CH218275A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH218275A
CH218275A CH218275DA CH218275A CH 218275 A CH218275 A CH 218275A CH 218275D A CH218275D A CH 218275DA CH 218275 A CH218275 A CH 218275A
Authority
CH
Switzerland
Prior art keywords
dye
azo dye
yellow
preparation
azobenzene
Prior art date
Application number
Other languages
German (de)
Inventor
Gesellschaft Fuer Chemis Basel
Original Assignee
Chem Ind Basel
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 Chem Ind Basel filed Critical Chem Ind Basel
Publication of CH218275A publication Critical patent/CH218275A/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
    • C09B43/00—Preparation of azo dyes from other azo compounds
    • C09B43/04—Preparation of azo dyes from other azo compounds by nitration

Landscapes

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

Description

  

      Zusatzpatent        zum    Hauptpatent Nr. 211492.    Verfahren zur Herstellung eines     Azofarbstoffes.       Es wurde gefunden, dass man einen     Azo-          farbstoff    erhält, wenn man     4-Amino-4',di-          methylamino-1,1'=azobenzol    mit nitrierend  wirkenden     Mitteln    behandelt,     so,dass    eine     Ni-          trogruppe    in das     Farbstoffmolekül    eintritt.  



  Der so erhaltene Farbstoff bildet ein  gelbes Pulver, das sich in     organischen:    Lö  sungsmitteln, wie Aceton,     Essigsäureäthyl-          ester,    mit gelber Farbe löst und das aus  wässeriger Suspension     Acetatkunstseide    in  echten,     gelbbraunen    Tönen f     ärbt.     



       Beispiel:     <B>300</B> Teile Schwefelsäure     werden    auf 0  abgekühlt und unter Rühren mit 27 Teilen  4 -     Amino    -     4'-        dimethylamino    -1,1' -     azobenzol     versetzt. Man gibt eine Mischung, bestehend  aus 7 Teilen     konzentrierter    Schwefelsäure  und 7 Teilen konzentrierter Salpetersäure zu    und rührt bei 0 bis 5   solange, bis die     Nitrie-          rung    beendet ist.  



  Die Lösung wird in Eiswasser ausgetra  gen und der ausgeschiedene Farbstoff ab  filtriert und neutral gewaschen.



      Additional patent to main patent no. 211492. Process for the production of an azo dye. It has been found that an azo dye is obtained if 4-amino-4 ', dimethylamino-1,1' = azobenzene is treated with nitrating agents so that a nitro group enters the dye molecule.



  The dye obtained in this way forms a yellow powder which dissolves in organic solvents such as acetone, ethyl acetate, with a yellow color and which, from an aqueous suspension, dyes acetate rayon in real, yellow-brown tones.



       Example: 300 parts of sulfuric acid are cooled to 0 and 27 parts of 4-amino-4'-dimethylamino -1,1'-azobenzene are added while stirring. A mixture consisting of 7 parts of concentrated sulfuric acid and 7 parts of concentrated nitric acid is added and the mixture is stirred at 0 to 5 until the nitration has ended.



  The solution is extracted in ice water and the precipitated dye is filtered off and washed neutral.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man 4 - Amino - 4'- dimethylamino -1,1'- azobenzol mit nitrierend wirkenden Mitteln behandelt, so @dass eine Nitrogruppe in das Farbstoff molekül eintritt. Claim: Process for the production of an azo dye, characterized in that 4 - amino - 4'-dimethylamino -1,1'-azobenzene is treated with nitrating agents so that a nitro group enters the dye molecule. Der so erhaltene Farbstoff bildet ein gelbes Pulver, das sich in organi schen Lösungsmitteln, wie Aceton, Essig- säureäthylester, mit gelber Farbe löst und das aus wässeriger Suspension Acetatkunst- seide in echten, gelbbraunen Tönen färbt. The dye obtained in this way forms a yellow powder which dissolves in organic solvents such as acetone and ethyl acetate with a yellow color and which, from an aqueous suspension, dyes artificial silk in real, yellow-brown shades.
CH218275D 1940-10-31 1940-10-31 Process for the preparation of an azo dye. CH218275A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH211492T 1940-10-31
CH218275T 1940-10-31

Publications (1)

Publication Number Publication Date
CH218275A true CH218275A (en) 1941-11-30

Family

ID=25725017

Family Applications (1)

Application Number Title Priority Date Filing Date
CH218275D CH218275A (en) 1940-10-31 1940-10-31 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH218275A (en)

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