CH190042A - Process for the preparation of a nitro dye. - Google Patents

Process for the preparation of a nitro dye.

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Publication number
CH190042A
CH190042A CH190042DA CH190042A CH 190042 A CH190042 A CH 190042A CH 190042D A CH190042D A CH 190042DA CH 190042 A CH190042 A CH 190042A
Authority
CH
Switzerland
Prior art keywords
preparation
nitro dye
dye
good fastness
weight
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 CH190042A publication Critical patent/CH190042A/en

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Description

  

  Verfahren zur Darstellung eines     Nitrofarbstoffes.       Gegenstand des vorliegenden Zusatzpaten  tes ist ein Verfahren zur Darstellung eines  Nitrofarbstoffes, welches dadurch gekenn  zeichnet ist, dass man     1-Chlor-2-nitrobenzol-          4-sulfanilid    mit     4-Aminodiphenylamin-2-sul-          fonsäure    kondensiert.  



  <I>Beispiel:</I>  264 Gewichtsteile     4-Aminodiphenylamin-          2-sulfonsäure    werden durch Eintragen in eine  Lösung von 53 Gewichtsteilen     Natriumcar-          bonat    in der     1.5fachen    Menge Wasser bei  <B>6,0'</B> C in das     Natriumsalz    übergeführt. Nach  Zugabe von 20 Gewichtsteilen Magnesium  ogyd und     313    Gewichtsteilen     1-Chlor-2-nitro-          benzol-4-sulfa.nilid    wird 15 Stunden am       Rückfluss    zum Sieden erhitzt, bis keine     dia-          zotierbare    Base mehr nachweisbar ist.

   Dann  wird durch Zugabe von 53 Gewichtsteilen       Natriumcarbonat    der     Nitrofarbstoff    in das         Natriumsalz    übergeführt, filtriert und mit  Chlornatrium     ausgefällt.     



  Er bildet in getrocknetem Zustand ein  dunkelbraunes Pulver, das Wolle, Seide und  Leder in gelbbraunen Tönen von guten Echt  heitseigenschaften, insbesondere sehr guter  Waschechtheit und Lichtechtheit färbt.



  Process for the preparation of a nitro dye. The subject of the present additional patent is a process for the preparation of a nitro dye, which is characterized in that 1-chloro-2-nitrobenzene-4-sulfanilide is condensed with 4-aminodiphenylamine-2-sulfonic acid.



  <I> Example: </I> 264 parts by weight of 4-aminodiphenylamine-2-sulfonic acid are added to a solution of 53 parts by weight of sodium carbonate in 1.5 times the amount of water at <B> 6.0 '</B> C in transferred to the sodium salt. After the addition of 20 parts by weight of magnesium oxide and 313 parts by weight of 1-chloro-2-nitrobenzene-4-sulfa.nilide, the mixture is refluxed for 15 hours until no more diazotizable base can be detected.

   Then, by adding 53 parts by weight of sodium carbonate, the nitro dye is converted into the sodium salt, filtered and precipitated with sodium chloride.



  In the dried state, it forms a dark brown powder which colors wool, silk and leather in yellow-brown shades of good fastness properties, in particular very good fastness to washing and light fastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Nitro- farbstoffes, dadurch gekennzeichnet, dass man 1-Chlor-2-nitrobenzol-4-sulfanilid mit 4-Ami- nodiphenylamin-2-sulfonsäure kondensiert. Der so erhaltene Farbstoff bildet ein dunkelbraunes Pulver, .das Wolle, Seide und Leder in gelbbraunen Tönen von guten Echt heitseigenschaften, insbesondere sehr guter Waschechtheit und Lichtechtheit färbt. PATENT CLAIM: Process for the preparation of a nitro dye, characterized in that 1-chloro-2-nitrobenzene-4-sulfanilide is condensed with 4-aminodiphenylamine-2-sulfonic acid. The dye thus obtained forms a dark brown powder which dyes wool, silk and leather in yellow-brown shades of good fastness properties, in particular very good fastness to washing and light.
CH190042D 1934-12-22 1935-12-18 Process for the preparation of a nitro dye. CH190042A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE190042X 1934-12-22
CH187696T 1935-12-18

Publications (1)

Publication Number Publication Date
CH190042A true CH190042A (en) 1937-03-31

Family

ID=25721572

Family Applications (1)

Application Number Title Priority Date Filing Date
CH190042D CH190042A (en) 1934-12-22 1935-12-18 Process for the preparation of a nitro dye.

Country Status (1)

Country Link
CH (1) CH190042A (en)

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