CH281988A - Process for converting an azo dye. - Google Patents

Process for converting an azo dye.

Info

Publication number
CH281988A
CH281988A CH281988DA CH281988A CH 281988 A CH281988 A CH 281988A CH 281988D A CH281988D A CH 281988DA CH 281988 A CH281988 A CH 281988A
Authority
CH
Switzerland
Prior art keywords
azo dye
converting
acid
dye
diazobenzene
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 CH281988A publication Critical patent/CH281988A/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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

      LllsatzjlateIlt    zum     1lauptpatent    Nr. 278942.    Verfahren zur Umwandlung eines     Azofarbatoü'es.            Gegenstand        des    vorliegenden Patentes ist  ein Verfahren zur Umwandlung eines     Azo-          Farbstoffes,    welches dadurch. gekennzeichnet  ist, dass man den durch saure     Kupplung;

      von  1     11o1        5-Nitro-2-diazobenzol-1.-carbonsäure    mit  1     llol        1-Aniino-S-oxynaphthalin-3.5-disulfori-          säure    erhältlichen     Azofarbstoff    mit verdünn  ter Salzsäure kocht.    <I>Beispiel:</I>  56,1.

   Teile     des    Farbstoffes,     welcher    durch  Kuppeln von     5-Nitro-2-diazobenzol-l-carbon-          sinre    mit     1-A.inino-S-oxyiraphtbaiin-3.5-disnl-          fonsäure    in mineralsaurer Lösung erhalten  wird, werden in 2000 Teilen Wasser gelöst  und die Lösung kochend mit 55 Teilen kon  zentrierter Salzsäure     versetzt.    Nach einstün  digem     Erhitzen    am     Rüekfluss    ist die Umwand  lung in den hellroten leichtlöslichen     Dioxy-          Farbstof        fvollzogen.    Man fällt durch Aus  salzen, filtriert,

   führt den Farbstoff ins Na  triumsalz über und trocknet. Man erhält ein  braunrotes Pulver, das sich in konzentrierter  Schwefelsäure mit violetter Farbe löst.



      LllsatzjlateIlt to the main patent No. 278942. Process for the conversion of an azofarbatoü'es. The present patent is a process for converting an azo dye, which thereby. is characterized in that the by acid coupling;

      of 11o1 of 5-nitro-2-diazobenzene-1-carboxylic acid with 1 llol of 1-aniino-S-oxynaphthalene-3,5-disulforic acid boil with dilute hydrochloric acid. <I> Example: </I> 56.1.

   Parts of the dye, which is obtained by coupling 5-nitro-2-diazobenzene-1-carbon-sinre with 1-A.inino-S-oxyiraphtbaiin-3,5-disnl- fonsäure in mineral acid solution, are dissolved in 2000 parts of water and 55 parts of concentrated hydrochloric acid are added to the boiling solution. After one hour of heating on the reflux, the conversion into the light red, easily soluble dioxy dye is complete. It is precipitated by salting out, filtered,

   transfers the dye into the sodium salt and dries. A brown-red powder is obtained which dissolves in concentrated sulfuric acid with a violet color.

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren zur Umwandlung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man den durch saure Kupplung von 1 Mol 5- Nitro-\?-diazobenzol-l-carbonsäure mit 1 12o1 1- Amino-S-oxynaphthalin-3.5-disulfonsäure er-' hältlichen Azofarbstoff mit verdünnter Salz säure kocht. Der neue Farbstoff ist ein braunrotes Pul ver, das sich in konzentrierter Schwefelsäure mit violetter Farbe löst. <B> PATENT CLAIM: </B> Process for converting an azo dye, characterized in that the acidic coupling of 1 mol of 5-nitro - \? - diazobenzene-1-carboxylic acid with 1 12o1 1- amino-S- oxynaphthalene-3,5-disulfonic acid, available azo dye boils with dilute hydrochloric acid. The new dye is a brownish red powder that dissolves in concentrated sulfuric acid with a purple color. Er besitzt die Ziz- samm ensetzung EMI0001.0041 He owns the Ziz composition EMI0001.0041
CH281988D 1950-03-02 1950-03-02 Process for converting an azo dye. CH281988A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH278942T 1950-03-02
CH281988T 1950-03-02

Publications (1)

Publication Number Publication Date
CH281988A true CH281988A (en) 1952-03-31

Family

ID=25731877

Family Applications (1)

Application Number Title Priority Date Filing Date
CH281988D CH281988A (en) 1950-03-02 1950-03-02 Process for converting an azo dye.

Country Status (1)

Country Link
CH (1) CH281988A (en)

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