CH136921A - Process for the preparation of a basic azo dye. - Google Patents

Process for the preparation of a basic azo dye.

Info

Publication number
CH136921A
CH136921A CH136921DA CH136921A CH 136921 A CH136921 A CH 136921A CH 136921D A CH136921D A CH 136921DA CH 136921 A CH136921 A CH 136921A
Authority
CH
Switzerland
Prior art keywords
preparation
dye
azo dye
basic azo
water
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie 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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH136921A publication Critical patent/CH136921A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Herstellung eines basischen     Azofarbstofes.       Vorliegendes Patent bezieht sich auf ein  Verfahren zur Herstellung des Farbstoffes  der     wahrsch:        inlichen    Formel  
EMI0001.0004     
    dadurch gekennzeichnet; dass man     Acetyl-          dehydrothio-p-toluidin    mit     Dimethylsulfat    be  handelt, das Reaktionsprodukt verseift,     dia-          zotiert    und mit     ,3-Naphthol    kuppelt.  



  Der so erhaltene Farbstoff ist identisch  mit dem im Patent Nr.<B>136385</B> beschriebenen  Farbstoff.  



  <I>Beispiel:</I>  8,5 kg     Acetyldehydrothio-p-toluidin    werden  in ungefähr 260 kg heissem Chlorbenzol ge  löst und nach Zugabe von 5 kg     Dimethyl-          sulfat    einige Stunden unter     Rückfluss    gekocht.  Nach dem Abkühlen wird das Reaktions-         produkt        abfiltriert.    Zur Reinigung löst man  es in heissem Wasser und fällt die filtrierte  Lösung mit Kochsalz. Das Produkt ist leicht  löslich in Wasser und kristallisiert daraus  in gelben Kristallen vom Schmelzpunkt 204  bis 205  .

   Zur     Verseifung    erwärmt man es  ungefähr 1 Stunde mit 70 kg Wasser und  12 kg Salzsäure     (d=1,15).    Nach dem Ab  kühlen fügt man ungefähr 14 kg Natron  lauge 40       B6    zu, filtriert die ausgefällte Base  ab, wäscht mit Salzwasser und trocknet. Sie  bildet so ein orangegelbes Pulver, das sich  in Wasser und Alkohol leicht, in Chlorbenzol  schwer löst und einen schwach basischen  Charakter zeigt. Seine     Diazoverbindung    ist  in Wasser leicht löslich.  



  29 kg dieser. Base werden in gewöhn  licher Weise dianotiert und mit einer     soda-          alkalischen    Lösung von 15,1 kg     ,3-Naphthol     gekuppelt. Nach mehrstündigem Rühren er  wärmt man auf ungefähr 40   und filtriert  den     Farbstoff,    ab. Zur Reinigung löst man      in heissem Wasser unter Zusatz von Salz  säure bis zur schwach sauren Reaktion und  fällt die filtrierte Lösung mit Kochsalz.



  Process for the preparation of a basic azo dye. The present patent relates to a process for the preparation of the dye of the true formula
EMI0001.0004
    characterized; that acetyldehydrothio-p-toluidine is treated with dimethyl sulfate, the reaction product is saponified, diazotized and coupled with, 3-naphthol.



  The dye thus obtained is identical to the dye described in Patent No. 136385.



  <I> Example: </I> 8.5 kg of acetyldehydrothio-p-toluidine are dissolved in about 260 kg of hot chlorobenzene and, after adding 5 kg of dimethyl sulfate, refluxed for a few hours. After cooling, the reaction product is filtered off. To clean it, it is dissolved in hot water and the filtered solution is precipitated with common salt. The product is easily soluble in water and crystallizes from it in yellow crystals with a melting point of 204 to 205.

   For saponification, it is heated for about 1 hour with 70 kg of water and 12 kg of hydrochloric acid (d = 1.15). After cooling, about 14 kg of caustic soda 40 B6 are added, the precipitated base is filtered off, washed with salt water and dried. It forms an orange-yellow powder that dissolves easily in water and alcohol, difficult in chlorobenzene and has a weakly basic character. Its diazo compound is easily soluble in water.



  29 kg of this. Base are dianotized in the usual way and coupled with a soda-alkaline solution of 15.1 kg, 3-naphthol. After stirring for several hours, it is warmed to about 40 and the dye is filtered off. For cleaning, it is dissolved in hot water with the addition of hydrochloric acid until the reaction is weakly acidic and the filtered solution is precipitated with common salt.

 

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren 'zur Darstellung eines Farb stoffes, dadurch gekennzeichnet, dass man Acetyldehydrothio-p-toluidin mit Dimethyl- suIfat behandelt, das Reaktionsprodukt ver seift, dianotiert und mit f-Naphthol kuppelt. Der so erhaltene Farbstoff ist identisch mit dem im Patent Nr. 136385 beschriebenen Farbstoff. <B> PATENT CLAIM: </B> Process for the preparation of a dye, characterized in that acetyldehydrothio-p-toluidine is treated with dimethyl sulfate, the reaction product is soaped off, dianotized and coupled with f-naphthol. The dye thus obtained is identical to the dye described in Patent No. 136385.
CH136921D 1927-05-21 1928-05-18 Process for the preparation of a basic azo dye. CH136921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE136921X 1927-05-21

Publications (1)

Publication Number Publication Date
CH136921A true CH136921A (en) 1929-12-15

Family

ID=5666601

Family Applications (1)

Application Number Title Priority Date Filing Date
CH136921D CH136921A (en) 1927-05-21 1928-05-18 Process for the preparation of a basic azo dye.

Country Status (1)

Country Link
CH (1) CH136921A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864812A (en) * 1954-12-15 1958-12-16 Geigy Ag J R Water soluble dye salts
US2883373A (en) * 1955-01-28 1959-04-21 Geigy Ag J R Water soluble azo colour salts
US2889315A (en) * 1954-12-15 1959-06-02 Geigy Ag J R Water soluble dye salts and process for the production thereof
US2922690A (en) * 1956-04-18 1960-01-26 Basf Ag Dyestuffs for dyeing and printing fibre mixtures which contain fibres containing acrylonitrile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864812A (en) * 1954-12-15 1958-12-16 Geigy Ag J R Water soluble dye salts
US2889315A (en) * 1954-12-15 1959-06-02 Geigy Ag J R Water soluble dye salts and process for the production thereof
US2883373A (en) * 1955-01-28 1959-04-21 Geigy Ag J R Water soluble azo colour salts
US2922690A (en) * 1956-04-18 1960-01-26 Basf Ag Dyestuffs for dyeing and printing fibre mixtures which contain fibres containing acrylonitrile

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