CH253712A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH253712A CH253712A CH253712DA CH253712A CH 253712 A CH253712 A CH 253712A CH 253712D A CH253712D A CH 253712DA CH 253712 A CH253712 A CH 253712A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- preparation
- azo dye
- amino
- phosgene
- 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
- C09B43/00—Preparation of azo dyes from other azo compounds
- C09B43/12—Preparation of azo dyes from other azo compounds by acylation of amino groups
- C09B43/136—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents
- C09B43/14—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents with phosgene or thiophosgene
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines Azofar bstoffes. Es wurde gefunden, da,ss <I>ein</I> wertvoller A.zofarbstoff hergestellt werden kann, wenn man 2 Mol des Aminodisazofarbstoffes der Formel
EMI0001.0011
mit Hilfe von Phosgen zum Harnstoffderiva.t vereinigt.
Der neue Farbstoff stellt in trockenem Zustand ein braunes Pulver dar, das, sich in Wasser mit braunroter und in konz. Schwe- \@Is@iure mit blauer Farbe löst Lind die ;@flanzliclie Faser nach dem ein- oder zwei- l.ailigen Nachkupferungsverfahren in sehr @@-ziscliecliten roten Tönen färbt.
Der a.ls Ausgangsprodukt verwendete X.niinodisazofa.rl,stoff der obigen Formel kann dadurch hergestellt werden, dass man i?ia.zotiurte 1 Aminobenzol-2-sulfonsäurc, die in 4-Stellung eine Nitrogruppe oder eine _@ c-laminogruppe enthält, mit 2-0 xy benzoe- sii Lire kuppelt,
die Nitrogruppe bzw. die _1r-yliirniiiogruppe in die Aminogruppe um den so erhaltenen a.minoazofa,rb- ,#toff weiterdiazotiert und mit 1-Amino-3-me- i io--.z3-henzol kuppelt. Dabei findet die zweite Kupplung mit Vorteil in saurem, vorzugs weise schwach .saurem 2,leditim statt.
Die Vereinigung zweier Moleküle des xlriü.nodiazofarbtoffes zum Harnstoffderi- @'a t finit Hilfe von Phosgen kann in an sich Iichitiint;er Weise, z. E. in alkalisch gehalte- nein, wässerigem Medium vorgenommen wer den.
Beispiel: 33,7 Teile 4-Amino-4'-oxy-3'-carboxy-azo- benzol-2-sulfonsäure werden als Natriumsalz in 500 Teilen warmem Wasser gelöst und nach Zugabe von 7 Teilen Natriumnitrit auf eine Mischung von Fis und 46 Teilen 30 % ige Salzsäure ausgetragen. Man lässt einige Stun den unter Kühlung rühren und vereinigt als dann mit einer salzsauren Lösung von<B>12,9</B> Teilen 1-Amino-3-methoxybenzol, wobei die Mineralsäure durch Zugabe von Natrium acetat abgestumpft wird.
Nach beendeter Kupplung wird der Aminodisazofarbstoff ab- gez,cIiieden, hierauf als Natriumsalz in 5000 Teilen Wasser gelöst und in stets schwach alkalischer Lösung bei 40 bis 50 C so lange mit Phosgen behandelt, bis keine Aminover- bindung mehr nachweisbar ist. Der nun aus gefallene Farbstoff wird abfiltriert und ge trocknet.
Process for the production of an azo dye. It has been found that a valuable azo dye can be produced by adding 2 moles of the amino disazo dye of the formula
EMI0001.0011
united with the help of phosgene to urea deriva.t.
When dry, the new dye is a brown powder which, in water with brownish-red and in conc. Sulfur with blue color dissolves the vegetable fiber in very @@ - cicciform red tones by the one- or two-wire copper plating process.
The X.niinodisazofa.rl, substance of the above formula used as the starting product can be prepared by adding 1 aminobenzene-2-sulfonic acid which contains a nitro group or a _ @ c-lamino group in the 4-position , with 2-0 xy benzoe- sii lire domes,
the nitro group or the _1r-yliirniiiogruppe in the amino group around the thus obtained a.minoazofa, rb-, # toff further diazotized and coupled with 1-amino-3-me- io -. z3-henzene. The second coupling advantageously takes place in acidic, preferably weakly acidic 2, single-time.
The union of two molecules of the xlriü.nodiazofarbtoffes to the urea deri- @ 'a t finite with the help of phosgene can in itself Iichitiint; he manner, z. E. in alkaline no, aqueous medium who made the.
Example: 33.7 parts of 4-amino-4'-oxy-3'-carboxy-azobenzene-2-sulfonic acid are dissolved as the sodium salt in 500 parts of warm water and, after the addition of 7 parts of sodium nitrite, to a mixture of Fis and 46 Parts of 30% hydrochloric acid discharged. The mixture is stirred for a few hours while cooling and then combined with a hydrochloric acid solution of 12.9 parts of 1-amino-3-methoxybenzene, the mineral acid being blunted by adding sodium acetate.
When the coupling is complete, the amino disazo dye is drawn off, boiled, then dissolved as the sodium salt in 5000 parts of water and treated with phosgene in a weakly alkaline solution at 40 to 50 ° C. until no more amino compounds can be detected. The now precipitated dye is filtered off and dried ge.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH253712T | 1945-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH253712A true CH253712A (en) | 1948-03-31 |
Family
ID=4470146
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH253712D CH253712A (en) | 1945-07-26 | 1945-07-26 | Process for the preparation of an azo dye. |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH253712A (en) |
ES (1) | ES174414A1 (en) |
-
1945
- 1945-07-26 CH CH253712D patent/CH253712A/en unknown
-
1946
- 1946-07-24 ES ES174414A patent/ES174414A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES174414A1 (en) | 1946-09-16 |
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