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CH175241A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH175241A
CH175241A CH175241DA CH175241A CH 175241 A CH175241 A CH 175241A CH 175241D A CH175241D A CH 175241DA CH 175241 A CH175241 A CH 175241A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
dye
weight
parts
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 CH175241A publication Critical patent/CH175241A/en

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

Description

  

  Verfahren zur Darstellung eines     Azofarbstoffes.       Gegenstand dieses Zusatzpatentes ist ein  Verfahren zur Darstellung eines     Azofarb-          stoffes,    welches darin besteht, dass man 2 .     2'-          Dioxy-1    .     1'-dinaphthyl-ar-octohydrid    mit der       Diazover        bindung    von     4-Nitro-2-aminophenol-          6-sulfosäure    kuppelt.  



  <I>Beispiel:</I>  23,4 Gewichtsteile     4-Nitro-2-aminophenol-          (i-sulfösäure    werden in 60 Gewichtsteilen       \Nasser    und 10 Gewichtsteilen konzentrierter  Salzsäure mit. 7 Gewichtsteilen Natrium  nitrit dianotiert und zu einer Lösung von       I1-,7    Gewichtsteilen 2 .     2'-Dioxy-1    .     1'-dinaph-          thyl-ar-oetohydrid    in 200 Gewichtsteilen  Wasser und 30 Gewichtsteilen Natronlauge  von 40'     Be    hinzugefügt. Nachdem die Kupp  lung beendet ist, wird mit konzentrierter  Salzsäure bis zur kongosauren Reaktion an  gesäuert. Der ausgefällte     Farbstoff    wird ab  gesaugt und getrocknet.

   Der getrocknete  Farbstoff stellt ein braunes Pulver dar; er  färbt. Wolle aus saurem Bade in     nach-          chromierter    Färbung braun.    Das nach dem obigen Beispiel verwendete  2. 2'-     Dioxy    -1 .

   1'-     dinaphthyl-ar-octohydrid     ist erhältlich beispielsweise durch Behandeln  des     Dinatriumsalzes    des     2.2'-Dioxy-1.1'-          dinaphthyls    in Wasser bei 110 bis 130   C  und 30 bis     35        Atm.        mit    Wasserstoff in Ge  genwart eines Nickelkatalysators, bis die zur  Bildung des     Octohydrids    nötige Menge Was  serstoff aufgenommen ist. Der Schmelzpunkt  liegt bei 139 bis 140   C.



  Process for the preparation of an azo dye. The subject of this additional patent is a process for the preparation of an azo dye, which consists in that one 2. 2'-dioxy-1. 1'-dinaphthyl-ar-octohydride couples with the diazo bond of 4-nitro-2-aminophenol-6-sulfonic acid.



  <I> Example: </I> 23.4 parts by weight of 4-nitro-2-aminophenol- (i-sulfoic acid are dianotized in 60 parts by weight of water and 10 parts by weight of concentrated hydrochloric acid with 7 parts by weight of sodium nitrite and form a solution of I1- , 7 parts by weight of 2,2'-dioxy-1, 1'-dinaphthyl-ar-oetohydride in 200 parts by weight of water and 30 parts by weight of caustic soda solution of 40 'Be added Reaction acidified: The precipitated dye is filtered off with suction and dried.

   The dried dye is a brown powder; he colors. Acid bath wool in post-chromed brown color. The 2'-dioxy -1 used in the above example.

   1'-dinaphthyl-ar-octohydride can be obtained, for example, by treating the disodium salt of 2.2'-dioxy-1.1'-dinaphthyl in water at 110 to 130 ° C. and 30 to 35 atmospheres. with hydrogen in the presence of a nickel catalyst until the amount of hydrogen required to form the octohydride is absorbed. The melting point is 139 to 140 C.

 

Claims (1)

PATENTANSPRUCH Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 2. 2'- Dioxy -1 .<B>l'-</B> dinaphthyl-ar-octohydrid mit der Diazoverbindung von 4 - Nitro - 2- aminopherlol-6-sulfosäure kuppelt. Der so erhaltene Farbstoff bildet nach dem Trocknen ein braunes Pulver; er färbt Wolle aus saurem Bade in nachchromierter Färbung braun. PATENT CLAIM Process for the preparation of an azo dye, characterized in that 2. 2'-dioxy -1. <B> l'- </B> dinaphthyl-ar-octohydride with the diazo compound of 4-nitro-2- aminopherlol- 6-sulfonic acid couples. The dye thus obtained forms a brown powder after drying; he dyes wool from an acid bath in a post-chromed dye brown.
CH175241D 1932-06-30 1933-06-28 Process for the preparation of an azo dye. CH175241A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE175241X 1932-06-30
CH170448T 1933-06-28

Publications (1)

Publication Number Publication Date
CH175241A true CH175241A (en) 1935-02-15

Family

ID=25718921

Family Applications (1)

Application Number Title Priority Date Filing Date
CH175241D CH175241A (en) 1932-06-30 1933-06-28 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH175241A (en)

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