CH205067A - Process for the preparation of an anthraquinone dye. - Google Patents

Description

  

      Additional patent to main patent no. 199189. 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-dodecylaniline-2-phenoxyanthraquinone disulfonic acid.

       According to the present invention, the same anthraquinone dye is prepared by adding phenol to a 2-halo-1-amino-4-do, d, ecylanilinanthraohinonsulfo @ acid, such as can be obtained by sulfonating 2 halo-1-amino-4 -p-dodecylanilinanthrachinon with weak oleum, allowed to act and sulfonated the compound obtained.



  The 2-halo-1-amino- @ 4-p- @ dod.ecylaniline-anthraquinonic @ sulfonic acid used can be 2-bromo-1-amino-4-p-, dodecylaniline anthraquinocisulfonic acid.



  The treatment with the phenol can expediently take place by heating with an alkali metal salt of the phenol in excess phenol. The sulfonic run "o" can conveniently be carried out by dissolving it in 100% sulfuric acid and adding oleum.



       The dye is a violet-blue substance that dissolves in concentrated sulfuric acid with a reddish-violet color: With water, it gives clear blue solutions that easily foam. The dye dyes wool in vivid reddish blue tones, which are very good boiled and lightfastness onw.ei@s-en and withstand intensive washing very well.



  <I> Example; </I> They are heated together for 61 hours at 170-175 ° C, 70 parts of 2-bromo-1-amino-4-p-, dod-ecylaniline anthraquinonesulphonic acid (as the sodium salt) as they are can be obtained by sulfonating 2, bromine-1 = amino-4-p- .dodecylaniline anthraquinone (verigl. Example 1 of British Patent 443776)

   with weak oleum, 10 parts of powdered caustic soda and 3'50 parts of phenol. The reaction.gemis.ch is poured into 2:50 parts of 5% sodium hydroxide solution at 80.degree. C., the precipitated phenoxy compound is filtered off, washed with cold water and dried at 80-100.degree.



  50 parts of the 1-amino-4-p-dodecylaniline-2: -phenoxyanthraquinone monosulfonic acid thus obtained are dissolved in 500 parts of 100% sulfuric acid at 15-20 ° C. and 10 parts of 20% iges oleum are added. After a few minutes, the sulfonation mixture is poured into 2000 parts of ice water, the product is filtered off and the filter cake is neutralized in 3000 parts of water with soda.

   The dye is then precipitated at 70 ° C with 3.00 parts of sodium chloride, filtered off and dried at 80 ° C.

 

Claims (1)

PATENT CLAIM: Process for the preparation of 1-amino-4- p-, dodecylaniline-2-phenoxyanthraeliinone disulfonic acid, characterized in that phenol is converted to a 2-halogen-1-amino-4-p-d.odecylaniline antiliraeliinone sulfonic acid as it can be obtained by sulfonating 2-halo-1-amino-4-.dodecylaniline anthraquinone with weak oleti, n, allowing to act and sulfonating the compound thus obtained. The dye is a violet-blue substance, which dissolves in concentrated sulfuric acid with reddish-violet parbe and gives clear blue solutions with water, which foam easily. The dye dyes wool in lively reddish-blue shades that are very boiled and lightfast and withstand intensive washing very well. SUBClaims 1. Vex process according to claim, characterized in that the 2-halo-1-amino-4-p-dodecylaniline anthraquinone sulfonic acid used is 2-bromo-1-amino-4-p-dodecylaniline anthraquinone sulfonic acid. 2. The method according to claim, characterized in that the treatment with phenol is carried out by heating with an alkali metal salt of phenol in excess phenol. 3. The method according to claim, characterized in that the sulfonation is effected by heating with 100% sulfuric acid and adding oleum.