DE551255C - Process for the preparation of aromatic amines - Google Patents

Process for the preparation of aromatic amines

Info

Publication number
DE551255C
DE551255C DE1930551255D DE551255DD DE551255C DE 551255 C DE551255 C DE 551255C DE 1930551255 D DE1930551255 D DE 1930551255D DE 551255D D DE551255D D DE 551255DD DE 551255 C DE551255 C DE 551255C
Authority
DE
Germany
Prior art keywords
aromatic amines
preparation
iron
phosphoric acid
reduction
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
Application number
DE1930551255D
Other languages
German (de)
Inventor
Dr Ulrich Haberland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Application granted granted Critical
Publication of DE551255C publication Critical patent/DE551255C/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09CTREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/22Compounds of iron
    • C09C1/24Oxides of iron

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Herstellung aromatischer Amine In den Patentschriften .163 773 und d6.1. 561 sind Verfahren beschrieben, mit deren Hilfe es gelingt, bei der Herstellung aromatischer Amine durch Reduktion der entsprechenden N itrov erbindttngen mit Eisen und Säure oder mit Eisen und hydralysierbaren Metallsalzen das anfallende Eiseno@ydulolyd in einer besonders wertvollen, zur Herstellung von Farben hervorragend geeigneten Form zu gewinnen.Process for the preparation of aromatic amines In the patents .163 773 and d6.1. 561 processes are described with the help of which it is possible, in the production of aromatic amines, by reducing the corresponding nitro compounds with iron and acid or with iron and hydrolyzable metal salts, to obtain the ferrous hydroxide in a particularly valuable form that is excellently suited for the production of paints to win.

Wie nun weiter gefunden wurde, beeinflußt bei der Durchführung der Verfahren obengenannter Patentschriften ein Zusatz von Phosphorsäure die Natur der zu gewinnenden Eisenoxydfarben in hohem Grade. Je nach der Menge der zugefügten Phosphorsäure erhält man oxy dulhaltige Eiseno-xy dhydrate von hell- bis dunkelbraunem Farbton.As has now been further found, influenced in the implementation of the Process of the above-mentioned patents an addition of phosphoric acid is the nature of the iron oxide paints to a high degree to be mined. Depending on the amount of added Phosphoric acid gives oxy-duliferous iron oxyhydrates from light to dark brown Hue.

Beispiel Man mischt 12,7 kg einer Eisenchlorürlösung vom spei. Gewicht i,27 mit io kg Phosphorsäure in i5o 1 Wasser, fügt Zoo kg genahlenes Eisen hinzu und läßt bei Siedetemperatur Zoo kg Nitrobenzol einlaufen. Nach Beendigung der Reduktion und Abtrennung des entstandenen Anilins gewinnt man durch Auswaschen und Trocknen des entstandenen Schlammes 25o kg einer Mineralfarbe von schönem dunkelbraunen Ton und ausgezeichneter Deckkraft.Example 12.7 kg of an iron chloride solution are mixed from the spei. Weight 1.27 with 10 kg of phosphoric acid in 150 l of water, adds Zoo kg of ground iron and lets in at the boiling point Zoo kg of nitrobenzene. After the reduction and separation of the aniline formed, 250 kg of a mineral color of a beautiful dark brown tone and excellent covering power are obtained by washing out and drying the resulting sludge.

Verwendet man statt der obengenannten Menge von io kg Phosphorsäure 16 kg, so bildet sich eine wertvolle hellbraune Eiseno@vdfarbe.If one uses instead of the above-mentioned amount of 10 kg of phosphoric acid 16 kg, a valuable light brown Eiseno @ vd color is formed.

Durch Glühen erhält man aus diesen Produkten leuchtend hellrote bis dunkele iolettrote E isenoxydfarben.Glowing gives these products a bright red to dark iolet-red iron oxide colors.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung aromatischer Amine durch Reduktion der entsprechenden Nitroverbindungen mit Eisen und konzentrierten wäßrigen Salzlösungen, dadurch gekennzeichnet, daß man die Reduktion in Gegenwart von Phosphorsäure vornimmt.PATENT CLAIM: Process for the production of aromatic amines by Reduction of the corresponding nitro compounds with iron and concentrated aqueous Salt solutions, characterized in that the reduction is carried out in the presence of phosphoric acid undertakes.
DE1930551255D 1930-12-28 1930-12-28 Process for the preparation of aromatic amines Expired DE551255C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE551255T 1930-12-28

Publications (1)

Publication Number Publication Date
DE551255C true DE551255C (en) 1932-05-30

Family

ID=6562972

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930551255D Expired DE551255C (en) 1930-12-28 1930-12-28 Process for the preparation of aromatic amines

Country Status (1)

Country Link
DE (1) DE551255C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249843A1 (en) * 1986-06-18 1987-12-23 Bayer Ag Manufacturing process for black iron oxide pigments having high tinting strength, obtained by the nitrobenzenereduction method
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249843A1 (en) * 1986-06-18 1987-12-23 Bayer Ag Manufacturing process for black iron oxide pigments having high tinting strength, obtained by the nitrobenzenereduction method
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

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