DE463773C - Process for the preparation of aromatic amines - Google Patents
Process for the preparation of aromatic aminesInfo
- Publication number
- DE463773C DE463773C DEC36668D DEC0036668D DE463773C DE 463773 C DE463773 C DE 463773C DE C36668 D DEC36668 D DE C36668D DE C0036668 D DEC0036668 D DE C0036668D DE 463773 C DE463773 C DE 463773C
- Authority
- DE
- Germany
- Prior art keywords
- preparation
- aromatic amines
- iron
- reduction
- nitro compounds
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide (Fe2O3)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung aromatischer Amine Bei den üblichen Verfahren der Reduktion aromatischer Nitroverbindungen zu den Aminen mittels Eisen und Salzsäure (vgl. z. B. die Patentschrift 269 542) erhält man das Eisen in Form eines braunschwarzen, farbschwachen Oxyduloxyds von geringem Wert zurück.Process for the preparation of aromatic amines In the usual processes the reduction of aromatic nitro compounds to amines using iron and hydrochloric acid (see e.g. patent specification 269 542) the iron is obtained in the form of a brown-black, weakly colored oxyduloxide of little value.
Es hat sich nun überraschenderweise ergeben, das an Stelle dieses minderwertigen Erzeugnisses ein tiefschwarzes, zur Herstellung von Farben hervorragend geeignetes Oxyduloxyd entsteht, wenn man die Reduktion in Gegenwart konzentrierter SalzIösungen bewirkt, mit der Maßgabe, daß die gelösten Salze sämtlich oder zum Teil einer hydrolytischen - Spaltung zugänglich sind. Im Übrigen ist die Natur der gelösten Salze von geringerer Bedieutung, vorausgesetzt, daß ihre Löslichkeit genügend .groß ist und daß Die zu keinen Nebenreaktionen Anlaß geben können.It has now surprisingly been found that instead of this inferior product a deep black, excellent for the production of colors suitable oxyduloxide is formed when the reduction is concentrated in the presence Salt solutions, with the proviso that the dissolved salts are all or to the Part of a hydrolytic cleavage are accessible. Incidentally, the nature of the dissolved salts of minor importance, provided that their solubility is sufficient . is large and that they cannot give rise to any side reactions.
.An sich ist die Reduktion von Nitroverbindungen mit Eisen und Salzlösungen ohne Anwendung freier Säurebekannt (vgl.Ber. 27 (18941 S. 1432 u. S. 1815. sowie die britische Patentschrift 155 319), doch war die Konzentration der verwendeten Salzlösungen bei keiner der veröffentlichten Verfahrensweisen eine so hohe, daß das entstehende Eisenoxydufoxyd die oben angegebene, besonders wertvolle Beschaffenheit annimmt. Beispiel Zu 12o kg einer 2oprozentigen Eisenchlorürlösung gibt man 25o kg gemahlene Gußspäne und läßt bei Siedetemperatur langsam Zoo kg N-itrobenzol einlaufen. Nach Beendigung der Reduktion wird das Anilin in bekannter Weise gewonnen. Der zurückbleibende Eisenschlamm ist von tiefschwarzer Farbe und großer Ergiebigkeit.In itself is the reduction of nitro compounds with iron and salt solutions known without the use of free acids (see Ber. 27 (18941 p. 1432 and p. 1815. as well as British Patent 155 319), but the concentration was the one used Salt solutions in none of the published procedures are so high that the resulting Eisenoxydufoxyd the especially valuable quality indicated above accepts. EXAMPLE 25o are added to 120 kg of a 2% solution of iron chloride kg of ground cast chips and slowly let in zoo kg of n-itrobenzene at the boiling point. After the reduction has ended, the aniline is obtained in a known manner. The one left behind Iron sludge is deep black in color and very productive.
Beispiel e.Example e.
i 5o kg einer 2oprozentigen Kochsalzlösung werden mit 2o kg Eisenchlorid und 25o kg gemahlenen Guß.spänen versetzt. Dazu läßt man, wie in Beispiel i, Zoo kg Nitrobenzol zulaufen und scheidet das fertige Anilin in bekannter Weise ab.i 50 kg of a 20 percent saline solution are mixed with 20 kg of iron chloride and 250 kg of ground casting chips added. To do this, as in Example i, Zoo kg of nitrobenzene run in and separates the finished aniline in a known manner.
Auch hierbei erhält man ein hochwertiges Eisenoxydschwarz.Here, too, you get a high-quality iron oxide black.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC36668D DE463773C (en) | 1925-05-09 | 1925-05-09 | Process for the preparation of aromatic amines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC36668D DE463773C (en) | 1925-05-09 | 1925-05-09 | Process for the preparation of aromatic amines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE463773C true DE463773C (en) | 1928-08-02 |
Family
ID=7022395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEC36668D Expired DE463773C (en) | 1925-05-09 | 1925-05-09 | Process for the preparation of aromatic amines |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE463773C (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2826941A1 (en) * | 1978-06-20 | 1980-01-10 | Bayer Ag | METHOD FOR PRODUCING IRON OXIDE RED PIGMENTS |
EP0792840A1 (en) * | 1996-02-28 | 1997-09-03 | Bayer Ag | Use of synthetic, bainite-rich iron raw materials for the preparation of iron oxide pigments |
EP0792839A1 (en) * | 1996-02-28 | 1997-09-03 | Bayer Ag | Use of synthetic iron raw materials for the preparation of iron oxide pigments |
US5665157A (en) * | 1995-10-26 | 1997-09-09 | Bayer Ag | Clean color shade, yellow-tinged red iron oxide pigments, and a process for their manufacture, and their use |
US6117228A (en) * | 1997-11-19 | 2000-09-12 | Bayer Ag | Heat-stable iron oxide yellow pigments |
EP4201999A1 (en) | 2021-12-21 | 2023-06-28 | LANXESS Deutschland GmbH | Method for the preparation of iron oxide pigments |
-
1925
- 1925-05-09 DE DEC36668D patent/DE463773C/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2826941A1 (en) * | 1978-06-20 | 1980-01-10 | Bayer Ag | METHOD FOR PRODUCING IRON OXIDE RED PIGMENTS |
US5665157A (en) * | 1995-10-26 | 1997-09-09 | Bayer Ag | Clean color shade, yellow-tinged red iron oxide pigments, and a process for their manufacture, and their use |
EP0792840A1 (en) * | 1996-02-28 | 1997-09-03 | Bayer Ag | Use of synthetic, bainite-rich iron raw materials for the preparation of iron oxide pigments |
EP0792839A1 (en) * | 1996-02-28 | 1997-09-03 | Bayer Ag | Use of synthetic iron raw materials for the preparation of iron oxide pigments |
US5730794A (en) * | 1996-02-28 | 1998-03-24 | Bayer Ag | Use of synthetic, bainite-rich iron raw materials for preparing iron oxide pigments |
US5837216A (en) * | 1996-02-28 | 1998-11-17 | Bayer Ag | Use of synthetic, iron raw materials for preparing iron oxide pigments |
US6086846A (en) * | 1996-02-28 | 2000-07-11 | Bayer Ag | Use of synthetic, iron raw materials for preparing iron oxide pigments |
US6117228A (en) * | 1997-11-19 | 2000-09-12 | Bayer Ag | Heat-stable iron oxide yellow pigments |
EP4201999A1 (en) | 2021-12-21 | 2023-06-28 | LANXESS Deutschland GmbH | Method for the preparation of iron oxide pigments |
WO2023118182A1 (en) | 2021-12-21 | 2023-06-29 | Lanxess Deutschland Gmbh | Method for producing iron oxide pigments |
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