CH282258A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

Info

Publication number
CH282258A
CH282258A CH282258DA CH282258A CH 282258 A CH282258 A CH 282258A CH 282258D A CH282258D A CH 282258DA CH 282258 A CH282258 A CH 282258A
Authority
CH
Switzerland
Prior art keywords
monoazo dye
olive
violet
preparation
green
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Ciba
Original Assignee
Ciba Geigy
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 Ciba Geigy filed Critical Ciba Geigy
Publication of CH282258A publication Critical patent/CH282258A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B45/00—Complex metal compounds of azo dyes
    • C09B45/02—Preparation from dyes containing in o-position a hydroxy group and in o'-position hydroxy, alkoxy, carboxyl, amino or keto groups
    • C09B45/14—Monoazo compounds
    • C09B45/16—Monoazo compounds containing chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Coloring (AREA)

Description

  

  Verfahren zur Herstellung     eines        Monoazofarbstoffes.       Es wurde gefunden, dass man     zu    einem  wertvollen     Monoazofarbstoff    gelangt, wenn  man     diazotiertes        4-Nitro-6-acetylamino-2-          amino-l-oxybenzol    in alkalischem Medium mit       2,6-Dioxynaphthalin    vereinigt.  



  Der neue Farbstoff löst sich in heissem  Wasser mit grauvioletter, in verdünnter hei  sser     Natriumcarbonat.lösung    mit olivgrüner, in  konzentrierter Schwefelsäure mit.     violettroter     Farbe und färbt. Wolle nach dem     Naehehro-          mier-    und     Einbadchromierverfahren    in     licht-          und    waschechten olivgrünen Tönen.  



  Die     Diazotierung    des     4-Nitro-6-acetylamino-          2-amino-l-oxybenzols    kann nach üblichen an  sich bekannten Methoden, z. B. mit Hilfe von  Mineralsäure, insbesondere Salzsäure und Na  triumnitrit, durchgeführt werden.  



  Die Kupplung wird in neutralem bis     alkali-          sehem,    vorzugsweise in     alkalischem    Medium,  z. B. in     alkaliearbonatalkalisehem,        alkali-          hy        droxydalkalischem    oder     erdalkalihy        droxy        d-          alkalischem    Medium, vorgenommen.  



  <I>Beispiel:</I>  21,1 Teile     4-Nitro-6-acetylamino-2-amino-l-          oxybenzol    werden in 100 Teilen Wasser auf  geschlämmt und nach Zugabe von 20 Teilen    30     o/oiger    Salzsäure     und    Eis bei 5 bis 10  mit  25     Volumteilen        4n-Natriumnitritlösung    in üb  licher Weise     diazotiert.    Die Suspension der       Diazoverbindung    wird durch Zugabe von     Na-          triumcarbonat    neutralisiert und hierauf fil  triert.

   Der erhaltene Filterkuchen wird in die  durch Eiszugabe auf 0  abgekühlte Lösung  von 17 Teilen     2,6-Dioxynaphthalin    in 70     Vo-          lumteilen    2n     NaOH    eingetragen. Man rührt,  bis die     Kupplung    beendet. ist, filtriert den  abgeschiedenen Farbstoff ab und wäscht mit  verdünnter Kochsalzlösung nach.



  Process for the preparation of a monoazo dye. It has been found that a valuable monoazo dye is obtained if diazotized 4-nitro-6-acetylamino-2-amino-1-oxybenzene is combined with 2,6-dioxynaphthalene in an alkaline medium.



  The new dye dissolves in hot water with gray-violet, in dilute hot sodium carbonate solution with olive-green, in concentrated sulfuric acid. purple-red color and stains. Wool after the sewing and chroming process in light and washfast olive green tones.



  The diazotization of 4-nitro-6-acetylamino-2-amino-1-oxybenzene can be carried out by conventional methods known per se, e.g. B. with the help of mineral acid, especially hydrochloric acid and Na trium nitrite, are carried out.



  The coupling is carried out in a neutral to alkaline medium, preferably in an alkaline medium, e.g. B. in alkaliearbonatalkalisehem, alkali- hy droxydalkalischem or erdalkalihy droxy d- alkaline medium, made.



  <I> Example: </I> 21.1 parts of 4-nitro-6-acetylamino-2-amino-l-oxybenzene are suspended in 100 parts of water and, after the addition of 20 parts of 30% hydrochloric acid and ice, at 5% up to 10 with 25 parts by volume of 4N sodium nitrite solution diazotized in the usual way. The suspension of the diazo compound is neutralized by adding sodium carbonate and then filtered.

   The filter cake obtained is introduced into the solution, cooled to 0 by the addition of ice, of 17 parts of 2,6-dioxynaphthalene in 70 parts by volume of 2N NaOH. The mixture is stirred until the coupling has ended. is, the deposited dye is filtered off and washed with dilute saline solution.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Monoazo- farbstoffes, dadurch gekennzeichnet, dass man diazotiertes 4 - Nitro - 6-acetylamino-2-amino-l- oxybenzol in alkalischem Medium mit 2,6-Di- oxynaphthalin vereinigt. PATENT CLAIM: A process for the production of a monoazo dye, characterized in that diazotized 4-nitro-6-acetylamino-2-amino-l-oxybenzene is combined with 2,6-di-oxynaphthalene in an alkaline medium. Der neue Farbstoff löst sich in heissem Wasser mit grauvioletter, in verdünnter hei sser Natriumearbonatlösung mit olivgrüner, in konzentrierter Schwefelsäure mit violettroter Farbe und färbt Wolle nach dem Nachchro- mier- und Einbadchromierverfahren in licht- und waschechten olivgrünen Tönen. The new dye dissolves in hot water with gray-violet, in dilute hot sodium carbonate solution with olive-green, in concentrated sulfuric acid with violet-red color and dyes wool in light- and wash-fast olive-green tones using the post-chroming and single-bath chrome-plating process.
CH282258D 1948-09-03 1948-09-03 Process for the preparation of a monoazo dye. CH282258A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH279910T 1948-09-03
CH282258T 1948-09-03

Publications (1)

Publication Number Publication Date
CH282258A true CH282258A (en) 1952-04-15

Family

ID=25731953

Family Applications (1)

Application Number Title Priority Date Filing Date
CH282258D CH282258A (en) 1948-09-03 1948-09-03 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH282258A (en)

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