CH107002A - Process for the preparation of a yellow-brown disazo dye. - Google Patents
Process for the preparation of a yellow-brown disazo dye.Info
- Publication number
- CH107002A CH107002A CH107002DA CH107002A CH 107002 A CH107002 A CH 107002A CH 107002D A CH107002D A CH 107002DA CH 107002 A CH107002 A CH 107002A
- Authority
- CH
- Switzerland
- Prior art keywords
- yellow
- brown
- dye
- preparation
- orange
- Prior art date
Links
Landscapes
- Coloring (AREA)
- Paper (AREA)
Description
Verfahren zur Darstellung eines gelbbraunen Disazofarbstoffes. Es wurde gefunden, dass durch Kombina tion von 1 1Mol. Tetrazodiphenyl-2:2'-disulfo- säure (aus Benzidin-2:2'-disulfosä(ire) mit 2 blol. "Xylenolkarbonsäure" der Konstitution
EMI0001.0009
(mit freier Parastellung in bezug auf die Hydroyylgruppe) ein wertvoller gelbbrauner Farbstoff von guten Echheitseigenschaften entsteht.
Gegenüber dem schon bekannten Farb stoff aus 1 Mol. Tetrazobenzidindisulfosäure und 2 Mol. Salicylsäiire oder Kresotinsäure (franz. Patent 451169) weist der neue Farb stoff einen gänzlich verschiedenen Farbton auf (Verschiebung von reingelb bezw. gold gelb nach gelbbraun).
<I>Beispiel:</I> 34,4 kg Benzidin-2: 2'-disulfosäui#e werden mit 10,6 kg Soda und 300 Liter Wasser gelöst und nach Zugabe einer konzentrierten Lösung von 14 kg Nitrit in eine Mischung von 50 kg Salzsäure und 50 kg Eis unter gutem Rühren eingegossen, wobei die Tem peratur auf etwa 13-150 C gehalten wird. Die gebildete Tetrazodiphenyldisulfosäure scheidet sich zum grössten Teil aus. Nach vollendeter Diazotierung wird noch einige Zeit gerührt und dann die dünnflüssige Paste in eine kalte Lösung von 35 kg Xylenol- karbonsäure und 40 kg Na,COa in 150 kg Wasser einlaufen gelassen.
Die Kupplung wird in bekannter Weise (durch Zusatz von Natronlauge) beendigt und der Farbstoff ausgesalzen, filtriert und ge trocknet.
Der neue Farbstoff stellt als Natriumsalz ein orangefarbenes Pulver dar, das in Wasser leicht löslich ist und das sich zum -Unter- schiede vom Farbstoff mit Salicylsäur e in konzentrierter Schwefelsäure nicht mit gelber; sondern mit orangeroter Farbe löst. Er färbt mit Chrom gebeizte Wolle gelbbraun. Mit Chrombeize auf Baumwolle gedruckt liefert der Farbstoff gelbbraune Töne von guten Echtheitseigenschaften.
Process for the preparation of a yellow-brown disazo dye. It was found that by combining 1 1Mol. Tetrazodiphenyl-2: 2'-disulfonic acid (from benzidine-2: 2'-disulfosä (ire) with 2 bol. "Xylenol carboxylic acid" of the constitution
EMI0001.0009
(with a free para position with respect to the hydroyl group) a valuable yellow-brown dye with good authenticity properties is created.
Compared to the already known dye consisting of 1 mol. Tetrazobenzidine disulfonic acid and 2 mol. Salicylic acid or cresotinic acid (French patent 451169), the new dye has a completely different hue (shift from pure yellow or gold yellow to yellowish brown).
<I> Example: </I> 34.4 kg benzidine-2: 2'-disulfosäui # e are dissolved with 10.6 kg soda and 300 liters of water and after adding a concentrated solution of 14 kg nitrite into a mixture of 50 kg of hydrochloric acid and 50 kg of ice are poured in with thorough stirring, the temperature being kept at about 13-150 ° C. Most of the tetrazodiphenyl disulfonic acid formed separates out. After the diazotization is complete, the mixture is stirred for a while and then the thin paste is allowed to run into a cold solution of 35 kg of xylenol carboxylic acid and 40 kg of Na, COa in 150 kg of water.
The coupling is terminated in a known manner (by adding sodium hydroxide solution) and the dye is salted out, filtered and dried.
As the sodium salt, the new dye is an orange-colored powder which is easily soluble in water and which differs from the dye with salicylic acid in concentrated sulfuric acid and not with yellow; but dissolves with orange-red paint. He dyes wool stained with chrome yellow-brown. Printed on cotton with chrome stain, the dye provides yellow-brown tones with good fastness properties.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE107002X | 1922-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH107002A true CH107002A (en) | 1924-10-01 |
Family
ID=5650864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH107002D CH107002A (en) | 1922-12-11 | 1923-12-06 | Process for the preparation of a yellow-brown disazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH107002A (en) |
-
1923
- 1923-12-06 CH CH107002D patent/CH107002A/en unknown
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