IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0277056
(2008-11-24)
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등록번호 |
US-8278231
(2012-10-02)
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발명자
/ 주소 |
- Chun, Changmin
- Hershkowitz, Frank
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출원인 / 주소 |
- ExxonMobil Chemical Patents Inc.
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인용정보 |
피인용 횟수 :
8 인용 특허 :
32 |
초록
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In one aspect, the invention includes a heat stable, formed ceramic component that includes a multimodal grain distribution including (i) at least 50 wt % of coarse grains including stabilized zirconia, the coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the to
In one aspect, the invention includes a heat stable, formed ceramic component that includes a multimodal grain distribution including (i) at least 50 wt % of coarse grains including stabilized zirconia, the coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the total weight of the component; and (ii) at least 1 wt % of fine grains comprising a D50 average grain size not greater than one-fourth the D50 grain size of the coarse grain, dispersed within the coarse grains, based upon the total weight of the component; wherein after sintering, the component has porosity at ambient temperature in the range of from 5 to 45 vol. %, based on the formed volume of the component. In other embodiments, the invention includes a process for the manufacture of a hydrocarbon pyrolysis product from a hydrocarbon feed using a regenerative pyrolysis reactor system, comprising the steps of: (a) heating a pyrolysis reactor comprising a bi-modal stabilized zirconia ceramic component to a temperature of at least 1500° C. to create a heated reactive region, wherein after exposing the component to a temperature of at least 1500° C. for two hours the component has a bulk porosity measured at ambient temperature in the range of from 5 to 45 vol. %, based on the bulk volume of the component; (b) feeding a hydrocarbon feed to the heated pyrolysis reactor to pyrolyze the hydrocarbon feed and create a pyrolyzed hydrocarbon feed; and (c) quenching the pyrolyzed hydrocarbon feed to produce the hydrocarbon pyrolysis product.
대표청구항
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1. A heat stable, formed ceramic component, said component comprising: a multimodal grain distribution including:(i) at least 50 wt % of coarse grains including partially stabilized zirconia, said coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the total weight
1. A heat stable, formed ceramic component, said component comprising: a multimodal grain distribution including:(i) at least 50 wt % of coarse grains including partially stabilized zirconia, said coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the total weight of said component wherein said partially stabilized zirconia comprises 1 mole % to 7 mole % yttria per mole of partially stabilized zirconia; and(ii) at least 1 wt % of fine grains comprising a D50 average grain size not greater than one-fourth the D50 grain size of said coarse grain, dispersed within said coarse grains, based upon the total weight of said component; wherein (a) after sintering, said component has porosity at ambient temperature in the range of from 5 to 45 vol. %, based on the volume of said formed component, (b) wherein said fine grains have a grain mode comprises a D50 grain size of from 0.05 μm to 5.0 μm, and said grains have a grain mode comprises a D50 grain size of from 20 μm to 200 μm, and (c) wherein said fine grains consist essentially of a stabilizer or a stabilized zirconia. 2. The component of claim 1, wherein said fine grains consist essentially of yttria. 3. The component of claim 1, wherein said formed ceramic component was sintered at a temperature of at least 1500° C. 4. The component of claim 1, wherein said formed ceramic component comprises a flexural strength (MOR) of at least 6 kpsi and a normalized thermal shock resistance rating of at least four. 5. The component of claim 1, wherein said (MOR) flexural strength is at least 10 kpsi. 6. The component of claim 1, wherein said normalized thermal shock resistance rating is at least four. 7. The component of claim 1, wherein said fine grain mode comprises a D50 grain size of from 0.01 μm to 100 μm. 8. The component of claim 1, wherein said fine grain mode includes a D50 grain size of 0.05 μm to 44 μm. 9. The component of claim 1, wherein said fine grain mode includes a D50 grain size that is not greater than one-eighth the size of a D50 average grain size of said coarse grain mode. 10. The component of claim 1 wherein said bimodal distribution of grains comprises from 1 to 20 wt % of said fine grains and from 80 to 99 wt % of said coarse grains. 11. The component of claim 1 wherein said bimodal distribution of grains comprises from 1 to 15 wt % of said fine grains and from 85 to 99 wt % of said coarse grains. 12. The component of claim 3 wherein after annealing said sintered component at a temperature of at least 1800° C. for two hours said component includes porosity at ambient temperature in the range of from 5 to 45 vol % based upon the volume of said component, a MOR of at least 6 kpsi, and a normalized thermal shock resistance rating of at least four. 13. The component of claim 1 wherein said porosity is in the range of from 10 to 30 vol % based on the volume of said formed component. 14. The component of claim 1, wherein the shape of at least a majority by weight of said coarse grains have a shape factor of not greater than 2.5. 15. The component of claim 1, wherein the shape of at least a majority by weight of said fine grains have a shape factor of not greater than 2.5. 16. The component of claim 1, wherein said multimodal grain distribution further comprises; (iii) at least 5 wt % of an intermediate grain mode of stabilized zirconia including a D50 grain size intermediate the D50 grain size of each of said coarse grain mode and said fine grain mode, based upon the total weight of said component.
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