DE367862C - Process for the preparation of azo dyes - Google Patents

Process for the preparation of azo dyes

Info

Publication number
DE367862C
DE367862C DEF49234D DEF0049234D DE367862C DE 367862 C DE367862 C DE 367862C DE F49234 D DEF49234 D DE F49234D DE F0049234 D DEF0049234 D DE F0049234D DE 367862 C DE367862 C DE 367862C
Authority
DE
Germany
Prior art keywords
parts
weight
acid
preparation
azo dyes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEF49234D
Other languages
German (de)
Inventor
Dr Carl Heidenreich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Farbenfabriken Vorm Friedr Bayer and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Farbenfabriken Vorm Friedr Bayer and Co filed Critical Farbenfabriken Vorm Friedr Bayer and Co
Priority to DEF49234D priority Critical patent/DE367862C/en
Application granted granted Critical
Publication of DE367862C publication Critical patent/DE367862C/en
Expired legal-status Critical Current

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
    • C09B29/00—Monoazo dyes prepared by diazotising and coupling
    • C09B29/10—Monoazo dyes prepared by diazotising and coupling from coupling components containing hydroxy as the only directing group
    • C09B29/12—Monoazo dyes prepared by diazotising and coupling from coupling components containing hydroxy as the only directing group of the benzene series
    • C09B29/14—Hydroxy carboxylic acids

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Description

Verfahren zur Darstellung von Azofarbstoffen. Gelbe Azofarbstoffe vorn wertvollen Eigenschaften werden,, wie gefunden wurde, erhalten, wenn diazotierte p-Phenylendiamin-2.6-disulfosäur.e mit Salizylsäure oder Kreso= tinsäure gekuppelt wird. Diese Farbstoffe sind graugelbe biss violette Pulver, .die sich leicht in Wasser lösen und mit Chromacefat auf Baumwolle gedruckt, grünstichig gelbe Töne von großer KI4rheit und sehr guter Seifen-und Chlorechtheit hervorbringen. Ferner eignen: sich diese Farbstoffe zur Herstellung klarer gelber Lackfarben, die mit Methylenblau lebhafte Grüntöne von guter Lichtechtheit geben. B-eispieL. 29,o Gewichtsteile Mononatriumsalz der p-Phenylendiamin-2.6,d@isulfosäure werden .in i2o Gewichtsteilen Wasser gelöst, mit 15 Gewichtsteilen Salzsäure von 3o Prozent versetzt und mit Eis auf io° =abgekühlt. Dazu -gibt man eine Lösung von 6,g,Gewichtsteilen Natriumnitrit in 35 Gewichtsteilen Wasser. Die ausgeschiedene Säure geM erst @in Lösung; gleich darauf scheidet sich, die Diazoverbindung in gelblichweißen Blättchen aus. Zu diesem Brei fügt man eine kalte Lösung von 14,o Gewichtsteilen Salizylsäure :in ioo Gewichtsteilen Wasser und der nötigen, Menge Natronlauge, kühlt die Mischung mit Eis auf o° ab und läßt im Laufe einer Stunde eine ioprozentige Lösung von io Gewichtsteilen Ätznatron unter Rühren einfließen,. Man läßt einige Stunden rühren; und setzt,dann soi lange konzentrierte Salzsäure zu, bis eine dieutliche Blaufärbung von Congo das Vorhandensein freier Salzsäure anzeigt. Der -Farbstoff scheidet sich aus; er wird abgesaugt und getrocknet. Er stellt j e nach der Menge freier Salzsäure, mit der er getrocknet wurde, ein gelbes oder auch dünkelviolettes Pulver :d'ar. Es löst sich leicht ,in Wasser mit gelber Farbe.Process for the preparation of azo dyes. Yellow azo dyes Precious properties are, as has been found, retained when diazotized p-Phenylenediamine-2,6-disulfonic acid coupled with salicylic acid or creso = tinic acid will. These dyes are gray-yellow to purple powders that easily turn into Dissolve water and print on cotton with Chromacefat, greenish yellow tones of great clarity and very good soap and chlorine fastness. Further suitable: these dyes are used to produce clear yellow lacquer colors with Methylene blue gives lively green tones with good lightfastness. Example. 29, o parts by weight The monosodium salt of p-phenylenediamine-2.6, d @ isulphonic acid, in 12 parts by weight Dissolved water, mixed with 15 parts by weight of hydrochloric acid of 3o percent and with ice to io ° = cooled down. A solution of 6 g parts by weight of sodium nitrite is added in 35 parts by weight of water. The precipitated acid is only in solution; same then the diazo compound separates out in yellowish-white leaflets. To this A cold solution of 14.0 parts by weight of salicylic acid is added to the pulp: in 100 parts by weight Water and the necessary amount of caustic soda, cool the mixture with ice to 0 ° and leaves an 10 percent solution of 10 parts by weight of caustic soda in the course of an hour pour in with stirring. The mixture is left to stir for a few hours; and sits, then for so long concentrated hydrochloric acid until the Congo is clearly blue indicates free hydrochloric acid. The dye separates out; he is sucked off and dried. It depends on the amount of free hydrochloric acid with which it is dried became, a yellow or dark purple powder: d'ar. It comes off easily in Water of yellow color.

Verwendet man in diesern,Beispiel an Stelle von 14,o Gewichtsteilen Salizylsäure 15,5 Gewichtsteile o-Kresotinsäure, so, erhält man einen Farbstoff von ganz ähnlichen Eigenschaften.If one uses in this example instead of 14. o parts by weight Salicylic acid 15.5 parts by weight of o-cresotinic acid, like this, a dye is obtained of very similar properties.

Claims (1)

PATENT-ANSPRUCFI: Verfahren zur Darstellung von Azofarbstoffen, darin bestehend;, daß man diazotierte i.4-Phenyliendiam;in-2.6-disulfosäure mit Salizylsäure oder Kresotinsäure kuppelt.PATENT-ANSPRUCFI: Process for the preparation of azo dyes, therein consisting; that one diazotized i.4-phenylenediamine; in-2.6-disulfonic acid with salicylic acid or cresotinic acid couples.
DEF49234D 1921-05-05 1921-05-05 Process for the preparation of azo dyes Expired DE367862C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF49234D DE367862C (en) 1921-05-05 1921-05-05 Process for the preparation of azo dyes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF49234D DE367862C (en) 1921-05-05 1921-05-05 Process for the preparation of azo dyes

Publications (1)

Publication Number Publication Date
DE367862C true DE367862C (en) 1923-01-27

Family

ID=7102846

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF49234D Expired DE367862C (en) 1921-05-05 1921-05-05 Process for the preparation of azo dyes

Country Status (1)

Country Link
DE (1) DE367862C (en)

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