CH215075A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH215075A
CH215075A CH215075DA CH215075A CH 215075 A CH215075 A CH 215075A CH 215075D A CH215075D A CH 215075DA CH 215075 A CH215075 A CH 215075A
Authority
CH
Switzerland
Prior art keywords
oxalic acid
azo dye
preparation
parts
diazo
Prior art date
Application number
Other languages
German (de)
Inventor
Gesellschaft Fuer Chemis Basel
Original Assignee
Chem Ind Basel
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 Chem Ind Basel filed Critical Chem Ind Basel
Publication of CH215075A publication Critical patent/CH215075A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/08—Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Herstellung eines Azofarbstoffes.    Es wurde gefunden, dass man einen neuen,  wertvollen Azofarbstoff erhält, wenn man  Dioxäthylamino- 3 -acetylamino- 6     -methoxy-          benzol,    die Diazoverbindung des     1-Amino-2-          cyan-4-nitrobenzols    und Oxalsäure derart  aufeinander einwirken lässt, dass der saure  Oxalsäureester der Dioxäthylaminogruppe  entsteht und der Diazorest in 4-Stellung zur  tertiären Aminogruppe eintritt.  



  Der so erhaltene Farbstoff bildet ein  dunkles Pulver, das sich in Wasser mit blauer  Farbe löst und das Acetatkunstseide aus  wässriger Lösung in demselben Tone färbt.  



       Beispiel:     171 Teile 1-Amino-2-cyan-4-nitrobenzol  werden in 1000 Teilen konzentrierter Schwe  felsäure mit 73,5 Teilen Natriumnitrit wie  üblich diazotiert. Diese klare Lösung gibt  man direkt unter Rühren und ständigem  Kühlen zu einer wässrigen Lösung des     Oxal-          säureesters    des Dioxäthylamino-3-acetylamino-    6-methoxybenzols, die wie folgt bereitet wird:  268 Teile     Dioxäthylamino-3-acetylamino-6-          methoxybenzol    werden mit 117 Teilen was  serfreier Oxalsäure derart in siedendem Toluol  behandelt, dass das sich bildende Wasser wäh  rend der Reaktion entfernt wird.

   Durch Aus  schütteln der Toluollösung mit einer Lösung  von 180 Teilen konzentrierter wässriger Am  moniaklösung in 2000 Teilen Wasser wird die  zur Farbstoffherstellung geeignete wässrige  Lösung des Ammoniumsalzes des Esters er  halten. Nachdem die schwefelsaure     Diazo-          lösung    eingetragen ist, neutralisiert man mit  2600 Teilen 30%iger Natriumhydroxyd  lösung. Der Farbstoff wird abfiltriert und  mit kaltem Wasser ausgewaschen.



  Process for the preparation of an azo dye. It has been found that a new, valuable azo dye is obtained when dioxäthylamino- 3 -acetylamino- 6-methoxybenzene, the diazo compound of 1-amino-2-cyano-4-nitrobenzene and oxalic acid can act on one another in such a way that the acidic oxalic acid esters of the dioxethylamino group are formed and the diazo radical is in the 4-position relative to the tertiary amino group.



  The dye thus obtained forms a dark powder which dissolves in water with a blue color and dyes the acetate rayon from aqueous solution in the same shade.



       Example: 171 parts of 1-amino-2-cyano-4-nitrobenzene are diazotized in 1000 parts of concentrated sulfuric acid with 73.5 parts of sodium nitrite as usual. This clear solution is added directly with stirring and constant cooling to an aqueous solution of the oxalic acid ester of dioxäthylamino-3-acetylamino-6-methoxybenzene, which is prepared as follows: 268 parts of dioxäthylamino-3-acetylamino-6-methoxybenzene are mixed with 117 Share what serfreier oxalic acid treated in boiling toluene in such a way that the water that forms is removed during the reaction.

   By shaking the toluene solution with a solution of 180 parts of concentrated aqueous ammonia solution in 2000 parts of water, the aqueous solution of the ammonium salt of the ester suitable for dye production will be obtained. After the sulfuric acid diazo solution has been added, it is neutralized with 2600 parts of 30% sodium hydroxide solution. The dye is filtered off and washed out with cold water.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines neuen, wertvollen Azofarbstoffes, dadurch gekenn zeichnet, dass man Dioxäthylamino-3-acetyl- amino-6-methoxybenzol, die Diazoverbindung des 1-Amino-2-cyan-4-nitrobenzols und Oxal- säure derart aufeinander einwirken lässt, (lass der saure Oxalsäureester der Dioxäthylamino- gruppe entsteht und der Diazorest in 4-Stel- lung zur tertiären Aminogruppe eintritt. Der so erhaltene Farbstoff bildet ein dunkles Pulver, das sich in Wasser mit blauer Farbe löst und das Acetatkunstseide aus wässriger Lösung in demselben Tone färbt. PATENT CLAIM: Process for the production of a new, valuable azo dye, characterized in that dioxäthylamino-3-acetylamino-6-methoxybenzene, the diazo compound of 1-amino-2-cyano-4-nitrobenzene and oxalic acid act on one another in this way (Let the acid oxalic acid ester of the dioxäthylaminogruppe arise and the diazo radical enters in the 4-position to the tertiary amino group. The resulting dye forms a dark powder that dissolves in water with a blue color and the acetate rayon from aqueous solution in the same tone.
CH215075D 1939-11-15 1939-11-15 Process for the preparation of an azo dye. CH215075A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH215075T 1939-11-15
CH213430T 1939-11-15

Publications (1)

Publication Number Publication Date
CH215075A true CH215075A (en) 1941-05-31

Family

ID=25725446

Family Applications (1)

Application Number Title Priority Date Filing Date
CH215075D CH215075A (en) 1939-11-15 1939-11-15 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH215075A (en)

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