IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0790903
(2013-03-08)
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등록번호 |
US-8765660
(2014-07-01)
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발명자
/ 주소 |
- Li, Kunhao
- Speronello, Barry
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
156 |
초록
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Methods for removing surfactants from polar solids are described herein. In particular, various embodiments described herein relate to the removal of surfactants from polar solids that involves contacting a surfactant-containing porous polar solid with an extraction agent comprising water, a salt, a
Methods for removing surfactants from polar solids are described herein. In particular, various embodiments described herein relate to the removal of surfactants from polar solids that involves contacting a surfactant-containing porous polar solid with an extraction agent comprising water, a salt, and, optionally, a polar organic compound. In certain embodiments described herein, the extraction agents are used to remove surfactants from a mesoporous zeolite.
대표청구항
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1. A method for removing a surfactant from a polar solid, said method comprising: contacting a surfactant-containing porous polar solid with an initial extraction agent under conditions sufficient to remove at least a portion of a surfactant from the pores of said surfactant-containing polar solid,
1. A method for removing a surfactant from a polar solid, said method comprising: contacting a surfactant-containing porous polar solid with an initial extraction agent under conditions sufficient to remove at least a portion of a surfactant from the pores of said surfactant-containing polar solid, wherein said initial extraction agent comprises water and a salt, wherein said initial extraction agent comprises a polar organic compound that is capable of at least partially solubilizing the surfactant, wherein said polar organic compound is selected from the group consisting of THF, one or more alcohols, one or more pyridines, one or more ketones, one or more aldehydes, one or more amides, and combinations thereof,wherein said salt is selected from the group consisting of NaCl, NaNO3, Na2SO4, (NH4)2SO4, MgSO4, Mg(NO3)2, CaCl2, Ca(NO3)2, La(NO)3, Ce(NO3)4, LaCl3, CeCl4, AlCl3, Al2(SO4)3, and mixtures thereof. 2. The method of claim 1 wherein said surfactant-containing polar solid comprises a molecular sieve having cation exchange capacity. 3. The method of claim 1 wherein said surfactant-containing polar solid is selected from the group consisting of aluminates, silicates, zeolites, and combinations thereof. 4. The method of claim 1 wherein said surfactant-containing polar solid comprises a zeolite. 5. The method of claim 1 wherein said polar organic compound is selected from the group consisting of acetone, ethanol, methanol, isoproponal, THF, pyridine, ethyl acetate, DMF, and combinations thereof. 6. The method of claim 1 wherein said initial extraction agent comprises at least 5 percent by weight of said polar organic compound. 7. The method of claim 1 wherein said initial extraction agent is in the form of an azeotrope. 8. The method of claim 1 wherein said surfactant comprises a cationic surfactant. 9. The method of claim 1 wherein at least 20 weight percent of said surfactant associated with said surfactant-containing polar solid is present within the pores of said surfactant-containing polar solid. 10. The method of claim 1 wherein said method removes at least 15 percent by weight of said surfactant initially contained in the pores of said surfactant-containing polar solid. 11. The method of claim 1 wherein said contacting occurs at a pH of at least 7. 12. The method of claim 1 wherein said contacting occurs in the absence of an added acid. 13. The method of claim 1 wherein said contacting forms a treated polar solid and a surfactant-containing extraction agent, wherein said method further comprises separating said treated polar solid from said surfactant-containing extraction agent to thereby provide a recovered polar solid and a spent extraction agent. 14. The method of claim 13 wherein said recovered polar solid has a crystalline content that is at least 30 percent of the crystalline content of said surfactant-containing polar solid as measured by X-ray diffraction (“XRD”); wherein said recovered polar solid has a total 20 to 80 Å diameter mesopore volume that is not more than 0.015 cc/g less than the 20 to 80 Å diameter mesopore volume of said surfactant-containing polar solid. 15. The method of claim 13 wherein the weight ratio of the amount of said surfactant present in the pores of said recovered polar solid to the amount of said surfactant present in the pores of said surfactant-containing polar solid is not more than 0.9:1. 16. The method of claim 13 wherein the weight ratio of the amount of said surfactant present in the pores of said recovered polar solid to the amount of said surfactant present in the pores of said surfactant-containing polar solid is not more than 0.6:1. 17. The method of claim 1 wherein said contacting forms a surfactant-containing extraction agent comprising at least a portion of said water, at least a portion of said salt, and at least a portion of said surfactant initially present in the pores of said surfactant-containing polar solid. 18. The method of claim 17 wherein the ratio of the weight concentration of said salt in said surfactant-containing extraction agent to the weight concentration of said salt in said initial extraction agent is at least 0.25:1. 19. The method of claim 1 wherein said surfactant was previously used to form mesopores in said surfactant-containing polar solid. 20. The method of claim 1 wherein said surfactant-containing polar solid has a total 20 to 80 Å diameter mesopore volume of at least 0.05 cc/g. 21. A method for removing a surfactant from a mesoporous zeolite, said method comprising: (a) contacting a surfactant-containing mesoporous zeolite with an initial extraction agent under conditions sufficient to remove at least a portion of a cationic surfactant from the pores of said surfactant-containing mesoporous zeolite to thereby provide a treated mesoporous zeolite and a surfactant-containing extraction agent, wherein said initial extraction agent comprises water, a salt, and a polar organic compound, wherein said polar organic compound is capable of at least partially solubilizing said cationic surfactant, wherein said surfactant-containing extraction agent comprises at least a portion of said water, at least a portion of said salt, at least a portion of said polar organic compound, and at least a portion of said cationic surfactant initially present in the pores of said surfactant-containing mesoporous zeolite; and(b) separating said treated mesoporous zeolite from said surfactant-containing extraction agent to thereby provide a recovered mesoporous zeolite and a spent extraction agent, wherein the weight ratio of the amount of said cationic surfactant present in the pores of said recovered mesoporous zeolite to the amount of said cationic surfactant present in the pores of said surfactant-containing mesoporous zeolite is not more than 0.9:1. 22. The method of claim 21 wherein said polar organic compound comprises a polar organic solvent selected from the group consisting of acetone, ethanol, methanol, isoproponal, THF, pyridine, ethyl acetate, DMF, and combinations thereof. 23. The method of claim 21 wherein said salt is selected from the group consisting of potassium salts, ammonium salts, sodium salts, chloride salts, magnesium salts, bromide salts, aluminum salts, and combinations thereof. 24. The method of claim 21 wherein said recovered mesoporous zeolite has a total surfactant content of not more than 30 weight percent based on the total weight of said recovered mesoporous zeolite. 25. The method of claim 21 wherein said method removes at least 20 percent of said surfactant initially contained in the pores of said surfactant-containing mesoporous zeolite. 26. The method of claim 21 wherein said contacting occurs at a pH of at least 7. 27. The method of claim 21 wherein said surfactant-containing mesoporous zeolite is a mesostructured zeolite. 28. The method of claim 21 further comprising repeating said steps (a) and (b) with said recovered mesoporous zeolite as said surfactant-containing mesoporous zeolite. 29. The method of claim 21 wherein said separating of step (b) yields an extracted surfactant, further comprising recovering at least a portion of said extracted surfactant. 30. The method of claim 21 wherein said recovered mesoporous zeolite has a crystalline content that is at least 70 percent of the crystalline content of said surfactant-containing mesoporous zeolite as measured by X-ray diffraction (“XRD”); wherein said recovered mesoporous zeolite has a total 20 to 80 Å diameter mesopore volume that is not more than 0.01 cc/g less than the 20 to 80 Å diameter mesopore volume of said surfactant-containing mesoporous zeolite. 31. The method of claim 21 wherein the weight ratio of the amount of said surfactant present in the pores of said recovered mesoporous zeolite to the amount of said surfactant present in the pores of said surfactant-containing mesoporous zeolite is not more than 0.7:1. 32. The method of claim 21 wherein the ratio of the weight concentration of said salt in said surfactant-containing extraction agent to the weight concentration of said salt in said initial extraction agent is not more than 0.9:1.
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