CH135478A - Process for the preparation of a new dye. - Google Patents
Process for the preparation of a new dye.Info
- Publication number
- CH135478A CH135478A CH135478DA CH135478A CH 135478 A CH135478 A CH 135478A CH 135478D A CH135478D A CH 135478DA CH 135478 A CH135478 A CH 135478A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- dye
- new dye
- blue
- new
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung eines nenen Farbstoffes. Es wurde gefunden, dass man einen neuen wertvollen Farbstoff erhalten kann, wenn man Naplitazarin in Gegenwart von redu zierenden Mitteln, z. B. Zinkstaub, mit blono- methylamin behandelt.
Der so erhältliche Farbstoff bildet dunkle, metallisch glänzende Kristallnadeln vom Schmelzpunkt 224-9226", ist in wässeriger Natronlauge unlöslich und gibt mit konzen trierter Schwefelsäure eine orangegefärbte Lösung, die auf Zusatz von Formaldehyd eine blaue Farbe annimmt; in organischen Lösungsmitteln löst ei> sich leicht mit blau grüner Farbe.
Der neue Farbstoff lässt sich mit Vorteil zur Erzeugung von Färbungen auf Cellulose- estern und ferner als Ausgangsprodukt für die Herstellung anderer Farbstoffe verwenden. Beispiel: 10 Teile Naphtazarin werden mit 75 Teilen einer 30 %igen wässerigen Monomethy lamin- Lösung unter Zusatz von 1 Teil Zinkstaub im verschlossenen Gefäss 20 Stunden unter Rübren auf<B>60'</B> erhitzt. Das ausgeschiedene Reaktionsprodukt wird abgesaugt und mit kaltem Wasser gewaschen.
Es kann durch Auskochen mit Monochlorbenzol von schwerer löslichen Nebenprodukten getrennt werden. Aus dem durch Eindampfen der 1llonochlor- benzollösung erhaltenen Rohprodukt gewinnt man den reinen Farbstoff durch Kristallisation aus Eisessig oder Sublimation irn Hochvakuum.
Process for the preparation of a new dye. It has been found that a new valuable dye can be obtained if you naplitazarin in the presence of reducing agents such. B. zinc dust, treated with blonomethylamine.
The dye that can be obtained in this way forms dark, metallic, shiny crystal needles with a melting point of 224-9226 ", is insoluble in aqueous sodium hydroxide solution and, with concentrated sulfuric acid, gives an orange-colored solution that takes on a blue color when formaldehyde is added; it dissolves easily in organic solvents with blue green color.
The new dye can advantageously be used to produce colorations on cellulose esters and also as a starting product for the production of other dyes. Example: 10 parts of naphtazarine are heated with 75 parts of a 30% strength aqueous monomethylamine solution with the addition of 1 part of zinc dust in a closed vessel for 20 hours while stirring to <B> 60 '</B>. The precipitated reaction product is filtered off with suction and washed with cold water.
It can be separated from less soluble by-products by boiling with monochlorobenzene. The pure dye is obtained from the crude product obtained by evaporation of the monochlorobenzene solution by crystallization from glacial acetic acid or sublimation in a high vacuum.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE135478X | 1927-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH135478A true CH135478A (en) | 1929-09-30 |
Family
ID=5665980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH135478D CH135478A (en) | 1927-06-27 | 1928-05-15 | Process for the preparation of a new dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH135478A (en) |
-
1928
- 1928-05-15 CH CH135478D patent/CH135478A/en unknown
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