EP1106714B1 - Verfahren zur Herstellung von Halogenen durch Gasphasenelektrolyse - Google Patents
Verfahren zur Herstellung von Halogenen durch Gasphasenelektrolyse Download PDFInfo
- Publication number
- EP1106714B1 EP1106714B1 EP00126503A EP00126503A EP1106714B1 EP 1106714 B1 EP1106714 B1 EP 1106714B1 EP 00126503 A EP00126503 A EP 00126503A EP 00126503 A EP00126503 A EP 00126503A EP 1106714 B1 EP1106714 B1 EP 1106714B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- hydrogen halide
- halogen
- gas phase
- electrolysis
- 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.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
Definitions
- the present invention relates to a process for the production of chlorine by Gas phase electrolysis.
- gas diffusion electrodes are used as the anode in the gas-phase electrolysis of HCl.
- these gas diffusion electrodes are separated from the catholyte or the cathode by a solid electrolyte, in particular a polymeric solid electrolyte, such as Nafion membranes.
- a solid electrolyte in particular a polymeric solid electrolyte, such as Nafion membranes.
- ceramic or liquid electrolytes for example concentrated H 3 PO 4 .
- the gas diffusion electrodes often contain a carbon black-supported finely divided catalyst, such as platinum on Vulcan carbon blacks. Further, as the catalyst materials RuO 2 or other noble metal oxides are used on carbon black carriers.
- the gas diffusion electrodes may also be uncatalyzed, ie contain only carbon black as an electron-conducting and electrochemically active substrate.
- the gas diffusion electrodes are highly porous and thus have a very large surface area. This surface is opened up electrochemically by impregnation with a suitable electrolyte. It must be ensured that there is no clogging of the pore system of the electrode.
- the usually used membrane has a sufficient ionic conductivity only at an increased water content, so that a sufficient humidification of the membrane is generally necessary.
- moistening with water it is also possible to impregnate the membrane with H 3 PO 4 .
- the moistening can also be carried out with water formed at the cathode during the oxygen reduction.
- external humidification is preferred because it is controllable and precisely adjustable so that substantially no excess water is in the system.
- the membrane used is usually a Nafion membrane.
- the humidification of the membrane for example, by loading the Reaction gases happen with water vapor.
- the counter electrode to the gas diffusion electrode can be an oxygen-consuming or use hydrogen-developing cathode.
- a hydrogen-developing cathode used, since it is not possible disturbing water is formed.
- the electrode / electrolyte / electrode unit is in one with gas channels and Pantographs provided electrolysis cell block or in the case of a Series arrangement in bipolar design in an electrolytic cell stack built-in.
- gas phase electrolysis when in a process in which HCl is obtained as a by-product in gaseous form is, as it is known for example from WO 97/24320.
- processes for the preparation of acid chlorides or isocyanates using phosgene which in turn is made from chlorine and carbon monoxide becomes.
- the recovered chlorine gas can be redone be used for the synthesis of phosgene.
- An object of the present invention was now to provide a method and a Apparatus for producing halogen gas from a corresponding gaseous hydrogen halide by gas phase electrolysis to provide, by means of which at the same energy use to a higher yield Halogen gas is achieved or at the same yield of the specific Energy input is lowered.
- a process for the preparation of at least a halogen gas using a corresponding gaseous Wasser Stammhalogenids comprising a gas phase electrolysis provided, wherein the corresponding gaseous hydrogen halide a free Oxygen-containing gas is added.
- the gaseous hydrogen halide is selected from the Group consisting of: hydrogen fluoride, hydrogen chloride, hydrogen bromide, Hydrogen iodide.
- hydrogen chloride for Production of chlorine gas.
- the chlorine gas thus produced is preferably used for Production of phosgene used.
- the produced Phosgene used for the preparation of acid chlorides and / or of isocyanates, wherein the by-produced hydrogen chloride again as Starting material is used for the inventive method. It results thus an effective closed reaction cycle.
- the method is used for the free oxygen containing gas air.
- air is often the easiest and least expensive.
- HC1 gas By adding oxygen to the gaseous hydrogen halide, In particular to HC1 gas surprisingly shows a significant improvement in Current-voltage characteristic of the gas-phase electrolysis described above. This means that at a lower energy input an equal space-time yield, or with the same energy input, a higher yield of halogen gas, especially chlorine, can be achieved.
- the process is in a process in which Hydrogen halide, in particular HCl gaseous by-produced, involved.
- the process is incorporated in a process for the preparation of acid chlorides and / or isocyanants by means of phosgene, which in turn made of chlorine and carbon monoxide, incorporated.
- phosgene which in turn made of chlorine and carbon monoxide, incorporated.
- the former processes dry HCl as a by-product.
- To the Use in the process according to the invention must be of organic Compounds are freed, preferably by means of an activated carbon treatment.
- the recovered or recovered chlorine gas is the Synthesis of phosgene used.
- a further advantage of the method according to the invention is the fact that the tolerance of the electrode catalysts to organic contaminants is increased by the addition of a gas having free oxygen and thus prolongs the service life of the electrodes. This is particularly advantageous since, as already mentioned, HCl is used, which may be contaminated with small amounts of organic constituents. These are oxidized by the added oxygen at elevated anodic potentials to CO 2 or other volatile oxygenates, desorbed from the electrode and can no longer block or poison the electrocatalyst.
- HCI gas phase electrolysis is without Oxygen metering to the anode gas as a comparative example and a HCl gas phase electrolysis with oxygen dosing to the anode gas as an example of an inventive method listed.
- Figure 1 shows the corresponding Current-voltage characteristics of electrolysis.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Claims (6)
- Verfahren zur Herstellung von mindestens einem Halogengas unter Einsatz eines entsprechenden gasförmigen Wasserstoffhalogenids umfassend eine Gasphasenelektrolyse,
dadurch gekennzeichnet, daß
dem entsprechenden gasförmigen Wasserstoffhalogenid ein freien Sauerstoff aufweisendes Gas zugegeben wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das gasförmige Wasserstoffhalogenid gewählt ist aus der Gruppe, bestehend aus: Fluorwasserstoff, Chlorwasserstoff, Bromwasserstoff, Iodwasserstoff.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das freien Sauerstoff aufweisende Gas Luft ist.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das eingesetzte gasförmige Wasserstoffhalogenid aus einem bei einem anderen unabhängigen chemischen Prozeß entstehenden Nebenprodukt gewinnbar ist.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß das hergestellte Halogengas direkt oder indirekt wieder dem anderen unabhängigen chemischen Prozeß zugeführt wird.
- Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der andere unabhängige chemische Prozeß die Herstellung von Säurechloriden und/oder Isocyanaten mittels Phosgen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19959683A DE19959683A1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Herstellung von Halogenen durch Gasphasenelektrolyse |
DE19959683 | 1999-12-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1106714A1 EP1106714A1 (de) | 2001-06-13 |
EP1106714B1 true EP1106714B1 (de) | 2005-03-16 |
Family
ID=7932209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00126503A Expired - Lifetime EP1106714B1 (de) | 1999-12-10 | 2000-12-08 | Verfahren zur Herstellung von Halogenen durch Gasphasenelektrolyse |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1106714B1 (de) |
AT (1) | ATE291109T1 (de) |
DE (2) | DE19959683A1 (de) |
ES (1) | ES2238245T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109468658B (zh) * | 2018-12-11 | 2020-10-30 | 浙江巨圣氟化学有限公司 | 一种碳酰氟的制备方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5853074B2 (ja) * | 1981-10-21 | 1983-11-26 | 工業技術院長 | 電解水素の製造法 |
WO1997024473A1 (en) * | 1995-12-28 | 1997-07-10 | E.I. Du Pont De Nemours And Company | Production of carbonyl halide |
IN192223B (de) * | 1995-12-28 | 2004-03-20 | Du Pont |
-
1999
- 1999-12-10 DE DE19959683A patent/DE19959683A1/de not_active Withdrawn
-
2000
- 2000-12-08 EP EP00126503A patent/EP1106714B1/de not_active Expired - Lifetime
- 2000-12-08 DE DE50009777T patent/DE50009777D1/de not_active Expired - Lifetime
- 2000-12-08 ES ES00126503T patent/ES2238245T3/es not_active Expired - Lifetime
- 2000-12-08 AT AT00126503T patent/ATE291109T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP1106714A1 (de) | 2001-06-13 |
ES2238245T3 (es) | 2005-09-01 |
DE50009777D1 (de) | 2005-04-21 |
ATE291109T1 (de) | 2005-04-15 |
DE19959683A1 (de) | 2001-06-13 |
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