CH143591A - Process for the preparation of a stain-coloring disazo dye. - Google Patents
Process for the preparation of a stain-coloring disazo dye.Info
- Publication number
- CH143591A CH143591A CH143591DA CH143591A CH 143591 A CH143591 A CH 143591A CH 143591D A CH143591D A CH 143591DA CH 143591 A CH143591 A CH 143591A
- Authority
- CH
- Switzerland
- Prior art keywords
- parts
- preparation
- stain
- brown
- coloring
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines beizenflirbenden Disazofarbstoffes. Es wurde gefunden, dass man einen wert vollen, beizenfärbenden Disazofarbstoff erhält, wenn man 1-Aminobenzol-2,5-disulfosäure diazotiert, mit 1-Aminonaphtalin kombiniert, erneut diazotiert und mit 1-Oxybenzol-2!- carbonsRure kuppelt.
Beispiel: 25 Teile 1-Aminobenzol-2,5-disulfosäure in 10 % iger Anschlämmung werden nach Zusatz von 12 Teilen Salzsäure 30%ig mit 6,9 Teilen N atriumnitrit diazotiert. In die mit Eis versetzte Diazolösung fliesst eine Lösung von 14,3 Teilen 1-Amino- naphtalin in 150 Teilen Wasser und 12 Tei len Salzsäure 30%ig. Die Kupplungsmasse wird mit Natronlauge neutral gestellt und nach Zusatz von 6,
9 Teilen Natriumnitrit in 35 Teile Salzsäure 30%ig verdünnt mit ?00 Teilen Wasser bei 15 einlaufen ge lassen. Die Diazoverbindung wird mit Koch salz ausgefällt und genresst. Der Presskuchen wird darauf mit 150 Teilen Wasser und 150 Teilen Eis angeteigt, mit 14 Teilen 1-Oxy- benzol-2-carbonsäure als Natronsalz versetzt und 30 Teile Natronlauge 20%ig langsam zufliessen gelassen. Nach beendeter Kupp lung wird mit 10 Teilen Essigsäure 80%ig neutralisiert und der Farbstoff mit Koch salz gefällt.
Der Farbstoff bildet ein braunes Pulver. löslich in Wasser mit gelbbrauner, in konz. Schwefelsäure mit blaugrauer Farbe. Er er zeugt im Chromdruck ein Braun von grosser Seifen-, Wasch- und Lichtechtheit.
Process for the preparation of a stain-flaming disazo dye. It has been found that a valuable, stain-coloring disazo dye is obtained if 1-aminobenzene-2,5-disulfonic acid is diazotized, combined with 1-aminonaphthalene, diazotized again and coupled with 1-oxybenzene-2-carboxylic acid.
Example: 25 parts of 1-aminobenzene-2,5-disulfonic acid in a 10% suspension are diazotized with 6.9 parts of sodium nitrite after addition of 12 parts of 30% hydrochloric acid. A solution of 14.3 parts of 1-amino naphthalene in 150 parts of water and 12 parts of 30% hydrochloric acid flows into the diazo solution mixed with ice. The coupling compound is made neutral with caustic soda and, after adding 6,
9 parts of sodium nitrite in 35 parts of hydrochloric acid, diluted 30% with? 00 parts of water, run in at 15. The diazo compound is precipitated with common salt and then fermented. The press cake is then made into a paste with 150 parts of water and 150 parts of ice, 14 parts of 1-oxybenzene-2-carboxylic acid as sodium salt are added and 30 parts of 20% sodium hydroxide solution are allowed to slowly flow in. After coupling is complete, 80% strength is neutralized with 10 parts of acetic acid and the dye is precipitated with sodium chloride.
The dye forms a brown powder. soluble in water with yellow-brown, in conc. Sulfuric acid with a blue-gray color. With chrome printing, it creates a brown that is extremely fast to soap, washing and light.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE143591X | 1928-02-20 | ||
CH141877T | 1929-04-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH143591A true CH143591A (en) | 1930-11-15 |
Family
ID=25713945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH143591D CH143591A (en) | 1928-02-20 | 1929-02-18 | Process for the preparation of a stain-coloring disazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH143591A (en) |
-
1929
- 1929-02-18 CH CH143591D patent/CH143591A/en unknown
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