Claims
- 1. A process for preparing a high quality olefin product comprising catalytically isomerizing a stream comprising an olefin feedstock, said process comprising contacting said stream comprising an olefin feedstock with an activated catalyst under first conditions comprising a first temperature in the range of from about -50.degree. C. to about 200.degree. C. and at a pressure in the range of from about 0 to about 100 psig, said first conditions being effective to isomerize olefins in said feedstock:
- wherein said stream further comprises one or more reactive impurities at a concentration in the range of from about 1 to about 10,000 wppm, wherein said activated catalyst is prepared by a method comprising:
- providing a dried support material, wherein said dry support material is prepared from a first pseudoboehmite alumina having an average crystallite size substantially the same as a catapal grade pseudoboehmite or a second pseudoboehmite having an average crystallite size smaller than a catapal pseudoboehmite;
- thermally mixing a metallic alkali metal and said dried support material under second conditions effective to produce a catalyst precursor mixture comprising a substantially uniform dispersion of said alkali metal on said support; and,
- activating said catalyst precursor mixture by treatment with an oxygen-containing gas to produce said activated catalyst having an activity rate constant greater than about 50.
- 2. A process in accordance with claim 1, wherein said reactive impurities are selected from the group consisting of mono olefins, acidic oxygenates, and diene impurities.
- 3. A process in accordance with claim 2, wherein said diene impurities are selected from the group consisting of cyclopentadiene, cyclooctadiene, tetraahydroindene, vinylnorbornadiene, ethynylnorborene, hydroperoxides, vinylcyclohexenes, and methyl vinylcyclohexenes.
- 4. A process in accordance with claim 1, wherein said olefin feedstock is an alkenyl bridged compound.
- 5. A process in accordance with claim 4, wherein said alkenyl bridged ring compound is 5-vinyl-2-norbornene.
- 6. A process in accordance with claim 5, wherein said olefin product is 5-ethylidene-2-norborene.
- 7. A process in accordance with claim 1 wherein said first temperature is in the range of from about 20.degree. to about 100.degree. C.
- 8. A process comprising contacting a stream comprising an alkenyl bridged ring compound and one or more reactive impurities with an activated catalyst under conditions comprising a temperature in the range of from about -50.degree. C. to about 200.degree. C. and a pressure in the range of from about 0 psig to about 100 psig, said conditions being effective to isomerize said alkenyl bridged ring compound, wherein said activated catalyst is prepared by:
- providing a dried support material consisting essentially of an alumina prepared from a starting material consisting essentially of a pseudoboehmite selected from the group consisting of a first pseudoboehmite having an average crystallite size substantially the same as a catapal grade pseudoboehmite and a second pseudoboehimite having an average a crystallite size smaller than a catapal grade pseudoboehmite, wherein said alumina has a surface area selected from the group consisting of in the range of from about 140 to about 180 m.sup.2 /g when prepared from said second pseudoboehmite and in the range of from about 230 to about 260 m.sup.2 /g when prepared from said first pseudoboehmite;
- thermally mixing a metallic alkali metal comprising sodium and said dried support material under second conditions effective to produce a catalyst precursor mixture comprising a substantially uniform dispersion of said alkali metal on said support; and
- activating said catalyst precursor mixture by treatment with an oxygen-containing gas;
- wherein said activated catalyst maintains a higher rate of activity during said isomerization than said catalyst maintains in the absence of said treatment with said oxygen-containing gas.
- 9. A process in accordance with claim 8, wherein said reactive impurities are selected from the group consisting of mono olefins, acidic oxygenates, and diene impurities.
- 10. A process in accordance with claim 9, wherein said diene impurities are selected from the group consisting of cyclopentadiene, cyclooctadiene, tetraahydroindene, vinylnorbornadiene, ethynylnorborene, hydroperoxides, vinylcyclo-hexenes, and methyl vinyl-cyclohexenes.
- 11. A process in accordance with claim 10, wherein said alkenyl bridged ring compound is 5-vinyl-2-norbornene.
- 12. A process for catalytically isomerizing a stream comprising a 5-vinyl-2-norbornene and one or more reactive impurities comprising contacting said stream with an activated catalyst under first conditions comprising a temperature in the range of from about -50.degree. C. to about 200.degree. C. and a pressure in the range of from about 0 to about 100 psig, wherein said first conditions are effective to isomerize said 5-vinyl-2-norbornene, wherein said activated catalyst is prepared by:
- providing a dried support material consisting essentially of an alumina prepared from a starting material consisting essentially of a pseudoboehmite selected from the group consisting of a first pseudoboehmite having an average crystallite size substantially the same as a catapal grade pseudoboehmite and a second pseudoboehimite having an average a crystallite size smaller than a catapal grade pseudoboehmite, wherein said alumina has a surface area selected from the group consisting of in the range of from about 140 to about 180 m.sup.2 /g when prepared from said second pseudoboehmite and in the range of from about 230 to about 260 m.sup.2 /g when prepared from said first pseudoboehmite;
- thermally mixing a metallic alkali metal comprising sodium and said dried support material to produce a catalyst precursor mixture comprising a substantially uniform dispersion of said alkali metal on said support; and
- activating said catalyst precursor mixture by treatment with an oxygen-containing gas under conditions effective to oxidize substantially all of said alkali metal;
- wherein said activated catalyst maintains a higher rate of activity during said isomerization than said catalyst maintains in the absence of said treatment with said oxygen-containing gas.
- 13. A process in accordance with claim 1, wherein the activity rate constant is greater than 100.
- 14. A process in accordance with claim 13, wherein the activity rate constant is greater than 150.
- 15. The process of claim 1 wherein said dried support material consists essentially of an alumina prepared from a starting material consisting essentially of a pseudoboehmite selected from the group consisting of a first pseudoboehmite having an average crystallite size substantially the same as a catapal grade pseudoboehmite and a second pseudoboehmite having an average a crystallite size smaller than a catapal grade pseudoboehmite, wherein said alumina has a surface area selected from the group consisting of in the range of from about 140 to about 180 m.sup.2 /g when prepared from said second pseudoboehmite and in the range of from about 230 to about 260 m.sup.2 /g when prepared from said first pseudoboehmite.
- 16. The process of claim 1 wherein said alkali metal comprises sodium.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/258,358, filed on Jun. 10, 1994, now abandoned, which is a continuation of application Ser. No. 08/014,954, filed on Feb. 8, 1993, now abandoned, which is a divisional of application Ser. No. 07/775,776, now abandoned, filed on Oct. 11, 1991, which is a continuation-in-part of application Ser. No. 07/700,016 filed on May 14, 1991, now abandoned, all of which are incorporated by reference in their entirety herein for purposes of U.S. practice.
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258358 |
Jun 1994 |
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700016 |
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