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CH129185A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

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Publication number
CH129185A
CH129185A CH129185DA CH129185A CH 129185 A CH129185 A CH 129185A CH 129185D A CH129185D A CH 129185DA CH 129185 A CH129185 A CH 129185A
Authority
CH
Switzerland
Prior art keywords
preparation
amino
dye
red
monoazo dye
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
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 Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH129185A publication Critical patent/CH129185A/en

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Description

  

  Verfahren zur Darstellung eines     llonoazofarbstoffes.       Es wurde gefunden, dass ein wertvoller  roter     Monoazofarbstoff    entsteht, wenn man  die     Diazoverbindung    der     1-Amino-2-sulfo-          beiizol-5-carbonsäure    in saurer Lösung mit       2-Amino-8-naphtol-6-sulfosäure    kombiniert.

    <I>Beispiel:</I>  43,4 kg     1-Amino-2-sulfobenzol-5-carbon-          säure    werden in 500 Liter Wasser verteilt  und nach Zusatz von 25 kg Salzsäure 30     %ig          finit    13,8 kg     Natriumnitrit    bei<B>10'</B>     diazotiert.     Die Suspension der     Diazoverbindung    ver  mischt man mit einer frisch ausgefällten  Aufschlämmung von 48 kg     2-Amino-8-naph-          tol-6-sulfosäure    in 500 Liter Wasser. Die  Kupplung ist nach mehrstündigem Rühren  bei 35   fertig, worauf der Farbstoff mit       Koehsalz    ausgefällt, filtriert und getrocknet  wird.

      Der Farbstoff stellt ein dunkelviolettes  Pulver dar, löslich in Wasser mit rubin  roter, in konzentrierter Schwefelsäure mit       gelblichroter    Farbe. Er färbt auf Wolle  ein lebhaftes Rot von guter Lichtechtheit  und guter     Egalisierfähigkeit.  



  Process for the preparation of an ionoazo dye. It has been found that a valuable red monoazo dye is formed when the diazo compound of 1-amino-2-sulfo-beiizole-5-carboxylic acid is combined in acidic solution with 2-amino-8-naphthol-6-sulfonic acid.

    <I> Example: </I> 43.4 kg of 1-amino-2-sulfobenzene-5-carboxylic acid are distributed in 500 liters of water and after adding 25 kg of hydrochloric acid 30% finite 13.8 kg of sodium nitrite at < B> 10 '</B> diazotized. The suspension of the diazo compound is mixed with a freshly precipitated slurry of 48 kg of 2-amino-8-naphthol-6-sulfonic acid in 500 liters of water. The coupling is ready after stirring for several hours at 35, whereupon the dye is precipitated with Koehsalz, filtered and dried.

      The dye is a dark violet powder, soluble in water with a ruby red color, in concentrated sulfuric acid with a yellowish red color. It dyes wool a vivid red with good lightfastness and good leveling properties.

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren zur Darstellung eines roten Monoazofarbstoffes, dadurch gekennzeichnet, dass man die Diazoverbindung der 1-Amino- 2-sulf obenzol-5-carbonsäure mit 2-Amino-8- naphtol-6-sulfosäure in saurer Lösung kom biniert. Der Farbstoff stellt ein dunkel violettes Pulver dar, löslich in Wasser mit rubinroter, in konzentrierter Schwefelsäure mit gelblichroter Farbe. Er färbt auf Wolle ein lebhaftes Rot von guter Lichtechtheit und guter Egalisierfähigkeit. <B> PATENT CLAIM: </B> Process for the preparation of a red monoazo dye, characterized in that the diazo compound of 1-amino-2-sulfobenzene-5-carboxylic acid is mixed with 2-amino-8-naphthol-6-sulfonic acid in acidic Solution combined. The dye is a dark violet powder, soluble in water with a ruby red color, in concentrated sulfuric acid with a yellowish red color. It dyes wool a vivid red with good lightfastness and good leveling properties.
CH129185D 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye. CH129185A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE129185X 1926-07-29
CH127529T 1927-07-08

Publications (1)

Publication Number Publication Date
CH129185A true CH129185A (en) 1928-12-01

Family

ID=25710918

Family Applications (1)

Application Number Title Priority Date Filing Date
CH129185D CH129185A (en) 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH129185A (en)

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