DE2103265A1 - 2,4-and 2,6-tolylenediamines prepn - Google Patents
2,4-and 2,6-tolylenediamines prepnInfo
- Publication number
- DE2103265A1 DE2103265A1 DE19712103265 DE2103265A DE2103265A1 DE 2103265 A1 DE2103265 A1 DE 2103265A1 DE 19712103265 DE19712103265 DE 19712103265 DE 2103265 A DE2103265 A DE 2103265A DE 2103265 A1 DE2103265 A1 DE 2103265A1
- Authority
- DE
- Germany
- Prior art keywords
- tolylenediamines
- dinitrotoluene
- synthesis gas
- tolylenediamine
- toluene
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/30—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds
- C07C209/32—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups
- C07C209/36—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing gases and a catalyst
Abstract
Description
Verfahren zur Herstellung von 2.4- und 2.6-Toluylendiamin Die Erfindung betrifft ein Verfahren zur Herstellung von 2,4- und 2,6-Toluylendiamin durch katalytische Reduktion von 2,4- und 2,6-Dinitrotoluol. Process for the preparation of 2,4- and 2,6-tolylenediamine The invention relates to a process for the preparation of 2,4- and 2,6-tolylenediamine by catalytic Reduction of 2,4- and 2,6-dinitrotoluene.
Verfahren zur Herstellung von 2,4- und 2,6-Toluylendiamin durch Reduktion des Dinitrotoluols mittels 50% Wasserstoff enthaltender Gase, wie zum Beispiel Wassergas, bei Temperaturen zwischen 700 und 150 C und einem Druck von 5 bis 500 Atmosphären in Gegenwart von Kupfer, Kobalt oder Nickel enthaltenden Katalysatoren, sind bereits bekannt.Process for the preparation of 2,4- and 2,6-tolylenediamine by reduction of dinitrotoluene by means of gases containing 50% hydrogen, such as water gas, at temperatures between 700 and 150 C and a pressure of 5 to 500 atmospheres in the presence of copper, cobalt or nickel-containing catalysts are already known.
Diese Verfahren weisen insbesondere den Nachteil auf, daß die Ausbeuten bis zu 85) niedrig sind.These processes have the particular disadvantage that the yields up to 85) are low.
Das erfindungsgemäße Verfahren beseitigt diesen Nachteil dadurch, daß die Synthese des 2,4- und 2,6-Toluylendiamins durch Reduktion des 2,4-und 2,6-Dinitrotoluols mit frischem Ammoniaksynthesegas oder Purgiergas in Gegenwart eines Raney-Kupfer-Katalysators bei einer Temperatur von 15d0 und Druck von 50 Atmosphären, unter Verwendung von Toluol als Lösungsmittel, ausgeführt wird.The method according to the invention eliminates this disadvantage in that that the synthesis of 2,4- and 2,6-toluenediamine by reduction of 2,4- and 2,6-dinitrotoluene with fresh ammonia synthesis gas or purge gas in the presence of a Raney copper catalyst at a temperature of 15d0 and pressure of 50 atmospheres, using Toluene as a solvent.
Weitere Merkmale und Vorteile des erfindungsgemäßen Verfahrens ergeben sich aus den folgenden drei Ausfuhrungsbeispielen.Further features and advantages of the method according to the invention result themselves from the following three exemplary embodiments.
i) In ein Reaktionsgefäß wird eine ziege Lösung, die ein Gemisch aus 20% zurückgeführtem Toluylendiamin und 80% Dinitrotoluol und 2% Katalysator enthält, zusammen mit dem Synthesegas (75% H2, 25% N2) bei 150 C und 50 Atmosphären eingeführt.i) In a reaction vessel is a goat solution, which is a mixture of Contains 20% recycled toluenediamine and 80% dinitrotoluene and 2% catalyst, introduced together with the synthesis gas (75% H2, 25% N2) at 150 C and 50 atmospheres.
Der Überschuß an Synthesegas wird zurückgeführt. Ein Teil des ungetrennten Reaktionsproduktes wird in den Kreislauf eingeführt und der andere Teil filtriert und z + estillationskolonne geleitet, wo das Toluol-Wasser-Azeotrop entfernt wird. Das rohe Toluylendiamin wird im Vakuum (10 mm Hg) destilliert. Das vom Wasser getrennte Toluol wird in den Kreislauf zuruckgeführt. Die Ausbeute an Toluylendiamin beträgt 96%.The excess synthesis gas is recycled. Part of the unseparated The reaction product is introduced into the circuit and the other part is filtered and passed z + estillation column, where the toluene-water azeotrope is removed. The crude toluenediamine is distilled in vacuo (10 mm Hg). The one separated from the water Toluene is returned to the cycle. The yield of tolylenediamine is 96%.
2) In das Reaktionsgefäß wird dieselbe Lösung wie in Beispiel 1, aber mit 4% Katalysator, eingefuhrt und es wird unter denselben Betriebsbedingungen gearbeitet. Nach Trennung des Katalysators durch Filtration wird das Reaktionsprodukt durch azeotrope Destillation zur Entfernung des Wassers und durch Vakuumdestillation zur Erzeugung des reinen Toluylendiamins aufgearbeitet. Ausbeute an Toluylendiamin 98984.2) The same solution as in Example 1, but with 4% catalyst, introduced and it is carried out under the same operating conditions. After separating the catalyst by filtration, the reaction product passes through azeotropic distillation to remove the water and vacuum distillation to Production of pure toluenediamine worked up. Yield of tolylenediamine 98984.
3) In das Reaktionsgefäß wird eine 4o%ige Lösung, die ein Gemisch aus 20 zuräckgefuhrtem Toluylendiamin und 80% Dinitrotoluol in Toluol, und 2% Katalysator enthält, zusammen mit einem Reduktionsgas, das aus 60% Wasserstoff und 40% Stickstoff besteht, bei 50 Atmosphären und 150 C eingeführt.3) In the reaction vessel is a 4o% solution, which is a mixture from 20 back-fed toluene diamine and 80% dinitrotoluene in toluene, and 2% catalyst contains, together with a reducing gas, which consists of 60% hydrogen and 40% nitrogen is introduced at 50 atmospheres and 150 C.
Der Überschuß an Reduktionsgas sowie 10-20% des Reaktionsproduktes werden in den Kreislauf zurückgefürht, der Rest wird wie in Beispiel 1 aufgearbeitet. Ausbeute an Toluylendiamin 97%.The excess of reducing gas and 10-20% of the reaction product are returned to the cycle, the remainder is worked up as in Example 1. Tolylenediamine yield 97%.
Das erfindungsgemäße Verfahren weist Vorteile insbesondere dadurch auf, daß höhere Ausbeuten und weitgehende Kostenersparnisse durch Verwendung des frischen Ammoniaksynthesegases oder des Purgiergases erzielt werden.The method according to the invention has advantages in particular because of this on that higher yields and substantial cost savings by using the fresh ammonia synthesis gas or the purge gas can be achieved.
Literatur: - - Patentschrift 1.o85.165 Rumänische Patentschrift 49.135Literature: - - Patent 1.o85.165 Romanian patent 49.135
Claims (2)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712103265 DE2103265A1 (en) | 1971-01-25 | 1971-01-25 | 2,4-and 2,6-tolylenediamines prepn |
BE762059A BE762059A (en) | 1968-12-27 | 1971-01-26 | 2,4-and 2,6-tolylenediamines prepn |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712103265 DE2103265A1 (en) | 1971-01-25 | 1971-01-25 | 2,4-and 2,6-tolylenediamines prepn |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2103265A1 true DE2103265A1 (en) | 1972-08-17 |
Family
ID=5796793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19712103265 Pending DE2103265A1 (en) | 1968-12-27 | 1971-01-25 | 2,4-and 2,6-tolylenediamines prepn |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2103265A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002000598A2 (en) * | 2000-06-29 | 2002-01-03 | Dow Global Technologies Inc. | Process for the production of aromatic amines |
-
1971
- 1971-01-25 DE DE19712103265 patent/DE2103265A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002000598A2 (en) * | 2000-06-29 | 2002-01-03 | Dow Global Technologies Inc. | Process for the production of aromatic amines |
WO2002000598A3 (en) * | 2000-06-29 | 2002-05-16 | Enichem Spa | Process for the production of aromatic amines |
KR100754755B1 (en) * | 2000-06-29 | 2007-09-04 | 다우 글로벌 테크놀로지스 인크. | Process for the production of aromatic amines |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2723611B2 (en) | Process for the production of ethyl alcohol | |
DE2103265A1 (en) | 2,4-and 2,6-tolylenediamines prepn | |
DE940981C (en) | Process for the production of vinyl compounds | |
US2818431A (en) | Preparation of 4-cyclohexenemethylamine | |
EP0292674B1 (en) | Process for the production of propinol | |
DE2044657A1 (en) | Toluylene diamine prepn - using solid ni or ru - contg catalyst | |
EP0963369B1 (en) | Method for separating 6-aminocapronitrile from mixtures containing 6-aminocapronitrile and an imine | |
DE2205958C3 (en) | Process for the purification of tertiary aliphatic amines | |
CH325080A (en) | Process for the preparation of organic hydroxylamine compounds | |
DE574137C (en) | Process for the preparation of piperidine and its offshoots | |
DE956754C (en) | Process for the preparation of cycloaliphatic amines | |
US2989546A (en) | Synthesis of furans | |
EP0106038A1 (en) | Method for the preparation of isocyanic acid or aliphatic isocyanates by an oxidative dehydratation of formamides | |
DE2243811C3 (en) | Process for the preparation of methyl formate | |
AT206428B (en) | Process for the production of cyclohexane by catalytic hydrogenation of benzene | |
DE10117065A1 (en) | Process for the production of C5 acetate | |
DE3441989C2 (en) | ||
DE894558C (en) | Process for the preparation of carbonic acid amides | |
AT229857B (en) | Process for the production of acrolein and / or acrylonitrile or their homologues | |
DE874910C (en) | Process for the catalytic production of hydroquinones | |
DE102015000321A1 (en) | Process for the preparation of 1,4-butanediol by metathesis of allyl alcohol | |
DE629698C (en) | Process for the preparation of amides of 5,6,7,8-tetrahydro-2,3-oxynaphthoic acid | |
DE1282018B (en) | Process for the preparation of an isomer mixture of bis (4-aminocyclohxyl) methane with equilibrium distribution of the isomers | |
DE2410330A1 (en) | PROCESS FOR THE MANUFACTURING OF AETHYLENEDIAMINE WITH LOW WATER CONTENT | |
DE1044099B (en) | Process for the preparation of tolylenediamine |