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CH129186A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

Info

Publication number
CH129186A
CH129186A CH129186DA CH129186A CH 129186 A CH129186 A CH 129186A CH 129186D A CH129186D A CH 129186DA CH 129186 A CH129186 A CH 129186A
Authority
CH
Switzerland
Prior art keywords
red
preparation
dye
monoazo dye
yellow
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 CH129186A publication Critical patent/CH129186A/en

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Description

  

      Verfahren    zur     Darstellung    eines     3Tonoazofarbstoffes.       Es wurde gefunden, dass ein wertvoller  roter     Monoazofarbstoff        entsteht,    wenn man  die     Diazoverbindung    der     1-Amino-2-sulfo-          be        nzol-5-carbonsäure    mit     ss-Naphtol    kombi  niert.  



       Beispiel:          -13,.1    kg     1-Amino-2-sulfobenzol-5-carbon-          säure    werden in 1000 Liter Wasser verteilt  und nach Zusatz von 25 kg Salzsäure 30     %ig          rnit    13,8 kg     Natriumnitrit    bei 10       diazotiert.     In die mit Natronlauge geben Kongopapier  fast neutral gemachte     Diazoverbindung    läuft:  eine Lösung von 29 kg     ss-Naphtol    mit 8     kg;     N     atriumhydrozyd    in     100U    Liter Wasser und  hierauf eine Lösung von 10 kg Soda.

   Nach  beendeter Kupplung wird der Farbstoff bei  <B>60'</B> mit Chlorkalium ausgefällt,     filtriert    und  Getrocknet.    Der Farbstoff stellt ein rotes Pulver dar,  löslich in Wasser mit orangegelber, in     kon-          zentrieter    Schwefelsäure mit     fuchsinroter     Farbe. Er gibt mit Tonerde und Barium leb  hafte gelbrote Lacke.



      Process for the preparation of a 3-toneazo dye. It has been found that a valuable red monoazo dye is formed when the diazo compound of 1-amino-2-sulfobenzene-5-carboxylic acid is combined with β-naphthol.



       Example: -13.1 kg of 1-amino-2-sulfobenzene-5-carboxylic acid are distributed in 1000 liters of water and, after addition of 25 kg of 30% hydrochloric acid, diazotized with 13.8 kg of sodium nitrite at 10%. In the diazo compound made almost neutral by adding sodium hydroxide solution to the Congo paper runs: a solution of 29 kg ss-naphtol with 8 kg; N atrium hydroxide in 100 liters of water and then a solution of 10 kg of soda.

   After the coupling has ended, the dye is precipitated at <B> 60 '</B> with potassium chloride, filtered and dried. The dye is a red powder, soluble in water with an orange-yellow color, and in concentrated sulfuric acid with a fuchsin-red color. With clay and barium, he creates vibrant yellow-red lacquers.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines roten Monoazofarbstoffes, dadurch gekennzeichnet, dass man die Diazoverbindung der 1-Amino- 2-sulfobenzol-5-carbonsäure mit ss-Naphtol kombiniert-. Der Farbstoff stellt ein rotes Pulver dar, löslich in Wasser mit orange gelber, in konzentrierter Schwefelsäure mit fuchsinroter Farbe. Er gibt mit Tonerde und Barium lebhafte gelbrote Lacke. PATENT CLAIM: Process for the preparation of a red monoazo dye, characterized in that the diazo compound of 1-amino-2-sulfobenzene-5-carboxylic acid is combined with ß-naphthol. The dye is a red powder, soluble in water with an orange-yellow color, in concentrated sulfuric acid with a fuchsin-red color. With clay and barium he gives lively yellow-red lacquers.
CH129186D 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye. CH129186A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE129186X 1926-07-29
CH127529T 1927-07-08

Publications (1)

Publication Number Publication Date
CH129186A true CH129186A (en) 1928-12-01

Family

ID=25710919

Family Applications (1)

Application Number Title Priority Date Filing Date
CH129186D CH129186A (en) 1926-07-29 1927-07-08 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH129186A (en)

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