CH141317A - Process for the preparation of a brown vat dye. - Google Patents
Process for the preparation of a brown vat dye.Info
- Publication number
- CH141317A CH141317A CH141317DA CH141317A CH 141317 A CH141317 A CH 141317A CH 141317D A CH141317D A CH 141317DA CH 141317 A CH141317 A CH 141317A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- brown
- dye
- vat dye
- air
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines braunen Nüpenfarbstoffes. Es wurde gefunden, dass man einen brau nen Küpenfarbstnff erhält, wenn man Di- benzanthrona,zin von der Formel:
EMI0001.0006
das nach dem Verfahren der Schweiz. Pa- tentsehriften Nr. 130160 und 136922 erhal ten werden kann, nach dem Reduzieren und Oxydieren mit Luft bromiert. Der neue Farbstoff ist Brom- und stickstoffhaltig, löst sich in konzentrierter Schwefelsäure mit vio letter Farbe und färbt Baumwolle aus blauer Küpe in blauen Tönen, die beim Verhängen an der Luft in ein Braun von vorzüglicher Wasch- und Sodakochechtheit und hervor- ragender Lichtechtheit übergehen,
das durch Chloren noch reiner wird. <I>Beispiel</I> 5 Teile des durch Reduktion mit Na- triumhydrosulfit und Natronlauge und nach- herigem Ausblasen aus dem Farbstoff der Schweiz. Patentschrift Nr. 130160 erhält lichen Produktes werden in. 250 Teilen Ni- trobenz-ol suspendiert und 1 Teil Eisenchlo rid und 25 Teile Brom zugegeben. Hierauf wird das Reaktionsgemisch langsam auf<B>80'</B> erhitzt und 20 Stunden bei dieser Tempera tur gehalten. Nach dem Erkalten wird der Farbstoff abgesaugt und mit Benzol, Alko hol und Wasser gewaschen.
<I>Beispiel 2:</I> 5 Teile des im Beispiel 1 beschriebenen Reduktionsproduktes werden in 125 Teilen Wasser suspendiert und hierzu 25 Teile Brom gegeben. Dann wird das Reaktionsgemisch langsam auf<B>80'</B> erhitzt, einige Stunden bei dieser Temperatur gehalten und wie üblich aufgearbeitet. Der Farbstoff hat im wesent lichen die gleichen Echtheitseigenschaften wie der des Beispiel 1.
Process for the preparation of a brown pimple dye. It has been found that a brown vat dye is obtained by using dibenzanthrona, zin of the formula:
EMI0001.0006
according to the Swiss procedure. Patent documents No. 130160 and 136922 can be obtained after being reduced and oxidized with air brominated. The new dye contains bromine and nitrogen, dissolves in concentrated sulfuric acid with a violet color and dyes cotton from a blue vat in blue tones, which, when hung in the air, turn into a brown of excellent washing and soda cooking fastness and excellent light fastness,
which becomes even purer with chlorination. <I> Example </I> 5 parts of the reduction with sodium hydrosulphite and sodium hydroxide solution and subsequent blowing out of the Swiss dye. Patent specification No. 130160 available product are suspended in. 250 parts of nitrobenz-ol and 1 part of iron chloride and 25 parts of bromine are added. The reaction mixture is then slowly heated to <B> 80 '</B> and kept at this temperature for 20 hours. After cooling, the dye is filtered off with suction and washed with benzene, alcohol and water.
Example 2: 5 parts of the reduction product described in Example 1 are suspended in 125 parts of water, and 25 parts of bromine are added. The reaction mixture is then slowly heated to 80 ', kept at this temperature for a few hours and worked up as usual. The dye has essentially the same fastness properties as those of Example 1.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE141317X | 1927-11-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH141317A true CH141317A (en) | 1930-07-31 |
Family
ID=5668601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH141317D CH141317A (en) | 1927-11-09 | 1928-10-26 | Process for the preparation of a brown vat dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH141317A (en) |
-
1928
- 1928-10-26 CH CH141317D patent/CH141317A/en unknown
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