Title:
RECOVERY OF USED FRYING OILS
Document Type and Number:
WIPO Patent Application WO/1999/064545
Kind Code:
A2
Abstract:
Treatment and recovery of used frying oils uses combinations of adsorbents and antioxidants which provide unexpected improvements in used frying oil adsorptive and other properties, quality and service life such that the recovered frying oil can be reused. Used frying oil can be treated with a ternary mixture of adsorbents comprising calcium silicate, magnesium silicate and at least one of a porous rhyolitic material and silicon dioxide in effective amounts to unexpectedly and significantly reduce free fatty acids of the treated used frying oil as well as improve total polar component, oil stability and color thereof. Combinations of antioxidants can be included in the mixture in effective amounts to provide unexpected, significant improvements in oil stability and service life of the treated used frying oil.
Inventors:
AKOH CASIMIR C
REYNOLDS AARON ESTES JR
Application Number:
PCT/US1999/012360
Publication Date:
December 16, 1999
Filing Date:
June 03, 1999
Assignee:
UNIV GEORGIA RES FOUND (US)
International Classes:
B01D15/00; C11B13/00; B01J20/10; C11B3/10; (IPC1-7): C11B/
Foreign References:
| US4112129A | 1978-09-05 | | | |
| US5597600A | 1997-01-28 | | | |
| US4735815A | 1988-04-05 | | | |
| US4349451A | 1982-09-14 | | | |
| US5348755A | 1994-09-20 | | | |
| US4968518A | 1990-11-06 | | | |
Other References:
YATES R A ET AL: "REGENERATION OF OILS USED FOR DEEP FRYING: A COMPARISON OF ACTIVE FILTER AIDS" JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY, vol. 70, no. 5, 1 May 1993 (1993-05-01), pages 507-511, XP000372586 ISSN: 0003-021X
PATENT ABSTRACTS OF JAPAN vol. 018, no. 114 (C-1171), 24 February 1994 (1994-02-24) & JP 05 308911 A (YUKIO MURAI), 22 November 1993 (1993-11-22)
Attorney, Agent or Firm:
Timmer, Edward J. (MI, US)
Claims:
CLAIMS WE CLAIM
| 1. |
A method of treating used frying oil for reuse, comprising contacting the used frying oil with treating agent means comprising calcium silicate, magnesium silicate and at least one of porous rhyolitic material and silicon dioxide in amounts effective to significantly reduce free fatty acids oil and substantially improve oil stability of the treated, used frying oil. |
| 2. |
The method of claim 1 wherein free fatty acids of said frying oil are reduced by at least 90%. |
| 3. |
The method of claim 2 wherein free fatty acids are reduced to a level comparable to that of fresh frying oil. |
| 4. |
The method of claim 1 wherein said porous rhyolitic material includes food compatible acid species. |
| 5. |
The method of claim 1 wherein said silicon dioxide includes hydroxyl species. |
| 6. |
The method of claim 1 wherein said treating agent means comprises a mixture of calcium silicate, magnesium silicate and at least one of porous rhyolitic material and silicon dioxide. |
| 7. |
The method of claim 1 wherein said treating agent means comprises, in weight percent of the oil treated, about 1 to about <BR> <BR> <BR> 3 weight % calcium silicate, about 1 to about 3 weight % magnesium silicate and about 1 to about 3 weight % porous rhyolitic material. |
| 8. |
The method of claim 1 wherein said treating agent means comprises, in weight percent of the oil treated, about 1 to about 3 weight % calcium silicate, about 1 to about 3 weight % magnesium silicate, and about 1 to about 3 weight % silicon dioxide. |
| 9. |
The method of claim 1 wherein said treating agent means further includes an antioxidant. |
| 10. |
The method of claim 9 wherein at least two antioxidants are present comprising butylated hydroxytoulene and propyl gallate to improve the service life of said treated used frying oil. |
| 11. |
A method of treating used frying oil for reuse, comprising contacting the used frying oil with treating agent means comprising calcium silicate and magnesium silicate and at least two antioxidants in effective proportions to substantially reduce free fatty acids and substantially improve oil stability of the treated used frying oil. |
| 12. |
The method of claim 11 wherein free fatty acids of said frying oil are reduced by at least 90% and said oil stability is improved by at least 48%. |
| 13. |
The method of claim 11 wherein said antioxidants comprise butylated hydroxytoulene and propyl gallate. |
| 14. |
The method of claim 11 wherein said treating agent means also includes at least one of porous rhyolitic material and silicon dioxide. |
| 15. |
A treating agent for use in recovering used frying oil, comprising calcium silicate, magnesium silicate and porous rhyolitic material. |
| 16. |
The agent of claim 15 comprising, in weight percent of the agent, about 25 to about 45 weight % calcium silicate, about 25 to about 45 weight % magnesium silicate and about 25 to about 45 weight a porous rhyolitic material. |
| 17. |
The agent of claim 15 wherein said porous rhyolitic material includes a food compatible acid species. |
| 18. |
A treating agent for use in recovering used frying oil, comprising calcium silicate, magnesium silicate and silicon dioxide. |
| 19. |
The agent of claim 18 comprising, in weight percent of the agent, about 25 to about 45 weight % calcium silicate, about 25 to about 45 weight % magnesium silicate, and about 25 to about 45 weight % silicon dioxide. |
| 20. |
The agent of claim 18 wherein said silicon dioxide includes hydroxyl species. |
Description:
INTERNATIONAL SEARCH REPORT Mf"'MonatAppHcattonNo PCT/US 99/12360 C. (Conlnuation) DOCUMENTS CONSIDERED TO BE RELEVANT Category Citation of document, with indication, wnere appropriate, of the relevant passages Relevant to daim No. A US 4 735 815 A (TAYLOR DENNIS R ET AL) 1-20 A US 4 735 815 A (TAYLOR DENNIS R ET AL) 1-20 5 April 1988 (1988-04-05) claims 1-4 A US 4 349 451 A (FRIEDMAN BERNARD) 1-20 14 September 1982 (1982-09-14) column 5, line 10-column 6, line 2; claims 1-10 A PATENT ABSTRACTS OF JAPAN 1-20 vol. 018, no. 114 (C-1171), 24 February 1994 (1994-02-24) &JP 05 308911 A (YUKIO MURAI), 22 November 1993 (1993-11-22) abstract A US 5 348 755 A (ROY GLENN M) 1-20 20 September 1994 (1994-09-20) column 11, line 1-56 column 12, line 6-43; claim 2 A US 4 968 518 A (LOPEZ MICHAEL) 9-13 6 November 1990 (1990-11-06) claims 1-11 1 r -national application No. INTERNATIONAL SEARCH REPORT PCT/US 99/12360 = atlon of Item 1 of first sheet) Box I Observations where certain claims were found unsearchable (Continuation of item 1 of flrst sheet) This International Search Report has not been established in respect of certain claims under Article 17 (2) (a) for the following reasons : 1. Claims Nos.: because they relate to subject matter not required to be searched by this Authority, namely: 2. nu Claims Nos.: because they relate to parts of the international Application that do not comply with the prescribed requirements to such an extent that no meaningful International Search can be carried out, specifically: 3. Claims Nos.: because they are dependent claims and are not drafted in accordance with the second and third sentences of Rule 6.4 (a). Box 11 Observations where unity of Invention Is lacking (Continuation of Item 2 of first sheet) This International Searching Authority found multiple inventions in this international application, as follows : see additional sheet 1.-1 As all required additional search fees were timely paid by the applicant. this International Search Report covers all searchabie claims. 2. FXI As all searchable claims could be searched without effort justifying an additional fee, this Authority did not invite payment of any additional fee. 3. n As only some of the required additional search fees were timely paid by the applicant, this International Search Report covers only those claims for which fees were paid, specifically claims Nos.: 4. No required additional search fees were timely paid by the applicant. Consequently, this International Search Report is restricted to the invention first mentioned in the claims ; it is covered by claims Nos.: Remark on Protest mj The additional search fees were accompanied by the applicant's protest. u No protest accompanied the payment of additional search fees. u Intemational Application No. PCTNS 99 A2360 FURTHER INFORMATION CONTINUED FROM PCT/ISA/210 This International Searching Authority found multiple (groups of) inventions in this international application, as follows: 1. Claims: 1-10,14-20 A method of treating used frying oil for reuse, comprising contacting the used frying oil with calcium silicate, magnesium silicate and one of porous rhyolite material and silicon dioxide 2. Claims : 11-13 A method of treating used frying oil for reuse, comprising contacting the used frying oil with calcium silicate, magnesium silicate and at least two antioxidants. INTERNATIONAL SEARCH REPORT lrite--tional Application No , oon on patent family members Patent document Publlcation Patent family Publication cited in search report date member (s) date US 4112129 A 05-09-1978 AT 366409 B 13-04-1982 AT 666578 A 15-08-1981 CA 1135559 A 16-11-1982 DE 2839809 A 19-04-1979 FR 2403297 A 13-04-1979 GB 2006729 A, B 10-05-1979 JP 1482612 C 27-02-1989 JP 54062999 A 21-05-1979 JP 63027288 B 02-06-1988 US 5597600 A 28-01-1997 AU 696228 B 03-09-1998 AU 5985796 A 24-12-1996 CA 2219670 A 12-12-1996 EP 0831712 A 01-04-1998 WO 9639044 A 12-12-1996 US 4735815 A 05-04-1988 US 4701438 A 20-10-1987 CA 1294600 A 21-01-1992 EP 0256631 A 24-02-1988 US 4349451 A 14-09-1982 US 4330564 A 18-05-1982 AU 557349 B 18-12-1986 AU 2797084 A 30-08-1984 AU 537786 B 12-07-1984 AU 6144580 A 26-02-1981 CA 1176098 A 16-10-1984 DE 3031746 A 26-03-1981 FR 2469128 A 22-05-1981 GB 2057004 A, B 25-03-1981 GB 2127035 A, B 04-04-1984 JP 56035950 A 08-04-1981 JP 05308911 A 22-11-1993 NONE US 5348755 A 20-09-1994 CA 2102312 A 05-09-1993 DE 69311778 D 31-07-1997 DE 69311778 T 12-02-1998 DK 592622 T 02-02-1998 EP 0592622 A 20-04-1994 ES 2107008 T 16-11-1997 HK 1000125 A 12-12-1997 JP 6510563 T 24-11-1994 WO 9317567 A 16-09-1993 US 4968518 A 06-11-1990 NONE
