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Oct. 29,1946..
E. l.. LuAcEs
2,410,034
METHOD OF RECLAIMING SOILED SOLVENT BY DISTILLATION AND ADSORPTION
Original Filed March l, 1943
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ATTORNEYS
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Patented Óct. 29, 1946
2,410,034
UNITED STATES PATENT oFElcE
2,410,034
METHOD OF RECLAIMING SOILED SOLVENT
BY DISTILLATION AND ADSORPTION`
Enrique L. Luàces, Dayton, Ohio, assignor to
Chemical Developments Corporation, Dayton,
Ohio, a corporation of Ohio
Original application March 1, 1943, Serial No.
477,683. Divided and this application October
16, 1943, Serial No. 506,502
^
3 Claims.
l
Thi-s invention deals with a method of reclaim
ing soiled solvent, and this application is a di
vision of application Serial No. 477,683, i'lled
March l, 1943.
In particular, this invention deals with a meth
od of reclaiming solvents soiled with coloring
matter and containing substantially 20 to 50% of
hydrocarbons and the remainder consisting of
ketones, esters and alcohols, any of the latter
2
without departing from the spirit of this disclo
sure and the scope of the appended claims.
I claim:
1. The method of reclaiming soiled solvent con
taining water-insoluble coloring matter and said
solvent consisting of 20 to 50% hydrocarbons and
the balance being selected from the group con
sisting of ketones, esters, alcohols, and mixtures
thereof, said method consisting in adding to the
compounds alone or a mixture thereof. Such 10 mixture of solvents a quantity of water whereby
solvents, for example, are obtained in de-inking
separation into two layers is brought about, the
Cellophane waste material by extraction, as it is
top layer containing the coloring matter and the
described in the above-mentioned parent ap
bottom layer containing the added water, sepa
plication.
rating the top layer and the Ibottom layer, adding
According to the instant invention, solvents of 15 to the top layer active carbon, agitating the mix
the described composition are reclaimed by add
ture of active carbon and top layer material,
ing water and purifying the aqueous fraction
removing the active car-bon therefrom to obtain
formed, after separation, by distillation and the
top layer material free from coloring matter, and
non-aqueous fraction by adsorption with active
de-watering the bottom layer by distillation to
carbon.
>
20 obtain bottom layer material free from water.
In the following, the method of my invention
2. The method of reclaiming solvent consisting
will be described in detail.
of 25% 'benzol, 75% acetone and soiled by water
_Most of the dyes or colors used in printing
insoluble coloring matter, said method consisting
Cellophane are insoluble in water. The solvents
in adding to the mixture of solvents a quantity
used for de-inking may thus be reclaimed for fur 25 of water whereby separation into two layers is
ther use by the following procedure:
broughtl about, the top layer containing the col
A quantity of water equal to from 50 to 100%
oring matter and practically al1 of the benzol and
of the volume of the soiled solvent is added there
the ybottom layer containing the added water and
to and the mixture slowly agitated. The insolu
practically all of the acetone, separating the top
ble (hydrocarbon) portion of the solvent quickly 30 layer and the bottom layer, adding to the top
separates from the water miscible (non-hydro
layer active carbon, agitating the mixture of
carbon) portion thereof. 'I'he ink colors are gath
active carbon and top layer material, removing
ered into the supernatant layer of in-soluble or
the active carbon therefrom to obtain benzol free
immiscible solvent while the water added collects
from coloring matter, and de-watering the bot
in the bottom layer. If severe agitation is avoided 35 tom layer by distillation to obtain water-free
the separation of the two layers will be sharp
acetone.
and no emulsiñcation will appear.
3. The method of reclaiming soiled solvent
.The top and bottom layers are separated. The
containing water-insoluble coloring matter and
former is mixed with a small quantity of active
said solvent consisting of 20 to 50% hydrocar
carbon (0.5 to 3% by weight) and after thorough
bons and the balance being selected from the
agitation for approximately 10 to 20 minutes at
group consisting of ketones, esters, alcohols, and
room temperature may be separated from the
mixtures thereof, said method consisting in add
carbon by filtration or otherwise perfectly clear
ing to the mixture of solvents a quantity of Water .
and free of color. The bottom layer, in turn, is
whereby separation into two layers is brought
de-watered by distillation. All solvents are thus 45 about, the top layer containing the coloring mat
recovered for re-use with only slight handling
ter and the bottom layer containing the added .
losses.
water, separating the top layer and the bottom
It will be understood that While there have
layer, adding to the top layer from 0.5 to 3% by
been described herein and illustrated in the draw
weight of active carbon, agitating‘the mixture
ing certain preferred embodiments of this inven 50 of active carbon and top layer material, removing
tion, it is not intended thereby to have this in
the active carbon therefrom to obtain top layer
vention limited to or circumscribed by the specific
material free from coloring matter, and de-water
'ing the bottom layer by distillation to obtain
details herein described in view of the fact that
bottom layer material free from water.
the invention is susceptible to modifications de
pending on individual conditions and preference 55
ENRIQUE L. LUÀCES.
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