Oct. 29,1946.. E. l.. LuAcEs 2,410,034 METHOD OF RECLAIMING SOILED SOLVENT BY DISTILLATION AND ADSORPTION Original Filed March l, 1943 ` n ATTORNEYS \ 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.