Organic compounds -- part of the class 532-570 series – Organic compounds – Fatty compounds having an acid moiety which contains the...
Patent
1997-10-27
1999-08-17
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Fatty compounds having an acid moiety which contains the...
554 11, 554 9, 426 17, 426 29, C11B 106, C12J 110, A23L 120
Patent
active
059395710
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is concerned with a device, namely a screw press, for the production of oils by pressing and extracting an oleiferous raw material in the presence of a liquid extraction agent. The device includes an inlet for the raw material, a substantially cylindrical pressing body having outlets for oil and being connected to the inlet, and a press screw movably provided in the cylindrical pressing body. The press srew transports the raw material from the inlet into the pressing body and therefrom to a discharge outlet while pressing it.
For the purposes of the present specification and claims, the terms "oil" and "oleiferous" also refer to "fat" and "fatty" as well as to "extractable substances".
2. Description of Related Art
From DE-A-30 16 877, a process for the continuous separation of fat from organic raw materials is known wherein the raw materials are first shredded and optionally dried, then mashed using a fat dissolving agent and thereafter fed to a screw press.
Also, GB-A-1 340 484 is concerned with pressing in the presence of an extraction agent.
DE-C 665 873 refers to a process according to which an extraction agent is fed during pressing.
According to the process known from GB-A-1 340 484, palm oil may be produced by pressing the oleiferous fruit while adding a solvent to the material to be pressed under normal pressure at the intake of the press.
All known screw presses whereby oil is produced have the disadvantage in that their oil yields are not satisfactory.
Thus it is the object of the present invention to provide a screw press whereby the oleiferous raw material may be deoiled to an extent of 96-98%, based on the total oil content, in one single operation step.
BRIEF SUMMARY OF THE INVENTION
The device according to the invention for the present production of oil by pressing and extracting an oleiferous raw material in the presence of a liquid extraction agent, comprises an inlet for the raw material, a substantially cylindrical pressing body having outlets for oil and being connected to the inlet, and a press screw movably provided in the cylindrical pressing body. The press screw transports the raw material from the inlet into the pressing body and therefrom to a discharge outlet while pressing it wherein a jacket and liquid extraction agent may be introduced under pressure into the raw material present present invention consists essentially of the jacket comprising at its lower.
A convenient embodiment of the device according to the present invention consists essentially of the jacket comprising at its lower portion a tub for collecting the oil/extraction agent mixture being discharged from the pressing body.
The tub is suitably provided with an outlet for the oil/extraction agent mixture, said outlet having a gasproof connection to a pressure vessel.
The invention is also concerned with a process for the production of oils and/or extractable substances by pressing and extracting oleiferous and/or extractable substances-containing raw material in the presence of a liquid and/or a supercritical extraction agent, an oil or extracted substance/extraction agent mixture being obtained wherefrom the extraction agent is removed, wherein the raw material is shredded and pressed using the above-described device according to the invention while the extraction agent is simultaneously introduced under pressure into the raw material.
Using the device according to the invention, carbon dioxide in liquefied state and/or supercritical state and/or hydrocarbons in liquid and/or supercritical state are particularly useful as the liquid extraction agent.
It has proven advantageous to treat the shredded raw material with an oil-dissolving liquid prior to pressing. Thus the oil layer surrounding the shredded raw material particles is removed, whereby friction between the particles during pressing is increased and a very good build-up of pressure in the pressing body as well as a very good sealing of the pressing body towards its upstream end are a
REFERENCES:
patent: 2184248 (1939-12-01), Bonotto
patent: 4024168 (1977-05-01), Homann et al.
patent: 4675133 (1987-06-01), Eggers et al.
patent: 5041245 (1991-08-01), Benado
patent: 5077071 (1991-12-01), Strop
Killos Paul J.
Parsa J.
Sucher & Holzer Bauplanungs --und
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