The Manufacture of New Coloring Matters or Dyes
Year: 1892

page_text: Date of Application, 9th Mar., 1892-Accepted, 16th Apr., 1892
5
The Manufacture of New Coloring Matters or Dyes.
I, PROSPER MONNET, of St. Fons near Lyons, France Manufacturer, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement
The object of this invention is to manufacture new coloring matters or dyes
which may appropriately be called "Anisolines," from the bodies known as
"Rhodamines." These rhodamines enn-be-obtained by several-processes-and--form
sults-the-general formula of which is:-

page_text: henzyle (CA-CH)-that-I-have-sneeeeded-in-forming-my-new-colouring-matters
or-dres-the-constitution-of-which-is-

page_text: EXAMPLE OF THE FIRST STAGE IN THE PREPARATION OF THE POTASSIUM SALT OF AN
ANISOLINE FROM RHODAMINE.
The hydrochlorate of dimethyle-meta-amido-phenol-phtaleine is transformed into
a-potassium-salt an intermediate body.
Dissolve 10 kilogrammes of hydrochlorate of dimethyle-meta-amido-phenol-phtaleine
in 50 litres of boiling water, pour this. solution into another boiling solution of
kilogrammes of caustic potass dissolved in 20 litres of water. The potassium-salt
body which is immediately precipitated in the crystalline state, is more soluble cold
than hot; it is separated by filtration of its boiling solution, drained and dried.
About 10 kilogrammes of potassium-salt is obtained.
TRANSFORMATION INTO ANISOLINE.
Six kilogramines of potassium-salt-of the body so obtained from dimethyle-meta-
amido-phenol-phtaleine or the corresponding quantity of a-salt-of the body similarly
obtained from another amido-phenol-phtaleine or meta-amido-cresol-phtaleine dime-
thylated or diethylated &c. 20 kilogrammes of ethylic alcohol at 93 centesimal and
3 kilogrammes of chloride of ethyle or its equivalent of chloride of methyle or
of a bromide or an iodide, or the equivalent of chloride of benzyle, are heated under
pressure for 4 hours at a temperature exceeding 100° Centigrade, preferably at
about 120°.
After cooling the product withdrawn from the autoclave is diluted with water,
distilled to drive off the excess of chloride and to extract the alcohol; then there is
added the amount of hydrochloric acid necessary to form the salt of anisoline, after
which it is precipitated by sea salt.
The anisoline is dissolved in pure water and left to crystallize or precipitated by
sea salt.
Generally the iodides and bromides being little soluble crystallize; the more
soluble chlorides are dried after precipitation and are in the form of greenish
spangles of metallic appearance very soluble in water.
Under the same conditions, alcoholic chlorides, bromides and iodides, simple or
compound are capable of reacting not only on the condensation products of phtalic
acid with the alkylized amido-phenols or ainido-cresols, but also on those in which
the phtalic acid is replaced by succinic, suberic &e. acids to produce equally new
coloring matters or dyes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is

page_text: 1. The-method-or-process-of-obtaining new coloring matters or dres, hereinbefore
enlled Anisolines" by substituting-for-the-metal-of-rhodamine-sults a simple
#lechotie-radical-such-as-methyle, ethyle-or-amyle-or-a-compound-nleoholic-radient
such-as-benzyle-ns-hereinbefore-described.
2. The carrying-out-of-the-method-or-process-referred-to-in-Claim 1 by the action
of a simple or compound alcoholic chloride, bromide or iodide-on-a-rhodamine-sult, for
example-a potassium rhodamine-salt-in-presence-of-ethylie-aleshel,-the-whole-being
heated under pressure for several-hours at-n-temperature-exceeding 100°.Centigrade:
the product of the reaction-being-diluted with water, then-distilled-to-separate the
alcohol-and-drive-off the excess-chloride-of ethyle, the hot solution-having-ndded-to
it-hydrochlorie-neid whereby hydroelerate-of-anisoline is formed which is precipitated
by-sen-salt-all-as-herein before-set-forth.
As new products, the coloring matters or dyes hereinbefore called "Anisolines"
obtained substantially in the manner set forth.
Dated this Oth day of March 1899
J. C. MEWBURN,
55 and 56, Chancery Lane, London, Chartered Patent Agent.
J. C. MEWBURN,
55 and 56, Chancery Lane, London, Chartered Patent Agent.