CH154034A - Process for the preparation of a disazo dye. - Google Patents

Process for the preparation of a disazo dye.

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Publication number
CH154034A
CH154034A CH154034DA CH154034A CH 154034 A CH154034 A CH 154034A CH 154034D A CH154034D A CH 154034DA CH 154034 A CH154034 A CH 154034A
Authority
CH
Switzerland
Prior art keywords
preparation
disazo dye
yellow color
diamino
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 CH154034A publication Critical patent/CH154034A/en

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Description

  

  Verfahren     zur        Darstellung    eines     Disazofarbstoffes.       Es wurde gefunden, dass man einen neuen       Disazofarbstoff    erhält, wenn man die durch       Sulfurieren    von     4,4'-Diamino-3,3'-dimethyldi-          phenylmethan    mit     Oleum    erhältliche     Sulfo-          säure        tetrazotiert    und mit 2 Molekülen  1- (2',5'-     Dichlor    - 4'-     sulfo)    -     phenyl-3-methyl-5-          pyrazolon    kuppelt.  



  Der neue     Farbstoff    bildet ein oranges  Pulver. Er löst sich in Wasser mit grün  gelber, in konzentrierter Schwefelsäure mit  gelber Farbe und färbt und druckt Wolle  in gelben Tönen von grosser Reinheit und  guter Lichtechtheit.  



  <I>Beispiel:</I>  34 kg     4,4'-Diamino-3,        3'-dimethyldiphenyl-          methan    werden in 130 kg     Schwefelsäure-          monohydrat    bei 70 0 gelöst und bei 10   lang  sam mit 110 kg     Oleum        301/o    versetzt. Man  rührt bei 50 0, bis eine Probe in Wasser und  verdünnter     Sodalösung    klar löslich ist.

   Die  so gebildete     4,4'-Diamino-3,3'-dimethyl-di-          phenylmethandisulfosäure    kann ans der Re  aktionsmasse isoliert werden entweder durch  Verdünnen mit 4     Volumteilen    Wasser, wobei    sich die freie     Sulfosäure    abscheidet, oder als       Natronsalzlösung    durch Kalken und Umsetzen  mit Soda. Die     Sulfosäure    wird in üblicher  Weise     tetrazotiert    und mit einer wässerigen  Lösung von 97 kg     1-(2',5'-Dichlor-4'-sulfo)-          phenyl-3-methyl-5-pyrazolon    und 50 kg Soda  gekuppelt.



  Process for the preparation of a disazo dye. It has been found that a new disazo dye is obtained if the sulfonic acid obtained by sulfurizing 4,4'-diamino-3,3'-dimethyldiphenylmethane with oleum is tetrazotized and given 2 molecules 1- (2 ', 5 '- dichloro - 4'-sulfo) - phenyl-3-methyl-5-pyrazolone couples.



  The new dye forms an orange powder. It dissolves in water with a greenish yellow color, in concentrated sulfuric acid with a yellow color and dyes and prints wool in yellow tones of great purity and good lightfastness.



  <I> Example: </I> 34 kg 4,4'-diamino-3, 3'-dimethyldiphenyl methane are dissolved in 130 kg sulfuric acid monohydrate at 70 ° and slowly mixed with 110 kg oleum 301 / o at 10 . The mixture is stirred at 50 ° until a sample is clearly soluble in water and dilute soda solution.

   The 4,4'-diamino-3,3'-dimethyl-diphenylmethanedisulfonic acid thus formed can be isolated from the reaction mass either by diluting with 4 parts by volume of water, the free sulfonic acid separating out, or as a sodium salt solution by lime and reaction with Soda. The sulfonic acid is tetrazotized in the usual way and coupled with an aqueous solution of 97 kg of 1- (2 ', 5'-dichloro-4'-sulfo) - phenyl-3-methyl-5-pyrazolone and 50 kg of soda.

Claims (1)

P A TENT A NSPRT10I3 - Verfahren zur Darstellung eines Disazo- farbstoffes, dadurch gekennzeichnet, dass man die durch Sulfurieren von 4,4'-Diamino-3,3'- dimethyldiphenylmethan mit Oleum erhält liche Sulfosäure tetrazotiert und mit 2 Mo lekülen 1-(2',5'-Dichlor-4'-sulfo)-phenyl-3-me- thyl-5-pyrazolon kuppelt. Der neue Farbstoff bildet ein oranges Pulver. PA TENT A NSPRT10I3 - Process for the preparation of a disazo dye, characterized in that the sulphonic acid obtained by sulphurising 4,4'-diamino-3,3'-dimethyldiphenylmethane with oleum is tetrazotized and added with 2 molecules 1- (2 ', 5'-dichloro-4'-sulfo) -phenyl-3-methyl-5-pyrazolone couples. The new dye forms an orange powder. Er löst sich in Wasser mit grüngelber, in konzentrierter Schwefelsäure mit gelber Farbe; er färbt und druckt Wolle in gelben Tönen von grosser Reinheit und guter Lichtechtheit. It dissolves in water with a green-yellow color, in concentrated sulfuric acid with a yellow color; he dyes and prints wool in yellow tones of great purity and good lightfastness.
CH154034D 1929-08-09 1930-08-05 Process for the preparation of a disazo dye. CH154034A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE154034X 1929-08-09
CH150004T 1930-08-05

Publications (1)

Publication Number Publication Date
CH154034A true CH154034A (en) 1932-04-15

Family

ID=25715550

Family Applications (1)

Application Number Title Priority Date Filing Date
CH154034D CH154034A (en) 1929-08-09 1930-08-05 Process for the preparation of a disazo dye.

Country Status (1)

Country Link
CH (1) CH154034A (en)

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