CH137950A - Process for the preparation of a new disazo dye. - Google Patents
Process for the preparation of a new disazo dye.Info
- Publication number
- CH137950A CH137950A CH137950DA CH137950A CH 137950 A CH137950 A CH 137950A CH 137950D A CH137950D A CH 137950DA CH 137950 A CH137950 A CH 137950A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- naphthylamine
- new
- preparation
- violet
- Prior art date
Links
Description
Verfahren zur Herstellung eines neuen Disazofarbstoffes. Vorliegendes Patent bezieht sich auf ein Verfahren zur Herstellung des Disazofarbstoffes der Formel:
EMI0001.0003
dadurch gekennzeichnet, dass man die Diazo- verbindung von 1-Naphthylamin-3.6-disulfo- säure mit a-Naphthylamin kuppelt, den so erhaltenen Monoazofarbstoff weiter diazotiert und mit 2.3-Oxynaphthoesäureanilid kuppelt.
Der neue Farbstoff ist in warmem Wasser mit violettblauer Farbe löslich, die auf Zu satz von Natronlauge 'nach Abkühlen der Lösung in violett umschlägt. In konzentrier ter Schwefelsäure löst er sich mit blauer Farbe, die beim Verdünnen mit Wasser zunächst schmutzig grün, dann unter Abscheidung des Farbstoffes violett wird. Wolle wird aus sau- rem Bade in blauschwarzen echten Tönen gefärbt.
Beispiel: Die in bekannter Weise aus der Diazo- verbindung von 30,3 kg 1-Naphthylamin-3.6- disulfosäure und 14,3 kg a-Naphthylamin dargestellte Aminoazoverbindung wird, nach dem sie als Dinatriumsalz in etwa 1000 Liter Wasser in Lösung gebracht und mit 45 kg Salzsäure 19 B6 angesäuert worden ist, mit 6,9 kg Natriumnitrat bei 0-5 diazotiert. Alsdann lässt man die Diazoverbindung in eine alkalische wässerige Lösung von 26,
3 kg 2.3-Oxynaphthoesäureanilid, die mit 24 kg Natronlauge 40 B6 und 20 kg Soda erhalten ist, bei 20-25 einlaufen, wärmt die Mischung nach einigen Stunden auf 60-70 an und salzt mit Kochsalz den Farbstoff aus.
Process for the preparation of a new disazo dye. The present patent relates to a process for the preparation of the disazo dye of the formula:
EMI0001.0003
characterized in that the diazo compound of 1-naphthylamine-3,6-disulfonic acid is coupled with a-naphthylamine, the monoazo dye thus obtained is further diazotized and coupled with 2,3-oxynaphthoic anilide.
The new dye is soluble in warm water with a violet-blue color, which turns violet on addition of sodium hydroxide solution after the solution has cooled. It dissolves in concentrated sulfuric acid with a blue color, which when diluted with water first turns dirty green and then turns purple as the dye separates. Wool is dyed from an acid bath in real blue-black tones.
Example: The aminoazo compound, prepared in a known manner from the diazo compound of 30.3 kg of 1-naphthylamine-3,6-disulfonic acid and 14.3 kg of a-naphthylamine, is then dissolved as a disodium salt in about 1000 liters of water and with 45 kg hydrochloric acid 19 B6 has been acidified, diazotized with 6.9 kg sodium nitrate at 0-5. The diazo compound is then left in an alkaline aqueous solution of 26,
3 kg of 2,3-oxynaphthoic anilide, which is obtained with 24 kg of sodium hydroxide solution 40 B6 and 20 kg of soda, run in at 20-25, heats the mixture to 60-70 after a few hours and saltes out the dye with table salt.
Claims (1)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE137950X | 1927-06-17 | ||
DE50727X | 1927-07-05 | ||
CH136048T | 1928-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH137950A true CH137950A (en) | 1930-01-31 |
Family
ID=27177022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH137950D CH137950A (en) | 1927-06-17 | 1928-06-12 | Process for the preparation of a new disazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH137950A (en) |
-
1928
- 1928-06-12 CH CH137950D patent/CH137950A/en unknown
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