CH281984A - Process for converting an azo dye. - Google Patents

Process for converting an azo dye.

Info

Publication number
CH281984A
CH281984A CH281984DA CH281984A CH 281984 A CH281984 A CH 281984A CH 281984D A CH281984D A CH 281984DA CH 281984 A CH281984 A CH 281984A
Authority
CH
Switzerland
Prior art keywords
converting
azo dye
mole
dye
parts
Prior art date
Application number
Other languages
German (de)
Inventor
Ag Sandoz
Original Assignee
Ag Sandoz
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 Ag Sandoz filed Critical Ag Sandoz
Publication of CH281984A publication Critical patent/CH281984A/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
    • C09B43/44—Preparation of azo dyes from other azo compounds by substituting amine groups for hydroxyl groups or hydroxyl groups for amine groups; Desacylation of amino-acyl groups; Deaminating
    • 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
    • C09B29/00—Monoazo dyes prepared by diazotising and coupling
    • C09B29/02—Monoazo dyes prepared by diazotising and coupling from diazotised o-amino-hydroxy compounds
    • 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
    • C09B29/00—Monoazo dyes prepared by diazotising and coupling
    • C09B29/24—Monoazo dyes prepared by diazotising and coupling from coupling components containing both hydroxyl and amino directing groups
    • C09B29/28—Amino naphthols
    • C09B29/30—Amino naphtholsulfonic acid

Landscapes

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

Description

  

      Zusatzpatent    zum     Hauptpatent    Nr. 278942.    <B>Verfahren zur Umwandlung eines</B>     Azofarbatoffes.       Gegenstand des vorliegenden Patentes ist  ein Verfahren zur     L        mwandlun-        eines        Azofarb-          stoffes,    welches dadurch     (rekennzeiehnet    ist,  dass man den     dureli    saure     Kupplung    von 7.

       llol          2-Diazobeitzol-1.5-dicarbonsäure    mit 1     Mol        2-          Ainino-5-ox-,-naphtlialin-7-sulfonsäiire    erhält  lichen     Azofarbstoff    in     Ge#-enwart    von Na  triumnitrit mit verdünnter Salzsäure behan  delt.  



       Beispiel:     43,1 Teile des auf     2-I)iazobenzol-1.5-dieai@-          bonsäure    durch saure Kupplung auf     2-Amino-          5-oxvnaphthalin-7-sulfonsäure    erhältlichen  Farbstoffes werden in 2000 Teilen Wasser mit  1     4-    Teilen     Natriumhydroxy    d gelöst. Zur Lö  sung fügt     nian    7,5 Teile     Natriumnitrit    zu und       läl3t    dann die Mischung bei     1.5     in mit 120  Teilen Wasser verdünnte 60 Teile konzen  trierte Salzsäure einlaufen.

   Nach ungefähr       24stündigem    Rühren wird mit.     Natriumearbo-          nat    schwach alkalisch gestellt und der neue  Farbstoff durch Aussahen isoliert.     Getroek-          ttet    stellt er ein dunkelbraunes Pulver dar,    das sich in konzentrierter Schwefelsäure mit       rotstiehig    blauer Farbe löst.



      Additional patent to main patent No. 278942. <B> Process for converting </B> an azo carbate. The subject of the present patent is a process for converting an azo dye, which is identified by the fact that the dureli acidic coupling of 7.

       Ilol 2-diazobeitzol-1,5-dicarboxylic acid with 1 mol of 2-amino-5-ox-, - naphthalen-7-sulfonic acid, treated with dilute hydrochloric acid in the presence of sodium nitrite.



       Example: 43.1 parts of the dye obtainable on 2-I) iazobenzene-1.5-dieai@- bonsäure by acidic coupling to 2-amino-5-oxynaphthalene-7-sulfonic acid are dissolved in 2000 parts of water with 1-4 parts of sodium hydroxide . 7.5 parts of sodium nitrite are added to the solution and the mixture is then run at 1.5 parts into 60 parts of concentrated hydrochloric acid diluted with 120 parts of water.

   After stirring for about 24 hours, add. Sodium carbonate made weakly alkaline and the new dye isolated by looking. When dried, it is a dark brown powder that dissolves in concentrated sulfuric acid with a reddish blue color.

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren zur Umwandlung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man den durch saure Kupplung von 1. Mol 2-Diazo- benzol-1.5-diearbonsä,ure mit 1 Mol 2-Amino-5- oxynaphthalin-7-sulfonsäure erhältlichen Azo- farbstoff in Gegenwart von Natriumnitrit mit verdünnter Salzsäure behandelt. <B> PATENT CLAIM: </B> Process for converting an azo dye, characterized in that the acidic coupling of 1 mole of 2-diazo-benzene-1,5-diacid with 1 mole of 2-amino-5- oxynaphthalene-7-sulfonic acid available azo dye treated in the presence of sodium nitrite with dilute hydrochloric acid. Der neue Farbstoff ist ein dunkelbraunes Pulver, das sich in konzentrierter Schwefel säure mit rotstichig blauer Farbe löst. Er besitzt die Zusammensetzung EMI0001.0052 The new dye is a dark brown powder that dissolves in concentrated sulfuric acid with a reddish blue color. He owns the composition EMI0001.0052
CH281984D 1950-03-02 1950-03-02 Process for converting an azo dye. CH281984A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH281984T 1950-03-02
CH278942T 1950-03-02

Publications (1)

Publication Number Publication Date
CH281984A true CH281984A (en) 1952-03-31

Family

ID=25731873

Family Applications (1)

Application Number Title Priority Date Filing Date
CH281984D CH281984A (en) 1950-03-02 1950-03-02 Process for converting an azo dye.

Country Status (1)

Country Link
CH (1) CH281984A (en)

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