CH153394A - Process for the preparation of a black azo dye. - Google Patents
Process for the preparation of a black azo dye.Info
- Publication number
- CH153394A CH153394A CH153394DA CH153394A CH 153394 A CH153394 A CH 153394A CH 153394D A CH153394D A CH 153394DA CH 153394 A CH153394 A CH 153394A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- black
- amino
- coupled
- azo dye
- Prior art date
Links
Landscapes
- Cosmetics (AREA)
Description
Verfahren zur Herstellung eines schwarzen Azofarbstoffes. Vorliegendes Patent bezieht sich auf ein Verfahren zur Herstellung eines schwarzen Azofarbstoffes, dadurch gekennzeichnet, dass man<B>p -</B> Nitroanilin diazotiert und in saurer Lösung mit 1-Amino-8-iiaphtol-4.6-disulfo- säure kuppelt, den Monoazofarbstoff in alka lischer Lösung mit diazotiertem 5-Nitro-2- amino-l-anisol kuppelt, den Disazofarbstoff reduziert,
tetrazotiert und mit m-Phenylen- diamin kuppelt.
Der so erhaltene Farbstoff ist ein schwar zes wasserlösliches Pulver Lind färbt Baum wolle in schwarzen Tönen, die durch Nach- behaiidlungmitFormaldehydundKupfersalzen etwas grünstichiger, sowie wasch- und licht echt werden.
<I>Beispiel:</I> <B>13,8 kg p -</B> Nitrauflin werden in üblicher Weise diazotiert und in saurem Medium mit <B>31,9 kg</B> 1-Amino-8-naphtol-4.6-disLilfosäure gekuppelt. Der erhaltene Monoazofarhstoff wird in sodaalkalischer Lösung mit einer aus <B>16,6 kg</B> 5-Nitro-2-amino-l-anisol bereiteten Diazolösung weitergekuppelt und der isolierte Disazofarbstoff mit einer Lösung von<B>72 kg</B> kristallisiertem Schwefelnatrium reduziert.
Der abgeschiedene Farbstoff wird mit Wasser angeteigt und unter Kühlung mit einer wäs serigen Lösung von 14<B>kg</B> Natriumnitrit und überschüssiger Salzsäure versetzt. Die erhal tene Tetrazo <B>-</B> Suspension lässt man in eine, überschüssige Soda enthaltende Lösung von 22<B>kg</B> m-Phenylendiamin laufen. Der durch Aussalzen abgeschiedene Farbstoff wird fil triert und getrocknet.
Process for the preparation of a black azo dye. The present patent relates to a process for producing a black azo dye, characterized in that <B> p - </B> nitroaniline is diazotized and coupled in acidic solution with 1-amino-8-iiaphthol-4,6-disulphonic acid, the Coupling monoazo dye in alkaline solution with diazotized 5-nitro-2-amino-1-anisole, reducing the disazo dye,
tetrazotized and coupled with m-phenylenediamine.
The dye obtained in this way is a black, water-soluble powder and dyes cotton in black tones which, after treatment with formaldehyde and copper salts, become a little greener and are washable and lightfast.
<I> Example: </I> <B> 13.8 kg p - </B> Nitrauflin are diazotized in the usual way and in an acidic medium with <B> 31.9 kg </B> 1-amino-8- naphtol-4,6-disilfonic acid coupled. The monoazo solid obtained is further coupled in a soda-alkaline solution with a diazo solution prepared from <B> 16.6 kg </B> 5-nitro-2-amino-1-anisole and the isolated disazo dye with a solution of <B> 72 kg </ B> crystallized sulfur sodium reduced.
The deposited dye is made into a paste with water and, while cooling, an aqueous solution of 14 kg sodium nitrite and excess hydrochloric acid are added. The tetrazo suspension obtained is allowed to run into a solution of 22 kg of m-phenylenediamine containing excess soda. The dye deposited by salting out is filtered off and dried.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE153394X | 1929-10-09 | ||
| CH150006T | 1930-10-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH153394A true CH153394A (en) | 1932-03-15 |
Family
ID=25715559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH153394D CH153394A (en) | 1929-10-09 | 1930-10-06 | Process for the preparation of a black azo dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH153394A (en) |
-
1930
- 1930-10-06 CH CH153394D patent/CH153394A/en unknown
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