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Details for Patent: 7,718,698

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Details for Patent: 7,718,698

Title:Process for decreasing environmental pollutants in an oil or a fat
Abstract: The invention relates to a process for decreasing the amount of environmental pollutants in a mixture comprising a fat or an oil, being edible or for use in cosmetics, the fat or oil containing the environmental pollutants, which process comprises the steps of adding a volatile working fluid to the mixture, where the volatile working fluid comprises at least one of a fatty acid ester, a fatty acid amid, a free fatty acid and a hydro-carbon, and subjecting the mixture with the added volatile working fluid to at least one stripping processing step, in which an amount of environmental pollutant present in the fat or oil, being edible or for use in cosmetics, is separated from the mixture together with the volatile working fluid. The present invention also relates to a volatile environmental pollutants decreasing working fluid, for use in decreasing an amount of environmental pollutants present in a fat or oil, being edible or for use in cosmetics. In addition, the present invention relates to a health supplement, a pharmaceutical and an animal feed product prepared according to the process mentioned above.
Inventor(s): Breivik; Harald (Porsgrunn, NO), Thorstad; Olav (Porsgrunn, NO)
Assignee: Pronova Biopharma Norge AS (Baerum, NO)
Filing Date:May 01, 2008
Application Number:12/113,356
Claims:1. A process for decreasing the amount of environmental pollutants in a mixture comprising a fat or an oil, wherein said mixture comprises a pharmaceutical composition, said process comprising the steps: (a) adding a volatile working fluid to the fat or oil mixture, wherein the volatile working fluid comprises at least one fluid chosen from fatty acid esters, fatty acid amides, and hydrocarbons, and (b) subjecting the mixture of step (a) to at least one stripping processing step, wherein an amount of said environmental pollutants is separated from the mixture together with the volatile working fluid; and wherein said pharmaceutical composition is not a health supplement.

2. The process according to claim 1, wherein the volatile working fluid with the environmental pollutants is derived to a condenser.

3. The process according to claim 1, wherein the volatile working fluid is equally or less volatile than the environmental pollutants that are to be separated from the fat or oil mixture.

4. The process according claim 1, wherein the at least one fluid chosen from fatty acid esters, fatty acid amides, and free fatty acids is obtained from at least one source chosen from a vegetable fat, a vegetable oil, a microbial fat, a microbial oil, an animal fat, an animal oil, and a bio-diesel.

5. The process according to claim 4, wherein the at least one of an animal fat and animal oil is chosen from a fish oil and an oil obtained from sea mammals.

6. The process according to claim 1, wherein the volatile working fluid comprises at least one fatty acid ester comprising C.sub.10-C.sub.22 fatty acids and C.sub.1-C.sub.4 alcohols, or a combination of at least two fatty acid esters, each comprising C.sub.10-C.sub.22 fatty acids and C.sub.1-C.sub.4 alcohols.

7. The process according to claim 1, wherein the fat or oil is obtained from at least one chosen from a vegetable fat, a vegetable oil, a microbial fat, a microbial oil, an animal fat, and an animal oil.

8. The process according to claim 7, wherein the fat or oil is a marine oil.

9. The process according to claim 8, wherein the marine oil is obtained from at least one of fish and sea mammals, and wherein said marine oil comprises at least one fatty acid chosen from saturated and unsaturated fatty acids in the form of triglycerides.

10. The process according to claim 8, wherein the content of brominated flame retardants in the marine oil as measured by the concentration of BDE 47 is reduced to less than 5.3 .mu.g/kg.

11. The process according to claim 10, wherein the content of brominated flame retardants in the marine oil as measured by the concentration of BDE 47 is reduced to less than 0.2 .mu.g/kg.

12. The process according to claim 8, wherein the content of dioxin-like polychlorinated biphenyls in the marine oil as measured by the concentration of TE-PCB is reduced to less than 22.6 pg/g (TE/WHO).

13. The process according to claim 8, wherein the content of dioxins in the marine oil as measured by the concentration of the total of PCDD and PCDF is reduced to less than 4.65 pg/g (TE/WHO).

14. The process according to claim 1, wherein the ratio of volatile working fluid to the fat or oil ranges from 1:100 to 15:100.

15. The process according to claim 14, wherein the ratio of volatile working fluid to the fat or oil ranges from 3:100 to 8:100.

16. The process according to claim 1, wherein the at least one stripping processing step is carried out at a temperature ranging from 120.degree. C. to 270.degree. C.

17. The process according to claim 16, wherein the at least one stripping processing step is carried out at a temperature ranging from 150.degree. C. to 200.degree. C.

18. The process according to claim 1, wherein the at least one stripping processing step is carried out at a pressure less than 1 mbar.

19. The process according to claim 1, wherein said at least one stripping processing step is chosen from short path distillation, short path evaporation, thin-film distillation, thin-film evaporation, falling-film distillation, falling-film evaporation, and molecular distillation.

20. The process according to claim 19, wherein the at least one stripping processing step is thin-film evaporation carried out at a mixture flow rate ranging from 10 kg/hm.sup.2 to 300 kg/hm.sup.2.

21. The process according to claim 9, further comprising the step of concentrating the marine oil.
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