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CH127529A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

Info

Publication number
CH127529A
CH127529A CH127529DA CH127529A CH 127529 A CH127529 A CH 127529A CH 127529D A CH127529D A CH 127529DA CH 127529 A CH127529 A CH 127529A
Authority
CH
Switzerland
Prior art keywords
preparation
red
monoazo dye
dye
color
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 CH127529A publication Critical patent/CH127529A/en

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Description

  

  Verfahren zur Darstellung eines     Monoazofarbstoffes.       Es wurde gefunden, dass ein wertvoller  roter     Monoazofarbstoff    entsteht, wenn man  die     Diazoverbindung    der     1-Amino-2-sulfo-4-          chlorbenzol-5-carbonsäure    mit     ,B-Naphtol     kombiniert.  



       Beispiel:     50,8 kg     1-Amino-2-sulfo-4-chlorbenzol-5-          carbonsäure    werden in 1000 Liter Wasser  verteilt und nach Zusatz von 25 kg Salz  säure 30     %ig    mit 13,8 kg     Natriumnitrit        di-          azotiert    bei<B>10'.</B> In die mit Natronlauge  gegen Kongopapier fast neutral gemachte       Diazoverbindung    läuft eine Lösung von  29, kg     ss-Naphtol    mit 8 kg     Natriumhydroxyd     in<B>MM</B> Liter Wasser. Nach beendeter  Kupplung wird der Farbstoff mit 25 kg Soda  in Lösung gebracht und mit Chlorkalium  ausgefällt, filtriert und getrocknet.  



  Der Farbstoff stellt ein leuchtend rotes  Pulver dar, löslich in Wasser mit orange    Farbe, in konzentrierter Schwefelsäure mit       fuchsinroter    Farbe. Seine     Calcium-    und Ba  riumverbindungen sind leuchtend rote Lacke  von grosser Schönheit und ausgezeichneter  Lichtechtheit.



  Process for the preparation of a monoazo dye. It has been found that a valuable red monoazo dye is formed when the diazo compound of 1-amino-2-sulfo-4-chlorobenzene-5-carboxylic acid is combined with B-naphthol.



       Example: 50.8 kg of 1-amino-2-sulfo-4-chlorobenzene-5-carboxylic acid are distributed in 1000 liters of water and, after addition of 25 kg of hydrochloric acid, 30% diacotized with 13.8 kg of sodium nitrite at <B > 10 '. </B> A solution of 29 kg ss-naphthol with 8 kg sodium hydroxide in <B> MM </B> liters of water runs into the diazo compound, which has been made almost neutral to Congo paper with sodium hydroxide. After coupling has ended, the dye is dissolved in 25 kg of soda and precipitated with potassium chloride, filtered and dried.



  The dye is a bright red powder, soluble in water with an orange color, in concentrated sulfuric acid with a fuchsin red color. Its calcium and barium compounds are bright red lacquers of great beauty and excellent lightfastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines roten MonoazofarbstofPes, dadurch gekennzeichnet, dass man die Diazoverbindung der 1-Amino- 2-sulfo-4-chlorbenzol-5-carbonsäure mit ss- Naphtol kuppelt. Der Farbstoff stellt ein leuchtend rotes Pulver dar, löslich in Was ser mit orange Farbe, in konzentrierter Schwefelsäure mit fuchsinroter Farbe. Seine Calcium- und Bariumverbindungen sind leuchtend rote Lacke von grosser Schönheit und ausgezeichneter Lichtechtheit. PATENT CLAIM: Process for the preparation of a red MonoazofarbstofPes, characterized in that the diazo compound of 1-amino-2-sulfo-4-chlorobenzene-5-carboxylic acid is coupled with s-naphthol. The dye is a bright red powder, soluble in water with an orange color, in concentrated sulfuric acid with a fuchsin red color. Its calcium and barium compounds are bright red lacquers of great beauty and excellent lightfastness.
CH127529D 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye. CH127529A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE127529X 1926-07-29

Publications (1)

Publication Number Publication Date
CH127529A true CH127529A (en) 1928-09-01

Family

ID=5662109

Family Applications (1)

Application Number Title Priority Date Filing Date
CH127529D CH127529A (en) 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH127529A (en)

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