DE19805202A1 - Process for the preparation of nitric acid and device for carrying out the process - Google Patents
Process for the preparation of nitric acid and device for carrying out the processInfo
- Publication number
- DE19805202A1 DE19805202A1 DE19805202A DE19805202A DE19805202A1 DE 19805202 A1 DE19805202 A1 DE 19805202A1 DE 19805202 A DE19805202 A DE 19805202A DE 19805202 A DE19805202 A DE 19805202A DE 19805202 A1 DE19805202 A1 DE 19805202A1
- Authority
- DE
- Germany
- Prior art keywords
- catalyst
- reaction gases
- network
- nitric acid
- contained
- 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.)
- Ceased
Links
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 16
- 238000002360 preparation method Methods 0.000 title claims description 3
- 239000003054 catalyst Substances 0.000 claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 3
- 239000000919 ceramic Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000010970 precious metal Substances 0.000 claims description 2
- 229910052566 spinel group Inorganic materials 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 10
- 235000013842 nitrous oxide Nutrition 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/265—Preparation by catalytic or non-catalytic oxidation of ammonia characterised by the catalyst
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Salpetersäure, bei dem Ammoniak an mindestens einem Katalysatornetz, insbesondere Platinnetz, unter Zufuhr von Sauerstoff verbrannt wird und die Reaktionsgase gekühlt werden.The invention relates to a process for the preparation of nitric acid, in which Ammonia on at least one catalyst network, in particular platinum network, is burned with the supply of oxygen and the reaction gases are cooled become.
Die Verbrennung von NH3 an einem Katalysatornetz erfolgt bei Temperaturen
von z. B. 800 bis 1000 °C gemäß der nachfolgenden Gleichung:
The combustion of NH 3 on a catalyst network takes place at temperatures of, for. B. 800 to 1000 ° C according to the following equation:
4 NH3 + 5 O2 → 4 NO + 6 H2O (1).4 NH 3 + 5 O 2 → 4 NO + 6 H 2 O (1).
Das hierbei entstehende NO2 reagiert während und nach der Abkühlung der
Reaktionsgase auf ca. 20 bis 30°C mit Sauerstoff zu NO2:
The resulting NO 2 reacts with and to oxygen to NO 2 during and after the cooling of the reaction gases to approx. 20 to 30 ° C:
NO + ½O2 → NO2 (2).NO + ½O 2 → NO 2 (2).
Bei Kontakt mit Wasser und Sauerstoff entsteht die gewünschte Salpetersäure
HNO3:
The desired nitric acid HNO 3 is formed on contact with water and oxygen:
4 NO2 + 2 H2O + O2 → 4 HNO3 (3).4 NO 2 + 2 H 2 O + O 2 → 4 HNO 3 (3).
Es wurde gefunden, daß als Nebenreaktion bei der Katalytischen NH3-
Verbrennung zu NO nach Gleichung (1) auch unerwünschtes N2O (Lachgas)
entsteht:
It was found that undesirable N 2 O (laughing gas) also forms as a side reaction in catalytic NH 3 combustion to NO according to equation (1):
4 NH3 + 4 O2 → 2 N2O + 6 H2O (4),
4 NH 3 + 4 O 2 → 2 N 2 O + 6 H 2 O (4),
welches in den nachfolgenden Stufen der Salpetersäureherstellung nicht abgebaut wird.which is not in the subsequent stages of nitric acid production is broken down.
Es ist daher die Aufgabe der vorliegenden Erfindung, ein Verfahren anzugeben, bei dem bei der Erzeugung von Salpetersäure eine Freisetzung von Lachgas weitgehendst vermieden wird.It is therefore the object of the present invention, a method Specify the release of nitric acid of nitrous oxide is largely avoided.
Diese Aufgabe wird dadurch gelöst, daß die Reaktionsgase stromab des Katalysatornetzes vor der Kühlung über einen temperaturstabilen Katalysator für die Umwandlung des in den Reaktionsgasen enthaltenen N2O geführt werden.This object is achieved in that the reaction gases are passed downstream of the catalyst network before cooling over a temperature-stable catalyst for the conversion of the N 2 O contained in the reaction gases.
Die Umwandlung kann je nach gewähltem Katalysator
durch Zersetzung in die Elemente Stickstoff und Sauerstoff:
Depending on the catalyst selected, the conversion can be carried out by decomposing it into the elements nitrogen and oxygen:
2 N2O → 2 N2 + O2 (5)
2 N 2 O → 2 N 2 + O 2 (5)
oder durch Oxidation:
or by oxidation:
2 N2O + 3 O2 → 4 NO2 (6)
2 N 2 O + 3 O 2 → 4 NO 2 (6)
oder
or
N2O + ½ O2 → 2 NO (7)
N 2 O + ½ O 2 → 2 NO (7)
erfolgen.respectively.
Die Umwandlung durch Oxidation des N2O zu NO oder NO2 führt zu einer Umsatzsteigerung der Salpetersäureproduktion und wird daher bevorzugt.The conversion by oxidation of the N 2 O to NO or NO 2 leads to an increase in sales of the nitric acid production and is therefore preferred.
Lachgas gehört zwar zu den sogenannten endothermen Verbindungen und sollte daher schon bei Raumtemperatur in die Elemente zerfallen, jedoch erfolgt die Zersetzung aber aus kinetischen Gründen erst bei Erwärmung. Die erfindungsgemäße Verfahrensführung nutzt in vorteilhafter Weise die Wärme der Reaktionsgase unmittelbar nach der NH3-Verbrennung. Eine separate Erwärmung der Reaktionsgase für die N2O-Umwandlung ist nicht erforderlich. Es wird vorzugsweise ein hochaktiver Katalysator eingesetzt, da die Verweilzeit der Reaktionsgase nach Austritt aus dem Katalysatornetz bis Eintritt in die Wärmetauscher kurz ist, damit eine thermische Zersetzung des sich gemäß Gleichung (1) bildenden NO in seine Elemente nicht begünstigt wird. Laughing gas is one of the so-called endothermic compounds and should therefore disintegrate into the elements at room temperature, however, for kinetic reasons, the decomposition takes place only when heated. The procedure according to the invention advantageously uses the heat of the reaction gases immediately after the NH 3 combustion. A separate heating of the reaction gases for the N 2 O conversion is not necessary. A highly active catalyst is preferably used, since the residence time of the reaction gases after leaving the catalyst network until entry into the heat exchanger is short, so that thermal decomposition of the NO formed in accordance with equation (1) into its elements is not favored.
Weiterhin ist dafür Sorge zu tragen, daß der Katalysator zur N2O-Umwandlung die gleichzeitig mögliche Reaktion einer NO-Zersetzung nicht bzw. nicht nennenswert beschleunigt.Care must also be taken to ensure that the catalyst for N 2 O conversion does not accelerate the reaction of NO decomposition, or does not accelerate it appreciably.
Es ist bekannt, zur gleichmäßigen Beaufschlagung des der Abkühlung der Reaktionsgase dienenden Wärmetauschers bzw. Heizflächen die Reaktionsgase dem Katalysatornetz über eine Einrichtung zur Strömungsgleichverteilung zu führen, z. B. über eine Schüttung von Raschig- Ringen. Bei der erfindungsgemäßen Verfahrensführung kann der N2O- Umwandlungskatalysator auch in Form von Raschig-Ringen oder dergleichen ausgebildet werden, um neben der N2O-Umwandlung zugleich eine Strömungsvergleichmäßigung zu gewährleisten.It is known to conduct the reaction gases to the catalyst network via a device for uniform flow distribution, for example, in order to apply uniformly to the heat exchanger or heating surfaces used for cooling the reaction gases. B. over a bed of Raschig rings. When carrying out the process according to the invention, the N 2 O conversion catalyst can also be designed in the form of Raschig rings or the like, in order to ensure, in addition to the N 2 O conversion, a flow equalization at the same time.
Auch ist es bekannt, das Platinnetz zu seiner Abstützung auf keramischen Elementen aufliegen zu lassen. Es liegt im Rahmen der bevorzugten Erfindungsführung auch solche Abstützelemente aus einem katalytisch aktiven Material für die N2O-Umwandlung aufzubauen.It is also known to let the platinum network rest on ceramic elements for its support. It is also within the scope of the preferred embodiment of the invention to construct such support elements from a catalytically active material for the N 2 O conversion.
Es ist also zweckmäßig, daß die Reaktionsgase durch eine Schüttung von Katalysatorelementen oder über einen gasdurchlässigen Formkatalysator, wie z. B. Wabenkatalysator, geführt werden.It is therefore appropriate that the reaction gases by a bed of Catalyst elements or a gas-permeable shaped catalyst, such as e.g. B. honeycomb catalyst.
Vorzugsweise wird ein Katalysator ausgewählt aus der Gruppe: Edelmetall oder Keramik.A catalyst is preferably selected from the group: noble metal or ceramics.
Wiederum bevorzugt wird der Einsatz einer Keramik, die mit Metallen, wie z. B. V, Cr, Fe, Ni, Co, Cu, Bi, Ca, Zn, Al, Mg, und/oder deren Oxiden und/oder Edelmetallen dotiert ist. In besonders bevorzugter Weise werden Tonkeramiken, d. h. Keramiken auf Aluminiumsilikat-Basis eingesetzt, weiter bevorzugt Cordierite.Again preferred is the use of a ceramic, which with metals such. B. V, Cr, Fe, Ni, Co, Cu, Bi, Ca, Zn, Al, Mg, and / or their oxides and / or Precious metals is doped. In a particularly preferred manner Clay ceramics, d. H. Ceramics based on aluminum silicate used, further prefers cordierite.
Weiterhin ist es denkbar, als Katalysator Spinelle und/oder Perowskite einzusetzen.It is also conceivable to use spinels and / or perovskites as catalysts to use.
Bei allen eingesetzten Katalysatoren muß dafür Sorge getragen werden, daß sie der Wärmebelastung im Bereich von 800 bis 1000°C unmittelbar nach Austritt der Reaktionsgase aus dem Katalysatornetz standhalten können. With all catalysts used, care must be taken that they immediately follow the thermal load in the range of 800 to 1000 ° C Can withstand the reaction gases from the catalyst network.
Es kann entweder das reine Katalysatormaterial eingesetzt werden oder Katalysatormaterial wird auf einen ebenfalls temperaturstabilen Träger aufgebracht.Either the pure catalyst material can be used or Catalyst material is also on a temperature stable support upset.
Die Erfindung richtet sich auch auf eine Vorrichtung zur Herstellung von Salpetersäure mit einem Reaktor, mindestens einem sich quer zum Reaktorinneren erstreckenden Katalysatornetz und mindestens einer dem Katalysatornetz nachgeschalteten Heizfläche.The invention is also directed to an apparatus for producing Nitric acid with a reactor, at least one across Catalyst network extending inside the reactor and at least one of the Catalyst network downstream heating surface.
Erfindungsgemäß ist dabei vorgesehen, daß zwischen dem Katalysatornetz und der Heizfläche ein gasdurchlässiger temperaturstabiler Katalysator für die Umwandlung von in den Reaktionsgasen enthaltenem N2O angeordnet ist.It is provided according to the invention that a gas-permeable, temperature-stable catalyst for converting N 2 O contained in the reaction gases is arranged between the catalyst network and the heating surface.
Dabei ist es zweckmäßig, wenn der Katalysator gleichzeitig der Strömungsgleichverteilung dient bzw. das Katalysatornetz für die NH3- Verbrennung abstützt.In this case, it is expedient if the catalyst simultaneously serves for uniform flow distribution or supports the catalyst network for NH 3 combustion.
Eine erfindungsgemäße Vorrichtung soll nun anhand der beigefügten Figuren näher erläutert werden.A device according to the invention will now be described with reference to the accompanying figures are explained in more detail.
In den Reaktor 1 wird über eine Zuleitung 2 eine Mischung aus NH3 und sauerstoffhaltiger Luft O2 eingeleitet. Die Zuleitung 2 mit relativ geringem Querschnitt geht in eine Haube 3 größeren Querschnittes über, an die sich ein zylindrischer Behältergrundkörper 4 anschließt. Quer über die Eintrittsöffnung des Grundkörpers 4 erstrecken sich Platinnetze 5, die gegebenenfalls noch abgestützt sind. Unmittelbar nach den Platinnetzen ist ein Katalysatoreinbau 6 für die N2O-Umwandlung angeordnet, der aus einer Schüttung von katalytisch aktiven Raschig-Ringen 6a und einem die Schüttung tragenden Lochblech 6b besteht. Die aus dem Katalysatoreinbau 6 austretenden Reaktionsgase R treten in einen nur schematisch dargestellten Kühlflächeneinbau 7 ein, der von einem Kühlmittel K durchströmt wird. Die Reaktionsgase werden über einen Auslaß 8 abgezogen.A mixture of NH 3 and oxygen-containing air O 2 is introduced into the reactor 1 via a feed line 2 . The feed line 2 with a relatively small cross section merges into a hood 3 with a larger cross section, to which a cylindrical container base body 4 is connected. Platinum nets 5 extend across the inlet opening of the base body 4 and are optionally still supported. Immediately after the platinum networks, a catalyst installation 6 for the N 2 O conversion is arranged, which consists of a bed of catalytically active Raschig rings 6 a and a perforated plate 6 b carrying the bed. The reaction gases R emerging from the catalyst installation 6 enter a cooling surface installation 7 , which is shown only schematically and through which a coolant K flows. The reaction gases are withdrawn via an outlet 8 .
Claims (13)
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19805202A DE19805202A1 (en) | 1997-08-12 | 1998-02-10 | Process for the preparation of nitric acid and device for carrying out the process |
| EP98946323A EP1001910B1 (en) | 1997-08-12 | 1998-08-11 | Method for producing nitric acid and device for carrying out said method |
| PCT/EP1998/005126 WO1999007638A1 (en) | 1997-08-12 | 1998-08-11 | Method for producing nitric acid and device for carrying out said method |
| US09/485,399 US6534029B1 (en) | 1997-08-12 | 1998-08-11 | Method and apparatus for producing nitric oxide |
| AU93417/98A AU9341798A (en) | 1997-08-12 | 1998-08-11 | Method for producing nitric acid and device for carrying out said method |
| DE59811293T DE59811293D1 (en) | 1997-08-12 | 1998-08-11 | METHOD FOR PRODUCING NITRIC ACID AND DEVICE FOR IMPLEMENTING THE METHOD |
| DE19881244T DE19881244D2 (en) | 1997-08-12 | 1998-08-11 | Process for the preparation of nitric acid and device for carrying out the process |
| AT98946323T ATE265391T1 (en) | 1997-08-12 | 1998-08-11 | METHOD FOR PRODUCING NITRIC ACID AND DEVICE FOR CARRYING OUT THE METHOD |
| ES98946323T ES2219906T3 (en) | 1997-08-12 | 1998-08-11 | PROCEDURE FOR OBTAINING NITRIC ACID AND DEVICE FOR PUTTING INTO PRACTICE OF THE PROCEDURE. |
| CA002300445A CA2300445A1 (en) | 1997-08-12 | 1998-08-11 | Method for producing nitric acid and device for carrying out said method |
| DK98946323T DK1001910T3 (en) | 1997-08-12 | 1998-08-11 | Process for producing nitric acid and device for carrying out the process |
| NO20000691A NO20000691L (en) | 1997-08-12 | 2000-02-11 | Process for the production of nitric acid and apparatus for carrying out the process |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19734757 | 1997-08-12 | ||
| DE19805202A DE19805202A1 (en) | 1997-08-12 | 1998-02-10 | Process for the preparation of nitric acid and device for carrying out the process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19805202A1 true DE19805202A1 (en) | 1999-02-18 |
Family
ID=7838644
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19805202A Ceased DE19805202A1 (en) | 1997-08-12 | 1998-02-10 | Process for the preparation of nitric acid and device for carrying out the process |
| DE59811293T Revoked DE59811293D1 (en) | 1997-08-12 | 1998-08-11 | METHOD FOR PRODUCING NITRIC ACID AND DEVICE FOR IMPLEMENTING THE METHOD |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE59811293T Revoked DE59811293D1 (en) | 1997-08-12 | 1998-08-11 | METHOD FOR PRODUCING NITRIC ACID AND DEVICE FOR IMPLEMENTING THE METHOD |
Country Status (1)
| Country | Link |
|---|---|
| DE (2) | DE19805202A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999055621A1 (en) * | 1998-04-27 | 1999-11-04 | Basf Aktiengesellschaft | Method for the catalytic decomposition of n2o |
| WO2001051415A1 (en) * | 2000-01-14 | 2001-07-19 | Krupp Uhde Gmbh | Removal of laughing gas in nitric acid production |
| US6649134B2 (en) | 2000-05-15 | 2003-11-18 | W. C. Heraeus Gmbh & Co. Kg | Method and apparatus for reducing nitrous oxide |
| RU2248935C1 (en) * | 2003-08-21 | 2005-03-27 | Уральский государственный университет путей сообщения | Ammonia oxidation reactor catalyst |
| WO2005042403A3 (en) * | 2003-10-29 | 2006-03-02 | Basf Ag | Method for eliminating n2o during nitric acid production |
| US7364711B2 (en) | 2003-06-23 | 2008-04-29 | Basf Aktiengesellschaft | Method for removing N2O during the production of nitric acid |
-
1998
- 1998-02-10 DE DE19805202A patent/DE19805202A1/en not_active Ceased
- 1998-08-11 DE DE59811293T patent/DE59811293D1/en not_active Revoked
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999055621A1 (en) * | 1998-04-27 | 1999-11-04 | Basf Aktiengesellschaft | Method for the catalytic decomposition of n2o |
| US6743404B1 (en) | 1998-04-27 | 2004-06-01 | Basf Aktiengesellschaft | Method for the catalytic decomposition of N2O |
| WO2001051415A1 (en) * | 2000-01-14 | 2001-07-19 | Krupp Uhde Gmbh | Removal of laughing gas in nitric acid production |
| AU775254B2 (en) * | 2000-01-14 | 2004-07-22 | Thyssenkrupp Uhde Gmbh | Removal of laughing gas in nitric acid production |
| RU2237010C2 (en) * | 2000-01-14 | 2004-09-27 | Уде Гмбх | Removing laughing gas in manufacture of nitric acid |
| US7906091B2 (en) | 2000-01-14 | 2011-03-15 | Uhde Gmbh | Removal of laughing gas in nitric acid production |
| US6649134B2 (en) | 2000-05-15 | 2003-11-18 | W. C. Heraeus Gmbh & Co. Kg | Method and apparatus for reducing nitrous oxide |
| US7364711B2 (en) | 2003-06-23 | 2008-04-29 | Basf Aktiengesellschaft | Method for removing N2O during the production of nitric acid |
| RU2248935C1 (en) * | 2003-08-21 | 2005-03-27 | Уральский государственный университет путей сообщения | Ammonia oxidation reactor catalyst |
| WO2005042403A3 (en) * | 2003-10-29 | 2006-03-02 | Basf Ag | Method for eliminating n2o during nitric acid production |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59811293D1 (en) | 2004-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8127 | New person/name/address of the applicant |
Owner name: BASF AG, 67063 LUDWIGSHAFEN, DE |
|
| 8131 | Rejection |