DE125589C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

JVr 125589 CLASS 22 e.

In the patent specification 122570 a process for converting derivatives of β-oxy- or ß-amidonaphthalene in the corresponding ß-naphthylamine derivatives substituted on nitrogen, consisting of , that the mentioned oxy- resp. Amido compounds simultaneously or one after the other with sulfites and aromatic amines treated.

In the further course of the investigations relating to this method, the surprising observation made that the process also applies to an aromatic amine, which at the same time has the character of a dye, namely the fuchsin, which allows it to expand.

The process is explained using the following examples:

Example I.

25 kg of fuchsin are dissolved in 1000 l of hot water with 40 kg of 2 · 6 - naphthol sulfonic acid and 350 kg bisulfite solution (40 ° B.) are added and the mixture is stirred for so long heated to 90 to 100 ° until an increase in new dye can no longer be seen. A part of the fuchsin remains unchanged under these circumstances, in that it is partly separates from the solution; it can be easily separated by filtration. That new product, however, is in solution, apparently in the form of a sulfurous acid or bisulfite compound. This can easily be decomposed by hydrochloric or sulfuric acid.

Therefore, after filtering, the reaction product is poured into excess hydrochloric acid, for example and boils, whereby the sulphurous acid is driven off and an almost complete excretion of the new dye in the form dark blue flakes, which sometimes clump together like resin. One lets cool sucks off the precipitate and washes with cold dilute hydrochloric acid to about remove any remaining fuchsine; if necessary, it is done again in hot water dissolved and precipitated with small amounts of table salt. After drying and powders the dye represents a blue-black substance that is difficult to oppose in cold water Dissolves fairly abundantly in hot water, and wool in shades of blue with a vivid glow stains. Alkalis (caustic soda, soda solution or ammonia) have no noticeable Influence on the solubility, - on the other hand, the dye can through aqueous bisulfite rather easily be brought into solution, which then appears almost colorless. At the Acidification of this solution with mineral acids appears at first to be comparatively weak Blue-green color, which increases on heating and a precipitate on boiling gives way to dark blue flakes.

Example II.

25 kg of fuchsine are dissolved in 1000 l of hot water, with 40 kg of 2-amido-6-naphthalene

sulfonic acid and 350 kg Bisulfltlösung (40 ⁰ B.) was added and boiled under stirring as long as the Rückflufskühler is no longer visible to an increase in new dye. After the unchanged fuchsine has been filtered off, the filtrate, which contains the sulfurous acid or bisulfite compound of the new product, is boiled with excess hydrochloric acid and then treated further in the manner described in Example I.

Used instead of 2 · 6-naphthol sulfonic acid or the 2 6-naphthylamine sulfonic acid other β-naphthol or ß-naphthylamine derivatives, such as B. 2 6 8 -naphthol disulfonic acid, 2 7 dioxynaphthalene or 2 5 7-amidonaphthol sulfonic acid, which by the action of bisulfite in the sulfurous acid ester of ι · 6-dioxynaphthalene-3-sulfonic acid is transferred and as such enters into reaction with the fuchsin, then the process develops perfectly analogous to the one described above. The color of the fuchsin suffers as well generally a substantial shift towards blue; the resulting dyes are by; their solubility differentiated from each other. Their properties result from the following table:

Aeufseres
Appearance Solution in water violet on addition
v. Baking soda
lye on addition
from
hydrochloric acid on add
v. vinegar
acid Solution in
alcohol Solution in
sulfur
acid black
bronze
shiny
powder violet rothe
solution blueness
solution purple
solution blue-violet
solution brownish red 2 · 5 ■ 7 - amidonaphtol-
sulfonic acid blue
black
powder violet dirty
rothe
solution blueness
precipitation
respectively
solution purple
solution blueness
solution brownish red 2 x 6-naphthol sulfonic acid blue
black
powder nearly
insoluble rothe
solution blueness
solution purple
solution blue-violet
solution brownish red .2 x 6 x 8 - naphthol disulfo
acid black
bronze
shiny
powder Alcohol
rothe
solution lolish L
green-blue
precipitation Dsung
purple
solution purple
solution brownish red. 2 · 7-dioxynaphthalene

In all of these cases one can proceed in such a way that one first starts from the relevant Naphthylamine or naphthol derivatives due to the action of sulfites the associated represents β-naphthol sulfuric acid ester and this is then treated with fuchsine.

Claims (1)

Sponsorship claim:
Further development of the process of patent 122570, consisting in that derivatives of β-oxy- or β-amidonaphthalene are treated simultaneously or successively with sulfites and fuchsine.