CH136921A - Process for the preparation of a basic azo dye. - Google Patents
Process for the preparation of a basic azo dye.Info
- Publication number
- CH136921A CH136921A CH136921DA CH136921A CH 136921 A CH136921 A CH 136921A CH 136921D A CH136921D A CH 136921DA CH 136921 A CH136921 A CH 136921A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- dye
- azo dye
- basic azo
- water
- Prior art date
Links
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines basischen Azofarbstofes. Vorliegendes Patent bezieht sich auf ein Verfahren zur Herstellung des Farbstoffes der wahrsch: inlichen Formel
EMI0001.0004
dadurch gekennzeichnet; dass man Acetyl- dehydrothio-p-toluidin mit Dimethylsulfat be handelt, das Reaktionsprodukt verseift, dia- zotiert und mit ,3-Naphthol kuppelt.
Der so erhaltene Farbstoff ist identisch mit dem im Patent Nr.<B>136385</B> beschriebenen Farbstoff.
<I>Beispiel:</I> 8,5 kg Acetyldehydrothio-p-toluidin werden in ungefähr 260 kg heissem Chlorbenzol ge löst und nach Zugabe von 5 kg Dimethyl- sulfat einige Stunden unter Rückfluss gekocht. Nach dem Abkühlen wird das Reaktions- produkt abfiltriert. Zur Reinigung löst man es in heissem Wasser und fällt die filtrierte Lösung mit Kochsalz. Das Produkt ist leicht löslich in Wasser und kristallisiert daraus in gelben Kristallen vom Schmelzpunkt 204 bis 205 .
Zur Verseifung erwärmt man es ungefähr 1 Stunde mit 70 kg Wasser und 12 kg Salzsäure (d=1,15). Nach dem Ab kühlen fügt man ungefähr 14 kg Natron lauge 40 B6 zu, filtriert die ausgefällte Base ab, wäscht mit Salzwasser und trocknet. Sie bildet so ein orangegelbes Pulver, das sich in Wasser und Alkohol leicht, in Chlorbenzol schwer löst und einen schwach basischen Charakter zeigt. Seine Diazoverbindung ist in Wasser leicht löslich.
29 kg dieser. Base werden in gewöhn licher Weise dianotiert und mit einer soda- alkalischen Lösung von 15,1 kg ,3-Naphthol gekuppelt. Nach mehrstündigem Rühren er wärmt man auf ungefähr 40 und filtriert den Farbstoff, ab. Zur Reinigung löst man in heissem Wasser unter Zusatz von Salz säure bis zur schwach sauren Reaktion und fällt die filtrierte Lösung mit Kochsalz.
Process for the preparation of a basic azo dye. The present patent relates to a process for the preparation of the dye of the true formula
EMI0001.0004
characterized; that acetyldehydrothio-p-toluidine is treated with dimethyl sulfate, the reaction product is saponified, diazotized and coupled with, 3-naphthol.
The dye thus obtained is identical to the dye described in Patent No. 136385.
<I> Example: </I> 8.5 kg of acetyldehydrothio-p-toluidine are dissolved in about 260 kg of hot chlorobenzene and, after adding 5 kg of dimethyl sulfate, refluxed for a few hours. After cooling, the reaction product is filtered off. To clean it, it is dissolved in hot water and the filtered solution is precipitated with common salt. The product is easily soluble in water and crystallizes from it in yellow crystals with a melting point of 204 to 205.
For saponification, it is heated for about 1 hour with 70 kg of water and 12 kg of hydrochloric acid (d = 1.15). After cooling, about 14 kg of caustic soda 40 B6 are added, the precipitated base is filtered off, washed with salt water and dried. It forms an orange-yellow powder that dissolves easily in water and alcohol, difficult in chlorobenzene and has a weakly basic character. Its diazo compound is easily soluble in water.
29 kg of this. Base are dianotized in the usual way and coupled with a soda-alkaline solution of 15.1 kg, 3-naphthol. After stirring for several hours, it is warmed to about 40 and the dye is filtered off. For cleaning, it is dissolved in hot water with the addition of hydrochloric acid until the reaction is weakly acidic and the filtered solution is precipitated with common salt.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE136921X | 1927-05-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH136921A true CH136921A (en) | 1929-12-15 |
Family
ID=5666601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH136921D CH136921A (en) | 1927-05-21 | 1928-05-18 | Process for the preparation of a basic azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH136921A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2864812A (en) * | 1954-12-15 | 1958-12-16 | Geigy Ag J R | Water soluble dye salts |
US2883373A (en) * | 1955-01-28 | 1959-04-21 | Geigy Ag J R | Water soluble azo colour salts |
US2889315A (en) * | 1954-12-15 | 1959-06-02 | Geigy Ag J R | Water soluble dye salts and process for the production thereof |
US2922690A (en) * | 1956-04-18 | 1960-01-26 | Basf Ag | Dyestuffs for dyeing and printing fibre mixtures which contain fibres containing acrylonitrile |
-
1928
- 1928-05-18 CH CH136921D patent/CH136921A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2864812A (en) * | 1954-12-15 | 1958-12-16 | Geigy Ag J R | Water soluble dye salts |
US2889315A (en) * | 1954-12-15 | 1959-06-02 | Geigy Ag J R | Water soluble dye salts and process for the production thereof |
US2883373A (en) * | 1955-01-28 | 1959-04-21 | Geigy Ag J R | Water soluble azo colour salts |
US2922690A (en) * | 1956-04-18 | 1960-01-26 | Basf Ag | Dyestuffs for dyeing and printing fibre mixtures which contain fibres containing acrylonitrile |
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