CH209641A - Process for the preparation of a solid diazonium salt. - Google Patents

Description

  

  Process for the preparation of a solid diazonium salt. It has been found that, from solutions of diazonium salts by treatment with cobalt chloride or another cobalt salt in the presence of chlorine ions, cobalt chlorine double salts of the diazonium compounds in question can be obtained in solid form. The solid diazonium salts obtained in this way have a good shelf life and good solubility.



       Diazonium double salts with cobalt chloride are not yet known. It is also quite surprising that diazonium compounds are precipitated by means of cobalt chloride, especially since solid diazonium double salts cannot be obtained with the aid of the corresponding salts of nickel, which is very close to cobalt.

   The new cobalt chloride double salts can be mixed with the usual thinners or adjusting agents and processed into valuable, durable diazo salts.



       The subject of the present patent is a process for the production of a solid diazonium salt, which is characterized by the fact that from a mineral acidic diazo solution of 1-amino-2-phenogy-5-chlorobenzene with cobalt chlorine the cobalt chlorine double salt of the diazonium compound is in solid form Form separates.

      <I> Example: </I> 200 parts by weight of 1-amino-2-phenogy-5-chlorobenzene are added to 591.3 parts by weight of 22.5 weight percent hydrochloric acid. After the chlorohydrate formation, the mixture is cooled to 0 C and mixed with 74 parts by weight of ice.

   The diazotization takes place by adding 165 parts by weight of a 40 weight percent sodium nitrite solution at <B> 10-15'C. </B> After the diazonium solution has been filtered, the cobalt chloride double salt is converted by adding a solution of 111.1 parts by weight of cobalt chloride (CoC12. 6 H20) precipitated in 100 parts by weight of water.

   To completely separate out the salt, 130 parts by weight of table salt are added. The iobalt chloride double salt obtained is filtered off with suction and dried.



  It is a green, crystalline powder that is stable and has good solubility. By mixing it with the usual dyeing auxiliaries, such as anhydrous sodium sulfate or partially dewatered aluminum sulfate, etc., it can be adjusted to the commercially available form.

 

Claims (1)

PATENT CLAIM: A process for the production of a solid diazonium salt, characterized in that a mineral acid diazo solution of 1-amino-9-phenogy-5-chlorobenzene with Iioba.ltchlorür separates the double salt of the diazonium compound in solid form. The diazonium salt obtained in this way is a green, crystalline powder which is easy to hold and has good solubility. By mixing it with the usual dyeing auxiliaries such as anhydrous sodium sulphate or partially dehydrated aluminum sulphate, etc., it can be adjusted to the commercially available form.