CH301443A - Process for the preparation of an acidic disazo dye. - Google Patents

Process for the preparation of an acidic disazo dye.

Info

Publication number
CH301443A
CH301443A CH301443DA CH301443A CH 301443 A CH301443 A CH 301443A CH 301443D A CH301443D A CH 301443DA CH 301443 A CH301443 A CH 301443A
Authority
CH
Switzerland
Prior art keywords
parts
acidic
preparation
disazo dye
solution
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesel Anilin-Soda-Fabrik
Original Assignee
Basf 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 Basf Ag filed Critical Basf Ag
Publication of CH301443A publication Critical patent/CH301443A/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
    • C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
    • C09B35/02—Disazo dyes
    • C09B35/039—Disazo dyes characterised by the tetrazo component
    • C09B35/04—Disazo dyes characterised by the tetrazo component the tetrazo component being a benzene derivative

Landscapes

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

Description

  

  Verfahren zur Herstellung eines sauren     Disazofarbstoffes.            Gegenstand    des vorliegenden Patentes ist  ein Verfahren zur Herstellung eines sauren       Disazofarbstoffes,    welches dadurch gekenn  zeichnet ist, dass man 1     Mol        tetrazotnerte          2,6-Diamino-l-chlorbenzoi-4-sulfonsäure    in  einem sauren Medium mit 1     Mol        2-Amino-          8-oxyna.phthalin        !6-sulfonsäure    umsetzt, dann  die Säure     mindestens    teilweise abstumpft und  mit einem hol     2-Oxynaphthalin    kuppelt.  



  Der so erhaltene Farbstoff eignet sich be  sonders zum Färben von Leder und zeichnet  sieh durch gute Alkali-, Säure- und     Lich-t-          eehtheit    aus.  



  Die im Beispiel angegebenen Teile sind       Gewichtsteile.     



  <I>Beispiel:</I>  222 Teile     2,6-Diamino-l-chlorbenzol-4-sul-          fonsäure    werden in 480 Teilen     konzentrierter     Salzsäure und 1300 Teilen Eis suspendiert       und    mit einer Lösung von 144 Teilen     Na-          t.riumnitrit    in 1000 Teilen     Eiswasser    in     übli-          eher    Weise     tetrazotiert.     



  Die Lösung der     'Tetrazoverbindung    wird  bei 10 bis 1'5  C in eine Lösung von     23e9    Teilen       2-Amino-8-oxynaphthalin-@6-sulfonsäure    in  1000 Teilen Wasser und 100 Teilen     40 /oiger     Natronlauge eingerührt. Man rührt etwa    3 Stunden, bis die halbseitige Kupplung zur       Monoazoverbindung    beendet ist.  



  Inzwischen hat man     144    Teile     2-Oxynaph-          thalin    mit. 120 'Teilen     40o/oiger    Natronlauge  gut verrieben und das Gemisch durch Zugabe  von 1000 Teilen Wasser in:     Lösung    gebracht.  Diese Lösung fügt man zur obigen Lösung  der     Mon.oazoverbindung.    Zur     Beendigung    der  Kupplung lässt man über Nacht rühren. Dann  fällt man den     gebildeten        Disazofarbstoff    mit  2000 Teilen gesättigter Kochsalzlösung und  1000 Teilen festem Kochsalz aus, worauf man  ihn absaugt und trocknet-.

   Man erhält 1020  Teile eines     blaustichig-roten        Disazofarbstoffes,     der sich besonders     zum    Färben von Leder       eignet-.  



  Process for the preparation of an acidic disazo dye. The subject of the present patent is a process for the preparation of an acidic disazo dye, which is characterized in that 1 mol of tetrazot-inert 2,6-diamino-1-chlorobenzoi-4-sulfonic acid in an acidic medium with 1 mol of 2-amino-8- oxyna.phthalin! 6-sulfonic acid, then at least partially blunted the acid and coupled with a hol 2-oxynaphthalene.



  The dye obtained in this way is particularly suitable for dyeing leather and is characterized by good resistance to alkali, acid and light.



  The parts given in the example are parts by weight.



  <I> Example: </I> 222 parts of 2,6-diamino-1-chlorobenzene-4-sulphonic acid are suspended in 480 parts of concentrated hydrochloric acid and 1300 parts of ice and treated with a solution of 144 parts of sodium nitrite in 1000 parts of ice water tetrazotized in the usual manner.



  The solution of the 'tetrazo compound is stirred into a solution of 23-9 parts of 2-amino-8-oxynaphthalene- @ 6-sulfonic acid in 1000 parts of water and 100 parts of 40% sodium hydroxide solution at 10 to 15 ° C. The mixture is stirred for about 3 hours until the half-sided coupling to the monoazo compound has ended.



  You now have 144 parts of 2-oxynaphthalene with you. 120 parts of 40% sodium hydroxide solution were triturated well and the mixture was brought into solution by adding 1000 parts of water. This solution is added to the above solution of the monoazo compound. To end the coupling, the mixture is left to stir overnight. The disazo dye formed is then precipitated with 2000 parts of saturated sodium chloride solution and 1000 parts of solid sodium chloride, whereupon it is filtered off with suction and dried.

   1020 parts of a bluish-tinged red disazo dye are obtained, which is particularly suitable for dyeing leather.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines sauren Disazofarbstoffes, dadurch gekennzeichnet, d'ass man 1 Mol tetrazotierte 2,6-Diamino- 1-chlorbenzol-4-sulfonsäure in einem sauren Medium mit 1 Mol 2-Amino-8-oxynaphthalin- 6--sulfonsäure umsetzt, dann, PATENT CLAIM: A process for the preparation of an acidic disazo dye, characterized in that 1 mol of tetrazotized 2,6-diamino-1-chlorobenzene-4-sulfonic acid is mixed with 1 mol of 2-amino-8-oxynaphthalene-6-- sulfonic acid, then, die Säure minde stens teilweise abstumpft und mit einem Mol 2-Oxynaphthalin kuppelta. Das Produkt stellt einen blaustichig-roten Farbstoff dar. the acid is at least partially blunted and coupled with one mole of 2-oxynaphthalene. The product is a bluish-red dye.
CH301443D 1950-11-02 1951-10-10 Process for the preparation of an acidic disazo dye. CH301443A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE301443X 1950-11-02

Publications (1)

Publication Number Publication Date
CH301443A true CH301443A (en) 1954-09-15

Family

ID=6100062

Family Applications (1)

Application Number Title Priority Date Filing Date
CH301443D CH301443A (en) 1950-11-02 1951-10-10 Process for the preparation of an acidic disazo dye.

Country Status (1)

Country Link
CH (1) CH301443A (en)

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