CH205068A - Process for the preparation of an anthraquinone dye. - Google Patents

Description

  

  Additional patent to the main patent no. 199190. Process for the production of an anthraquinone dye. The main patent describes a process for the production of a new anthraquinone dye, namely 1-amino-4-p-cetylaniline-2-phenogyanthraquinone disulfo, acid. According to the present invention, the same is made:

      Dye produced by phenol on a 2-Ha1, ogen-, 1-amino-4rp-oetyla, niline anthraquinone sulfonic acid, as it can be obtained by sulfonating 2-halo-1-amino-4-p-cetylaniline anthraquinones with weak. Let oleum act and the compound obtained sulfeniert.



  As 2I-halo-1-amino-4-p-cetylaniline-anthraquinone sulfonic acid, 2, -Bromo-1-amino-4-csstylamilinanthraquinone sulfonic acid can be used.



  The treatment with the phenol can take place in two ways by heating with an alkali metal salt of the phenol in an excess of the phenol. The sulfonation can conveniently be brought about by dissolving in 1001% sulfuric acid and adding oleum.



  The dye is a violet-blue substance that dissolves in concentrated sulfuric acid with a reddish-violet color and, when mixed with water, gives clear blue solutions that foam slightly. The dye produces lively reddish-blue tones on wool, which are very fast and lightfast and are intense. Wash very well, resist.

         Example: 70 parts of 2.-bromo-1-amino-4-p-cetylaniline-anth-tachinone sulfonic acid (as sodium salt), as described in. Example 1 of British Patent No.

       443,776, using p-cetylaniline instead of p-D'o, decylaniline, and subsequent sulfonation with weak oleum, can be obtained, 10 parts of powdered caustic soda and 350 parts of phenol,

          heated together for 6 hours to 170 to 176 ° C. The reaction mixture is poured at 80 ° C. into 260 parts of 5% sodium hydroxide solution, the precipitated phenoxy compound is filtered off, washed with cold water and dried at 80 ° C.



  50 parts of the 1-amino-4-p-cetylaniline-2-phenoxyanthraquinone sulfonic acid obtained in this way are dissolved in 500 parts of 100% sulfuric acid at 15-2.0 C and 1.0 part of 20% oleum is added. After a few minutes, the sulfonation mixture is poured into 2000 parts of ice water, the product is filtered off, the filter cake is dissolved in 300 parts of water and this solution is neutralized with soda.

    The dye is then precipitated at 70 ° C. with 300 parts of sodium chloride, filtered off and dried at 80 ° C.

 

Claims (1)

PATENT CLAIM: Process for the production of 1-amino-4 -. p - oetylaniline - 2 - phenoxyanthraquinone disulfonic acid, characterized in that that one phenol on a 2-halogen-l-a.mino-4-p-oetyl-anilinanthra.chinonsulfosäurs. as can be obtained by sulfonating 2-halo-1'-amino-4-p-getylaniline anthraquinone with weak oleum and sulfonating the compound obtained. The dye is a violet-blue substance which dissolves in concentrated sulfuric acid with a reddish-violet color and gives water-clear, blue solutions that foam easily. The dye produces lively reddish-blue tones on wool, which have very good boiling and lightfastness and are very resistant to intensive washing. SUBCERTAIN 1. Process according to claim, characterized in that the 2-halo-1-amino-4-p-oetylaniline anthraquinone sulfonic acid used is 2 bromo-1-amirio-4-p-oetylaniline anthraquinone sulfonic acid. 2. The method according to claim, characterized in that the treatment with phenol is done by heating with an alkali metal salt of phenol in excess phenol. 3. Process according to the patent claim, characterized in that the sulfonation is effected by heating with 100% sulfuric acid and adding oleum.