DE810503C - Process for the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxide - Google Patents
Process for the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxideInfo
- Publication number
- DE810503C DE810503C DEP26429D DEP0026429D DE810503C DE 810503 C DE810503 C DE 810503C DE P26429 D DEP26429 D DE P26429D DE P0026429 D DEP0026429 D DE P0026429D DE 810503 C DE810503 C DE 810503C
- Authority
- DE
- Germany
- Prior art keywords
- carbon monoxide
- monoxide
- gas mixture
- nitrogen
- separation
- 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
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 23
- 229910002091 carbon monoxide Inorganic materials 0.000 title claims description 22
- 239000000203 mixture Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 5
- 239000007789 gas Substances 0.000 title description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title description 12
- 238000000926 separation method Methods 0.000 title description 3
- 239000003054 catalyst Substances 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical class [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- 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
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0411—Chemical processing only
- C01B21/0416—Chemical processing only by oxidation
-
- 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)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B23/00—Noble gases; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/025—Preparation or purification of gas mixtures for ammonia synthesis
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
- C01B3/56—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids
- C01B3/58—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids including a catalytic reaction
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B5/00—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0045—Oxygen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/005—Carbon monoxide
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- Catalysts (AREA)
- Treating Waste Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
(WiGBl. S. 175)(WiGBl. P. 175)
AUSGEGEBEN AM 9. AUGUST 1951ISSUED AUGUST 9, 1951
p 26429 IVb 112 e Dp 26429 IVb 112 e D
Das Verfahren gemäß der vorliegenden Erfindung betrifft die Abtrennung von Kohlenmonoxyd aus einem kohlenmonoxyd- und stickstoffmonoxydenthaltenden Gasgemisch.The method according to the present invention relates to the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxide.
Es ist bekannt, daß man Kohlenmonoxyd aus einem Gasgemisch abtrennen kann, indem man es, gegebenenfalls unter Druck, mittels einer sauren oder ammoniakalischen Kuprosalzlösung absorbiert. In diesem Fall muß man aber wegen der Reduktion zu Stickstoff mit erheblichen Stickstoffmonoxydverlusten rechnen.It is known that carbon monoxide can be separated from a gas mixture by possibly absorbed under pressure by means of an acidic or ammoniacal cupro salt solution. In this case, however, because of the reduction to nitrogen, there is considerable loss of nitrogen monoxide calculate.
Die gleichfalls bekannte Methode zur Umwandlung von Kohlenmonoxyd in Kohlendioxyd mittels Dampf erfordert Gasgemische mit einer ziemlich großen Wasserstoffpartialspannung, weil die dabei erforderlichen Konversionskatalysatoren (vgl. die diesbezüglichen Patentschriften in J. Schmidt, Das Kohlenoxyd, Leipzig 1935, S. 59 bis 60) nur in diesem Fall wirksam sind, und dieser Methode haftet außerdem der Nachteil an, daß nicht nur das Kohlenmonoxyd, sondern auch das Stickstoffmonoxyd oxydiert wird.The also known method for converting carbon monoxide into carbon dioxide by means of Steam requires gas mixtures with a fairly large hydrogen partial tension, because of this necessary conversion catalysts (cf. the relevant patents in J. Schmidt, Das Kohlenoxyd, Leipzig 1935, pp. 59 to 60) are only effective in this case, and this method adheres also the disadvantage that not only carbon monoxide but also nitrogen monoxide is oxidized.
Schließlich könnte man das Gasgemisch von dem Kohlenmonoxyd dadurch befreien, daß man es, gegebenenfalls nach der Abtrennung des etwa anwesenden Kohlendioxyds, auf hohe Temperatur bringt, um auf diese Weise die Umwandlung gemäß der ReaktionsgleichungFinally, one could free the gas mixture from the carbon monoxide by doing it, if necessary after the separation of any carbon dioxide that may be present, bring it to a high temperature in order to carry out the conversion in accordance with the reaction equation
2 CO+ 2 NO > 2 CO + 2 NO >
zu bewerkstelligen. Dato accomplish. There
2 CO2 +N2
d2 CO 2 + N 2
d
2 2
aber aus den Unter- 2 2
but from the
suchungen von Musgrave und Hinabelwood (vgl. J. Chem. Soc. 1933, S. 56 bis 59) bekannt ist, daß diese Reaktion erst bei etwa 9000 C mit meßbarer Geschwindigkeit verläuft, müßte man zur Erzielung einer passenden Reaktionsgeschwindigkeit das Gasgemisch auf Temperaturen über iooo0 C erhitzen.investigations of Musgrave and descending Elwood (see. J. Chem. Soc. 1933, p 56 to 59) is known that this reaction proceeds only at about 900 0 C at a measurable rate, one would have to achieve a suitable rate of reaction, the gas mixture to temperatures iooo heat above 0 C.
Es wurde nun gefunden, daß die obenerwähnte Reaktion auch bei niedrigeren Temperaturen rasch verläuft, wenn man einen Oxydationskatalysator benutzt. Bei einer hinreichenden Kontaktdauer zwischen dem Gasgemisch und Katalysatormasse sind dann Temperaturen von 350 bis 8oo° C hinreichend, um nahezu .alles anwesende Kohlenmon-It has now been found that the above-mentioned reaction is rapid even at lower temperatures runs if you use an oxidation catalyst. With a sufficient duration of contact Temperatures of 350 to 8oo ° C are then sufficient between the gas mixture and the catalyst mass, to remove almost all of the carbon mono-
'15 oxyd in Kohlendioxyd zu verwandeln.'15 to convert oxide into carbon dioxide.
Gemäß der Erfindung wird also aus einem Gasgemisch, das neben Kohlenmonoxyd auch Stickstoff monoxyd enthält, Kohlenmonoxyd in der Weise abgetrennt, daß man das Gemisch bei einer Tem-According to the invention, a gas mixture which, in addition to carbon monoxide, also becomes nitrogen contains monoxide, carbon monoxide is separated in such a way that the mixture is
ao peratur von wenigstens 3500 C über einen Oxydationskatalysator führt.ao temperature of at least 350 0 C leads over an oxidation catalyst.
Ein Gasgemisch, das neben Stickstoffmonoxyd, as Kohlendioxyd und Stickstoff 7,0% Kohlenmonoxyd enthielt, wurde durch eine Reaktionsröhre geleitet, in der sich eine Platinkontaktmasse befand, die auf einer Temperatur von 5500 C gehalten wurde.A gas mixture containing in addition to nitrogen monoxide, carbon dioxide and nitrogen as 7.0% carbon monoxide was passed through a reaction tube in which a platinum catalyst composition was located, which was maintained at a temperature of 550 0 C.
Das austretende Gasgemisch enthielt nur 0,4% Kohlenmonoxyd.The escaping gas mixture contained only 0.4% carbon monoxide.
Wenn man die Temperatur der Kontaktmasse erhöht, kann der endgültige Kohlenmonoxydgehalt
bis zu 0,1 bis 0,2% herabgedrückt werden.
Umgekehrt steigt dieser Gehalt, wenn man bei niedrigeren Temperaturen arbeitet. Ausgehend von
einem Kohlenmonoxydgehalt von 7,0% zeigte das Endgas bei einer Reaktionstemperatur von 4500 C
einen Kohlenmonoxydgehalt von 1,4%, während bei 3500 C der Kohlenmonoxydgehalt im Endgas
schon 6,5 % betrug.By increasing the temperature of the contact mass, the final carbon monoxide content can be suppressed as much as 0.1-0.2%.
Conversely, this content increases when you work at lower temperatures. Starting from a carbon monoxide content of 7.0% showed the tail gas at a reaction temperature of 450 0 C a carbon monoxide content of 1.4%, while at 350 0 C, the carbon monoxide content in the tail gas was already 6.5%.
Ein Gemisch von Stickstoffmonoxyd, Kohlenmonoxyd und Kohlendioxyd mit einem Kohlenmonoxydgehalt von 8,9 °/o wurde durch eine vanadiumkatalysatorenthaltende (11,3% V2O5, 2,3% Sn O2) Röhre geführt.A mixture of nitrogen monoxide, carbon monoxide and carbon dioxide with a carbon monoxide content of 8.9% was passed through a tube containing vanadium catalyst (11.3% V 2 O 5 , 2.3% Sn O 2 ).
Bei einer Reaktionstemperatur von 6500 C betrug der Kohlenmonoxydgehalt im Endgas 5,2%, während bei einer Temperatur von 7800 C das austretende Gas nahezu kohlenmonoxydfrei war.At a reaction temperature of 650 0 C, the carbon monoxide content was 5.2% in the tail gas, while at a temperature of 780 0 C the exit gas was almost kohlenmonoxydfrei.
Das gleiche Gasgemisch wie im Beispiel 2 (8,9% CO) wurde durch eine katalysatorenthaltende (Gemisch von Fe3O4, Al2O3 und K2O) Röhre geführt.The same gas mixture as in Example 2 (8.9% CO) was passed through a tube containing a catalyst (mixture of Fe 3 O 4 , Al 2 O 3 and K 2 O).
Bei einer Reaktionstemperatur von 7500 C wurde nahezu alles Kohlenmonoxyd in Kohlendioxyd umgewandelt. At a reaction temperature of 750 ° C., almost all of the carbon monoxide was converted into carbon dioxide.
Während bei der vorliegenden Umwandlung also jeder Oxydationskatalysator Anwendung finden kann (Metalle, Metalloxyde, Gemische von Metallen und/oder Metälloxyden, Vanadate, Chromite, Molybdate, gegebenenfalls auf Träger aufgezogen und mit Promotoren vermischt), weisen die Katalysatoren der Platingruppe bei den niedrigeren Temperaturen die größte Wirksamkeit auf.While every oxidation catalyst is used in the present transformation can (metals, metal oxides, mixtures of metals and / or metal oxides, vanadates, chromites, Molybdates, if appropriate drawn onto a carrier and mixed with promoters), have the catalysts The platinum group is most effective at the lower temperatures.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL814142X | 1947-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE810503C true DE810503C (en) | 1951-08-09 |
Family
ID=19838807
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP26432A Expired DE818641C (en) | 1947-05-21 | 1948-12-24 | Process for the production of nitrogen monoxide by reducing nitric acid with sulfur dioxide |
| DEP26431A Expired DE814142C (en) | 1947-05-21 | 1948-12-24 | Process for the production of nitric oxide by reducing nitric acid with carbon |
| DEP26429D Expired DE810503C (en) | 1947-05-21 | 1948-12-24 | Process for the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxide |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP26432A Expired DE818641C (en) | 1947-05-21 | 1948-12-24 | Process for the production of nitrogen monoxide by reducing nitric acid with sulfur dioxide |
| DEP26431A Expired DE814142C (en) | 1947-05-21 | 1948-12-24 | Process for the production of nitric oxide by reducing nitric acid with carbon |
Country Status (3)
| Country | Link |
|---|---|
| BE (2) | BE487705A (en) |
| DE (3) | DE818641C (en) |
| NL (2) | NL65075C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976745A (en) * | 1973-12-12 | 1976-08-24 | Mitsubishi Petrochemical Company Limited | Process for reducing nitrogen oxides to nitrogen |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5670127A (en) * | 1995-09-26 | 1997-09-23 | The Boc Group, Inc. | Process for the manufacture of nitric oxide |
| DE19953775A1 (en) | 1999-11-09 | 2001-05-10 | Bayer Ag | Active ingredient combinations with insecticidal and acaricidal properties |
| DE10015310A1 (en) | 2000-03-28 | 2001-10-04 | Bayer Ag | Active ingredient combinations with insecticidal and acaricidal properties |
| DE10042736A1 (en) | 2000-08-31 | 2002-03-14 | Bayer Ag | Active ingredient combinations with insecticidal and acaricidal properties |
| DE102007045955A1 (en) | 2007-09-26 | 2009-04-09 | Bayer Cropscience Ag | Active agent combination, useful e.g. for combating animal pests and treating seeds of transgenic plants, comprises substituted amino-furan-2-one compound and at least one compound e.g. diazinon, isoxathion, carbofuran or aldicarb |
| BRPI0924451B1 (en) | 2009-03-25 | 2017-12-26 | Bayer Intellectual Property Gmbh | Combinations of active substances and their uses, as well as methods for the control of animal pests and method for the manufacture of insecticides and acaricides |
-
0
- BE BE487706D patent/BE487706A/xx unknown
- NL NL65076D patent/NL65076C/xx active
- BE BE487705D patent/BE487705A/xx unknown
- NL NL65075D patent/NL65075C/xx active
-
1948
- 1948-12-24 DE DEP26432A patent/DE818641C/en not_active Expired
- 1948-12-24 DE DEP26431A patent/DE814142C/en not_active Expired
- 1948-12-24 DE DEP26429D patent/DE810503C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976745A (en) * | 1973-12-12 | 1976-08-24 | Mitsubishi Petrochemical Company Limited | Process for reducing nitrogen oxides to nitrogen |
Also Published As
| Publication number | Publication date |
|---|---|
| DE814142C (en) | 1951-09-20 |
| NL65075C (en) | |
| NL65076C (en) | |
| DE818641C (en) | 1951-10-25 |
| BE487706A (en) | |
| BE487705A (en) |
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