkane substances, which is characterized by comprising the following steps:
(1) Collecting the waste gas containing fluorine organic matters discharged from a workshop, wherein the waste gas mainly contains fluorine organic matters such as R134a (tetrafluoroethane), R143a (trifluoroethane), R32 (difluoromethane) and R23 (trifluoromethane);
(2) Introducing the waste gas into an electric heater for heating;
(3) After heating, introducing gas into a catalytic reactor, adding a catalyst, and carrying out catalytic oxidation on fluorine-containing waste gas to react into carbon dioxide, hydrogen fluoride and water, wherein the reaction equation is as follows:
(4) After the reaction is finished, the rapid cooling of the reacted dare gas is carried out by a quencher;
(5) The cooled gas enters an alkaline washing tower, and the purified reaction gas can be discharged outwards through a chimney.
Further, the reaction temperature in the catalytic reactor in the step 3 is 350-450 ℃.
In step 5, a sodium hydroxide solution is disposed at the bottom of the alkaline washing tower, and the acid gas such as hydrogen fluoride in the reacted gas is absorbed by the sodium hydroxide solution.
Further, the bottom wastewater generated after the acid gas is absorbed in the alkaline washing tower is introduced into a sewage station.
Further, in step 2, the exhaust gas is introduced into the electric heater while the air is introduced.
The invention has the beneficial effects that: 1: compared with the traditional incineration method, the method adopts catalytic oxidation, so that the reaction temperature is effectively reduced, and the energy consumption is reduced;
2: the decomposition products obtained by the catalytic oxidation method basically do not contain toxic substances such as carbon monoxide, fluorine gas and the like.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to FIG. 1, in one embodiment of the method of the present invention for efficiently decomposing fluorine-containing alkanes, (1) collecting the waste gas of fluorine-containing organic substances such as R134a (tetrafluoroethane), R143a (trifluoroethane), R32 (difluoromethane) and R23 (trifluoromethane) discharged from a plant;
(2) Introducing the waste gas into an electric heater for heating;
(3) After heating, introducing gas into a catalytic reactor, adding a catalyst, and carrying out catalytic oxidation on fluorine-containing waste gas to react into carbon dioxide, hydrogen fluoride and water, wherein the reaction equation is as follows:
(4) After the reaction is finished, the rapid cooling of the reacted dare gas is carried out by a quencher;
(5) The cooled gas enters an alkaline washing tower, and the purified reaction gas can be discharged outwards through a chimney.
The summary is as follows: and (3) collecting the fluorine-containing organic waste gas discharged from the workshop, and treating the waste gas in a catalytic oxidation mode. After the waste gas is heated by an electric heater, the waste gas enters a catalytic oxidation reaction system, fluorine-containing organic matters such as R134a (tetrafluoroethane), R143a (trifluoroethane), R32 (difluoromethane), R23 (trifluoromethane) and the like are oxidized and decomposed into CO2, HF and H2O under the action of a catalyst, high-temperature reaction gas is quenched and then passes through an alkaline washing tower, acid gases such as HF and the like in the reaction gas are absorbed by NaOH solution, waste water at the bottom of the alkaline washing tower is sent to a factory sewage station, purified reaction gas is discharged through a chimney, and the research of engineers shows that in the catalytic decomposition reaction process in an air mixed atmosphere, HFC (fluorochlorohydrocarbon) substances are firstly obtained under the action of the catalyst under the CO and HF, then the CO is catalyzed and oxidized into CO2 by catalyst surface active particles, and the initial conversion rate of the HFC reaches more than 95 percent when the reaction temperature is 350-450 ℃.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (5)
1. A method for effectively decomposing fluorine-containing alkane substances, which is characterized by comprising the following steps:
(1) Collecting the waste gas containing fluorine organic matters discharged from a workshop, wherein the waste gas mainly contains fluorine organic matters such as R134a (tetrafluoroethane), R143a (trifluoroethane), R32 (difluoromethane) and R23 (trifluoromethane);
(2) Introducing the waste gas into an electric heater for heating;
(3) After heating, introducing gas into a catalytic reactor, adding a catalyst, and carrying out catalytic oxidation on fluorine-containing waste gas to react into carbon dioxide, hydrogen fluoride and water, wherein the reaction equation is as follows:
(4) After the reaction is finished, the rapid cooling of the reacted dare gas is carried out by a quencher;
(5) The cooled gas enters an alkaline washing tower, and the purified reaction gas can be discharged outwards through a chimney.
2. The method for efficiently decomposing fluorine-containing alkane substance according to claim 1, wherein a reaction temperature in the catalytic reactor in the step 3 is 350 ℃ to 450 ℃.
3. The method for effectively decomposing fluorine-containing alkane as claimed in claim 1, wherein in said step 5, a sodium hydroxide solution is provided at the bottom of the alkaline washing tower, and acid gases such as hydrogen fluoride in the reacted gas are absorbed by the sodium hydroxide solution.
4. The method for effectively decomposing fluorine-containing alkane substance as defined in claim 3, wherein the bottom wastewater generated after the acid gas is absorbed in the alkaline washing tower is introduced into a sewage station.
5. The method for effectively decomposing fluorine-containing alkane substance as claimed in claim 1, wherein in step 2, the exhaust gas is introduced into the electric heater while the air is introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311747404.2A CN117732241A (en) | 2023-12-19 | 2023-12-19 | Method for effectively decomposing fluorine-containing alkane substances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311747404.2A CN117732241A (en) | 2023-12-19 | 2023-12-19 | Method for effectively decomposing fluorine-containing alkane substances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117732241A true CN117732241A (en) | 2024-03-22 |
Family
ID=90250346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311747404.2A Pending CN117732241A (en) | 2023-12-19 | 2023-12-19 | Method for effectively decomposing fluorine-containing alkane substances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117732241A (en) |
-
2023
- 2023-12-19 CN CN202311747404.2A patent/CN117732241A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100766749B1 (en) | An apparatus and method for treatment waste gas contains perfluoro compounds | |
| EP1732669B1 (en) | Method and apparatus for treating gas containing fluorine-containing compounds | |
| CN102895868B (en) | Method for catalytic hydrolysis of freon and device thereof | |
| JP4080336B2 (en) | Decomposition of fluorine-containing compounds | |
| CN105056721A (en) | Novel waste rubber desulphurization waste gas three-stage energy-saving green treatment process method | |
| CN117732241A (en) | Method for effectively decomposing fluorine-containing alkane substances | |
| AU2002226536A1 (en) | Decomposition of fluorine containing compounds | |
| CN101301570A (en) | Technique for processing purified terephthalic acid tail gas | |
| CN217163800U (en) | High temperature HF tail gas's processing system | |
| CN103058190B (en) | Harmlessness treatment method for freon | |
| CN106731563B (en) | A kind of processing method and processing device of the organic exhaust gas containing chlorine | |
| US6838065B2 (en) | Method and apparatus for treating waste gas containing PFC and/or HFC | |
| CN108057330A (en) | A kind of PTA oxidized tail gas purification and bromine retracting device and technique | |
| JP5150828B2 (en) | Activated carbon production method | |
| JP4867265B2 (en) | N2O decomposition method | |
| JP2011115795A (en) | Method and apparatus for decomposing persistent substance | |
| JP3216868B2 (en) | Decomposition method of halide gas | |
| JP4399938B2 (en) | Monochlorodifluoromethane treatment method | |
| CN106827302A (en) | The recovery and treatment method of polyurethane waste material in a kind of waste refrigerators | |
| CN113880049B (en) | Method and system for recycling hydrogen fluoride | |
| CN116947598B (en) | Method for producing tetrafluoromethane by taking trifluoromethane as raw material | |
| JPH08238418A (en) | Decomposition treatment method for organic halogen compound | |
| CN108191644A (en) | A kind of preparation method of chlorine difluoroacetic acid chloride | |
| CN110906335A (en) | Method and device for treating waste catalyst in difluoroethane production | |
| CN117531539A (en) | Tetrafluoroethane catalyst activity reduction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |