CH221176A - Process for the preparation of a stilbene dye. - Google Patents

Description

  

  <B> Additional patent </B> to main patent no. 217234. Process for the production of a stilbene dye. The subject of the present patent is a process for the production of a stilbene dye, characterized in that 4-amino-2-methoxy-2'-oxy-5'-nitro-1,1'-azobenzene-3'-sulfonic acid,

      for example, ordered by coupling diazotized 4-nitro -2 - amino -1-oxybenzene -6- sulfonic acid with m-anisidine, with or without pressure with 4,4'-dinitrostilbene-2,2'-disulfonic acid condensed and the condensation product is converted into the copper lacquer with copper-releasing agents.



  The new dye is a dark powder when dried; it dissolves in water with a reddish brown color, in concentrated sulfuric acid with a blue color and dyes cotton in very lightfast deep brown tones.



       Example <I> 1 </I> 73.6 parts of the dye, prepared by coupling diazotized 4-nitro-2-amino-1-oxybenzene-6-sulphonic acid with m-anisidine in weakly lacquer acid Solution, with 95 parts of 4,4'-dinitros @ tilben-2.2'-diisulfosaurem sodium in 500 parts of water and 100 parts of sodium hydroxide solution of 36 Be 18 hours in a stirred tank or stirred autoclave at 100 to 105 '</ B> condensed.

    After the sodium hydroxide solution has been blunted with hydrochloric acid, the dye is salted in house and filtered.



  The still moist filter cake is dissolved in about 3000 parts of water at 80 and with an ammoniacal copper sulphate solution made from 50 parts of crystallized copper sulphate, dissolved in 200 parts of water and 150 parts of 25% ammonia , 6 hours at 80 to <B> 90 '</B> coppered. It is checked that there is an excess of copper right up to the end. The copper compound is salted out and filtered.

    <I> Example 2: </I> 73.6 parts of the dye, prepared by coupling diazotized 4-nitro-2-amino-1-oxybenzene-6-sulfonic acid with m-aniside, are 47.4 parts Share 4,4'-dinitro-stilbene-2,

  2'-sodium sulphate in 500 parts of water and 100 parts of sodium hydroxide solution of 36 'B6 condensed for 18 hours in a stirred tank or stirred autoclave at 100 to 105' '. After the sodium hydroxide solution has been blunted, the dye is salted out with hydrochloric acid and filtered.



  The still moist filter cake of the dye is dissolved in about 3000 parts of water at 80 and treated with an ammoniacal copper sulfate solution, obtained from 50 parts of crystallized copper sulfate, dissolved in 200 parts of water and 150 parts of <I> 25 </I>, 30% ammonia, 6 hours at 80 to 90 coppered. The copper connection will. salt out and filter.



  The new dye is a dark powder when dried; it dissolves in water with a reddish brown color, in concentrated sulfuric acid with a blue color and dyes cotton in very lightfast deep brown tones.

 

Claims (1)

PATENT CLAIM: Process for the production of a stilbene dye, characterized in that 4-amino-2-methoxy-2'-oxy-5'-nitro-1,1'-azobenzene-3'-sulfonic acid is mixed with 4,4'- Dinitro stilbene-2,2'-clisulfoiisiure condenses and the condensation product obtained is converted into the copper lacquer with copper-releasing agents. The new dye stelli. when dried it is a dark powder, it dissolves in @ Ta.sser with roi-brown egg, in concentrated sulfuric acid with. blue color and dyes cotton in very light, deep brown tones. SUBClaim: Method according to patent claim, characterized in that the production of the stilbene dye is carried out in the pressure vessel.