CH176037A - Process for the production of a vat dye. - Google Patents
Process for the production of a vat dye.Info
- Publication number
- CH176037A CH176037A CH176037DA CH176037A CH 176037 A CH176037 A CH 176037A CH 176037D A CH176037D A CH 176037DA CH 176037 A CH176037 A CH 176037A
- Authority
- CH
- Switzerland
- Prior art keywords
- nitrobenzene
- zinc chloride
- bromine
- isodibenzanthrone
- vat dye
- 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
- C09B3/00—Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
- C09B3/22—Dibenzanthrones; Isodibenzanthrones
- C09B3/30—Preparation from starting materials already containing the dibenzanthrone or isodibenzanthrone nucleus
- C09B3/32—Preparation from starting materials already containing the dibenzanthrone or isodibenzanthrone nucleus by halogenation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren<B>zur</B> Herstellung eines Nüpenfarbstoffes. Es wurde gefunden, dass man einen rein blau-violett färbenden Küpenfarbstoff erhält, wenn man Isodiberizanthron in iiitrobenzo- lischeni Medium im Gegenwart von minde- stens <B>5</B> % Chlorzink mit etwa 1,2 Teilen Brom bromiert. Das so erhaltene Produkt,
das einen Bromgehalt von etwa 20 1/o auf weist, bildet ein dunkles Pulver, das sich in konzentrierter Schwefelsäure mit grüner Farbe löst. Dasselbe gibt eine blaue Küpe, ans der Baumwolle in reinen violetten Tönen gefärbt wird, die blauer sind als diejenigen, die mit einem Bromierungsprodukt von gleichem Bromgehalt, das durch Bromieren des Isodi- benzanthrons in Nitrobenzol ohne Zusatz von Chlorzink hergestellt worden ist, erhalten werden.
<I>Beispiel:</I> <B>1</B> Teil reines Isodibenzanthron und 0,4 Teile wasserfreies Zinkchlorid werden in<B>16</B> Teilen trockenem Nitrobenzol unter Rühren auf<B>1800</B> erwärmt. Dann lässt man innert etwa 20 Stunden 1,2 Teile Brom, gelöst in <B>8</B> Teilen Nitrobenzol, zutropfen, unter Inrie- haltung einer Temperatur von<B>180-185'.</B> Nach beendeter Bromzugabe lässt man noch 4 Stunden nachreagieren und hierauf erkal ten.
Man saugt ab und behandelt den Nutsch- kuchen unter Zusatz von Soda mit Wasser dampf. Der nitrobenzolfreie Rückstand wird filtriert, mit Wasser, dann mit verdünnter Salzsäure und zuletzt wieder mit Wasser ausgewasclien und getrocknet.
Process <B> for </B> production of a pebble dye. It has been found that a purely blue-violet colored vat dye is obtained when isodiberizanthrone is brominated in a nitrobenzene medium in the presence of at least 5% zinc chloride with about 1.2 parts of bromine. The product thus obtained,
which has a bromine content of about 20 1 / o, forms a dark powder that dissolves in concentrated sulfuric acid with a green color. The same gives a blue vat, on which cotton is dyed in pure violet tones, which are bluer than those obtained with a bromination product of the same bromine content, which has been prepared by bromination of isodibenzanthrone in nitrobenzene without the addition of zinc chloride.
<I> Example: </I> <B> 1 </B> part of pure isodibenzanthrone and 0.4 part of anhydrous zinc chloride are mixed in <B> 16 </B> parts of dry nitrobenzene with stirring to <B> 1800 </ B > warms. Then, within about 20 hours, 1.2 parts of bromine, dissolved in 8 parts of nitrobenzene, are added dropwise while maintaining a temperature of 180-185 °. After the addition of bromine has ended leave to react for another 4 hours and then cool.
It is filtered off with suction and treated with steam with the addition of soda. The nitrobenzene-free residue is filtered, washed out with water, then with dilute hydrochloric acid and finally again with water and dried.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH176037T | 1934-05-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH176037A true CH176037A (en) | 1935-03-31 |
Family
ID=4426665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH176037D CH176037A (en) | 1934-05-19 | 1934-05-19 | Process for the production of a vat dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH176037A (en) |
-
1934
- 1934-05-19 CH CH176037D patent/CH176037A/en unknown
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