CH165038A - Process for the preparation of a black azo dye. - Google Patents
Process for the preparation of a black azo dye.Info
- Publication number
- CH165038A CH165038A CH165038DA CH165038A CH 165038 A CH165038 A CH 165038A CH 165038D A CH165038D A CH 165038DA CH 165038 A CH165038 A CH 165038A
- Authority
- CH
- Switzerland
- Prior art keywords
- black
- dye
- azo dye
- coupled
- amino
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
- C09B35/50—Tetrazo dyes
- C09B35/60—Tetrazo dyes of the type
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Zusatzpatent zum Hauptpatent Nr. 150006. Verfahren zur Herstellung eines schwarzen Azofarbstoffes. Vorliegendes Patent bezieht sich auf ein Verfahren zur Herstellung eines schwarzen Azofarbstoffes, dadurch gekennzeichnet, dass man p-Nitranilin dianotiert und in saurer Lösung mit 1-Amino-8-naphthol-4.6-disulfo- säure kuppelt, den Monoazofarbstoff in al kalischer Lösung mit dianotiertem 5-Nitro- 2-amino-l-anisol kuppelt, den Disazofarbstoff reduziert,
tetrazotiert und mit 1 Mol m-Phe- nylendiamin und 1 Mol 3.5-Diaminobenzoe- säure kuppelt.
Der so erhaltene Farbstoff ist ein schwar zes, wasserlösliches Pulver und färbt Baum wolle in schwarzen Tönen, die durch Nach behandlung mit Formaldehyd und Kupfer salzen wasch- und lichtecht werden.
<I>Beispiel:</I> 13,8 kg p-Nitranilin werden in üblicher Weise dianotiert und in saurem Medium mit 31,9 kg 1-Amirro-8-naphthol-4.6-disrrlfosäure gekuppelt. Der erhaltene Monoazofarbstoff wird in sodaalkalischer Lösung mit einer aus 17,2 kg 5-Nitro-2-amino-l-anisol bereite ten Diazolösung weitergekuppelt und der isolierte Disazofarbstoff mit einer Lösung von 72 kg kristallisiertem Schwefelnatrium reduziert.
Der abgeschiedene Farbstoff wird mit Wasser angeteigt und unter Kühlung mit einer wässerigen Lösung von 14 kg Natriumnitrit und überschüssiger Salzsäure versetzt. Die so erhaltene Tetrazosuspension wird unter Kühlung mit einer wässerigen Lösung von 10,8 kg m-Phenylendiamin ver setzt. Man stumpft die freie Mineralsäure zum Beispiel mit Natriumacetat ab und gibt dann eine überschüssige Soda enthaltende Lösung von 15,2 kg 3.5-Diamino-benzoesäure hinzu. Der erhaltene Farbstoff wird filtriert und getrocknet.
Additional patent to main patent no. 150006. Process for the production of a black azo dye. The present patent relates to a process for the production of a black azo dye, characterized in that p-nitroaniline is dianotized and coupled with 1-amino-8-naphthol-4,6-disulfonic acid in acidic solution, the monoazo dye in alkaline solution with dianotized 5-nitro-2-amino-l-anisole couples, reduces the disazo dye,
tetrazotized and coupled with 1 mol of m-phenylenediamine and 1 mol of 3,5-diaminobenzoic acid.
The dye obtained in this way is a black, water-soluble powder and dyes cotton in black tones, which are washed and lightfast after treatment with formaldehyde and copper salts.
<I> Example: </I> 13.8 kg of p-nitroaniline are dianotized in the usual way and coupled with 31.9 kg of 1-amirro-8-naphthol-4,6-disulfoic acid in an acidic medium. The monoazo dye obtained is further coupled in a soda-alkaline solution with a diazo solution prepared from 17.2 kg of 5-nitro-2-amino-1-anisole and the isolated disazo is reduced with a solution of 72 kg of crystallized sodium sulphide.
The deposited dye is made into a paste with water and, while cooling, an aqueous solution of 14 kg of sodium nitrite and excess hydrochloric acid are added. The tetrazo suspension obtained in this way is ver sets with cooling with an aqueous solution of 10.8 kg of m-phenylenediamine. The free mineral acid is blunted, for example with sodium acetate, and then a solution of 15.2 kg of 3,5-diamino-benzoic acid containing excess soda is added. The dye obtained is filtered and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH150006T | 1930-10-06 | ||
CH165038T | 1933-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH165038A true CH165038A (en) | 1933-10-31 |
Family
ID=25715554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH165038D CH165038A (en) | 1930-10-06 | 1933-03-03 | Process for the preparation of a black azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH165038A (en) |
-
1933
- 1933-03-03 CH CH165038D patent/CH165038A/en unknown
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