US705034A - Process of extracting grease. - Google Patents

Description

No. 705,034. Patented July 22, I902.

D. CAMERON.

PROCESS OF EXTRAGTING GREASE.

(Application filed Feb. 10, 1902.)

(No Model.)

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A INITED STATES PATENT OFFICE.

DANIEL CAMERON, OF KANSAS CITY, MISSOURI, ASSIGNOR TO CUDAI-IY PACKING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PROCESS OF EXTRACTING GREASE.

SPECIFICATION forming part of Letters Patent No. 705,034,

Application filed February 10,1902.

To all 1072 0722, it may concern.-

Be itknown that LDANIEL CAMERON, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented a certain new and useful Improvement in Processes of Extracting Grease, (Case No. 2,) of which the following is a full, clear, concise, and exact description,reforence being had to the accompanying drawing, forming a part of this specification.

My invention relates to methods for treating grease or oil carrying products, and has for its object the provision of an improved method whereby it is possible to readily extract oil or grease from waste materials-for instance, hog or cattle products or any ordinary form of grease-carrying product which contains oil or grease.

I have found that it is advisable in extracting oils or greases from products containing the same to subdivide the same, after which pressure may be exerted upon the subdivided material to remove the oil or grease therefrom.

Myinvention contemplates in the preferred embodimentthereof an improved and greatlysimplified method whereby the subdivision of the product is simplified and aided, after which subdivision the material is brought within the influenceof a pressure apparatus or separator,in which suitable means are employed to agitate the contents thereof. the pressure has been sufficiently applied, which according to my improved method is preferably done through the agency of steam, oil which has collected in the apparatus may be Withdrawn and more thoroughly purified, if desired, after which the residue is removed into a drier, to which heat may be supplied and from which air may be exhausted to facilitate this drying process.

The apparatus used in carrying out my improved method provides a greatly-simplified rendering apparatus requiring very little attention and extracting the oil in a most thorough and ei'licient manner and at the same time reducing the waste material to a dry pulverized substance,all of which operations may be carried on without creating too-ofiensive odors.

After dated July 22,1 902.

Serial No. 98,421. (No specimens.)

I will describe an improved apparatus which may be employed in carrying out the method of my invention, in connection with the accompanying drawing, illustrating the preferred embodiment of said application.

The apparatus, as shown in the drawing, by means of which I carry out the method of my invention comprises a hopper 1, into which the products which are to be operated upon by the machine may be deposited. The materials when deposited in the hopper are subjected to heat, which is supplied thereto by a coil of steam-piping 2. This heating of the grease-carrying product aids the grinding process, to which, in accordance with my improved method, I subject the material before the same is treated in the pressure-chamber or separator. After a sufficient heating of the grease-carrying products within the hopper 1 a valve 3 may be opened to admit the same into a grinder 4 of any suitable construction, Within which the products are sub-- divided and passed therefrom by the chute 5 into the pressure-chamber or separator 6. A suitable manhole is provided in the upper portion of the separator 6, which is closed by a lid '7, suitable means-such,for instance, as

alocking-bar 8-being employed to retain the lid in place against the pressure which is exerted within the separator.

After the process of heating and grinding, to which the products have been subjected in their passage through the hopper 1 and the grinder at, the products are subjected to heat and pressure to have-the oils extracted therefrom in a most thorough and efficient manner. I extract the oil from the grease-carrying products deposited in the separator by subjecting them to a pressure, which is done through the agency of steam admitted to the interior of the separator by a coil of steampipe 9, to which steam may be supplied from any suitable source. The heat and pressure exerted upon the product extract the oil therefrom and allow the same to gather in the separator. The steam-pipe 9 is provided about five hours, the steam serving in the dual capacity of heating the material and at the same time subjecting the same to pressure, whereby the oils are most efficiently extracted from the product within the separator. In order to more thoroughly extract the oil, means are employed to agitate the contents, which means preferably consist of a centrallylocated rotary shaft 10, driven by means of a belt 11 in a suitable manner. The central shaft is provided with arms 12 12, secured thereto, which I arrange in spiral fashion about the said shaft, as well illustrated in the drawing, so that a most thorough agitation of the material is secured.

I am enabled to secure the extraction of the oil from the products in the separator at a much-reduced temperature and under more favorable conditions and in less space than by methods heretofore used, as said material is supplied to the separator in a finely-subdivided partly-heated condition, in which condition it is readily susceptible to the action of the steam under pressure as supplied to the separator.

The oil is carried away from the separator by means of eduction-tubes 13 13, which are all united with a common conveying-pipe 14:. The eduction-tubes 13 are placed in communication with the conveying-pipe 14 by valves 15 15, placed in said eduction tubes, so that either one of said eduction-tubes 13 may, as desired,con vey the oil or grease from the separator.

The advantage of eduction-tubes placed at different heights is that by this means oil can be drawn off without the necessity of admitting water to float the oil up to a single outlet. In the rendering process there is a certain amount of sediment in the separator. This is called tankage,and consists of refuse, which rests upon the bottom of the separator. Above this is the oil, the lighter and purer oil being at the top. The oil becomes heavier as the tankage is approached until finally just above the tankage there is a heavy black oil, which has to be subjected to retreatment for removing impurities. Heretofore the oil has been led out by means of an outlet, and as the amount of the tankage and the black oil in a charge varies it has been necessary to admit'water to raise the oil to the outlet, the outlet being high enough to be above the tankage and black oil in any case. The admission of the water served to agitate the contents, which prolonged the operation of settling. The water also had to be removed from the refuse by the final process of drying.

By means of the different outlets with their valves I am able to lead out the lighter and purer oil without disturbing or drawing the black oil or tankage, and I thus save time and trouble of admitting water and the agi tation of the contents resulting therefrom, and I also avoid the necessity of extracting the water again from the refuse after it is passed to the drier.

It is not necessary in carrying out the improved method of my invention to withdraw gases, steam, or volatile matter from the separator, but the oil therefrom may be withdrawn as it condenses by the eduction-tubes 18, the whole material being allowed to condense, if desired, within said separator 6.

The oils as withdrawn from the separator 6 may be deposited selectively in two tanks 16 and 17, one of which may serve as a receiver for the pure light oils as Withdrawn by means of the upper eduction-tubes 13 and the other of which may serve as a receptacle for the grease withdrawn from the separator by the lower eduction-tubes.

After substantially all of the oils or grease have been withdrawn from the product within the receiver 6 the residue is admitted into a drier 18 through a pipe 19, provided with a suitable valve 20.

The amount of material which may be acted upon at one time may be quite large, as the size of the separator may be almost anything desired, a separator which I have in practical operation and from which thedrawing in the present application has been prepared being sixteen feet in height.

The drier 18, which receives the residue from the separator 6, is suitably steam-jacketed, inlet and outlet tubes 21 22 for admit ting and withdrawing steam from the steamjacket being indicated. The steam-jacket, to which steam may be supplied at a suitable pressure, sixty pounds being a fair value, serves to dry the material.

In order to aid the drying action in the steam-jacket, I provide means for exhausting the air from the interior of the drier 18, which means consist of a suitable air or vacuum pump 23, united with the pipe 19 by a tube 24, having a valve 25 therein. The drying action may be carried on until the material is sufficiently dried, during which time the material in the drier is agitated by fan-blades 26 26, spirally arranged about a central rotatable shaft 27, driven in any suitable manner, as by a belt 28. The material, by virtue of the agitation to which it is subjected, is pulverized to a large degree and may be withdrawn from the separator through a manhole 29, provided with a lid 30, which is placed at the bottom of said drier.

In order to permit the gases to be blown off from the separator, I provide an exit-tube 32, having a valve 38, which may be led to some suitable condensing apparatus, if desired, as is well understood.

The great advantage of treating products by my improved method will be readily apparent to those skilled in the art. The prod ucts may be operated upon at a reduced tem perature and'under more favorable conditions than has hitherto been possible. The apparatus which is required to perform all of the operations upon the grease-carrying product is reduced to a minimum and greatly simplified and occupies less space.

The apparatus herein disclosed I have made the subject-matter of my application, No. 93,420, filed February 10, 1902.

While Ihaveherein shown and particularly described the preferred method of carrying out my invention, I do not wish to limit myself to the precise construction and arrangement of apparatus herein set forth; but,

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following:

'1. The herein-described method of extracting oil from oil-bearing products containing a substantial quantity of non-oleaginous material, which consists in heating said oil-bearing products, thereafter passing the same througha grinder, where they are subdivided, then passing the products into aseparator and subjecting them to heat and pressure, whereby the oils and grease are separated from the residue, withdrawing the lighter oil without adding water to the contents of the separator, and thereafter subjecting the residue to heat in a vacuum to dry the same, substantially as described.

2. The herein-described process of treating oil or grease carrying products containing a substantial quantity of non-oleaginous material, which consists in heating said products, then passing the same through a grinder to subdivide the same,thereafter subjecting said products to heat under pressure in a closed receptacle while agitating said products, thereby to separate the oil or grease from the residue, allowing the oil to rise and then Withdrawing the same without adding water to the product, and thereafter subjecting the residue to heat in a closed receptacle, thereby to dry the same, substantially as described.

In Witness whereof I hereunto subscribe my name this 5th day of February, A. Dr 1902.

DANIEL CAMERON.

Witnesses: v

CHARLES A. BROWN, HARVEY L. HANSON.

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