CH175241A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH175241A CH175241A CH175241DA CH175241A CH 175241 A CH175241 A CH 175241A CH 175241D A CH175241D A CH 175241DA CH 175241 A CH175241 A CH 175241A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- azo dye
- dye
- weight
- parts
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung eines Azofarbstoffes. Gegenstand dieses Zusatzpatentes ist ein Verfahren zur Darstellung eines Azofarb- stoffes, welches darin besteht, dass man 2 . 2'- Dioxy-1 . 1'-dinaphthyl-ar-octohydrid mit der Diazover bindung von 4-Nitro-2-aminophenol- 6-sulfosäure kuppelt.
<I>Beispiel:</I> 23,4 Gewichtsteile 4-Nitro-2-aminophenol- (i-sulfösäure werden in 60 Gewichtsteilen \Nasser und 10 Gewichtsteilen konzentrierter Salzsäure mit. 7 Gewichtsteilen Natrium nitrit dianotiert und zu einer Lösung von I1-,7 Gewichtsteilen 2 . 2'-Dioxy-1 . 1'-dinaph- thyl-ar-oetohydrid in 200 Gewichtsteilen Wasser und 30 Gewichtsteilen Natronlauge von 40' Be hinzugefügt. Nachdem die Kupp lung beendet ist, wird mit konzentrierter Salzsäure bis zur kongosauren Reaktion an gesäuert. Der ausgefällte Farbstoff wird ab gesaugt und getrocknet.
Der getrocknete Farbstoff stellt ein braunes Pulver dar; er färbt. Wolle aus saurem Bade in nach- chromierter Färbung braun. Das nach dem obigen Beispiel verwendete 2. 2'- Dioxy -1 .
1'- dinaphthyl-ar-octohydrid ist erhältlich beispielsweise durch Behandeln des Dinatriumsalzes des 2.2'-Dioxy-1.1'- dinaphthyls in Wasser bei 110 bis 130 C und 30 bis 35 Atm. mit Wasserstoff in Ge genwart eines Nickelkatalysators, bis die zur Bildung des Octohydrids nötige Menge Was serstoff aufgenommen ist. Der Schmelzpunkt liegt bei 139 bis 140 C.
Process for the preparation of an azo dye. The subject of this additional patent is a process for the preparation of an azo dye, which consists in that one 2. 2'-dioxy-1. 1'-dinaphthyl-ar-octohydride couples with the diazo bond of 4-nitro-2-aminophenol-6-sulfonic acid.
<I> Example: </I> 23.4 parts by weight of 4-nitro-2-aminophenol- (i-sulfoic acid are dianotized in 60 parts by weight of water and 10 parts by weight of concentrated hydrochloric acid with 7 parts by weight of sodium nitrite and form a solution of I1- , 7 parts by weight of 2,2'-dioxy-1, 1'-dinaphthyl-ar-oetohydride in 200 parts by weight of water and 30 parts by weight of caustic soda solution of 40 'Be added Reaction acidified: The precipitated dye is filtered off with suction and dried.
The dried dye is a brown powder; he colors. Acid bath wool in post-chromed brown color. The 2'-dioxy -1 used in the above example.
1'-dinaphthyl-ar-octohydride can be obtained, for example, by treating the disodium salt of 2.2'-dioxy-1.1'-dinaphthyl in water at 110 to 130 ° C. and 30 to 35 atmospheres. with hydrogen in the presence of a nickel catalyst until the amount of hydrogen required to form the octohydride is absorbed. The melting point is 139 to 140 C.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE175241X | 1932-06-30 | ||
CH170448T | 1933-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH175241A true CH175241A (en) | 1935-02-15 |
Family
ID=25718921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH175241D CH175241A (en) | 1932-06-30 | 1933-06-28 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH175241A (en) |
-
1933
- 1933-06-28 CH CH175241D patent/CH175241A/en unknown
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