CH190316A - Process for the preparation of a new monoazo dye. - Google Patents
Process for the preparation of a new monoazo dye.Info
- Publication number
- CH190316A CH190316A CH190316DA CH190316A CH 190316 A CH190316 A CH 190316A CH 190316D A CH190316D A CH 190316DA CH 190316 A CH190316 A CH 190316A
- Authority
- CH
- Switzerland
- Prior art keywords
- monoazo dye
- preparation
- new monoazo
- new
- parts
- Prior art date
Links
Description
Verfahren zur Herstellung eines neuen Honoazofarbstoifes. Vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung eines neuen llonoazofarbstoffes.
Der neue Monoazofarbstoff löst sich in warmem Wasser mit gelber Farbe und in konzentrierter Schwefelsäure mit gelber Farbe. Er färbt Wolle aus einem neutralen oder sauren Bad in gelben Tönen von guter Wasch- und Walkechtheit.
Gemäss der Erfindung wird p-Dodecyl- anilin diazotiert und mit 1-(4'-sulfophenyl)- 3-karboxy-5-pyrazolon gekuppelt.
Beispiel: 26,1 Teile p-Dodecylanilin (hergestellt nach dem von Beran für p-Octylaniline an gewandten Verfahren, Ber. der deutschen chem. Ges., 1885, 18, 132) werden 15 Minu ten bei gewöhnlicher Temperatur mit 250 Teilen Salzsäure (36 %) und 300 Teilen Was ser umgerührt, worauf das Gemisch auf <B>50'</B> C erwärmt wird, bis eine homogene Paste sich bildet. Man setzt genügend Eis zu, m das Ganze auf 5 C abzukühlen.
Bei dieser Temperatur wird das Amin durch langsamen Zusatz von 69 Teilen einer zehn prozentigen wässerigen Lösung von Natrium nitrit diazotiert, wobei eine blasse, grünlich- gelbe Lösung erhalten wird. Wenn die Diazo- tierung vollendet ist, lässt man die Diazo- lösung in eine Lösung von 33 Teilen des Na triumsalzes von 1-(4'-sulfophenyl)-3-kar- boxy-5-pyrazolon und 21 Teilen Natrium karbonat in 400 Teilen Wasser einfliessen.
Die Kupplung ist rasch beendet. Man setzt das Rühren fort, bis der Farbstoff körnig ge worden ist. Alsdann wird filtriert, mit fünf prozentiger Salzlösung gewaschen und ge trocknet.
Process for the production of a new honoazo dye. The present invention relates to a process for the preparation of a new ionoazo dye.
The new monoazo dye dissolves in warm water with a yellow color and in concentrated sulfuric acid with a yellow color. It dyes wool from a neutral or acidic bath in yellow tones that are washable and milled fast.
According to the invention, p-dodecylaniline is diazotized and coupled with 1- (4'-sulfophenyl) -3-carboxy-5-pyrazolone.
Example: 26.1 parts of p-dodecylaniline (prepared according to the method used by Beran for p-octylaniline, Ber. Der Deutschen chem. Ges., 1885, 18, 132) are mixed with 250 parts of hydrochloric acid for 15 minutes at normal temperature ( 36%) and 300 parts of water are stirred, whereupon the mixture is heated to <B> 50 '</B> C until a homogeneous paste forms. Sufficient ice is added to cool the whole thing down to 5 ° C.
At this temperature, the amine is diazotized by the slow addition of 69 parts of a ten percent aqueous solution of sodium nitrite, a pale, greenish-yellow solution being obtained. When the diazotization is complete, the diazo solution is immersed in a solution of 33 parts of the sodium salt of 1- (4'-sulfophenyl) -3-carboxyl-5-pyrazolone and 21 parts of sodium carbonate in 400 parts Pour in water.
The coupling ends quickly. Stirring is continued until the dye has become granular. It is then filtered, washed with five percent salt solution and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190316X | 1934-06-28 | ||
CH184012T | 1935-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH190316A true CH190316A (en) | 1937-04-15 |
Family
ID=25720953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH190316D CH190316A (en) | 1934-06-28 | 1935-06-28 | Process for the preparation of a new monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH190316A (en) |
-
1935
- 1935-06-28 CH CH190316D patent/CH190316A/en unknown
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