CH190625A - Process for the preparation of a dye. - Google Patents

Process for the preparation of a dye.

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Publication number
CH190625A
CH190625A CH190625DA CH190625A CH 190625 A CH190625 A CH 190625A CH 190625D A CH190625D A CH 190625DA CH 190625 A CH190625 A CH 190625A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
acid
heating
water
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH190625A publication Critical patent/CH190625A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Darstellung eines     Farbstoffes.       Gegenstand dieses Zusatzpatentes ist ein  Verfahren zur Darstellung eines     Farbstoffes,     welches dadurch gekennzeichnet ist, dass man       4-Amino-sulfo-1.8-naphthalsäure,    die durch  Erhitzen von     4-Aminonaphthalsäure    oder deren       Anhydrid    mit einem Gemisch von     Schwefel-          säuremonohydrat        und        20        %igem        Oleum        bei     50-60 0 0, Eingiessen des Reaktionsproduktes  in Wasser, Absaugen und     Neutralwaschen,

       erhältlich ist, mit der Verbindung folgender  Formel  
EMI0001.0014     
    in-Gegenwart von     Natriumbisulfitlösung    kon  densiert.  



       Beispiel:     60 Gewichtsteile     Sulfaminonaphthalsäure,     die durch Erhitzen von     4-Aminonaphthalsäure       oder deren     Anhydrid    mit einem Gemisch von       Schwefelsäuremonohydrat    und 20     %igem        Ole-          um    bei 50-60 0 0, Eingiessen des Reaktions  produktes in Wasser, Absaugen und Neutral  waschen, erhältlich ist, und 70 Gewichts-,  teile der Verbindung folgender Formel  
EMI0001.0024     
    werden in einer Mischung von 800 Raum  teilen     Natriumbisulfitlösung    und 200 Raum  teilen Wasser etwa 12 Stunden zum Sieden  erhitzt.

   Der Farbstoff wird als hellgelber  Niederschlag abgeschieden, er wird abgesaugt,  in Wasser unter Erwärmen gelöst, filtriert  und mit verdünnter Salzsäure als flockiger,  gelber Niederschlag gefällt. Der     Farbstoff     ergibt auf Wolle gelbe, sehr echte,     nach-          chromierte    Färbungen.



  Process for the preparation of a dye. The subject of this additional patent is a process for the preparation of a dye, which is characterized in that 4-amino-sulfo-1,8-naphthalic acid, which is obtained by heating 4-aminonaphthalic acid or its anhydride with a mixture of sulfuric acid monohydrate and 20% oleum at 50-60 0 0, pouring the reaction product into water, suction and washing neutral,

       is available with the compound of the following formula
EMI0001.0014
    condenses in the presence of sodium bisulfite solution.



       Example: 60 parts by weight of sulfaminonaphthalic acid, which can be obtained by heating 4-aminonaphthalic acid or its anhydride with a mixture of sulfuric acid monohydrate and 20% oleum at 50-60 0 0, pouring the reaction product into water, suctioning off and washing neutral, and 70 parts by weight of the compound of the following formula
EMI0001.0024
    are boiled in a mixture of 800 parts of sodium bisulfite solution and 200 parts of water for about 12 hours.

   The dye is deposited as a light yellow precipitate, it is filtered off with suction, dissolved in water with heating, filtered and precipitated as a flaky, yellow precipitate with dilute hydrochloric acid. The dye produces yellow, very genuine, post-chromed dyeings on wool.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Farb stoffes, dadurch gekennzeichnet, dass man 4-Aniino-sulfo-1.8-naphthalsäure, die durch Erhitzen von 4-Aminonaphthalsäure oder deren Anhydrid mit einem Gemisch von Schwefel- säuremonohydrat und 20 %igem Oleum bei 50-600 0, Eingiessen des Reaktionsproduktes in Wasser, Absaugen und Neutralwaschen, erhältlich ist, PATENT CLAIM: Process for the preparation of a dye, characterized in that 4-aniino-sulfo-1.8-naphthalic acid, which is obtained by heating 4-aminonaphthalic acid or its anhydride with a mixture of sulfuric acid monohydrate and 20% oleum at 50-600 0, pouring the reaction product into water, suction and washing neutral, is available, mit des Verbindung folgender Formel EMI0002.0012 in Gegenwart von Natriumbisulfitlösung kon densiert. Der so erhaltene Farbstoff ergibt auf Wolle gelbe, sehr echte, nachchromierte Fär bungen. UNTERANSPRUCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man die Kondensation durch siedendes Erhitzen während mehrerer Stunden bewirkt. with the compound of the following formula EMI0002.0012 condenses in the presence of sodium bisulfite solution. The dye thus obtained gives yellow, very genuine, chromium-plated dyeings on wool. SUBCLAIM: Process according to patent claim, characterized in that the condensation is brought about by boiling heating for several hours.
CH190625D 1934-07-14 1935-07-12 Process for the preparation of a dye. CH190625A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE190625X 1934-07-14
CH186559T 1935-07-12

Publications (1)

Publication Number Publication Date
CH190625A true CH190625A (en) 1937-04-30

Family

ID=25721392

Family Applications (1)

Application Number Title Priority Date Filing Date
CH190625D CH190625A (en) 1934-07-14 1935-07-12 Process for the preparation of a dye.

Country Status (1)

Country Link
CH (1) CH190625A (en)

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