CH155458A - Process for the preparation of a brown wool dye. - Google Patents

Process for the preparation of a brown wool dye.

Info

Publication number
CH155458A
CH155458A CH155458DA CH155458A CH 155458 A CH155458 A CH 155458A CH 155458D A CH155458D A CH 155458DA CH 155458 A CH155458 A CH 155458A
Authority
CH
Switzerland
Prior art keywords
dye
acid
brown
preparation
yellow
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
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 Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH155458A publication Critical patent/CH155458A/en

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

Description

  

      Verfahren    zur Darstellung     eines    braunen Wollfarbstoffes.    Die vorliegende Erfindung betrifft ein  Verfahren zur Darstellung eines braunen  Wollfarbstoffes, welches dadurch gekennzeich  net ist, dass     3.5-Dinitro-2-chlorbenzoesäure     und     Hydrazin    in einem organischen Lösungs  mittel bei Siedetemperatur zusammen kon  densiert werden.  



  Der neue Farbstoff bildet eine gelbe,  kristalline     Farbstoffsäure,    unlöslich in kaltem,  wenig löslich mit gelbbrauner Farbe in heissem  Wasser; in Alkalien löst er sich leicht tief  braun.     Konzentrierte    Schwefelsäure nimmt  den Farbstoff farblos auf. Das     Natriumsalz          bildettiefbraunschwarze,    grünlich schimmernde  feine Prismen.  



  <I>Beispiel:</I>  In     methylalkoholischer    Lösung lässt man  50 Gewichtsteile     Hydrazinhydrat    und 246  Gewichtsteile     3.5-Dinitro-2-chlorbenzoesäure     in Gegenwart von 136 Gewichtsteilen     kristal-          ilisertem        Natriumacetat    bei     Siedeterüperatur       aufeinander einwirken. Nach kurzer Zeit hat  sich der gebildete Farbstoff als schwarzbraune  kristalline lasse ausgeschieden. Das Natrium  salz kristallisiert aus Wasser in feinen dun  kelbraunen Nadeln; die freie     Farbstoffsäure     bildet aus Eisessig umkristallisiert derbe gelbe  Kristalle.



      Process for the preparation of a brown wool dye. The present invention relates to a process for the preparation of a brown wool dye, which is characterized in that 3,5-dinitro-2-chlorobenzoic acid and hydrazine are condensed together in an organic solvent at the boiling point.



  The new dye forms a yellow, crystalline dye acid, insoluble in cold, slightly soluble with a yellow-brown color in hot water; in alkalis it dissolves easily in a deep brown color. Concentrated sulfuric acid absorbs the dye colorless. The sodium salt forms deep brown-black, greenish shimmering fine prisms.



  <I> Example: </I> In a methyl alcoholic solution, 50 parts by weight of hydrazine hydrate and 246 parts by weight of 3,5-dinitro-2-chlorobenzoic acid are allowed to act on one another in the presence of 136 parts by weight of crystallized sodium acetate at boiling temperature. After a short time, the dye formed has precipitated as black-brown crystalline leaves. The sodium salt crystallizes from water in fine dark brown needles; the free dye acid forms solid yellow crystals recrystallized from glacial acetic acid.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines braunen Wollfarbstoffes, dadurch gekennzeichnet, dass 3.5-Dinitro-2-chlorbenzoesäure und Hydrazin in einem organischen Lösungsmittel bei Siede temperatur zusammen kondensiert werden. Der neue Farbstoff bildet eine gelbe, kristalline Farbstoffsäure, unlöslich in kaltem, wenig löslich mit gelbbrauner Farbe in heissere Wasser; in Alkalien löst er sich leicht tief braun. Konzentrierte Schwefelsäure nimmt den Farbstoff farblos auf. Das Natriumsalz bildet tiefbraunschwarze,grünlich schimmernde feine Prismen. ÜNTERANSPRtrCHE 1. PATENT CLAIM: Process for the preparation of a brown wool dye, characterized in that 3,5-dinitro-2-chlorobenzoic acid and hydrazine are condensed together in an organic solvent at boiling temperature. The new dye forms a yellow, crystalline dye acid, insoluble in cold, slightly soluble with a yellow-brown color in hot water; in alkalis it dissolves easily in a deep brown color. Concentrated sulfuric acid absorbs the dye colorless. The sodium salt forms deep brown-black, greenish shimmering fine prisms. UNDER CLAIMS 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass dieReaktion inMethyl- alkohol als organisches Lösungsmittel durchgeführt wird. . 2. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Reaktion bei Gegen wart eines säurebindenden Mittels durch geführt wird. Process according to patent claim, characterized in that the reaction is carried out in methyl alcohol as the organic solvent. . 2. The method according to claim, characterized in that the reaction is carried out in the presence of an acid-binding agent.
CH155458D 1930-07-28 1931-07-28 Process for the preparation of a brown wool dye. CH155458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE155458X 1930-07-28

Publications (1)

Publication Number Publication Date
CH155458A true CH155458A (en) 1932-06-30

Family

ID=5677027

Family Applications (1)

Application Number Title Priority Date Filing Date
CH155458D CH155458A (en) 1930-07-28 1931-07-28 Process for the preparation of a brown wool dye.

Country Status (1)

Country Link
CH (1) CH155458A (en)

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