CH199466A - Process for the preparation of a nitro dye. - Google Patents

Process for the preparation of a nitro dye.

Info

Publication number
CH199466A
CH199466A CH199466DA CH199466A CH 199466 A CH199466 A CH 199466A CH 199466D A CH199466D A CH 199466DA CH 199466 A CH199466 A CH 199466A
Authority
CH
Switzerland
Prior art keywords
preparation
nitro dye
brown
yellow
nitro
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
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
Publication of CH199466A publication Critical patent/CH199466A/en

Links

Description

  

  Verfahren zur Herstellung eines Nitrofarbstoffes.    Es wurde gefunden, dass man wertvolle  wasserlösliche Nitrofarbstoffe erhält, wenn  man aromatische Amine mit Nitroverbin  dungen der aromatischen Reihe, die austausch  bare Halogen-,     Nitro-    oder     Alkogygruppen     enthalten, kondensiert, wobei mindestens eine  der Komponenten eine oder mehrere     Alkyl-          SOsH-        bezw.        Alkyl-COOH-Gruppen    enthält.  



  Die erhaltenen Farbstoffe zeichnen sich  durch gute Echtheitseigenschaften aus und  eignen sich insbesondere zum Färben von  Leder.  



  Die Kondensation erfolgt in Wasser oder  in organischen Lösungsmitteln oder in Ge  mischen beider nach an sich bekannten Me  thoden. Die Umsetzung kann sowohl durch  Erwärmen am     Rückflusskühler    als auch unter  Druck vorgenommen werden.  



  Gegenstand des vorliegenden Patentes ist  ein Verfahren zur Herstellung eines     Nitro-          farbstoffes,    welches dadurch gekennzeichnet  ist, dass man     4-Aminophenyl-l-methyltaurin       mit     2-Methogy-3,5-dinitro-l-benzoesäure    kon  densiert.  



  <I>Beispiel;</I>  230 Gewichtsteile     4-Aminophenyl-l-me-          thyltaurin    von der Formel  
EMI0001.0014     
    werden in wenig Wasser mit     Natriumcarbonat     neutralisiert und in Gegenwart von 272 Ge  wichtsteilen kristallisiertem     Natriumacetat     mit 247 Gewichtsteilen     2-Methogy-3,5-diDitro-          1-benzoesäure    etwa 5 Stunden bei 80-90   C  erhitzt. Die Kondensation vollzieht sich rasch.  Beim Erkalten kristallisiert der Farbstoff aus  und wird durch     Natriumchlorid    vollkommen  ausgefällt.

        Das so erhaltene Produkt stellt ein braunes  Pulver dar, das sich leicht in Wasser mit  gelbbrauner Farbe löst und Leder in gelb  braunen Tönen gleichmässig durchfärbt.



  Process for the preparation of a nitro dye. It has been found that valuable water-soluble nitro dyes are obtained if aromatic amines are condensed with Nitroverbin compounds of the aromatic series containing exchangeable halogen, nitro or alkogy groups, at least one of the components being one or more alkyl SOsH-. Contains alkyl COOH groups.



  The dyes obtained are distinguished by good fastness properties and are particularly suitable for dyeing leather.



  The condensation takes place in water or in organic solvents or in mixtures of both according to methods known per se. The reaction can be carried out either by heating on the reflux condenser or under pressure.



  The subject of the present patent is a process for the preparation of a nitro dye, which is characterized in that 4-aminophenyl-1-methyltaurine is condensed with 2-methogy-3,5-dinitro-1-benzoic acid.



  <I> Example; </I> 230 parts by weight of 4-aminophenyl-1-methyltaurine of the formula
EMI0001.0014
    are neutralized with sodium carbonate in a little water and heated in the presence of 272 parts by weight of crystallized sodium acetate with 247 parts by weight of 2-methogy-3,5-diDitro-1-benzoic acid for about 5 hours at 80-90 C. Condensation occurs quickly. On cooling the dye crystallizes out and is completely precipitated by sodium chloride.

        The product obtained in this way is a brown powder which easily dissolves in water with a yellow-brown color and evenly dyes leather in yellow-brown shades.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Nitro farbstoffes, dadurch gekennzeichnet, dass man 4-Aminophenyl-l-methyltaurinmit 2-Metboxy- 3,5-diiiitro-l-benzoesäure kondensiert. Das so erhaltene Produkt stellt ein braunes Pulver dar, das sich leicht in Wasser mit gelbbrauner Farbe löst und Leder in gelbbraunen Tönen gleichmässig durchfärbt. PATENT CLAIM: Process for the production of a nitro dye, characterized in that 4-aminophenyl-1-methyltaurine is condensed with 2-metboxy-3,5-diiiitro-1-benzoic acid. The product obtained in this way is a brown powder which dissolves easily in water with a yellow-brown color and evenly dyes leather in yellow-brown shades.
CH199466D 1936-05-02 1937-04-22 Process for the preparation of a nitro dye. CH199466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE199466X 1936-05-02

Publications (1)

Publication Number Publication Date
CH199466A true CH199466A (en) 1938-08-31

Family

ID=5757567

Family Applications (1)

Application Number Title Priority Date Filing Date
CH199466D CH199466A (en) 1936-05-02 1937-04-22 Process for the preparation of a nitro dye.

Country Status (1)

Country Link
CH (1) CH199466A (en)

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